This is the same trouble that I have sent severeal messaages on. The TR-6
engine is prone to this because the crankshaft is a whip ( no overlap).
Measured on a scope with potentometers on each side of the flywheel at the
ring edge, the flywheel moves back and forth over .500" at 6200 revs. What
this does is actually stretch the bolts, then the flyweel is loose and the
bolts break in shear and all is lost. The fix I found was the liughtest
combination flywheel and clutch,( mine was total of 13 pounds) then put
7/16" FLYWHEEL bolts in the crank and add two more. The bolts must be hard
not just strong....not grade 8 or stainless or most of the aircraft stuff.
They are stong but will stretch. The NASCAR shops have the ticket. Hard
bolts is the ticket, such as they use for hold down clamps on a mill.
----- Original Message -----
From: <BillDentin@aol.com>
To: <fot@autox.team.net>
Sent: Wednesday, March 20, 2002 11:13 AM
Subject: Fwd: flywheel
> Return-path: <BillDentin@aol.com>
> From: BillDentin@aol.com
> Full-name: BillDentin
> Message-ID: <b0.23db4ec7.29ca38d9@aol.com>
> Date: Wed, 20 Mar 2002 14:11:21 EST
> Subject: Re: flywheel
> To: fasttrs@mindspring.com
> MIME-Version: 1.0
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> In a message dated 03/20/2002 12:53:03 PM Central Standard Time,
> fasttrs@mindspring.com writes:
>
>
> > I pulled the transmission on my TR6 IT racecar Tuesday. The flywheel was
held
> > on by two bolts(barely), and the other two bolts were broken. The
crankshaft
> > looks like there is metal from the flywheel molecularly bonded to it!
Has
> > anyone ever experienced this before or have an explanation for this
> > phenomenon? The PO must have run it a while with the flywheel loose.
> >
> >
>
> Mike:
>
> I have no experience with the TR6, but we experienced similar with the
> TR2/3/4 engines we run. It is most probably an indication you are
producing
> some serious horsepower. That's good news. Bad news is the standard bolt
> set up can't handle it. We had our machine shop re-setup the whole
assembly
> fastening system, adding two additional bolts and one additional centering
> pin. Absolutely no trouble since. We use the best bolts we can find.
>
> Bill Dentinger
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