On Thu, 28 Oct 2004 Lizirbydavis@cs.com wrote:
> Can anyone comment to the benefit of a lightened flywheel in a
> "warmed" up street motor. I will have a GP2 cam, 9.5:1 compression,
> mild head work, headers, free flow exhaust and stock bottom end. I
> don't want to spend the money on an alluminum flywheel, but I found
> one (stock TR6, machined) in Oregon (PRI Race) which, with the ring
> gear weighs 13 lbs. How much weight can be machined off safely with a
> lathe? With refacing and installation of the ring gear, how much does
> this typically cost? The PRI flywheel costs about $325.00. I would
> guess that "some" weight removed by a knowledgable machine shop would
> cost less than 1/2 this price. I'd rather save the money for
> something more beneficial (like a good sway bar system)
Comment - DO IT.
Empirical evidence - the motor will spool up more quickly.
Physics - instead of wasting HP to spin the 28 pound stock flywheel, you
can use it at the wheels.
You cannot remove 15 pounds from a TR6 flywheel by just cutting it on a
lathe. You need to cut a lot of material to get rid or _more than half the
stock weight_.
There are other advantages to the lighter flywheel, but the most important
one in my book is that it removes a lot of stress on the back part of the
crankshaft (where they tend to crack if you over-rev them).
> Joe Davis
regards,
rml
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