So, how is the balancing of these engines carried out, are weights added or shims used? I understand the precession of placing things back where they came from with the allowable tolerances but what actually is being balanced the crankshaft, pistons, camshafts??[/QUOTE]
Ideally most balancing can be accomplished by removing material from a heavy area to match the lighter areas. With pistons & rods each part is weighed individually to find the lightest part & then material is machined off to lighten the part until it weighs the same as the lightest part. With M96 engines the only part I have had to add weight is the pressure plate since there are few places to remove weight. Seems to me the flywheel & pressure plate are the biggest source of imbalance.
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