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2-cycle vs. 4-cycle diesels
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All else being equal, the 2 stroke diesel looses some power and boost because the intake port opening and closing is controlled by the piston and symetrical around bottom dead center i.e. the ports & exhaust valves open before the piston completes a full power stroke. When the ports and exhaust valves are both open, some of the boost pressure is being blown right through the cylinder in order to scavenge the cylinder. A 4 stroke can use the full power stroke and because it has a seperate exhaust stroke, all of the boost can be used to increase effective compression. <br /> <br />Because it has one power stroke per revolution instead of one every 2 revolutions, a comparable 2 stroke will have more power, but I don't think the theoretical difference is a factor of 2, that would depend of valve/port timing, compression ratio, boost pressure and turbo size. I suspect the GE's are running much higher compression and effective boost to make up the difference, thus the need for a beefier bottom end, broken con rods, etc.[:)] <br /> <br />Does anyone have actual specs for GE's and EMD's?
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