In my case the counterweight mass is determined by how much clearance I needed. I expect I'm paying a penalty of increased crank bending and main bearing loads compared to a stock 292. Hopefully offset somewhat by lighter pistons. My rods probably weigh about the same as 292 rods but my pistons are much lighter at 403 grams. Don't know what stock 292 pistons weigh but I would not be surprised if they are 700 grams.
This is likely the biggest reason for the change from 6 weight to 12 weight cranks. Reduce main bearing loads and improve crankshaft durability.
I expect I'm paying a penalty of increased crank bending and main bearing loads compared to a stock 292. Hopefully offset somewhat by lighter pistons. My rods probably weigh about the same as 292 rods but my pistons are much lighter at 403 grams. Don't know what stock 292 pistons weigh but I would not be surprised if they are 700 grams.
