Im getting ready to clay my motor again and i was just wanting to see what you guys think is a safe piston to head. Setup is a h22 with f22 crank and rods arp rod bolts h22 type s (oem honda not nippon) pistons and a cometic .040 gasket. That should put me around .020 piston to head. I think thats to tight should be around .035 to .040 right?

 

https://honda-tech.com/forums/showth...2474967&page=6

here's and idea that might work for you from a pro

 

.020" should be good. You don't want it too far away or you will lose your quench.

 

Just dont want my head to look like this. Just wanted to get some opinions

 

Looks like the pistons were in the right way on that engine. lol

0.020" is probably enough, as long as you have that everywhere. If the piston has a high spot, like the "IN" in your picture, then that can be knocked down flush with the surface. Stock H22 chambers don't look like your picture, so make sure the corners of the pistons also have clearance where they get close to the recessed chamber in the H22 head.

 

it depends how high you are revving. IIRC at 8krpm rods will stretch .030-.040"

 

Thats what i was woried about was rod stretch. Yea thats the way my head looks. My quench pads have been welded and then the head resurfaced so my quench pad is now my head

 

good info

 

Went to clay my motor today and my rod is hitting my block at the bottom of the cylinder. It happeneds a few degrees before tdc. This happen to anybody else?

 

depends on rod material... the stretch @ x rpm that is

 

And how much the piston crown grows at temperature, thats the biggie.

 

growth ftw LOL


id listen to this man by the name donF

so i will stick to what he suggested to me 0.039-0.040"