----- Original Message -----
From: Michael Hargreave Mawson <OC@46thFoot.com>
> Alternatively, is
> it physically possible that a single gearwheel has been replaced with
> one from a GT6, to give a quieter/smoother cruising gear?
In a word - no.
> John? Are you there? Is there a speedo drive gear that could have
> been fitted to a 1500 gearbox that would give a 9% *low* reading on the
> correct speedo? And which speedo drive gear should I replace it with?
I don't think John's on this list, though he's a regular on the
spitfire-enthusiast yahoo group and (as you know) the Herald group.
> Ah, well, you see, I did have a problem with the original speedo in this
> car, and fitted a replacement, which I then calibrated to the rev
> counter (assuming a stock gearbox). The magnet *is* tired, and it
> required a 7-9 mph tweak at rest to give a "correct" reading at speed.
> "Correct" in this instance meaning 18 mph per 1000 rpm in fourth. The
> speedo still reads 18 mph per 1000 rpm, so it hasn't deteriorated any
> further over the last year.
This would make me even more confident that the fault lies within your speedo.
I can supply an almost limitless supply of used speedos, or it should be
possible to have your original unit recalibrated. As long as I know roughly
what the error is I'm inclined to live with problems like this,
Cheers,
Bill.
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