Can anyone advise what turns per mile is required for the 77-80 odometer in
a bog standard MGB GT with 3.07 axle (MGC type) and Rover 3.5L with SD1
5-speed? Tyres are 185/70/14. Is there some sort of formula one can use -
or is it just a black art?
At 01:47 PM 7/31/02 -0500, Barney Gaylord wrote:
>At 08:59 AM 7/31/02 -0700, Joseph Cianciotti wrote:
> >I have a Jaeger (120MPH) speedometer from a MkI MGB Roadster. Would it
> >fit, and or be correct for, an MGA?
>
>Yes it fits, and no it's not correct and won't work right in the MGA.
>
>Look on the face of the instrument below the main odometer. Find a couple
>of numbers. The one on the left is the model number. The one on the right
>is turns per mile. I believe the MKI MGB (with 3.905 final drive) was 1280
>turns per mile. Early MGA 1500/1600 (with 4.300 final drive) were 1450
>turns per mile. MGA 1600-MKII (with 4.100 final drive) were 1380 turns per
>mile. If you install the MGB MKI speedo in the MGA (MK1) it will read 13%
>high on both speed and miles. You could pay an instrument shop $$$$$ to
>recalibrate it, or you could just procure a correct speedometer for the MGA
>for (probably) a lot less money.
>
>Barney Gaylord
>1958 MGA with an attitude
>http://www.ntsource.com/~barneymg
>
Regards
Barrie
Barrie Robinson - barrier@bconnex.net
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