Will type S pistons work in an h23a? If not, are there any pistons out there that are compatible with the frm sleeves that can help me get the compression up in my H23?

 

whats the compression right now? im guessing your going to turbo it? might be wrong but why have sleeves if ur not doing any major work. and why type s pistons when u have sleeves?

 

Fiber Reinforced Metal sleeves come stock in the H-series motors. And i believe the stock compression on the H23 is 9.5:1? And this is for an NA setup. Having cams, exhaust, intake, headers, s100 and tune done shortly, and I've read that cam'd h23's respond very well to higher comp. As I'm sure any motor does really.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by one-cam &raquo;</TD></TR><TR><TD CLASS="quote">whats the compression right now? im guessing your going to turbo it? might be wrong but why have sleeves if ur not doing any major work. and why type s pistons when u have sleeves?</TD></TR></TABLE>



FRM sleeves are the OEM sleeves like he said.

Dabryby have you looked into the Mahle FRM compatible forged pistons? Also, check out some of the hybrid engine builds in the FAQs, I'm sure there's some info in there on Type S pistons in H23 blocks...

 

FRM compatible forged pistons!? No, i had not looked into that! I'll also look into those hybrid forums...would be nice to just pick some out of an older engine or get some from someone who is parting out. But jeez, frm forged pistons...dunno why i never though to google that in the first place

 

i misunderstood and thats my fault i thought he stated it was sleeved

 

type-S pistons will work. H22's and h23's have the same bore.....more or less...the whole A/B piston size comes into play.

CHECK the FAQ's for the prelude forum...there's a whole thread that lists the sizes, and what fits where. Its mostly all been done before


https://honda-tech.com/zerothread?id=1482111

 

Yeah, getting some higher compression pistons would be great..specially considering i could prob save a ton of money by just getting some h22 or Type S pistons. Ty for the info all

 

By the way...Can the USDM H22 pistons be used with the stock H23 rods? Anyone also know if having H22 pistons on H23 rods will be able to clear the valves?

 

if you use A1 or A rods, they will work without modification as they both possess pressed in wrist pins. But if you use pistons that have previously had the piston wrist pins pressed out, i would have a machine shop inspect the pin housing and to make sure it is within honda spec.

you will need to clay the pistons to have a definite answer on clearing the valves.

 

Alrighty, thank you very much for the info 98. You've helped me out on multiple post before lol

 

get familiar with this thread:
https://honda-tech.com/zerothread?id=1232811

 

wrist pin location on an H22 and H23 piston are totally different. if your going to use h22 pistons with h23 rods you will stick out the top of the deck. hence the clearance issue. h23 wrist pins sit higher up into the piston compared to h22 pistons. plus the length of the h23 rods are longer than the length of the h22 rods.

 

So how about H22 pistons and rods in an H23? Whole reason I'm looking into this is to get some higher compression to complement a more aggressive cam set up. I read that anything higher than 200 degree and .400 lift won't show that much without higher compression pistons. Would hate to spend the money on stage II cams and valve train to just get the same effect of stage I cams with no valve train.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec &raquo;</TD></TR><TR><TD CLASS="quote">get familiar with this thread:
https://honda-tech.com/zerothread?id=1232811</TD></TR></TABLE>

the h23 rods are shorter than h22 hence the lower r/s ratio. Get acquainted with the thread i linked.

the pistons can sit out of the deck a little without running into issues.

mine were .020 out of the deck and a i have a 6cc dome and i have no clearance issues. I'm also running a .051" head gasket.

 

did u even read either of the links that were posted for u???????

 

yeah but doesnt really matter anymore lol, decided to junk that whole project and just throw like 8lbs of boost on it. might do some of Mahle pistons that are compatible with the frm sleeves, might just risk it with stock internals an go a lb or two lighter on the boost. That is a great thread though...i'll prob still use it later on down the road

 

make sure u find a good tuner.
tuning is gonna be THE MOST important part in making ur motor last, and make decent power safely