Piston to wall clearence?

[TTA850]

What should minimum and maximum piston to wall clearence be on a .020 over motor with JE Pistons?

Also,any advantages/problems with running them tighter or looser?

Thanks in advance,
Steve

 

[tminer]

Cal Hartline posted .0055 max for JE's in this thread.

HTH,
Tom

 

[Justin Terry]

Clarances are different for forged and cast or hyper pistons. Because they all expand at a different rate. But for forged it is betwen .004-.007.

 

[TTA850]

Thanks


Steve

 

[snodgrass]

My block was bored to the recommended clearance by JE. It sounds like a thrashing machine for the first 2-3 minutes of warmup, but after that, it's as quiet as could be. I might try a little em a little tighter next time around

 

[Russ Merritt]

Originally posted by snodgrass
My block was bored to the recommended clearance by JE. It sounds like a thrashing machine for the first 2-3 minutes of warmup, but after that, it's as quiet as could be.

Same here. Once she's warmed up, sounds like a well oiled machine! Little cold noise never hurt no one. I don't like to go when I'm cold either.

 

[Lee Thompson]

clearance

4.015 bore with moly coated skirts ( J & E )----.004 piston to wall clearance--quite as a stock eng. No noise on start up. After 2 season--no skirt skuffing.