Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. [message #326314 is a reply to message #326304] |
Fri, 24 November 2017 19:05 |
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USAussie
Messages: 15912 Registered: July 2007 Location: Sydney, Australia
Karma:
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Senior Member |
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Jim,
My experience with "good overhaul shops" is that they balance the crank by drilling holes in the counterweights to lighten them or
filling the holes with lead to increase the weight.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of James Hupy
Sent: Friday, November 24, 2017 11:11 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't.
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
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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