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Efficient engine designs that better utilize fuel than the conventional internal-combustion engine.


At PESWiki

  • Massive Yet Tiny (MYT) Engine - Internal combustion engine features multiple firings in one cycle to give 40 times higher power to weight ratio, low parts count, low maintenance, high mechanical efficiency, and low pollution.
  • Green Steam Engine - Advantages of invention by Robert Green (US 6647813) include: the ability to run on very low steam pressure and volume, inexpensive to build, few moving parts with low lubrication requirement, lightweight. Site includes instructions on how to build it.
  • Featured: Engines > J.I.M.S. >
    BB Motor Corp's Fuelless J.I.M.S Engine - BB Motor Corp claims to be launching a revolutionary new engine in 2012 that is claimed to produce huge amounts of power while consuming zero fuel and producing zero pollution. They are accepting inquiries regarding employment, marketing, dealerships, etc. Is this engine for real, or is it too good to be true? (PESN and BeforeItsNews; January 4, 2012)
    • Featured: Engines > J.I.M.S. >
      Overunity Details of J.I.M.S. Motor Reluctantly Revealed - BB Motor Corporation has reluctantly answered some questions about an exotic motor they have built that is claimed to be able to run without fuel and produce no pollution. A breakthrough energy technology may be about to emerge from the state of Texas. We wonder if there might be similarities to the Clem Engine. (PESN and BeforeItsNews; January 6, 2012)
  • Quasiturbine Engine - This four-chamber Wankel-like engine is capable of burning fuel using photo-detonation, an optimal combustion type. The design can also be used as an air motor, steam engine, gas compressor, hot air engine, or pump.
  • Top 100 / Featured: Engines > Wankel >
    Regi Technologies' RadMax rotary engine - The Radmax direct-charge engine with few moving parts is based on the Wankel rotary design, but is claimed to deliver up to three times the power, with half the weight of a true Wankel engine of the same size. It is virtually vibration free and very quiet. (PESWiki; Jan. 27, 2009)
  • Gun Engine - Canadian inventor, Kazimierz Holubowicz, has come up with an environmentally friendly and transmission-free engine based on the same mechanics as how a bullet is shot from a gun. Initial test results showed 92% efficiency.
  • W2 Energy Birthing Affordable, Renewable Petrol - Imagine a gasoline and diesel source that is CO2 neutral, sulfur-free, derived from renewable sources, superior in its power performance to fossil-based fuels, and costs less than 1/7 of fossil-based fuels. The company has also built an engine to optimize use of the syngas portion of the product.
  • Scuderi Split-Cycle Air Hybrid Engine - Claims potential to double fuel efficiency for same size engine, while reducing the manufacturing price by 50%. Because it is very similar to existing ICE technology, existing manufacturing infrastructure can be used for rapid deployment. Presently licensing to qualified manufacturing interests.
  • Libralato Ruggero's Atkinson-Cycle Rotary Engine - Rotary engine design by Italian inventor uses the Atkinson cycle to combine the best attributes of wankel rotaries and piston engines. Half the size of a conventional engine, it produces 30% more power and uses 10% less fuel.
  • Revetec cam-drive engine - The Revetec cam-drive engine uses a pair of counter-rotating scissor cams instead of a crankshaft. The result is three times more torque than a conventional engine, and an overall engine efficiency up to 50% more.
  • Crower's Six-Stroke Engine - Achieving a means of harnessing engine heat, Bruce Crower's internal combustion engine adds two strokes involving the injection of water, which immediately turns to steam, expanding the chamber for another cycle. Process keeps engine running cool.
  • Whirl Power Turbine - Using principles of a tornado or vortex, this patent pending engine is said to capture most of the energy in flowing gases and delivers power to a rotating shaft in proportion to the fuel input. This is a True Rotor Power utilizing centrifugal force as well as compression and velocity for various RPMs and torque output.
  • Six-Stroke Engine from India - Mechanical Engineering students of the college of Engineering in Trivandrum, India, have come up with an innovative six-stroke engine. The engine shows 40% reduction in fuel consumption and dramatic reduction in pollution. Its specific power is not less than that of a four-stroke petrol engine. The engine can run on almost any fuel, petrol and diesel to LPG.
  • RevoPower Reinvents the Wheel - Patented RevoPower wheel replaces regular bicycle wheel, to provide relatively quiet, powered riding with approximate economy of 200 mpg, going up to 20 mph, with low emissions.
  • Bourke Engine - continuous cycle is ~3x more efficient than standard 4-cycle engine now extant, with near 0 noxious emissions. Several companies nearing market-readiness with their products.
  • Traveling Wave Engine - The traveling-wave engine is a modern-day adaptation of the 19th century thermodynamic invention of Robert Stirling –– the Stirling engine –– which is similar to a steam engine, but uses heated air instead of steam to drive a piston.
  • Piston Driven Rotary Engine -Invented and Patented by Will Green is 14" Dia by 6" wide 200HP Fluid Driven motor, designed to be lightwieght and environmentaly friendly. This engine has a 7" crankshaft for increased leverage with 3 or 4 contiguous active 2" pistons for area acting on the creanshaft for high torque. Math shows this geometery to be over 1200% efficient. Will Green also worked on OX2 engine project for Advanced Engine Technologies, Inc.
  • Tesla Turbines - Bladeless Boundary Disc : Rather than using blades and friction, the Tesla Turbine uses parallel, closely spaced disks that tap viscosity. Aerodynamic skin adhesion effect resists fluid or gas flow between plates, resulting in energy transfer to the shaft. Technology works but is yet to break into marketplace.
  • Stirling Engines - Stirling engines convert any temperature differential directly to movement: they use a displacer piston to move enclosed air back and forth between cold and hot reservoirs. At the hot reservoir, the air expands and pushes a power piston, producing work and displacing the air to the cold reservoir. There the air contracts and pulls the power piston, closing the cycle.
  • Air Engine Generator - Kim Zorzi has designed and is ready to build a 100kw power system that runs on a multicylinder air type engine. A regenerative tank enables the system to repressurize itself. Fueled by ambient air temperature.
  • Engines >
    Perendev Nitrogen/Air Motor Video - Footage shows testing being done inside an EADS (European Aeronautic Defence and Space Company) lab. The motor, running on compressed air at just 3 bars, turns at 2900 rpm; allegedly designed to run at 10,000 rpms on 30 bars of pressure. A month ago, Perendev posted a new video showing an all-magnet motor, but not running. (PESWiki; June 29, 2009)

