[Healeys] Speedometer gearing

[pennell at cox.net]

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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