spives

Guys, I've got my new Wossner pistons, crank, flywheel, and clutch parts for my rebuild. The Wossners are a bit heavier than the original pistons so my instinct is to have the rotating assembly balanced.

Is there anything special to consider regarding the balance shafts? It seems that they would be tailored to a fairly specific range of piston and rod weights. Will they still function as intended if I reduce my reciprocating mass with heavier pistons?

Dave W.

Theoretically you should match the heavier pistons with heavier balance shafts. Since there aren't any balance shafts available that are heavier than stock, the best you can do is to keep using the stock shafts.

rlm328

Are building for the track or the street?

spives

It'll be 90% street driven. I've got a fresh K27/6 to put on and it'll be running Megasquirt. I'm focusing on mid-range but I'm sure it'll see the red line fairly regularly.

rlm328

Go back with the standard balance shafts.

spives

Cool, that's the way I was leaning.

Think it's worth balancing the crank for a fairly mild engine like this? There were no issues with the bottom end before the timing belt let go. I'm not really chasing any problems with this rebuild, I just want to be thorough.

fortysixandtwo

Unless you're on a tight budget now would be the time to have the crank balanced. It does make the engine run smoother when balanced down to zero grams vs the factory spec.

kev951

I think broadfoot racing sells lightweight ones. but i deleted mine with my race build.