High-Efficiency Petrol Engines

  • Fuel Efficiency > Engines >
    The spherical genius of the Hüttlin Kugelmotor - After nearly twenty years of development the disc motor, a work of elegant genius of Dr. Herbert Hüttlin's Kugelmotor, is going through final testing. It is a compact spherical motor/generator combination that is radically different from the traditional in-line combustion engine, and has significantly fewer moving parts. (GizMag; September 22, 2011)
  • Fuel Efficiency > Engines > Super Fuel Efficient Vehicles >
    Next-Gen Mazda2 Will Return 70 MPG, Without An Electric Motor - The new version of the Mazda2 will feature Mazda's next-generation of drivetrain, body and chassis technologies, dubbed SKYACTIV. The new Mazda 2 will come powered by a SKYACTIV-G engine, Mazda's next-generation direct injection gasoline mill that achieves significantly improved fuel efficiency thanks to a high compression ratio of 14.0:1 (the world's highest for a production gasoline engine). (GreenCarReports; Oct. 21, 2010)
  • Vortex Technologies / Fuel Efficiency > Engines >
    New Jet Engine Design Offers 25% Fuel Efficiency Increase - A new engine developed by R-Jet is called an orbiting combustor-nozzle (OCN) jet. OCN jets rotate the airflow through the engine in a vortex, rather than passing the air straight through as conventional jet engines do. Swirling the incoming air into a vortex allows for a more complete mixing of fuel and air, leading to more efficient and complete combustion of the fuel. (EcoGeek; Oct. 7, 2010)
  • Fuel Efficiency > Engines >
    AVEC Axial Vector Engine (video) - Axial Vector Energy Corporation (AVEC) introduced a new, lightweight, heavy fuel-burning, partially ceramic, 30 HP unmanned aerial vehicle (UAV) engine at AUVSI Unmanned Systems 2010. In the Axial Vector Engine, the pistons reciprocate parallel (“axial”) to the output shaft. (EngineeringTV; Aug. 30, 2010)
  • Fuel Efficiency > Engines >
    Looking to Better Engines Instead of Electric Vehicles - Michigan-based engine developer startup EcoMotors International, which brought in $23 million in Series B financing this summer from Menlo Park, CA-based Khosla Ventures and Seattle billionaire Bill Gates, has designed an opposing piston, opposing cylinder (opoc) engine that uses fewer parts than traditional motors do and generates more power from each stroke of the engine. (XConomy; Nov. 1, 2010)
  • EcoMotors opoc™ engine design - The greater power density derived from this design provides a range of important attributes, including: lower weight, smaller size, lower material costs, lower friction, greater fuel efficiency, lower emissions, lower heat rejection. For a given power level, the opoc™ engine is 30-percent lighter, one-quarter the size, and achieves 50-percent better fuel economy compared with a state-of-the-art, conventional turbo-diesel engine. (Thanks Miroslav Karas)
  • Wauseon plant opened Monday for 110-mpg car engines - Doug Pelmear, who drove his 20-year-old Mustang from Napoleon, Ohio, to Las Vegas and back last year on 39 gallons of fuel, is opening his first manufacturing facility Monday to allow others to get 110 miles per gallon. Horse Power Inc. will begin manufacturing 20 engines per day. (Toledo Blade; May 30, 2009)
  • Fuel Efficiency > Retrofits / Engines >
    Dearth of financing stalls inventor of 110-mpg engine - A year ago, hundreds of people flocked to a 100,000-square-foot former factory building in Wauseon's industrial area where a Napoleon, Ohio, inventor promised to begin building engines that would travel more than 110 miles on a gallon of E85 gasoline. But time and the economy have not been kind to Doug Pelmear's plan to revolutionize the American automobile. (Toledo Blade; May 28, 2010)

