>
> Date: Mon, 19 Feb 90 11:58:26 EST
> From: tolsoft!amdahl!ames!garp.MIT.EDU!mit-eddie!cbmvax.commodore.com!jesup
>(Randell Jesup)
> Message-Id: <9002191658.AA06503@cbmvax.cbm.commodore.com>
> To: british-cars@Alliant.COM
> Subject: Re: Speedo on TR6 (and E-Type)
> Status: O
>
> >well, on my friends bugeye'd sprite, the tachometer was electrical, and
> >measured the RPM by means of an inductive pickup off the wire bringing
> >12 volts (originally ground) to the coil. when the points closed, and
> >the coil charged, a current would flow in the wire which would induce a
> >voltage inside the tach.
>
> Uh, I think you're confused. The Bugeye's (and the Mk II's) had mechanical
> tachs run off the generator (via a hard-to-find little gearbox). Starting
> with the Mk III (1098cc, roll-up windows, etc) they switched to the
> inductive tachs, which were used for the rest of the sprites and midgets.
> Also interesting was that the inductive tachs would vary their readings
> slightly depending on whether the lights were on (voltage drop).
>
> oh! his car was definitely a bugeye, so i guess someone had retrofitted
> an inductive tach into it. i guess i was confused as to how the tach
> switch was done, though ...
>
> craig
>
I am not really surprized by this. Bugeyes with 1275s and disk brakes
are not that uncommon. The mechanical tachs were, I understand,
troublesome, so i'm sure a lot of them have been replaced. Also, a
lot of cars have had alternators put in, or later model generators
without the tach drive. My speedo bounces badly sometimes and my
Smiths (electric) tach is wildly optomistic. I just enjoy the sound
(no radio, either) any try not to worry about any of it.
phile@pwcs.stpaul.gov
--
Login name: phile In real life: Philip J Ethier
Phone: 298-5324
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