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Does anyone want to explain WHY this happens? What's different about a roller cam setup that causes this interaction?
I think they all do it to some degree, and that's part of the reason the timing jumps around without the collars on. The gear floats up and down as it spins within the up & down freeplay. That changes timing slightly.
Once you tighten it up using the collars on the distributor shaft, the free play is reduced and the gear has to spin within the reduced freeplay. It has less up and down motion because the collars restrict that motion.
The steel gears just handle abuse and wear better.
I wonder if anyone has tried cryogenically treating the bronze gears and seen what the results are.
Last edited by jbc426; 12/04/12 01:09 AM.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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