----- Original Message -----
From: Michael Hargreave Mawson <OC@46thFoot.com>
>
> Given that it is not possible to put GT6 gearwheels into a Spitfire
> gearbox, is there any easy way to tell what gearbox I have from a quick
> visual inspection? Is there a number stamped anywhere??
Hi Mike,
That's not exactly what I said. It is possible to have a complete GT6
gearset in there - there are companies which specialise in fitting close ratio
gear sets, it's just not a simple matter of swapping out a gear. Ultimately,
whatever gear set you have is irrelevant - direct 4th gear will always be 1:1.
There is usually a number stamped on the gearbox. On the 3 rails it's on the
top face of the main case, to the right of the shift housing. I think the
number is similarly placed on the single rail box, but it's some time since
I've played with one and there isn't one to hand to check.
Regarding speedo accuracy, how do you know that your rev counter is
accurate? I assume it's an electric type rather than mechanical on a late
Spitfire - this should be more believable (the mechanical ones suffer the same
problems as speedos), but by no means infallible. Also, why do you believe the
Mazda is accurate? Our 9 year old VW Passatt is pretty optimistic and always
was when it was a much younger car in my father-in-law's ownership. There are
certainly too many variables to start pulling things apart - only calibrate
against known measurrements. At the moment both of your calibration benchmarks
are unknown variables, not a good starting point,
Cheers,
Bill.
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