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<p>The odometer and trip meter gears are driven by a worm gear
driven directly by the speedo cable. These have to be changed if
the diff ratio is changed (well, if you want the odometer and trip
meter to be accurate). These gears are known to crack and can
produce a speed indicator that 'jumps' in proportion to speed. <br>
</p>
<p><br>
</p>
<p>Thanks for the info on the speed indicator adjustment; always
wondered how that was done. I thought they might change the
'watch' spring that resists the magnets.</p>
<p><br>
</p>
<p>Bob<br>
</p>
<br>
<div class="moz-cite-prefix">On 2/22/2017 8:10 PM, WILLIAM B
LAWRENCE wrote:<br>
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<p>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.</p>
<p><br>
</p>
<p>Bill Lawrence</p>
<p>BN1 #554</p>
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<div id="x_divRplyFwdMsg" dir="ltr"><font style="font-size:11pt"
face="Calibri, sans-serif" color="#000000"><b>From:</b>
Healeys <a class="moz-txt-link-rfc2396E" href="mailto:healeys-bounces@autox.team.net"><healeys-bounces@autox.team.net></a> on behalf of
Bob Spidell <a class="moz-txt-link-rfc2396E" href="mailto:bspidell@comcast.net"><bspidell@comcast.net></a><br>
<b>Sent:</b> Wednesday, February 22, 2017 2:29:54 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:healeys@autox.team.net">healeys@autox.team.net</a><br>
<b>Subject:</b> Re: [Healeys] Lempert Gears</font>
<div> </div>
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<font size="2"><span style="font-size:10pt;">
<div class="PlainText">Yep. Going from 3.9:1, for instance,
to 3.54:1 will cause your speedo,
<br>
odometer and trip meter to indicate about 11% low; e.g. if
you're <br>
indicating 60MPH you'll be doing about 67.<br>
<br>
You can:<br>
<br>
1) get new gears for the odometer/trip meter and get the
speedo calibrated,<br>
<br>
2) get an inline ratio adapter,<br>
<br>
3) get a GPS with real-time speed readout<br>
<br>
4) get good at multiplying by 1.11 in your head<br>
<br>
Bob<br>
<br>
<br>
On 2/21/2017 5:37 PM, 1 2 wrote:<br>
> Sorry if this has been asked and answered. Will the
Lempert gears <br>
> change how the speedometer reads? Or is it independent?<br>
><br>
> Thank you<br>
><br>
<br>
<br>
<br>
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