| AARRRGH! I said it backwards! Good catch.
A faster RPM moves the thetaPP later---makes for a higher EGT--less expansion.
Sorry, but as you all know, stupid is as stupid does!!!!!
As for the timing change, think about what that does to the thetaPP.
On May 29, 2007, at 2:46 PM, Colyn Case on earthlink wrote: Walter said, RPM: Higher RPM move the EFFECTIVE timing closer to TDC. This results in more expansion = lower EGT.
Walter, I understand why higher rpm moves the effective timing LATER but I don't understand why that results in "more expansion" ...also & btw I didn't understand why 7.5:1 timing being two degrees earlier improves the relative bsfc to the 8.5:1 Colyn
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