Crank????

[4g63t]

I just got new wiesco pistons and eagel rods. SHould I get my crank groud down if I havent spun any berings? Could I just Put stock berings in the new rods? and not worry about the crank. Or should I have them grind it or what ever they do, when they are boreing my block. Im just looking for the cheeper way.

 

[vintagemuscle]

Take the crank to your machinist and have him mic it. If it is still within spec have him polish it and use the standard size bearings. If it has excessive runout or scratches on the journals either have him turn it and use oversize bearings or toss it and find a good crank. Personally i wouldn't run a turned crank in a built engine but many have done it without problems.

 

[JayRolla]

Ive done it, why wouldnt you run a turned crank, because it weakens it. Ive never heard of that, but I can see it making it weaker I guess. I was told by a machinist, after I already had it done, that you cant regrind the crank and cams because the metal is too soft. He said he build many mitsubishi's and its impossible. What would make him think this when they make performance regrinds now?

 

[ROOKIE1]

I just got new wiesco pistons and eagel rods. SHould I get my crank groud down if I havent spun any berings? Could I just Put stock berings in the new rods? and not worry about the crank. Or should I have them grind it or what ever they do, when they are boreing my block. Im just looking for the cheeper way.

Like they said have it checked with a mic . If it is within specs it can be ground . The problems happen when it is taken past spec or not done by a professional .

 

[vintagemuscle]

Ive done it, why wouldnt you run a turned crank, because it weakens it. Ive never heard of that, but I can see it making it weaker I guess. I was told by a machinist, after I already had it done, that you cant regrind the crank and cams because the metal is too soft. He said he build many mitsubishi's and its impossible. What would make him think this when they make performance regrinds now?

Really, just for peace of mind in knowing that i have a solid crank. In a non performance application i don't see a problem in running a turned crank. Mitsubishi does state however that the 4g63 crank is non servicable. I know people will probably chime in here and say i have a .030 under crank and have put down 786.4whp, but i really don't care. This has been discussed many times on this board and it usually is a 50/50 split in whether or not to use a turned crank.

 

[4g63t]

hmmm so i should? well i have 2 cranks so ill take them bolth in and see wich one will need less work.

 

[Defiant]

Mitsubishi says the crankshaft is not a serviceable item. Grinding destroys the surface treatment.
Do what you want. We've discussed this many, many times, and in more depth than a surface treatment.