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Old 08-03-2008, 08:45 PM
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GEAR DRIVES....First time user

I just completed building a motor for my vette and it's still on the engine stand. I installed a "ProComp" Gear Drive and noticed that if I rotate the engine the opposite way, there is quite alot of backlash(play) between the crank and cam. YEAH, I realize that the engine will only be rotating one direction, howver, timing chains have virtually no backlash. Is this normal?

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Old 08-04-2008, 05:31 AM
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Any gear setup has some backlash. I'm sure your gear drive was designed with that in mind. Like you said, the engine only rotates one direction. Can you masure how much backlash you actually have?
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Also, gear drives transfer any harmonics or vibrations from the lower end directly to the cam/valve train. Not a good situation. A good double roller chain is a much better choice.
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Old 08-04-2008, 12:17 PM
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I noticed the same thing and have been running mine for a few thousand miles with no problems just make sure you took the time and did it right and it will last for a long time. It will probably last longer than your ability to stand all that racket it makes.
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