I wish to replace the pisrons that are in my H22A engine for the Type-S pistons however, I have not been able to note why these piotons are either "A" or "B" with no other specs. Not even the people at Honda.

Can anyone enlighten as to the differance.

Thanks.................. Mike4

 

just like you figure out bearing sizes the pistons have different sizes as well for
h22a. You need to get the numbers off the block to figure out which pistons you
will need.

 

Okay !, looks like I need to take the intake manifold off to read them latters.

Thanks........ Mike

 

need to take the HEAD off the block

 

if youknow for sure the block has not been re-built ,you may want the .25 over pistons and have the block overbored to fit them.just tomake sure the rings will seat good.

 

The engine has never been rebuilt however, I've been told that the H22A engine would have to be resleeved if I went to the over-sized pistons. Though that may not be a bad idea however. Any good market for a set good set of liners ?.

Thanks............... Mike

 

Honda sells .25 over pistons so I'm assuming that there's a provision for the stock sleeves to be bored out a tad.

The issue with the sleeves is they're made of a material called FRM which is mostly aluminum. You can't use aluminum pistons with these sleeves. The stockers are actually coated with iron to interface with the sleeves properly. As long as you stick with OEM pistons the stock sleeves should present no problem.

 

You should be able to see a machined surface near #1 cylinder on the firewall side. If you have B pistons already, there will be a B stamped on this surface. If the surface is blank, you have A pistons. You don't have to pull the head or the intake to see it. You might have to clean it with some brake cleaner to read it though.

 

yup yup, never understood all the stuff they "try out" on the h's

 

I thot i was wrong, and just flipped thru my prelude manual. you beat me to it tho

 

I was hoping against hope that I could see what pistons I've got in this engine before thking the head etc., off.

Thanks for the assist..... Mike