Quote:
Originally Posted by Apexaddicted
No sorry, I'm not referring to the 6 stroke as described earlier in the thread. Water would be injected into the combustion chamber right before the compression stroke.
Another idea I have been considering is preheating the injected water. Obviously it would lower the ability to prevent detonation, but keeping the water close to the temperature of phase change would allot more of the energy to increasing cylinder pressure through water vaporization rather than just getting the water to that point. Does this make sense to anyone who is a little more calculator friendly?
|
I think before compression stroke is not so useful for efficiency since that's just diluting the intake charge.
But yea if you heat the water to boiling point first (or actually, pressurize and heat to above the atmospheric boiling point, since it needs to be injected under pressure anyways) and then inject maybe in the middle of the expansion stroke you might be able to pick up some extra power and efficiency. The only issue with these quasi "6 stroke" things is that the actual heat capacity of the head and pistons and the amount of heat that gets transferred to them per combustion event isn't that high, as most of the heat leaves through the exhaust (some of which is picked up by the cooling system).