Anyone know what the stock piston to wall tolerance is for an ITR? also what is the ring gap?

 

piston-wall clearance .0006-.0014"

 

Thanks SGT... I'll let the kid know!

 

I could be wrong, but that sounds a wee bit snug. The spec on my JE's is .003". I thought the stock B18C1/5 spec was around 0.0015" the last time I looked, but I will have to check the S.M. tomorrow.

 

is it true that with a looser piston to wall clearance there is more wear on the wall and rings?
I heard it was a common thing with FORGED pistons that are low silicone and that do expand a lot when the temp goes up that is why they HAVE TO run a looser piston-to-wall clearance.

please educate me on this.... even though sorta off topic

 

anyone know the ring gap for factory pistons?

 

That piston-to-cylinder wall clearance isn't too snug for factory pistons. It's what the manual specifies.

Ring end gaps:
Top: .008" - .014"
2nd: .016" - .022"
Oil: .008" - .020"

 

Silly me, I should never have doubted SGT.
Service manual: Standard 0.0004-0.0016"
Service limit-0.002"

SGT is the man.

 

Forged pistons swell when they get hot. OEM pistions don't as much so with OEM slugs you can run tighter piston to cyl wall clearance without the piston seizing.

ADDED: Also a bigger piston say 84mm will require larger piston to cyl. wall clearance than 81mm.


[Modified by Phat_Optimo, 10:41 AM 3/19/2003]