Quote:
Originally Posted by racprops
You getting close, Consider this: Gas burns SO SLOWLY that they have to start it burning some 30 degrees (or More) BEFORE top dead center...and as even the finest droplets are NOT vapor but converting TO vapor only 30% is able to produce the power stroke, the rest do burn but make no power as they are still burning though the rest of the rotation of the crank and the final piston moving though bottom dead center and back up in the exhaust stroke and still are burning on its way out of the exhaust valve and out the exhaust manifold and tail pipe, which is IF you were running straight pipe a like a dragster you see flames.
The power stroke is some 10 degrees after top dead center and down to about 70/80 degrees to bottom dead center, after bottom dead center that burning fuel is a waste of fuel as it can make no power..do no work.
IF you are running vapor you then need timing of ZERO DEGREES or a couple of degrees AFTER top dead center because vapor explodes so nearly 100% can produce the power stroke and THAT means all of the 20 to30% of the fuel makes more power with no waste and give more power an more MPG.
It is used up during just the few degrees of crank turning after top dead center and can be all gone before bottom dead center, and there is no (or very little) waste of fuel.
At least that is the theory... as I under stand it.
Knocking is when fuel burns or explodes BEFORE top dead center...
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Then you want a diesel engine. Fuel is injected no more than 4 degreed before top dead center and is burned up well before 45 degrees after top dead center.
Gasoline has to burn slow, fuel that just all explodes at once will blow cylinder head gaskets, crack pistons and bend connecting rods.
Diesel explodes as soon as it hits the inside of the cylinder but there is only a tiny amount exploding, then the rest burns as fast as it gets injected.
Heat still needs to be rejected at the end of the cycle to produce work. You can try to build a superheat engine that produces work with no heat rejection.
Many have tried, all have failed.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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