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  #1  
Old 9th May 2015, 09:45 PM
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mgglep mgglep is offline
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Default type 9 cable rotation

Hi all bizarre question but does anyone know how many times the Speedo cable rotates per revolution of the wheels on a Ford type 9 box can't test it myself as I haven't got a cable on my box
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Old 10th May 2015, 08:59 AM
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depends on speedo drive gear as there are a few different applications.

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Old 15th May 2015, 12:29 AM
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In general most speedos are calibrated for 1000 revolutions per mile. The Sierra tyre size is 185/60R14, which gives 887 revs per mile, which means 1.127 revs of the cable per wheel rev.

When I switched from mechanical speedo to digital, I used a Hall speedo sensor that sends 8 pulses per revolution in place of a cable. I calibrated the speedo for 5000 pulses per km (=8046 pulses per mile) and it is dead on.
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Last edited by alga : 15th May 2015 at 12:34 AM.
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