Per,
Cannot answer your question. But is there perhaps enough difference in the 3rd
and 4th gears in the gearbox of the two cars to require the different speedos?
Just a thought. However, 980 compared to 1575 seems like a whopping difference
for so little variation in the gearbox or rearend.
Keith
---- Per Schoerner <healeyguy at bredband.net> wrote:
> Hi
> I'm trying to figure out the speedometer drive gearing inside the
> different gearboxes. I'm helping a friend with his speedometer. He has a
> 100-6 which was delivered without overdrive. My own car is a 3000 mk2
> with overdrive. The rear axle gear ratio on these cars are the same, as
> far as I understand, according to Clausagers book. But the speedometers
> are different. The 3000 speedometer needs 980 revolutions per minute to
> show 60 (MPH) and advance the odometer 1 mile in one minute. The 100-6
> speedometer needs 1575 revolutions per minute to do the same thing. Note
> that both cars are imported from the states, so both are speedos are in
> miles.
> Does anyone know what the difference is? Well, I can calculate it of
> course, but I thought asking on the list would be safe in case I have
> got something wrong.
>
> Best regards, Per from Sweden.
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