QUOTE ".......on a detriot the exhaust is run through normal valves and valve train, and only the intake ports are in the cylinder... that might make design a little simpler since you could adjust your camshaft to suit your intake port "timing"......"
This is really only applicable on a compression ignition engine because your incoming flow is only air. Don't these engines actually have a large valve/port overlap to scavenge the combustion gases thoroughly? With a spark ignition engine either you close the exhaust valve early and have a very large combustion gas residue or you maintain the overlap and flush a lot of your incoming fuel-air mixture out the exhaust. So you are either going to have a very inefficient engine or blow your exhaust system apart.
I suppose you could tune everything for a particular rpm and throttle opening so your valve closed just in front of the incoming charge but a constant speed constant power engine has limited applications. |