Free-Piston Engines

  • High-Efficiency Generators for Hybrid Vehicles - An unconventional engine design is attracting attention as a potential alternative to hydrogen fuel cells or conventional engines in some hybrid vehicles. Called the free-piston engine, it could be used to generate electricity as efficiently as fuel cells yet cost less. (MIT Technology review; Sept. 30, 2008)

Multi-fuel Engines

  • Regi Technologies:RadMax rotary engine - Regi Technologies RadMax Compression Ignition Engine: Two moving parts and more efficient than the Wankel engine. Virtually vibration free and quiet. (PESWiki; Jan. 27, 2009)
  • Top 100 / Featured: Engines > Retrofits > MYT >
    Massive Yet Tiny (MYT) Engine Going to Production (Interview) - World famous inventor, Raphial Morgado, sets forth a plan for his technology roll-out without requiring auto maker's cooperation. One of Angel Labs' retrofit engines the size of an alternator could replace an SUV engine, increasing performance, and yielding mileage as good as a Prius. (PESN; January 13, 2009)
  • Turbine Truck Engines, Inc - Owns an exclusive license for the manufacturing and marketing of a highly innovative, environmentally-friendly 300 to 1,000 horsepower turbine-based truck engine. Known as the Detonation Cycle Gas Turbine engine, its patented cyclical detonation technology is poised to revolutionize the heavy-duty truck engine market. (PESWiki; June 25, 2008)
  • Fuel Efficiency > Engines >
    Reinventing the Gasoline Engine - A new engine concept developed by researchers at the University of Wisconsin-Madison could cut fuel consumption by about 30 percent in cars and by almost 20 percent in heavy trucks. The concept, which has been demonstrated in test engines, involves precisely mixing two different fuels in the combustion chamber, which gives greater control over both the timing and duration of combustion. (MIT Technology Review; June 2, 2010)

Non-Petrol Engines

  • Featured: Engines > J.I.M.S. >
    BB Motor Corp's Fuelless J.I.M.S Engine - BB Motor Corp claims to be launching a revolutionary new engine in 2012 that is claimed to produce huge amounts of power while consuming zero fuel and producing zero pollution. They are accepting inquiries regarding employment, marketing, dealerships, etc. Is this engine for real, or is it too good to be true? (PESN and BeforeItsNews; January 4, 2012)

Ambient Air Engines

See Directory:Ambient Air Engines - separate index page regarding engines whose energy source is ambient air.

Image:Crystal_Ion_Air_Turbine_Engine_95x95.jpg Image:Rauen_SCE_95x95.jpg


See also Directory:Cavitation

  • Featured / Best Exotic FE: Engines > Cavitation >
    Hydrosonic Molecular Accelerator Resurrects the Clem Engine (Interview) - Oregon inventor, Buck Henderson, claims to have refined both the Richard Clem and Jim Ray engines. From what we can tell, Henderson's system uses supersonic speeds of fluid dynamics along with cavitation to pull in zero point energy as the source of environmental energy that shows up in the system to run it. First applications will be semi truck or lorry engines. (PESN and BeforeItsNews; March 7, 2012)

Compressed Air

(8:52 minutes)


See Directory:Hydraulics

Image:Hydrostatic_Powertrain_95x95.jpg Image:Hydraulic_truck_95x95.jpg

Noble Gas

See Directory:Noble Gas Engines

Image:Papp_engine_fig3.jpg Image:Sabori ignition 95x95.jpg Image:Papp_Engine_fig1_95x95.jpg


