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Speedometer Drive Gears
Posted by: Wagon Master ()
Date: September 08, 2021 12:48PM

We all know that the speedo gear that hooks to the cable came in 20-26 teeth and 2 different diameters, depending on diff. ratio and tire size. When in high with any transmission our pinions go 1 to 1 with engine rpm just like a driveshaft on a water pumper.
What is the ratio of the speedo drive gears? The spiral one on the pinion shaft versus the plastic one driving the cable?
When the pinion makes 1 revolution, how many does a 23 tooth plastic gear make?


Been aircooled since 1973
Northwest Ohio 45840

Re: Speedometer Drive Gears
Posted by: cnicol ()
Date: September 08, 2021 06:11PM

8-tooth pinion so 23/8 = 2.875:1

Craig N. Coeur d'Alene ID.
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Edited 2 time(s). Last edit at 09/08/2021 06:15PM by cnicol.

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