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Re: More on TR-3 overheating recommendations.

To: triumphs@autox.team.net
Subject: Re: More on TR-3 overheating recommendations.
From: John Wroclawski <jtw@mercury.lcs.mit.edu>
Date: Fri, 8 Nov 1996 17:33:29 -0500
References: <199611072031.PAA25238@mail3.voicenet.com>
At 12:14 AM -0500 11/8/96, Chip Old wrote:
>On Thu, 7 Nov 1996, Stuart Bollen wrote:
>
>> John, I installed a Spitfire fan and it works great. My only concern is
>> that someone told me the original fan acts as a crankshaft damper
>> because of its weight, and a plastic fan could cause the crank to break
>> at high RPM. Anyone got any comments about this?.
>
>I've had a plastic TR6 fan on my TR4 for years, and the crank is still in
>one piece.

Still, the problem is real. TR234 cranks have a nasty harmonic vibration
which sets in a few hundred RPM above the redline. On occasion, they
break...

>From what I've heard, it's very rare for a fanless crank to break if the
RPM limit is strictly observed. But if you don't like that idea, you can
add a harmonic damper. There are a couple of options; you might try British
Frame and Engine for up-to-date info..

-john w.



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