  • International Automated Systems - Utility scale solar presently in process of being commercially installed for first time; alleged to produce electricity at 3-5 cents per kilowatt-hour. Highly-efficient bladeless turbine has wide range of waste-heat-harnessing applications. Methanol production technique will draw CO2 out of the environment, reversing global warming.
  • Deluge Inc's Thermal Hydraulic Engine Generates from Low Heat Input - Utilizing low level heat energy, 180°F (82°C), the Natural Energy Engine™ is suitable for solar, geothermal, or any other heat source, including waste heat from existing processes. The engine requires no combustion, operates virtually silently, and generates no emissions. Now ready for commercialization.
  • Super Soaker Inventor Develops 60% Efficient Solid-Sate Heat Engine - The Johnson Thermoelectric Energy Conversion System can achieve a conversion efficiency rate that tops 60 percent with a new solid-state heat engine. Like a conventional heat engine, it uses temperature differences to create pressure gradients. Those gradients are used to force ions through a membrane, instead of moving an axle or wheel. (Popular Mechanics; Jan. 8, 2008)
  • MAGIC engine - The MAGnesium Injection Cycle engine from Mitsubishi is powered by steam produced from mixing magnesium powder and water, which gives off heat and hydrogen. The hydrogen is burned to provide a second heat source for this emissions-free reaction. The magnesium oxide by-product is renewed using solar-powered lasers. (AutoblogGreen; Aug. 6, 2007)
  • Thermofluidics - Developing a device known as a 'Non-Inertive-Feedback Thermofluidic Engine' (NIFTE) for pumping fluids, liquids and/or gases, that operates across low temperature differences. NIFTE devices can improve energy efficiency, to provide pumping power when heat is available, and other energy sources (e.g. electricity) are scarce.
  • Thermafficient™ thermal engine - reXorce Thermionics said its thermal engine can recover thermal energy from waste, solar thermal and geothermal sources to be transformed into useable electricity, cooling, and heating. Its Thermafficient pump uses supercritical carbon dioxide and other working fluids to reduce energy costs significantly. (Inside Greentech; Sep. 5, 2007)

Steam Engines

See Directory:Steam Engines

Image:Bmw turbosteamer 95x95.jpg Image:Warren and Bill Doble in their first steam car1912 95x95.jpg Image:Green steam engine anim 95x95.gif

Linear Combustion Electromagnetic Engines

  • Linear Combustion Electromagnetic Engines - Index of designs and companies promoting designs in which a lineaer two-piston system drives magnets by induction coils to generate electricity, so that the output energy of combustion is electricity, not torque.

Low-Grade Fuel

  • Cyclone Technologies - The Cyclone Engine is an external combustion/internal expansion engine, using variable timing, variable compression ratios and multiple heat exchangers to efficiently use any liquid or gaseous fuel and create more power and significantly less emissions than current gasoline or diesel powered internal combustion engines.
  • FlexEnergy - The Flex-Microturbine power plant runs on very low energy fuel gases at atmospheric pressure: only 15 Btus per cubic foot (1.5% the strength of natural gas). Potential fuels include oilfield, industrial and landfill waste gases. In many cases, these gases must otherwise be flared consuming natural gas or propane. The Flex needs no other fuel.
  • Encore's Accelerated Magnetic Piston Generator - New (Magnetic Piston Generator) MPG design has the flexibility to be powered by any source of thermal (heat) or pressure energy to produce electricity. Propels a permanent magnet through a series of electro-magnetic coils to generate electricity according to Faraday's Law of Induction.


