Well, I sent my block to the machine shop and they go very loose on the clearance.

B18C1 - CP Pistons - 9.0:1

P/W 0.005
1st Ring 0.022
2nd Ring 0.031
Oil Ring 0.028

What now ??

1. Oversize Pistons
2. New Sleeves
3. leave it and see what happen

Opinions.


Perdon por mi ingles.

 

since when was a piston to wall clearance of 0.005 loose?

 

thats fine for boost..alot of people run .0055 and .006 for boosted engines.

 

I was reading the most people use 0.003 to 0.004

 

people running 300-400whp usualy run .003-.004 people running higher boost and 500-700whp go .0045 to .0055...looser is better allows piston more space to expand..yo can run higher boost...im running .004 on an allmotor build...so you should be fine..

 

Thank you guys, you give me great news.

I was disapointed.

 

my DD and race car are over .005" PTW. I'd loosen up that top ring a bit though