In a message dated 5/19/2003 9:12:01 AM Eastern Standard Time,
herald1200@comcast.net writes:
> (PS- Math Question- 4,000 RPM in 4th gear(regular 1200 gearbox) into Spitfire
>differential(same as 1200 Herald) with 13" tyres(again, standard) How fast am
>I going? And how fast if I am at 5000 RPM? I have no idea, and am looking for
>a ballpark speed- my speedo is a bit buggy, and jumps moderately at speeds
>over 50.)
The original Dunlop Gold Seal 5.20 x 13 tire and 4.11:1 differential would have
given you 15.7 mph per 1000 rpm's. So your "ballpark" is around 16 mph per 1000
rpm's, or 64 mph @ 4000 and 80 @ 5000, assuming whatever tires you are
currently using are about the same or a bit larger in circumference. (FYI: for
the Vitesse 6/Sports 6 with 5.60 x 13 tires, the magic figure is 16.4 mph per
1000 rpm's.)
--Andy Mace
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