Hi guys.
I have a b16a2 block that's had a 0.33mm overbore.
I've got some 81.25mm SRP pistons.

Will I be safe to turbo this engine up to 300whp?

 

Go for it. Let us know how the .08 piston-wall clearance works out.

 

measure bore and the pistons.. i think it doesent work

 

0.08mm = 0.0031".
JE recommend a 0.0025" minimum clearance.
I thought I was in spec.
Am I wrong?

 

Anyone?

 

the pistons doesnt have 81.25mm.. i think it have 81.16~81.17mm please measure the pistons!!! and than answer

 

The pistons are in the block.
I measured them 2 months ago...they're 81.25mm.
I'm not ripping apart my block unless you give me a reason why you think my pistons are only 81.16mm.
How could you presume to know this?

 

 

Pistons are typically manufactured with the skirt-to-wall clearance built in. This means that 81.25mm pistons are designed to fit in a 81.25mm bore... and the piston is actually SMALLER than advertised. As stated above, measure the piston skirt 1/2" from the bottom and subtract this value from the bore size. Anything more than .003" should be considered carefully... excessive skirt-to-wall clearance shortens the life of an engine under conventional driving conditions.

 

If the bore is 81.33mm and you put 81.25mm bore pistons in it then you should tear it apart. You more than likely have .006" piston to wall. That is wayyyy to much for srp pistons.