Other Sites

  • Gear Oscillator - This site presents an innovative and alternative design to the crankshaft - connecting rod mechanism aimed at adressing some of its shortcomings.
  • Detonation Cycle Truck Engine - Turbine Truck Engines is developing the Detonation Cycle Gas Turbine Engine for heavy-duty highway trucks, that promises to consume 30% less fuel and emit fewer pollutants than piston engines. The turbine operates on all hydrocarbon, hydrogen, and synthetic fuels, has Flex-Fuel and mixed-fuel capabilities, as well as cold start capabilities with any fuel. (Green Car Congress; Nov. 6, 2007)
  • 70 mpg 300 HP V-12 Duesenberg - The Torpedo® Coupe will be driven by the CEM engine, an air-cooled and self lubricating, supercharged 12 cylinder four-stroke engine. It has a calculated 70 MPG and 300 horsepower from a 100 pound package measuring 18 inches in diameter and 24 inches in length. Planned market introduction August 2007. (AutoblogGreen; Apr. 27, 2007)
  • Perendev Nitrogen Engine - A recyclable nitrogen engine, measuring 175 x 150mm is capable of producing 60 Kw of power. Operates on the same principle as the steam engine but in reverse. (See also Perendev feature at PESWiki)
  • Proe Power Systems afterburning Ericsson Cycle Engine is much simpler and more efficient than Stirling engines. Exceeds diesel fuel economy without diesel exhaust pollution. Ideal for alternative fuels.
  • Reg/Regi Technologies - The RadMax™ engine is an internal-combustion engine built around a rotary design. It would have two to three times the power and weigh half as much as a Wankel engine of the same size. It offers multifuel capability, fewer moving parts, high and efficient rates of combustion, low weight, reduced vibration, and ease of maintenance.
  • Pempeck Systems FP3 design is based on "free pistons" being driven back and forth inside cylinders by controlled internal combustion. Permanent magnets are attached to the pistons. As the magnets move, electric power is generated in coils placed around the magnets.
  • Agile Turbine - The ICR 225 (pdf) multi fuel gas turbine vehicle engine is light weight, reliable, has low emissions, gives high efficiency at high power and even higher efficiency at low power when the vehicle is in traffic. Efficiency is achieved using an intercooler and ceramic turbine wheel turbocharger. It can use mechanical output or an electric drive system.
  • LiquidPiston - 50% fuel efficiency based on a patent-pending "High Efficiency Hybrid Cycle" (HEHC) rotary piston, borrowing elements from Otto, Diesel, Atkinson, and Rankine cycles. One of four finalists in the ECOnomics Environmental Business Plan Challenge presented by GE & Dow Jones.
  • NEVIS Engine - The NEVIS (New Exhaust Valve & Intake System) engine is estimated to nearly double fuel efficiency. Engine weight and size are reduced with its doughnut-shaped piston but power is increased by using the engine’s exhaust vacuum energy and having 6x more power strokes per revolution than a four-stroke engine. It can be fuelled by gasoline, diesel, hydrogen and bio-fuels.
  • Axial Vector Engine is a "Barrel Type Internal Combustion Engine" that utilizes a lightweight sinusoidal camshaft to covert combustion energy into rotational energy without the use of a traditional crankshaft. The engine is lighter weight, has less moving parts and makes more power than traditional engines.
  • The Whipper Engine - Newest internal combustion axial design Revolutionary internal combustion engine design featuring piston in pistons and the wave crank or axial design. This video features inventor Roy Pfieffer with a mock up of his new engine design incorporating two new ideas, a piston inside a piston and the wave crank. These innovations can allow for extremely high RPM's and power. It eliminates the tremendous imbalance issues of the standard crankshaft and the disappointing trade off between piston stroke length and RPM's. The punch line, "This 6 cylinder engine has two moving parts!".
  • Jirnov Vortex Engine - 25 kW prototype shown to have strong torque, using half the energy, with half the emissions. $1 million grant awarded General Vortex Energy by the Navy to build 125-kW prototype. Nine U.S. patents.
  • Advanced Engine Technologies - The OX2 internal combustion engine has only six major components - of which only three are moving parts - and results in low set-up and production costs.
  • The Natural Energy Engine is powered solely by hot water and is based on the principle that fluids expand when heated and contract when cooled. This change in volume pushes and pulls on a piston creating mechanical energy. Because it requires such low grade heat, it can function using a variety of heat sources, including solar thermal, geothermal, ocean thermal, industrial waste, and biomass.
  • 1930s aircraft an inspiration for 100 mpg cars - EcoMotors has licensed the concept for an opposed cylinder/opposed piston engine from Advanced Propulsion Technologies and is working on a futuristic diesel engine. The configuration can boost mileage up to 50%, can be made 30% lighter and can enable car designs to be more aerodynamic. (CNET; Jan. 15, 2008)
    • Advanced Propulsion Technologies - The Opposed Piston Opposed Cylinder (opoc™) two-cycle engine is comprised of two cylinders with two pistons per cylinder moving in opposite directions. It is compact, lightweight and efficient, has low noise/vibration, low cost, and can use a variety of fuels.
  • Pulse Detonation Engine (PDE) - This aircraft engine design is thermodynamically more efficient than standard gas turbine systems as well as being more light weight, thus reducing CO2 and NO emissions. It is expected to be efficiently operable to Mach numbers as high as 5 at a significantly lower cost. See also After Combustion: Detonation! article at Popular Science.
