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[quote]QUOTE: Originally posted by drailed1999 OK ED. Time for machinist 101. a 4 stroke cycle GE or EMD prime mover has 4 valves in the cyl. head, 2 intake & 2 exhaust. In a 2 stroke cycle ( EMD 567,645,710 )there are 4 valves also but they're all exhaust valves. at the bottom of the piston stroke there is a ring of holes that open into an airbox that is supplied by the roots blowers or the turbo. then the cylinder fires every time the piston comes up. don't get snake bit, no reed valves. this ain't no chainsaw PS, EMD 2 strokes turn 905 RPM and EMD & GE 4 strokes 1050 RPM [:p] [/quote] Derailed,...Nice to have an authority!! If I can take advantage of your knowledge? Applying a 4 stroke mentality to 2 stroke theory, it always seemed a little odd thatt the intake and power stroke were one in the same with a 2 cycle engine, while the exhaust is (i guess just taken for granted that it will happen at the bottom of the power stroke) a scavenger action ... is that all correct up to this point? If so it sure looks like they are bleeding a lot of power by compromising the power stroke's total potential. I can see how a driven input such as a turbo or a blower helps ventilate the combustion chamber by helping to force out the combustion byproducts of the previous cycle, but at what points, in terms of top dead center of piston travel, is the intake portion of the cycle made, and at what point in the piston cycle is the fuel injected? Just curious, thanks in advance for your input
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