Check out how you can help fight COVID-19!

Engine of Long-Lasting Chambers

Energy, Environment & Resources , Engineering , Technology

by Jeffery Smith | March 2, 2018
So engines burn cleanly at 2x torque, replace the crank with a fig. 8-shaped cam that keeps the piston at TDC long enough to burn all fuel.

Engines for cars, trucks, farm equipment, boats, planes, etc can all be more efficient--burn less fuel and emit near-zero pollutants. To build this idea, replace the conventional crank with a bi-lobal, figure-8 shaped cam. Arrange four cylinders in a cross, an X. The connecting rods do not join piston and crank, or cam, but join neighboring pistons. As two move toward the central output shaft, the other pair moves toward TDC. Give the cam arcs of enough degrees to keep the piston at TDC long enough at cruising RPM to burn as close as possible 100% of the fuel. The power stroke of 90 degrees in stead of the crank's 180 degrees dramatically raises torque. That allows a lower cruising RPM and lighter weight, both saving fuel and cutting pollution. The prototype works in practice. High torque is preferred for trucks, boats, planes, and racecars, too. Engine makers won't go out of business any time soon and constantly build new factories in developing countries where urban smog is deadly and damaging to child development. Raise the bar so manufacturers must turn to clean alternatives.

  • Amir.s.m June 1, 2020, 7:26 a.m. PDT
    for a today auto cycle advanced engine with compression ratio range 12:1 ( octane number of gasoline limit us to reach more compression ratio because gasoline knocking occur when engine is under full load ) engine overall efficiency is under 30%

    and for todays diesel cycle advanced engine with compression ration range 25 to 28:1 ( this is max allowable compression ratio with conventional metals ) engine overall efficiency is around 40 to 45 % ( maximum reached diesel efficiency is ranged 50% for very huge wartsilla ship engines that these are special 2 cycle diesels with speed range 100 to 120 RPM )

    on gas turbines as military and advanced turbofan commercial engines with compression ratio range 40:1 and advanced materials that can accept temperatures range 1700 degree engines have efficiency around 45% again .

    these are edge of today's internal combustion engines , as you can see the difference of efficiency have relationship to compression ratio and combustion chamber absolute temperatures , type of heat to mechanical energy converter ( piston back and forth , rotary type or gas turbine that again is total rotary ) cant change thermodynamic's laws .

    if you double torque of base engine it mean that in best conditions you reduced engine's speed to half and finally engines total power will be same ... power equal to p = speed*torque .
    you can change both parameters ( speed and torque ) for base engine with using gearbox ... in gearbox input power is equal to output power ( in reality we lose some output power du to decrease of fraction of gears that convert mechanical energy to heat )

    good lock
  • Amir.s.m June 1, 2020, 7:26 a.m. PDT
    second : other most important thing is engines maximum and minimum absolute temperatures on heat source/could sink sections that combustion chamber walls and engine internal components may Tolerance without deformation .

    in carnot cycle engine efficiency formula is : n=1-(Tc/Th)
    n : efficiency
    Tc : is the absolute temperature of the cold reservoir
    Th : is the absolute temperature of the hot reservoir
    ( both is in kelvin degree )

    for an conventional engine you think that Tc is environment temperature ( around 300 kelvin )
    if your combustion chamber can stand 1300 kelvin ( equal to 1025C ) you reach 77% thermal efficiency

    if you increase hot source temperature to 3000 kelvin ( none of routine metals,ceramics and known materials can stand in this temperature with engine internal high pressures and mechanical stresses ) you may reach 90% thermal efficiency !
    this mean 2000 degree increase of temprature only alter efficiency near 13% .

    these was absolute Theodoric thermal efficiency .
    in real engine made from real materials we have Friction losses of internal engine components , volumetric gas decrease , Thermal leak from combustion walls , limitation of elastic deformation in metals under high temperatures and many more limitations that these limitations forces us to decrease combustion temperature , cooling combustion walls , the excused gas temperature cant be in same temperature of external engine temperature ( this wants iso thermal process that take at least few hours on an internal combustion engine ! ) then our exhausted gas have temperature ranged 600 to 900 degree Celsius and Tc grow up to range 900 to 1200 kelvin !
    this dramatically decrease thermal efficiency in range under 40%
  • Amir.s.m June 1, 2020, 7:26 a.m. PDT
    dear fiend ,

    internal/external combustion engine tuque isn't depend to crank shaft shape , piston position and other things you said .

    as same full burning process are totally different from your imagine .

    in internal combustion engines on different thermodynamics cycles ( auto / diesel / brayton / Atkinson and etc ) all fuel available in ignition process will totally burn From a few decades agomany . you can reffer to Euro pollution standards ( from euro 1 to euro 6 ) its USA equivalent Carb , japan NPS and many more pollution standards from 1970 in worldwide .
    if you check these standards you can see that un burn fuel cant be in exhaust gass of all type engines ( in diesel and brayton or gas cycle other than we cant have un burn fuel we have some extra air in exhaust of engines !) because these engines work under lean stochiometery rules for example in gas cylcle engines we have near 50 to 70 % of unused air in engine outlet ! ( this extra air used for lowering combustion chamber absolute temperature for loweing turbine side temperature ).

    in therm of 2x torque in any engine its not important that how much torque you may give from engine , you can alter maximum or breaking torque in any engine with alter engines internal component dimensions when overal engine other parameters be constant ( you can double piston stroke and decrease piston bore then in same size of engine you have 2times torque ).
    you also can use engine without any crankshaft ( we have more than 20 type of rotary engines , The most popular is wankel engines ) then crank is not matter when we talk about engines!

    whats important in any combustion engines?
    first : engine efficiency that for this type of engine its depend to Carnot cycle rules , you can give maximum efficiency in absolute zero that never reachable ( in reality its depend to many factors that most important thing is engine compression ratio )
  • Kristina Fitzsimmons July 1, 2018, 7:23 p.m. PDT
    How much are you increasing engine efficiency? (roughly)
    How much pollution reduction?
  • Robert Schreib April 28, 2018, 6:03 p.m. PDT
    Dear Sirs, The FAA invented a special Nanotube air filter, to separate pure, inert Nitrogen from outside air, that is now used in airliner passenger planes, to fill up their emptying fuel tanks with the inert Nitrogen. This is because they had a disaster, where static electricity ignited an air/fuel mix in the airliner's emptying fuel tanks, but since Nitrogen is Inert, unlike Oxygen, these airliners are safe from that occurring now. But, what if we retrofitted these FAA Nanotube air filter inside of the airfoils atop all semi-trailer truck cabs, to be used to filter out pure Oxygen, to inject into the truck's diesel engines? The separated Nitrogen could be expelled through a tubing in the truck's rear, to help aerodynamically streamline the whole thing. And we could install electricity generating solar panels atop these trucks' trailers, to charge up an Elon Musk battery or Tesla Coil, to help empower this special air filter. That way, the added Oxygen would insure a total combustion of the diesel fuel, for greater mileage, cleaner atmospheric emissions and expelled soot elimination. That covers it.
  • Peter Andrews March 6, 2018, 7:33 a.m. PST
    You may be interested in LiquidPiston which has an innovative engine design that is more efficient and smaller. Another relevant company is Achates Engines which also improves efficiency and reduces emissions.