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.815 fifth gear x 4.312 diff = 3.514:1 overall top gear ratio.
876.1 tire revs/mile x 3.514 = 3078.86 engine revs/mile;
@ 60 mph = 3078.86 engine rpm.
84.6mm (3.33") stroke @ 3080 rpm = 1709 ft/mn piston speed.
It is said that many engines achieve peak efficiency at 1000-1200 ft/mn piston speed.
1800-2200 engine rpm = 1000-1200 ft/mn piston speed.
That also equals 36-44 mph.
If that piston speed theory applies to your engine, it looks like you could benefit from a "gear-up"... or get used to cruising at 44 mph.
Last edited by Frank Lee; 05-04-2011 at 07:39 AM..
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