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On 9 Apr 2003 at 9:34, Toby Erkson wrote: > I'm not sure I agree with the 1/3 theory -- maybe somebody with a more solid > knowledge of physics <cough>Jim<cough> could help out here. During the power > cycle, if 1/3 of the power is lost in the cylinder walls and the other 1/3 is > for the actual power of the cycle, how can another 1/3 escape to the exhaust? Physics won't help me here. I think these three choices pretty much exhaust the possibilities, and I know that the amount that actually goes into useful work is pathetically small, so these numbers aren't absurd. But I can't do better than that. For us, we have to remember that the middle 1/3 is really all the heat lost thru the cylinder walls, the head, and the piston, so a lot of this makes its way outside via the oil. -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------------------------- List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org