I am currently building a G23 (H22 head, F23 block). To achieve a desired compression ratio, I decided to use Honda K20a3 pistons. I got them in today. They have this weird raised bowl on top of the piston. The spark plug will fire in this bowl, but its off center. Does anybody know the pourpose of this bowl? Its very peculiar.

 

not sure which bowl your referring to. Picture? Tomorrow I'll go look at some pistons I have lying around my shop

 

Yes pictures would be good I'd like to see this as well

 

Did you have a chance to check out those pistons?

 

No dice on the help? Im running these pistons anyway. I figured an EP3 guru would know about this piston.

 

Take a photo, its probably the casting marks

 

OK. A photo is on its way. But it "aint no" casting mark.

 

i don't know the exact purpose of the bowl but i do know its normal. could have been just an easy way to reduce compression.

 

I think "the bowl" is designed for fuel efficiency, to create a better "swirling" effect inside the bowl to ensure the air/fuel mixture is burned completely.

From an article posted here: http://www.circletrack.com/techartic...ogy/index.html