Thread: Speedo gear
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Old 05-28-2017, 06:45 PM   #8
kd4lok
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Join Date: Sep 2013
Location: Central FL
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Default Re: Speedo gear

Quote:
Originally Posted by SeaSlugs View Post
hmm its going to be a bit tricky but put the car in 3rd, jack up one wheel, and mark the tire - then count how many times you need to hand crank the engine to get the tire to rotate one revolution. like a ratio of 3.54. Its really 3.54:1 meaning it takes 3.54 turns of the input(driveshaft) to get the output (wheel) to turn one revolution.
I did not understand initially, but a recent thread advised to count TWO turns of the tire when one wheel is jacked up. I used this method to confirm that 3.78 is my ratio.
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