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Old 03-21-2008, 03:44 PM   #10 (permalink)
LostCause's Avatar
Join Date: Feb 2008
Location: California
Posts: 504

Thunderbird - '96 Ford Thunderbird
90 day: 27.75 mpg (US)
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I wonder why an optimum rpm exists? The only things I can think of are:

Increased Inertial Loads at High Rpm?
Increased Friction at High Rpm?
Varying Disparity Between Piston Speed and Flame Front?
*(I know this set a limit on piston size during WWII @ ~5.5" Bore + Stroke)
Piston Position @ Peak Pressure?
Combustion Gas Dwell Time in Piston
Little Magic Elves Need Time to Do Their Work

Answers are no fun without the reasons.

- LostCause
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