[Healeys] Lempert Gears

Wed Feb 22 21:10:10 MST 2017

Actually it is simpler than that. The speedometer is trimmed by varying the amount of magnetic flux in the permanent magnets in the speedometer head. This is accomplished by placing the gauge in a machine that can adjust the magnet's strength. A good gauge shop can do this if they know the number of turns the cable makes when it runs over a set distance. Usually they ask you to count the number of turns the cable makes as the car is moved 53 feet. Multiplying by 1000 gives the number of turns per mile and the gaussing/degaussing machine does the rest.

Bill Lawrence

BN1 #554

From: Healeys <healeys-bounces at autox.team.net> on behalf of Bob Spidell <bspidell at comcast.net>
Sent: Wednesday, February 22, 2017 2:29:54 AM
To: healeys at autox.team.net
Subject: Re: [Healeys] Lempert Gears

Yep.  Going from 3.9:1, for instance, to 3.54:1 will cause your speedo,
odometer and trip meter to indicate about 11% low; e.g. if you're
indicating 60MPH you'll be doing about 67.

You can:

1) get new gears for the odometer/trip meter and get the speedo calibrated,

2) get an inline ratio adapter,

3) get a GPS with real-time speed readout

4) get good at multiplying by 1.11 in your head


On 2/21/2017 5:37 PM, 1 2 wrote:
> Sorry if this has been asked and answered.  Will the Lempert gears
> change how the speedometer reads? Or is it independent?
> Thank you

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