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Home » Public Forums » GMCnet » [GMCnet] Reviving the Cad 500  () 1 Vote
Re: [GMCnet] Reviving the Cad 500 [message #163506 is a reply to message #163490] Mon, 19 March 2012 10:01 Go to previous messageGo to previous message
James Hupy is currently offline  James Hupy   United States
Messages: 6806
Registered: May 2010
Karma:
Senior Member
Rob, rocking couple imbalance is very common in V-twins and Vertical twins.
As a V-8 is just 4 of them, the condition also exists in them. I don't
think that the forces act outside of the rotational plane however, which
might rule our thrust forces. Something is either introducing a mammoth
amount of abrasive material to the thrust surfaces, or some force greater
than what would be applied by a manual clutch is putting end play loads on
the crankshaft that is displacing the lubricants present in the thrust
area. As this type of loading is difficult to imagine in an engine with a
torque converter, it makes me scratch my head & ponder WTF?
Could it be the lubricant that he is using that does not have enough anti
scuff/anti wear additives? Dare I mention ZddP? Probably not a great idea.
I kinda am leaning towards that arena with the information at hand.
Jim Hupy
Salem, OR
78 GMC Royale 403

On Mon, Mar 19, 2012 at 5:05 AM, Rob Mueller <robmueller@iinet.net.au>wrote:

> Johnny,
>
> I was wondering if it is possible in a V-8 engine to have enough couple
> imbalance in the crankshaft to cause it to move forward and aft?
>
> For those of you who don't know what couple imbalance is:
>
> http://www.azimadli.com/Vibman/coupleimbalance.htm
>
>
> Regards,
> Rob M.
>
> -----Original Message-----
> From: Johnny Bridges
>
> Some days it's the elevator. Some days, it's the shaft. You may be down
> to
> RF&RA (Rage, Frustration, and Random Actions). If the transmission isn't
> pushing against the shaft, what are the other possibilities? Slightly bent
> cionnecting rod? Out of line cam drive? The diety doesn't like you?
>
> --johnny
>
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