At 01:23 AM 4/18/2008, Mark J Bradakis wrote:
>So we have this Alpine in the shop, Series V, I think (I'm a Triumph
>guy, what do I know? ) The owner says the speedo reads too low,
>following a car doing 55 mph his reads 42 mph, roughly 75% of
>what it should.
>
>It appears to have the original 3.89 ratio final drive. It takes 4.25
>revolutions of the driveshaft to make the speedo cable complete
>one revolution. The numbers on the Jaeger speedo are 5324/50 1020.
>
>The owner claims that the speedo was redone by Nissonger recently.
>The cable turns freely, no kinks, no binding.
>
>Any ideas why the speedo reads so much lower?
This Speedometer seems to have been intended for
a 4:22 rear-axle Alpine. This was the alternate
setting. I don't have time at the nonce to dig
out my archive of Rootes Group parts manuals
(shucks, I have a LOT of these) but will do so if this would be helpful.
Operating from memory, which is always dangerous,
I believe that a lot of Alpine IV's came with the
4:22 rear end and all Alpine V's did so, but I
certainly could be wrong. My Alpine literature
is buried at the bottom of a stack of boxes and I
just had to exhume it to answer a query over on
the Tiger List about stock wheels.
It would seem that you have a 4:22 speedo fitted
to a 3:89 rear-end. Again, I will be happy to
dig out the literature if this would help.
It would help us if you would provide the body
s/n. A Series V, of course, certainly could have
a 3:89 rear axle for a number of reasons.
Marc
msmall@aya.yale.edu
Cha robh b`s fir gun ghr`s fir!
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