Listers,
I know this one has been discussed--well, beat to death--but it looks
like I'll have to pull my BJ8's gearbox/OD to replace a leaky front
seal, so I'm thinking of installing a lightened flywheel while I'm at
it. My main reason for considering it is to stop some pretty significant
run-on ('dieseling,' which I get on my BN2 as well). I'm not totally
comfortable with dropping the clutch in gear to stop it, and any
performance improvements would be a plus. It just so happens I just
caught an episode of 'Engine Masters' on MotorTrend TV, where they
seriously reduced the rotating mass of an engine--an SBC, which is what
they mostly do--and got some interesting results: more HP and torque, as
measured on a topnotch dyno. The gains were shown primarily on
acceleration which, intuitively I suppose, were greater when RPM was
raised at 300RPM/minute vs. 600. Any constant speed increases weren't
addressed as far as I could tell.
The late, great Gary Andersen, who raced, said the main benefit was
faster spin-up for rev-matching downshifts; anyone noted any other
significant benefits? The 'Dyno Master' on EM said he'd seen timing
chain failures with lightened flywheels; my main concern for both my
Healeys has been reliability, with minimal maintenance required, but if
it stops/minimizes the run-on I'd be happy. Anyone know how far you can
go lightening without adverse effects?
TIA,
Bob
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