Re: [AMC-list] AMC factory engine balance

[Joe Fulton <piper_pa20@xxxxxxxxxxx>]

I have a factory new short block 348 V8 which has A B C and D on the piston tops in ink marker.   A assume these are weight ranges, but the pistons are not paired or "matched" across from each other on the block with the same markings.   The short block did not come come with a balancer.  I can flip the engine over on the stand tonight and look for balance marks (drilled spots on the counterthrows) on the crank.  

Joe Fulton

--- On Fri, 2/19/10, tom jennings <tomj@xxxxxxx> wrote:

> From: tom jennings <tomj@xxxxxxx>
> Subject: [AMC-list] AMC factory engine balance
> To: "AMC, Rambler, Nash, Jeep and family" <amc-list@xxxxxxxxxxxx>
> Date: Friday, February 19, 2010, 12:30 AM
> 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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