gpr

iTrader: (6)

I spun a rod bearing pretty hard in my LS1 motor, and the bearing ground into the crank journal. It is going to need ground and polished down probably .020” at minimum, maybe even more. Taking this much of the crank is this going to significantly weaken the crank or grind through the outer heat treated surface?

I know they make rod bearings in .030” for this exact purpose, but wanted to make sure if I go this route it wasn't going to cause issues (was planning on sticking with stock crank and forged rods and pistons as I have heard the stock cranks are very strong pieces.)

static low 92

iTrader: (2)

I just was reading a thread that mentioned anything over .010 is to much for a crank making serious power. There was a small explanation for it that I can't remember right now.


But I assume it depends on what power level goals are for the motor. I would think under 500 would be ok. But personal comfort and educated opinions would get you farther.

KCS

iTrader: (20)

Should be okay. Most of the strength in the crank is in the rolled fillets.

gpr

iTrader: (6)

Someone else mentioned this, and said as long as the radius isn't messed up i should be fine?

KCS

iTrader: (20)

Yeah pretty much. The nitriding is deeper than .010" so grinding it down .020" is no problem.

However, since you spun a bearing and the journal is already damaged, if it's cracked then it doesn't even matter. It would be junk. Your machine shop should be able to mag it for cracks.