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Mort, Thank You.
What you write makes sense.
Again, I'm kind of slow, so I appreciate your patience in explaining things.
Lets say we inject enough "steam" into the intake stream to eliminate vacuum pumping losses, which I think we all agree are measurable and significant????
On the compression stroke, we are using the steam tables, and as the pressure goes up from 14 psi absolute to 140 psi absolute (assume 10:1 compression).
first, would the numbers really be 140 psi, or would some of the steam get compressed to liquid water, lowering the 140 psi pressure to something lower?
Second, when we hit ignition of the fuel air, temperatures would go up obviously.
If we have not reached the critical temps, some of the liquid would turn to vapor, causing the overall temperatures of the cylinder to be lower.
Lower absolute instantaneous temperatures means less losses to the cylinder head/piston.
When done, we lose less to the cylinder walls, perhaps with similar pressures.
Finally, a third argument. If we run steam, we can have higher effective compression ratios, yet limit oxygen.
Can we use steam to make a gasoline engine as efficient as a diesel engine - no throttle, so no throttle pumping losses, and full "compression" leading to higher absolute pressures upon ignition?
switching gears,
Perhaps another way to go about this all is to use cooled Exhaust gasses, and limit intake air by using exhaust gas, and again eliminate the throttle plate on the intake side.
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