  • Digital Electro-Hydraulic Systems - Developing a Danzer Cycle linear engine, pump/motor unit and novel hydraulic circuit that should provide better thermal efficiency over a vehicle’s operating range. During the power stroke, water is injected into the combustion chamber shortly after ignition, converting it to a steam engine to utilize the waste heat.
  • Oscillator Engine - This new internal combustion engine generates 1.55 times higher power by substituting pistons and crank gear with oscillating flaps. Its high performance mechanism eliminates the problems met with crank gear, typically the internal resistance and claiming higher efficiency, higher power, lighter weight, least starting effort, fuel saving in idle running, and miniature starting power source.
  • Larsen RADAX - Radial and Axial hydrogen internal combustion engine (ICE) was invented by Mel Larsen and has been reviewed by the American Hydrogen Association Northwest. Mel claimed his engine set the word record for thermal efficiency for an engine. It is an 8-cylinder, 2-stroke, 300 hp ICE that has an efficiency range of 45 - 54 percent. Video
  • Rotoblock - Oscillating Piston Engine design incorporates four pairs of pistons. Each of these eight pistons is alternately attached, through two opposed oscillating adjacent thrust discs, to two coaxial drive shafts extending from the center of one face of the cylinder block. Each piston is a segmented toroidal section traveling within the closed toroidal chamber of the rotating cylinder block. The combustion chamber is formed between each pair of pistons as the oscillating cycle continues.
  • Freedom Motors - Rotapower engine improves the Wankel-type engine performance with low cost lean burn combustion, combustion surface coating and pre-heated incoming fuel-air charge to greatly reduce emissions and fuel consumption. It offers long engine life in a low-cost design, twice as much power for its weight as most four-stroke competitors, and the ability to operate on any fuel.
  • Komatsu Zenoah - The strato-charged™ engine for outdoor power equipment attains levels of total hydrocarbon (THC) and nitrogen oxide (NOx) that are under one-third those of conventional 2-cycle engines, and it also reduces fuel consumption by 30%.
  • The Incredible Shrinking Engine - A new engine design could significantly improve fuel efficiency for cars and SUVs, at a fraction of the cost of today's hybrid technology. (MIT Technology Review; March 12, 2007)
  • Wilson TurboPower - Microturbine uses ceramic components and a three-stage turbine to achieve operating efficiency greater than 50% versus the standard 35%. The ceramic honeycomb disk heat exchanger recovers engine exhaust heat to preheat the engine’s inlet air for greater efficiency.
  • RCV Engines - Rotary Cylinder Valve engines provide an alternative to 2-strokes and lower manufacturing costs than 4-strokes, with high fuel economy and low emissions in a smaller package. The cylinder, incorporating the combustion chamber port, is rotated around a conventional piston and crank. Applications include scooters, motorcycles, small cars, lawn mowers and generators.
  • Innovation Engineering - The VCAP (Variable Compression Axial Piston) Engine was developed with the objective of greatly improving the efficiency of the Internal Combustion Engine simultaneously improving engine performance measure in terms of Power to Size and Power to Weight ratios.
  • RoundEngine by VGT Technologies - Engine that uses a doughnut configuration is claimed to have more torque and is expected to achieve savings of 15-35% in fuel consumption over reciprocating combustion engines and smaller gas turbines.
  • Kids Build Soybean Fueled Car] - High school kids (including drop-outs) design car that can go from zero to 60 in four seconds and get more than 50 miles to the gallon on soy bean oil. (CBS News; Feb. 17, 2006) (Thanks Leslie Pastor, NEC)
  • Eco-friendly transmission improves efficiency - 82-year-old Salt Lake City inventor has accomplished his lifelong dream with a super-efficient transmission that could increase mileage in a car from 20 mpg to 30 mpg. Can go in bikes, cars, helicopters and anything that has a motor. 23 foreign patents filed. (Deseret News; Feb. 3, 2006)
  • Tesla Turbines - Rather than using blades and friction, the Tesla Turbine uses parallel, closely spaced disks that tap viscosity. Aerodynamic skin adhesion effect resists fluid or gas flow between plates, resulting in energy transfer to the shaft. Technology works but is yet to break into marketplace.
  • Better than Hybrids - A proposed ethanol-boosted, turbocharged gasoline engine design approaches the efficiency of gas-electric hybrids, but could be far cheaper. (MIT Technology Review; Apr. 24, 2006)
  • Stirling Engine - Generates Energy from Small External Temperature Gradients. No Longer the Neglected Technology. Taps waste heat or cold. Displacer piston moves enclosed air back and forth between cold and hot reservoirs.
  • WhisperGen is a co-generation (heat and power) system based on a small four cylinder double acting kinematic external combustion Stirling engine (90% fuel efficiency; quiet). While the first Stirling engine was produced in 1816, only recently has anyone successfully commercialized the concept.
  • Home power from vehicle engine - An electrical generator system by Countour Hardening Inc that is powered by a truck or motor home engine. The generator is mounted on the vehicle and is controlled by the vehicle's computer hardware and software for optimum voltage control, frequency control and fuel economy. (; Jan. 16, 2006)
  • Meditronica - The De Moura Motor is an internal combustion rotary engine that is more efficient and reliable, with a very good power to weight ratio, high torque, very simple, easy to manufacture. The DMM has only 3 moving parts, using a circular combustion chamber and rotor with 2 vanes for circular intake, compression, combustion and exhaust.


