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TR4 fan replacement

To: sanborn@net1plus.com
Subject: TR4 fan replacement
From: wallaces@superaje.com
Date: Mon, 22 Jan 2001 08:30:43 -0500 (EST)
Cc: triumphs@autox.team.net
User-agent: IMP/PHP IMAP webmail program 2.2.3
Hi Brian,
Something in the back of my brain tells me that the later 140 series Volvos had 
a viscous fan that would fit; maybe a long time ago this was addressed on the 
list. 
I can't guarantee the fit part, but I did own a Volvo with a yellow bladed fan 
with a viscous coupling. Actually it could have been on a P1800S but, same 
engine.
As far as reducing rotating mass - this has me wondering: why wouldn't the 30 
lbs of flywheel on the other end swamp any difficulties with fan imbalance? Or 
is the problem then that there's some twisting of the crank trying to happen as 
the flywheel acts as an anchor and the fan tries to go wild?
Regards,
Jim


Date: Sun, 21 Jan 2001 09:38:44 -0500
From: "Brian Sanborn" <sanborn@net1plus.com>
..............Anything that will reduce the mass that rotates on the end of the 
crank is better.  My ultimate goal is to find a compatible plastic fan from 
another car that has the viscous clutch in the center and can be made to
mate with the TR hub.  The viscous or liquid clutch only runs the
fan up to a low fixed RPM and then "slips".  This  will further
reduce the harmonic vibration we get on the TR engines with the
direct connected fans.

Brian Sanborn
'62 TR4  CT16260L soon to be "O" - Groton, MA

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