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bonuts 12-09-2003 04:32 PM

PJ Gear Drive
OK so a couple days ago I bought a Pete Jackson gear drive, of course a noisy one. Now two people in the last two days have told me gear drives are not good for as high of RPM's as a regular 2roller chain. Is this true?

Just so you know I don't actually plan on buzzing this particular motor up crazy high, but was curious if this is true. My motor I'm building is just a .030 over 350, flat tops, 305HO heads. Really nothing special, just a rebuild on the S10 motor.


NAIRB 12-09-2003 04:47 PM

Street gear drives, for the most part, are purchased for the sound they make, most of the time. A quality, double roller chain set -up requires less horsepower to operate and is race proven to very high RPM. Most racing timing gear systems consist of three gears (like a Danny Bee or Summers Brothers system).
A Pete Jackson type, dual idler would be advantageous if you had an unusual amount of align boring done, etc and a normal timing chain would be too sloppy (although you can buy shorter timing sets).
I guess there is nothing wrong with a Pete Jackson dual idler system, and if that's what you've got, it's gonna sound nice. There are two advantages to a gear drive I can think of and that would be less variance in ignition timing, and
you don't have to worry about your gears stretching like a chain will. I believe that a good true roller chain wins the performace per dollar hands down, but I can't really see where the Pete Jackson would be at tremendous disadvantage.

bonuts 12-09-2003 10:33 PM

Originally posted by NAIRB:

Street gear drives, for the most part, are purchased for the sound they make, most of the time
You hit the nail on the head, for me anyways. It was a purchase for sound... Not performance. Just wondered if they were not good for high revs.


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