  • Engine on a chip promises to best the battery - MIT researchers are putting a tiny gas-turbine engine inside a silicon chip about the size of a quarter. The resulting device could run 10 times longer than a battery of the same weight can. (MIT News; Sept. 18, 2006)

Engine Modification

  • 'Omnivorous engine' hopes to run on many fuels - "The ultimate goal is not to know what's in the tank, but to have it run as efficiently as possible on whatever comes down the fuel line," he added. "This engine can run on pretty much any liquid fuel that can be ignited with a spark." (PhysOrg; Sept. 8. 2008)
  • Turbocharged, Gasoline Direct Injection “EcoBoost�? Engine - Ford Motor Company is introducing a new 4-cylinder and 6-cylinder engine it calls EcoBoost that features turbocharging and gasoline direct injection, with approximately 20% better fuel economy. Ford is positioning the EcoBoost engines as a more cost-effective fuel-efficient alternative to hybrids and diesels. (Green Car Congress; Jan. 5, 2008)
  • PRV Induction Improves Fuel Economy up to 25% - PRV Performance has developed a Pintle-Regulated Venturi (PRV) induction system that replaces a conventional intake manifold with a Venturi for each cylinder of the engine. Testing by the company has shown an improvement in fuel economy of up to 14% in city cycle and 25% in highway cycle driving. (Green Car Congress; Oct. 14, 2007)
  • MUSIC Engine - The Merritt Unthrottled Spark Ignition Combustion gasoline engine promises to provide a 20% increase in fuel economy. MUSIC is an un-throttled, high thermal efficiency, lean-burn, spark ignition system that uses an indirect combustion chamber to produce charge stratification by means of controlled air management. (Green Car Congress; Sep. 2, 2007)
  • EA Technical Services - Technology eliminates throttling or pumping losses by using a turbine for variable pressure boosting of the intake air at any engine speed. This brings the gasoline engine energy efficiency to near that of the diesel engine, improving fuel economy. The weight of the package is about 6 kg and costs about $100.
  • Reinventing the engine - Brad Raether has developed a new piston and cylinder wall design (WaveTech) that transforms linear power into rotary power 3x more efficiently than the 300 year old piston and crankshaft. Among the potential results: Production automobiles that get 75 to 100 miles per gallon, with minimal changes to their standard engines. (The Bulletin; May 22, 2007) (Thanks KeelyNet)
  • EnviroFit - Cleaning up the air in the developing world by retrofitting up to 2 million two-stroke powered vehicles with cleaner, more efficient direct injection technology licensed from Orbital Corp. The upgrade eliminates 90% of hydrocarbon and 70% of carbon monoxide emissions while improving fuel economy more than 30%.
  • 100 MPG Car Demo in Q3 2008 - Transonic Combustion is developing an advanced fuel injection system that operates conventional gasoline engines at ultra-high compression ratios and incorporates very precise ignition timing to dramatically increase fuel efficiency. A 100 mpg demonstrator sports car is targeted to be on the road by the third quarter of 2008. (Green Car Congress; Jan. 17, 2008)
    • Transonic Combustion - By operating conventional gasoline engines at ultra-high compression ratios and incorporating precise ignition timing with carefully minimized waste heat generation, we can achieve extremely high levels of efficiency for dramatically better mileage and lower greenhouse gas emissions. A key aspect of the technology is a revolutionary new type of fuel injector.
  • Water Manipulation Motor - The rapid compression of air in a cylinder creates a temperature of 500°C which is used to boil water and implode hydrogen created by electrolysis. A four cycled engine is converted to water by insertion of a steel gasket in the cylinder head that holds the hot air until the water and hydrogen are injected.
  • Design To Improve Turbulence In Combustion Chambers - Somender Singh says a radical design change in the face of combustion chambers, by forming grooves, channels or passages through the squish areas, will further enhance in-cylinder turbulence followed by multi flame front combustion, as contained in his US Patent 6237579. Do-it-yourselfers might consider cutting some grooves to approach the effect. (PESN; Oct. 13, 2005)
  • Mike at Powrehaus.comis doing advanced cylinder head modifications including Somender Grooves, Powre Lynz and other modiciations.
  • Sonex Controlled Auto Ignition (SCAI) is basically controlled HCCI (Homogeneous Charge Compression Ignition). It enables a gas engine to run with no spark plugs using either a heavier fuel such as diesel or lighter alcohol fuels with greater efficiency and cleaner exhaust.
