This chart brings up an interesting question for me.
My 'B is a 1977. I don't remember when it was manufactured, but
I think it was late '76. And it has the 120MPH speedo, indicating
some 11-12k miles. I don't remember off the top of my head.
At first I thought this to mean 11x,000 miles. But then I thought,
it probably had an 85mph speedo that broke and this replaced it.
But is it possible that this is the original speedo?
Paul.
Max Heim wrote:
> on 8/25/03 7:18 PM, Eric J Russell at ejrussell@mebtel.net wrote:
>
>
>>The speedometer on our 1978 MGB is about 15 mph optimistic (indicated
>>60 mph is about 45 mph per GPS).
>>
>>It does have non standard tires ( 185 70 R14 ) but I was wondering if
>>the angle drive that *should* be on the back of the speedometer is
>>part of the error.
>>
>>i.e. is the angle drive on the back of the speedo other than a 1:1
>>drive?
>
>
> No, it's 1:1.
>
>>Also, the gearbox is possibly from an earlier model. Are the speedo
>>drive pinions (Moss # 462-600 'thru '74 vs. # 462-605 1975 on ) a
>>source of speedo error in our '78 MGB?
>
>
> This is probably your problem. The pinion and the speedo need to be matched.
> Tires should be factored in as well, but there are some combinations that
> cannot be perfectly resolved. There is a link to a speedo chart on this
> site: <http://www.mgbexperience.com/>. You will need to determine the actual
> origin of your tranny to use it.
--
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