Jon Hagen - 8/11/2014 20:56
badger@uw - 8/12/2014 19:20
The Miller cycle is ideal - plus running at low RPM allows for flame prop. Agree with 100% option!
Univ. of Minnesota has a great project running 'wet' ethanol in conventional diesels via fumigation. Impressive gains that every old time diesel tuner knew about for years.
Thanks for the great information badger@uw . What so many don't understand that pure BTU,s would only rule in a 100% efficient engine. The typical gasoline or spark ignition engine is only about 30% or a bit more efficient. !/3 makes hp, !/3 goes out the exhaust as waste heat and 1/3 goes out as waste heat through the cooling system.
The design of the fuel and the design of the engine burning it can shift those % numbers around quite a bit. Anything you can do to turn more of the aprox 2/3 waste heat into cylinder pressure to turn the crankshaft, will increase the efficiency of that engine.
As SAAB showed years ago, you can make a spark ignition engine that will make equal or better mpg using a considerably lower BTU fuel.
( Gasoline VS E100 or E95 wet Ethanol..
)
Breaking OPEC ; Ethanol Optimized Engine Project
