| Re: [GMCnet] Did you know your timing mark can MOVE on Olds engines? I didn't. [message #326322 is a reply to message #326320] |
Fri, 24 November 2017 20:38  |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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I, on purpose, did not want to get too in depth into the art of engine
balancing, particularly in the area of "odd-fire" v-6 engines vs "even
fire" v-6's. Suffice it to say that there is considerable room for
discussion there.
Jim Hupy
On Nov 24, 2017 6:33 PM, "Ernest Dankert" wrote:
> Drilling the harmonic balancer to balance the engine will shift the rpm
> band the balancer is to operate. The crank will
> have rpm ranges where it will wind and unwind (resonate) due to the firing
> order. The rotational mass is bonded in rubber
> at the opposite end of the crank to counteract the effect. [On my 1977
> Chev 350 the timing mark is aligned with the key
> way.]
>
> I will go so far as to say if your harmonic balancer is drilled to balance
> the rotating assembly it will shift the operating
> rpm band to actually be detrimental.
>
> Running the power unit on cruise control to the tuned region would hasten
> the point to where the timing alignment would shift.
>
> I seem to recall some classroom discussion in my Dynamics class regarding
> crankshaft loading; unfortunately my notes are gone.
> --
> 1977 Eleganza II
> Ogden NY
>
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