Quote:
Originally Posted by rotrex
positive displacement superchargers can be very noisy.
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Yes. My s/c is a "short nose" version and the pulley is mounted directly onto
the end of the rotor shaft. It is common for "long nose" versions from many
manufacturers to have a coupling with an resilient element between the
pulley and the rotor shaft. The coupling absorbs a lot of the pulsations that
would otherwise be transmitted from the crankshaft to the rotor shaft. This
reduces (damps) harmonics and gear rattle. But it does introduce another
item requiring maintenance into the s/c installation.
You can clearly hear gear rattle from my s/c when warm at idle. But it does
start to make a satisfying whine when the engine gets up to 6000rpm and
the gears are no longer rattling
Cheers... jondee86