Re: SPEEDO REVOLUTIONS PER MILE

Posted by su8overdrive On 2024/4/5 19:17:54

MPH = rpm x C (tire circumference in feet), divided by the result of F (final drive ratio) x 88.

Piston speed: stroke (in inches) x rpm, divided by 6

Or for our Euro Packard owners: stroke in mm x rpm divided by 30,000

Into the 1950s, maximum safe piston speed was 2,500 ft. per minute, tho' metallurgy, bearing design factors.