Quote:
Originally Posted by racprops
A ICE engine is at best 30% efferent, that means at best only 30% of the fuel fed into a engine makes WORK, that at best only 30% of the burning fuel is able t push a piston down.
The rest is either still burning on the exhaust stroke, still burning as it leaves the engine which is a major cause of engine heat.
And some just does not burn at all.
This is what the Cats are used to burn this left over unburned gas and other pollutions.
A major fact is liqueur gasoline does not burn. ONLY Vapor does.
The problem is there is not time for the gasoline in a chamber to fully vaporize.
The theory is if gasoline was converted into 100% vapor a engine will run very well on only 30% pure vapor, not needing the 70% not used be a standard engine.
The theory is such an engine would burn nearly 100% of its fuel and thus product hardly any pollution.
The theory is such an engine would get great MPG using only about 30% of the fuel it used to need.
The theory is such an engine will not need any advance timing as vapor burns very fast.
The theory is such an engine will run at a very low temperature as all the fuel is burned within the chamber.
There has been many climes and demos of such systems.
Rich
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There's a lot of misinformation here, unfortunately. This is simply not the case in modern fuel injected vehicles, and only partly correct even in the least efficient carbureted vehicles.
In a modern vehicle (such as the one I drive) more than 99% of fuel is combusted before the end of the power stroke. The best modern production engines reach about 41% efficient (from Toyota and Honda) and even some of GM's big V8s approach 35% in their peak BSFC island.
Consider this: for an engine to be 100% efficient, it would need to:
1) Have exhaust that was the same temperature as the air going into it. This is simply not possible in a combustion engine. Even the best combined cycle power plants only reach the mid to upper 50's % efficiency, and they cycle heated gasses back through several times to attempt to extract more heat from them.
2) Have cylinder walls and pistons that absorb zero heat from the combustion chamber.
3) Have zero friction.
4) Have zero accessory losses - e.g. free energy to run things like direct injection systems, oil pumps, water pumps.
5) Use zero energy pulling air into the engine, and then zero energy pushing exhaust out.
All of these things add up to give that ~59% energy (best case) not going to propel the vehicle forward which my car sees.