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Author Topic: tachometer drive ratio?  (Read 178 times)
bevans6
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1980 MCI MC-5C




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« on: July 02, 2014, 12:15:58 PM »

My engine has a tachometer drive coming off the blower in some way.  It probably has a gear ratio driving it at other than blower speed, in order to make it useful.  Does anyone know if Detroit had a standard ratio for the tach drive to crank speed?  I was just going through some stuff and found a cable drive tach that I might try to hook up.  Picture has it showing with a little blue cap on it, just beside the blower drive cover plate.

Thanks, Brian
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1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
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1978 Lola T440 Formula Ford
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eagle19952
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« Reply #1 on: July 02, 2014, 12:32:48 PM »

I think the drive is specific to the tach...I could be wrong I often am... Huh
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luvrbus
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« Reply #2 on: July 02, 2014, 07:05:56 PM »

That drive to the angle can be from 1.80 to 2.05:1 ratio are you your the tyne shaft is there most get broken off over the years and are never drilled out

good luck
« Last Edit: July 02, 2014, 07:31:36 PM by luvrbus » Logged

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