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Home » Public Forums » GMCnet » [GMCnet] Reviving the Cad 500  () 1 Vote
Re: [GMCnet] Reviving the Cad 500 [message #165523 is a reply to message #165430] Fri, 06 April 2012 06:47 Go to previous messageGo to previous message
jhbridges is currently offline  jhbridges   United States
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma:
Senior Member
Well, in the LA engines (which fitted two different crankshafts) the wrong harmonic balancer fitted will produce an incredible shake.  Such that on initial startup and high idle for cam/lifter breakin, I shut the thing off because something was obviiously wrong.  In those engines, the difference is pronounced between the balancers because they fitted both cast and forged crankshafts.  As to whether a harmonic imbalance a) exists or existed in your case; and b) whether or not it might translate into a front - to - back loading, I leave to the gurus here.  However, having been bit,. I'd be well and for fair sure I had the correct balancer on the engine.  A 'pulley mounted in rubber' says to me "Balancer".
 
--johnny
'76 23' transmode norris
'76 palm beach

From: Ken Henderson <hend4800@bellsouth.net>
To: gmclist@temp.gmcnet.org
Sent: Thursday, April 5, 2012 9:16 AM
Subject: Re: [GMCnet] Reviving the Cad 500

Come on, Steve:  It took the thrust bearing out in 200 miles during which
the engine speed probably never got over 3000 and ran near 2500 most of the
way.  I just cannot imagine longitudinal loads of that magnitude coming
from a radial imbalance at that speed -- even if those.  Have I grown that
out of touch with the reality of these things?

Ken H.


On Thu, Apr 5, 2012 at 8:09 AM, Steven Ferguson wrote:

> Ken,
>  Shouldn't be a problem IF you have the entire rotating assay balanced.
>  That means pistons, rods, a ring pouch, bearing set, flex plate and
> balancer.
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell
 
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