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Old 01-06-2006, 06:08 PM
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Rob Keller Rob Keller is offline
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and what about a old time mechanical tach? with the cable its still measuring the RPM'S of the crankshaft

I know the electric tach comes off the dist but its measuring the crankshaft revolutions or showing the cranks RPM's

the crank turns 2:1 of the cam, so the cam is turning 1/2 the speed of the crank there for the tach must double time to produce a accurate RPM reading


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