engine balance

Posted by Dave Munger On 2013/3/23 17:10:19

I'm rebuilding a 282", 15th.series. New forged pistons were made, they weigh 674.1-672.1 grams, the Packard manual states, " pistons in any one engine should not vary in weight more than 4 grams or 1/7 oz." The rods have been rebushed & the big end resized ( shop said cleanup &
true round) , NOS original style standard size bearings, the maxium weight spread on rods is 6.2 g
( not weighed by % of rod ). The damper stays where it stops on V-blocks & ball bearings. The flywheel & Pressure plate were surfaced and indexed , I was told the flywheel is "Neutral Balance". The crankshaft was cleaned / polished and measured .0014 under Packard minimum spec. of 2.0934" for rod journals. The main journals measured .0003 below Packard minimum of 2.7455-2.7465" using NOS standard size main bearings.
I don't like to shave /cut any more metal than necessary from crank, flywheel, plate.
I want this Packard to run Strong, Smooth & Silent just as it did in 1937.
I would appreciate any information / ideas about rebuild, especially balance.
Thanks,
Packard 385