"stol" wrote in message
oups.com...

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Look close at the Lyc / Cont cranks and you will see balance marks on
the rod throw end. As you have pointed out they don't have counter
weights so thats the only logical place to correct a large imbalance
that happens during the crank forging process.

Yes, you have noticed the factory and aftermarket balance marks. Have you
ever checked the depth of material removed? How deep is the nitride layer
usually?
What do you do about the bifilar dampers that most higher horsepower
crankshafts have?
It is a misnomer that these are commonly called crank counterweights.
You install new bushings and rollers? Do you balance with them
installed on the crank? What about a Lycoming ring gear?

btw, thanks your three posts in "setting me straight".

Kent Felkins
Felkins Aircraft Ltd.
FAA CRS WNKR918K
Tulsa Oklahoma