While everything skye said is absolutely true, and goes for ANY car,
not just MGs, I think in the Bs case a lightened flywheel MIGHT be a
good mod. The B series engine was severely overbuilt, heavy and not
particularly rev-happy. It does, however, have torque to spare. I
don't know if I would go to the pricey extreme of an aluminum one, but
shaving the stock piece down could be worthwhiile, I think. I have no
doubt you'll get more engine vibration. How much more, I don't know.
But I think the B is an exception here. I wouldn't dare lighten the
flywheel on my neon R/T, which already revs well, and is very quick,
but has zero torque (or horsepower down low), for the very reasons
Skye mentioned.
Just like any performance mod, there's tradeoffs. You have to be very
careful if you're trying to be smarter than the original designers,
and you have to know what tradeoffs you're willing to live with.
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