I have a question it might seem like a stupid question but I am building a h22 and I have been looking at ways to lighten my rotating assembly the question I have is has anyone ever machined off the the second third sixth and seventh counter weights I mean if you cut them off it would still be balancable and I can't see how it would weaken the crank any I mean Honda did it with the k20 crankshaft so I don't see what it would hurt to do it to the h22 crank does anyone have any knowledge of weather or not it would hurt to do this or not

 

talk with your local reputable machine shop

 

Honda ADDED counterweight to the B16B crank to help it rev higher.

Just food for thought.

 

If you are just looking for more RPM, then run an F20B crankshaft with applicable rods for your pistons. They will rev to 9k+ easily.

If you want to reduce reciprocating mass, delete the balance shafts and run a lightweight flywheel. The balance shafts are ~18lbs, and you can lose another 15lbs depending on the flywheel and clutch assembly. This is a much more significant loss of mass than you will get from shaving the crank. You will find these engines spin extremely fast and freely after just these 2 mods.

The lightest H/F series crank from Honda is actually the H23A blue top crankshaft at 34lbs, followed closely by the F20B crankshaft.