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The center main strap is often used on some high-revving engines, ie Spit &
A-series, but I've never seen the need for it on the Tractor engine.If it's
well balanced & not run at stupid RPM, the mains will last a long time.Glen
-----Original Message-----
From: Phil Gott via Fot <fot@autox.team.net>
To: Friends Of Triumph <fot@autox.team.net>
Sent: Fri, Nov 22, 2019 4:58 pm
Subject: [Fot] Center main support
Has anyone seen the need to add extra support to the center main on the TR wet
sleeve engine? We have an engine that has a steel bridge cross-bolted
underneath and supporting the center main cap. Is this needed? Just took 3
factory cranks to the machine shop and all three were bent about .002 in (.002
run out at center main when supported on first and last mains.) Two of these
were raced, the third was removed from a tired street engine. note: None of
these cranks came out of the engine with extra support at the center.
Curious as to the need for the extra support.
Thanks,
Phil Gott
114 TR4A
Sent from my iPhone
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<div> <font size="2">The center main strap is often used on some high-revving
engines, ie Spit & A-series, but I've never seen the need for it on the
Tractor engine.</font></div>
<div><font size="2">If it's well balanced & not run at stupid RPM, the
mains will last a long time.</font></div>
<div><font size="2">Glen</font><br clear="none">
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<div style="font-family:arial,
helvetica;font-size:10pt;color:black;">-----Original Message-----<br
clear="none">
From: Phil Gott via Fot <fot@autox.team.net><br clear="none">
To: Friends Of Triumph <fot@autox.team.net><br clear="none">
Sent: Fri, Nov 22, 2019 4:58 pm<br clear="none">
Subject: [Fot] Center main support<br clear="none">
<br clear="none">
<div dir="ltr">Has anyone seen the need to add extra support to the center main
on the TR wet sleeve engine? We have an engine that has a steel bridge
cross-bolted underneath and supporting the center main cap. Is this needed?
Just took 3 factory cranks to the machine shop and all three were bent about
.002 in (.002 run out at center main when supported on first and last mains.)
Two of these were raced, the third was removed from a tired street engine.
note: None of these cranks came out of the engine with extra support at the
center.<br clear="none">
</div>
<div dir="ltr">Curious as to the need for the extra support.<br clear="none">
</div>
<div dir="ltr">Thanks,<br clear="none">
</div>
<div dir="ltr">Phil Gott<br clear="none">
</div>
<div dir="ltr">114 TR4A<br clear="none">
</div>
<div dir="ltr"><br clear="none">
</div>
<div dir="ltr">Sent from my iPhone<br clear="none">
</div>
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