| Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. [message #326304 is a reply to message #326303] |
Fri, 24 November 2017 11:11   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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MOST OF the harmonic balancers that I have encountered on Olds engines that
have not been tampered with, do not exist any evidence of lightening drill
holes on the outer ring. That tells me that the purpose is to cancel
harmonics, not engine balance. The engines that have been overhauled and
rebalanced frequently DO HAVE drill spots on the balancers as well as the
flex plates, as is common in good overhaul shops.
Don't know all the specifics of engine harmonics on multi-cylinder
engines, but it is a complex mix of crank pin location, firing order,
stroke length, rpm range, etc, etc. But I do know this much. If a
compensating balancer is separated and no longer aligned like the factory
did it, it possibly is not a good thing for engine longevity.
Jim Hupy
Salem, Or
On Nov 24, 2017 8:54 AM, "John R. Lebetski" wrote:
> Emery --GM called it a Delcotron.
> I did know the rubber can shift and give erroneous timming readings Does
> that also change the balance and increase the crank stresses at certain RPM
> ranges?
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
>
>
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