welding balance weights

And to add, it's a cast crank. You probably won't be reselling it if used for racing purposes.

Paul Kane wrote:

rmk57 wrote:I've never seen a crank balanced like this before and would some expert opinions on using this up to 6500 rpm.  It's a 4.15 cast Scat crank.

If it's correctly balanced and that's where the weight was needed then it's perfectly fine for your appplication and a complete non-issue.


Which parts (piston/rod) were used for the rest of the rotating assembly, and exactly how old is the crankshaft?

The crank was brand new.
Scat I-beam rods and SRP -28cc pistons.

I'm probably going to go ahead and use it as is. It just isn't what you expect to see when you unpack your new crankshaft.

The other weld which looks prettier than the other one and a copy of the balance card.

cranks get welded on all the time. One of the ways to repair a journal... weld, and turn back down. Original offset stuff,, add weld and move center.. Back in the stone age of this sport, China didn't cast one of every stroke out there. People remanufactured what was available.

We would weld in the Mallory slugs in the throughs..

To be fair i have seen a lot uglier work

Some major Swiss cheese drilling and I do recall a mopar crank once with nuts welded to it in a number of places......

I would not put that in any engine with my name on it.. "if" it comes off, it will do major damage to a lot of stuff, I won't even let a balance shop end press weight (radially).. also, that is mig welded, tungsten to cast with er70.... nope.