Actually calibration is accomplished by a special device that uses
electromagnetism to gauss or degaussing the aluminum disc in the speedometer
head to provide more or less magnetic flux acting against iron rotor. I
learned this when I went in to bug Margaret Lucas about why she had my speedo
so long. For that reason they can calibrate any speedo to run with about any
gear ratio/tire diameter combination.
I doubt very much if the drive gears on the transmission output shaft are
different, although I think Triumph was into such foolishness. I think you
could determine the truth by comparing the part numbers between the various
models.
Actually Per, the 3.545 gears are not as rare as they used to be. Contact Mike
Lempert as he is producing runs of these batches of these gears. I have a set
in my BN1 and it's like a magic carpet...
Bill Lawrence
BN1 #554
> Date: Mon, 16 May 2011 01:19:47 +0200
> From: healeyguy at bredband.net
> To: healeys at autox.team.net
> Subject: Re: [Healeys] Speedometer gearing
>
> Hi
> I didn't calculate those numbers, that's the numbers that are written on
> the faces of the speedos. Are you saying that you have 1000 on your speedo?
> Clausager says that 100-6 came with 4.1 for overdrive, 3.909 without.
> and 3000 came with 3.909 with overdrive, 3.545 without.
> The 3.545 must be very rare I think, wish I had one.
>
> Best regards, Per from Sweden
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