[Healeys] speedo questions

[HealeyRick]

My Nasty Boy has a Lempert rear, a Ford T5 transmission and a stock Healey
speedometer.  I made a couple of attempts to get them to play together that
were unsuccessful.  I saw on another forum a GPS driven unit that would
allow me to use my stock speedo and I became a beta tester (full disclosure
I get a free unit for being a beta tester)  They are now in full production
and the Classic Speed is now available for sale:
http://www.classicautoinnovations.com/classic.  I'm very happy with it and
solves the problem  of running different non-stock rear ends and
transmissions.

Happy Healeydays,
Rick Neville

On Sun, Dec 4, 2016 at 4:34 PM, Bluehealey <bluehealey at gmail.com> wrote:

> Hi Bob.
> For what it's worth I have found that 1152TPM is the closest calibration I
> could get to suit the set up on Bluehealey.  I have a 3.54 Lempert diff on
> overdrive box with 180XAS Michelins. Rolling radius of those I found to be
> 312mm (12.3").
> The set up uses a 32tooth worm wheel and 36 tooth Odo wheel.  The
> displayed mileage and actual mileage are pretty close and have been checked
> over a few hundred miles against a Sat Nav. Error is about 1-2%.
> Your tyres will be the only variable with my arrangement.
> Speedo calibration is all over the place. I just moved the needle,
> relative to the drive cup, until 60mph matches my sat nav display.  All
> other speeds above and below will be off a margin.
> Give me your rolling radius of the tyres and I will be able to provide the
> best Turns per mile sett up.
> Enjoy.
>
> Alan - from my iPad
>
> > On 4 Dec 2016, at 19:32, Bob Haskell <rchaskell at earthlink.net> wrote:
> >
> > Listers,
> >
> > What's the thickness of the washer that is fitted between the gearbox
> and the right angle drive (PN 3H550 or Moss PN 324-720)?
> >
> > There are two MPH speedometers fitted to the 3000 MkI and MkII; one for
> overdrive and one for non-overdrive cars.  What's the speedometer
> calibration (turns per mile) for each?
> >
> >        BMC P/N    Smiths P/N   TPM
> > non-OD  BHA4124    SN6155/19     980???
> > OD      BHA4126    SN6155/21    1080???
> >
> > When fitting a 3.54:1 rear end to an overdrive equipped car, does the
> non-OD speedometer have the correct calibration?  I think that it would if
> the gear ratios for the speedometer takeoffs on the extension housing of
> the non-OD gearbox and on the overdrive were the same.  If not, what
> calibration (TPM) have folks used?
> >
> > Cheers,
> >
> > Bob Haskell
> > AHCA 3000 MkI registrar
> > http://www.ciahc.org/registry_3000mk1.php
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