Ok, I need information from 'the masses'

I'm rebuilding, because my head gasket blew. I have a JDM H22A and I know JDM's usually have thin head gaskets, rather than the USDM H22's.

I want to bump up the compression and I'm going to mill the head, but I also would like to KEEP the thin JDM gasket that it originally came with.

I've been getting alot of opinions and suggestions of which way to go with this.
-Spoon is discontinued=so that's out of the question
-Cometic makes OEM thickness and thicker(but I have to call to ask for a thin one?)
-OEM = I've heard taking out a layer (I'm very skeptical about that idea for proper sealing issue)

I am just so confused, Which would be THE SMARTEST way to build this, please?
All comments, suggests, advise, and opinions are welcomed

 

Are you sure the jdm motors got the bump in compression through a thinner headgasket. I was under the impression that they use the same head gaskets, but the pistons make the .6 bump in compression. If this is true that sucks bc i used a oem headgasket. So now my .020 mill brought me back to were i started.


Modified by matix at 7:49 PM 11/24/2005

 

Will this do ? http://cgi.ebay.com/ebaymotors...wItem

 

the information that i've heard lead me to believe what you believed.

so i want to make sure , so i dont do extensive work here that cancels each other out

so if this can be confirmed that would be great

 

I would also like to know the answer to his questions.

 

jdm motors come with the exact same headgasket from the factory....whether your specific one came with a thinner one or not i dont know

jdm motor and stock head gasket is 10.6:1 vs the usdm 10:1 due to a larger piston dome

headgaskets=the same

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">
jdm motor and stock head gasket is 10.6:1 vs the usdm 10:1 due to a larger piston dome

headgaskets=the same</TD></TR></TABLE>
Thanks for clearing that up!

 

so i guess this leaves me with the conclusion to mill the head and use OEM gasket, to answer my original question?

 

yes use the oem headgasket and mill if you must....i think thats stupid but its up to you....

if it was me i would get flat face valves before i milled a head....

 

is it really a stupid idea to mill the head because i want to ensure that the head has no warpage?

 

Besides millin the head, whats the best way to bump up the compression guys? I am looking at gaskets and like he said, they are telling you to call for thinner ones, which makes no sanse. So what exactly the best thing to do?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AznPimpS &raquo;</TD></TR><TR><TD CLASS="quote">is it really a stupid idea to mill the head because i want to ensure that the head has no warpage?</TD></TR></TABLE>
Use a straight edge and check your manual for the #'s.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EOE &raquo;</TD></TR><TR><TD CLASS="quote">Besides millin the head, whats the best way to bump up the compression guys? I am looking at gaskets and like he said, they are telling you to call for thinner ones, which makes no sanse. So what exactly the best thing to do? </TD></TR></TABLE>
A thinner head gasket will bump compression. Flate face valves, pistons, or mill the head. Try to stay away from milling the head bc its permanent.

 

Look into having the chambers welded, it adds material inside the combustion chamber to decrease cc size of the head resulting in an increase in compression.

 

 

i have my head milled .015 for a .6:1 bump.

getting the compression chambers welded seems like news to me, scary too but working used heads are only $500 so what the hell.

 

I must admit, I dont know much about it, haven't looked into it much. It is more detonation resistant than milling the head. Not sure about the costs, I imagine it would cost alot more than milling the head. I think PirateMcFred knows more than me about this sort of thing.

 

i'd assume welding in the combustion chambers is more for muscle cars or cars with 2-3 valves per cyliner, i dont know where i'd add material in my H22 head, that thing is so crammed with valves already!

 

I've seen pics of it done on a Honda cylinder head, not sure which one it was though. I'm thinking this would probably cost as much as an OEM set of higher compression pistons (like Type-S), so it might now be worth it, maybe that's why its not so common in Hondaland?

 

makes sense. type-S pistons are really the way to go, if you're not wanting to take apart your bottom end, i'd say just mill the head, another head is only $500 and you can sell the fucked up one for a little less to someone doing a weird project.

i sold my last blown head for 300, and got the currnt one for 500. no big deal there.

 

i know how to check for warpage. done a few here at my shop that i work at.
let say "worst case scenario" head is warp, now i have no choice. what CONS am i looking at in the future, besides the fact that it raises the compression?
it seems like i'm being persuaded to say away from milling without any explaination or reason why?


Modified by AznPimpS at 6:29 PM 11/26/2005

 

price is not a thing for me, because i work at a shop and i have the benefits of having all my work done at 'cost' rather than average retail.
i just want to make sure this job goes right the first time around without doing a Complete Rebuild(meaning touching+/or replacing OEM valve train)


Modified by AznPimpS at 6:58 PM 11/26/2005

 

Modified by AznPimpS at 6:39 PM 11/26/2005

 

what about takin a layer out of the oem headgasket??? What issues would arise???

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cb7-R &raquo;</TD></TR><TR><TD CLASS="quote">what about takin a layer out of the oem headgasket??? What issues would arise???</TD></TR></TABLE>

i've heard with this idea there are sealing problems it not 100% sure that it will seal properly. but i've never seen real facts about this issue?