The Triumph Dolomite Club - Discussion Forum

The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
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 Post subject: Ratios again...
PostPosted: Sun Dec 02, 2018 12:58 pm 
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TDC West Mids Area Organiser
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Joined: Thu Sep 28, 2006 12:13 pm
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Location: Over here...can't you see me?
I've always liked the early Dolomite clock faces and aspire to install them in a Sprint.

Yesterday, I acquired a 2.5 PI speedo which has the correct 140 mph calibration...only to be immediately disappointed to see that it reads 840 revolutions per mile rather than the Dolomite 1000 revolutions per mile.

Now, I could go to the effort of calculating the differences caused by the different axle ratios and wheel circumferences, and then see if I can determine and source a speedo drive toothed to suit to make the clock read accurately....or I could ask if anyone has done so before!? :wink:


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 Post subject: Re: Ratios again...
PostPosted: Sun Dec 02, 2018 2:38 pm 
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TDC Notts,Derby & Leics Area Organiser
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Joined: Sat Jun 14, 2008 10:15 pm
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I haven't done it but how about recalibration by someone like Speedograph Richfield or Speedy Cables?- If they're still going that is.

James


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 Post subject: Re: Ratios again...
PostPosted: Sun Dec 02, 2018 2:57 pm 
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Joined: Mon Aug 10, 2015 7:20 pm
Posts: 1216
Location: Huntingdon
Why not just swap the gears inside the speedo with a 1000 TPM one and then calibrate by moving the needle on it's shaft? Think it's 820TPM for the 2.5PI not 840.

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Current fleet: Triumph Dolomite Sprint '75, Daihatsu Fourtrak, Honda CG125, Yamaha Fazer 600, Shetland 570

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Past fleet: Triumph 2000, Lancia Beta Coupe, BL Mini Clubman, Austin Metro, Vauxhall Cavalier MK1 & MK2, Renault 18 D, Rover 216 GSI, Honda Accord (most expensive car purchase, hated it on pickup from dealer, was made out of magnetic metal as only car I've ever been crashed into, 4 times), Golf GTi MK3 16v x 3


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 Post subject: Re: Ratios again...
PostPosted: Mon Dec 03, 2018 9:06 pm 
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Joined: Sat Apr 12, 2014 10:02 pm
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Location: Nr Kenilworth
If you do decide to remove the speedo needle, first remove the "peg" that stops the needle going further down and note where it lies in its non pegged position. Replace the needle in the same place then replace the peg and all being (calibrated') well it'll perform as expected :)

Tony

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