I've read the stickies and all the links but still can't find hard evidence on H-series parts compatability. I'm building a backup h22 from oem parts and wanted to know are all H-series parts interchangeable. I want to do a real basic oem ATR 11:1 pistons, ATR or S cams, and ATR intake manifold, nothing else.

Are all H22 heads from the same stamp, and are all open and closed deck blocks from the same stamps, are all h22 cranks, rods, valvetrain the same??? Can you get oversized Accord type-r pistons (specifically .25 over)

for example, 99-00 si heads are the same pr3 heads as the dc2 type-r minus factory P&P, GSR heads are from a different stamp, but all parts are interchangeable. Does this hold true for the H22 series?

Mods if we get so good info in here could you please sticky.

 

ttt

 

h22a1 cranks and certain h22a4 cranks are different. Type S pistons are available in oversized sizes. I don't know about atr pistons, but that's irrelevant as far as I know, since you can use type S ones. Type S heads are different than H22a1 heads, which is why a type S motor has 11;1 cr, while an H22a1 with type S pistons has 11.5:1 cr. You can use type S cams in an H22a1 head, but there are much better options to use.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by laughinxxx &raquo;</TD></TR><TR><TD CLASS="quote">h22a1 cranks and certain h22a4 cranks are different. Type S pistons are available in oversized sizes. I don't know about atr pistons, but that's irrelevant as far as I know, since you can use type S ones. Type S heads are different than H22a1 heads, which is why a type S motor has 11;1 cr, while an H22a1 with type S pistons has 11.5:1 cr. You can use type S cams in an H22a1 head, but there are much better options to use. </TD></TR></TABLE>

what's a h22a1?? (4th gen prelude)??

I was under the impression that atr and s pistons were different, since both yield 11:1 i'll opt for the oversized S since there easier to get a hold of. how are the s head different? i've done research and have found it to have the following changes:
factory P&P
revised intake chamber
cams
other than that i thought everthing else was the same. what causes the h22a1 to yield 11.5:1? valves, milled head????

 

h22a=jdm
h22a1=usdm 4th gen
h22a4=usdm 5th gen

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by georgiajdm &raquo;</TD></TR><TR><TD CLASS="quote">I've read the stickies and all the links but still can't find hard evidence on H-series parts compatability. I'm building a backup h22 from oem parts and wanted to know are all H-series parts interchangeable. I want to do a real basic oem ATR 11:1 pistons, ATR or S cams, and ATR intake manifold, nothing else.

Are all H22 heads from the same stamp, and are all open and closed deck blocks from the same stamps, are all h22 cranks, rods, valvetrain the same??? Can you get oversized Accord type-r pistons (specifically .25 over)

for example, 99-00 si heads are the same pr3 heads as the dc2 type-r minus factory P&P, GSR heads are from a different stamp, but all parts are interchangeable. Does this hold true for the H22 series?

Mods if we get so good info in here could you please sticky. </TD></TR></TABLE>


how do you ask all this stuff and then you dont even know what an h22a1 is? I'm confused

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by laughinxxx &raquo;</TD></TR><TR><TD CLASS="quote">Type S heads are different than H22a1 heads, which is why a type S motor has 11;1 cr, while an H22a1 with type S pistons has 11.5:1 cr. </TD></TR></TABLE>

whoa, is that true?

So I'm assuming they took some material out of the head's combustion chamber?!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Nick M &raquo;</TD></TR><TR><TD CLASS="quote">


how do you ask all this stuff and then you dont even know what an h22a1 is? I'm confused</TD></TR></TABLE>

cause i wasnt' specfically looking for 4th gen stuff, more specifically the a4, s, atr, euro

i know all usdm engine have numerical numbers following the last letter so i guessed 4th gen.

 

dp

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LudeyKrus &raquo;</TD></TR><TR><TD CLASS="quote">

whoa, is that true?

So I'm assuming they took some material out of the head's combustion chamber?!</TD></TR></TABLE>

No it's not...Type-s pistons in am H22a block are 11:1 same...

taking material out of the combustionchamber would descrease compression...the only ported the head.

 

H22A

1. All H22a cams are compatible and all other head components
2. All H22a pistons are compatible in all the FRM blocks
3. 4th gen JDM H22A and USDM H22A1 rods are press fit pins
5th gen USDM and JDM H22a's are floating pin design, thus 4th gen rods are not compatible with 5th gen pistons including type-s unless you rebush them.
4. JDM H22a and USDM H22A1 cranks as well as the 97 H22A4 cranks are compatible as they use 50mm mains for the block. the 98+ H22A4 increased to 55mm mains, and thus are ony compatible with those blocks.
5. All H22A rods big ends are compatible with all H22A cranks

That's all I can think of right now

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by satan_srv &raquo;</TD></TR><TR><TD CLASS="quote">

No it's not...Type-s pistons in am H22a block are 11:1 same...
.</TD></TR></TABLE>
Oh damn, I was thinking of type S pistons in an H23VTEC wasn't I?!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by laughinxxx &raquo;</TD></TR><TR><TD CLASS="quote">
Oh damn, I was thinking of type S pistons in an H23VTEC wasn't I?!</TD></TR></TABLE>

yeah, that's what you were thinking. H23 block = moredisplacement so slightly higher CR

 

ttt

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by georgiajdm &raquo;</TD></TR><TR><TD CLASS="quote">ttt</TD></TR></TABLE>


ttt of what? I just answered every question for you above. What other pieces are you wondering about.