<VV> Bolted Flywheel clearance

corvairduval at cox.net corvairduval at cox.net
Wed Jul 29 09:38:41 EDT 2015

I NEVER leave the inertia (? I think it is more harmonic in nature) plate
off. GM engineers had a three piece flywheel for a reason. They could have
saved a lot of money with a one piece design! Yours should even have the
extra weighted cast iron part, as it is high horsepower.

I do not cut all the head off. This is with 5/16" fine thread hardware. I
use a bench grinder and relieve the part of the head of the bolt that could
touch the bell housing bolt heads, after the assembly is bolted together.
This leaves at least 3/4 of the whole height head to provide clamping force
on the assembly.

Frank DuVal

Original email:
From: clynn66--- via VirtualVairs virtualvairs at corvair.org
Date: Wed, 29 Jul 2015 18:48:14 +1000
To: virtualvairs at corvair.org
Subject: <VV> Bolted Flywheel clearance

I am getting my 150 hp engine rebuilt. My engine builder has machined the
heads of the 12 outer flywheel bolts down so they clear the bellhousing
bolts. Its neat what he has done and clearance is not an issue now.
However, the literature says the usual solution is to chuck the enertia
plate  from the back of the flywheel away and don't use washers on the
bottom 4 bellhousing bolts. This effectively lightens the flywheel which
would probably be good for racing, but may be slightly adverse in regard to
smooth gear changes in normal road driving.
My car is only used for normal road use and is not raced so I figure I am
best to stick with the enertia plate as per original setup.
Does anybody have any thoughts on these trade offs. Also, would the
strength of the 12 outer flywheel bolts be compromised with the top half of
the heads machined off?
Colin LYNN
Perth, Western Australia

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