[AMC-list] AMC factory engine balance

[tom jennings <tomj@xxxxxxx>]

Does anyone know how AMC actually balanced the engines, and of course for my
interests, the 196.6 ohv? I assume they balanced components separately --
flywheel (manual trans), crank, mainly -- to some spec and just assembled
the motors from there.

The crank, flywheel and front damper are all drilled, so some balancing work
was done. It seems most unlikely than any production motor had it's whole
reciprocating/rotating assembly balanced.

Does anyone have any idea to what spec this was done? The flywheels and
dampers I assume are neutral, just make them spin evenly. But the cranks had
to be balanced to accept the "average" weight of the corresponding rod, pin
and piston, right? I can picture a standard bob weight attached to each
crank throw then spun balanced for zero, but more likely they spun them for
a known amount of "error" vibration that would happen without the rod and
piston. Or is that too sophisticated for the 1950's/1960's?

Whatever they did it was just nominal I know, but some balancing was done.
Just curious how it was arrived at.
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