  • Honda's lean air/fuel (LAF) ratio sensor allows engines to run anywhere from a 12:1 air/fuel ratio up to 23:1 while in closed-loop! This means better efficiency over a much wider range of engine rpm and load.
  • Orbital Technology - Direct injection (DI) boosts the efficiency of conventional internal combustion gasoline engines. It involves injecting the fuel directly into the cylinder (combustion chamber) of an engine, instead of indirectly through an inlet port. Orbital's core technology is a unique air-assisted low-pressure direct fuel injection, combustion and engine management system collectively called Orbital Combustion Process (or OCP™) technology, that creates a finely atomised fuel cloud allowing engines to run with greater fuel efficiently and with reduced emissions output.
  • Aprilia DiTech - Direct Injection Technology engine is able to reduce fuel consumption by up to 50% for two-cycle 50cc scooters and reduces pollutant emissions by 80% without a catalytic converter, without compromising simplicity, reliability and power. Technology developed by Orbital
  • Coates - The Spherical Rotary Valve Engine creates more efficient and powerful combustion and compression stokes. A spherical port-type rotary valve system replaces the high pumping-loss poppet valve-train in a conventional engine. The result is lower emissions, more power, lower fuel consumption and no maintenance or adjustment.
  • Engine Technologies - Variable Valve Timing & Lift (VVT&L) 5% efficiency improvement; Cylinder Deactivation 7.5% improvement; Turbocharging & Supercharging 7.5% improvement; Direct Fuel Injection 12% improvement; Integrated Starter/Generator (ISG) 8% improvement.
  • Turbocharger Wastegate Video - Understanding the proper operation and adjustment procedure for setting the wastegate actuator preload. Not enough tension and the turbo will be slow to spool, too much and the turbo will spike boost causing potential engine damage. DIY and how-to videos show these steps are helpful in maintaining and repairing cars.
  • Valeo - Smart Valve Actuation technology replaces the camshaft, operating each engine valve individually. By controlling residual gases, minimizing pumping losses and deactivating cylinders and valves, fuel consumption and pollutant emissions are reduced by 20%, while increasing low-end engine torque.
  • Rotating Liner Engine - Unique lubrication concept for traditional internal combustion engines incorporates a rotation liner between the piston and the engine block. The RLE improves efficiency, decreases pollutants, increases durability, and has applications in the heavy-duty diesel market. Fuel consumption savings are estimated to be 3.0-4.5% at full load (stationary engine applications), up to 9% under urban traffic driving conditions (Class 7 or 8 truck), and 27% at idle.
  • Frisco - Combines a surface texturing technique (vibro-grooving) and polymer lapping to improve fuel efficiency by dramatically reducing the coefficient of friction of engine parts.
  • Camcon - Binary Actuator valve design recycles energy using a combination of magnets and springs and will work for years off a small power source. It replaces the camshaft in petrol and diesel engines to reduce fuel consumption by up to 20%, whilst increasing power output by 25%.
  • ALM Turbine - Developed an advanced trapped vortex combustor ("TVC"), which for most installed gas turbines can achieve ultra low emission levels with both natural gas and liquid fuel. By permitting ultra lean fuel mixtures, it improves overall turbine efficiency and reduces fuel consumption by a minimum of 2%.
  • Super diesel apparatus - By recycling exhaust gas, eliminating valve overlap timing, and using an electromagnetic flywheel, the super diesel engine increases fuel efficiency 75 - 85 percent. Inventor Daljit Singh claims a small car would get at least 100 miles per gallon with his engine.
  • OBED Open Biofuel Engine Development - Collaborative development of modifications and techniques necessary to achieve reliable engine operation running biofurls. OBED is designed to provide useful information for developers, users and those interested in running biofuels.



  • Humor > Oil / Engines / EVs > Cars >
    What if Everything Ran on Gas? (video) - A silly advertisement by Nissan about their electric Leaf depicts a world in which everything is powered by polluting, petrol engines: microwave, food processor, blow dryer, cell phone, computer, copy machines, dental drill. (YouTube / Nissan; May 26, 2011)

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