darkspector

I plan on building an h23/vtec and running a jrsc. would I want to keep the h23 pistons for the lower compression or would it be ok to run with the type-s pistons or the jdm h22 to bring my compression up. I'm not sure on the compression ratios that come out of mating that block and head so that's why I ask.

T-King

Since the h22 does i have a bigger combustion chamber chamber i would run some 10:5:1 or stock h22 size for drivability reasons but if your building and all out very little street stip monster go with the 11:0:1.

2point6

Save yourself some hassle and build the engine right from the start. Sleeve and use aftermarket pistons... if you don't build it right the first time, you will end up doing it sometime.

darkspector

I want daily drivabilty nothing too monstrous where it's work to drive and just not worth streeting. Do you think i'd still have to sleeve the motor with the regular 6psi pulley. I'd like to stay as stock as possible, but I could see in this case where you would want to run better pistons. I'm not sure but to run forged youd probably have to sleeve anyways right? FRM sleeves + forged pistons = bad?

sharkcohen

I'm not certain, but you may run into issues with certain brackets in the JRSC kit not bolting up on the H23 block.

97Preludeguy

Yep, for forged pistons you would have to run sleeves. Mahle makes some forged (some people say they are semi forged???) pistons with an FRM friendly coating on them, so you wouldn't need sleeves, but I haven't heard of too many people using them, so I'm not sure how well they really work...

vinuneuro

you could always use f series pistons?

chihuahuamanx

from the h23/vtecs ive seen the compression is dropped from what the h22 would be running (ie a head from 10:1 h22, when used to create the h23vtec w 10:1 pistons for the h23 will end up running around a 9.8 or 9.9)

the h23 block is identical to the h22 block so bolting it up to the jrsc wont be a problem. THEYRE THE SAME BLOCK! it says it allllllll over this forum, and i have an h22 and h23 block side by side im my garage and theyre identical.


out!

Shakes

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sharkcohen &raquo;</TD></TR><TR><TD CLASS="quote">I'm not certain, but you may run into issues with certain brackets in the JRSC kit not bolting up on the H23 block.</TD></TR></TABLE>

most likely this is going to go into a 4th gen / or the crx that he has parts for sale for; so it will already be a complete custom job, so i doubt that will be an issue.

sharkcohen

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by chihuahuamanx &raquo;</TD></TR><TR><TD CLASS="quote">the h23 block is identical to the h22 block so bolting it up to the jrsc wont be a problem. THEYRE THE SAME BLOCK! it says it allllllll over this forum, and i have an h22 and h23 block side by side im my garage and theyre identical.</TD></TR></TABLE>
I wasn't sure that every single bolt hole was identical between the two, was just mentioning the posibility to help out.

Shakes

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sharkcohen &raquo;</TD></TR><TR><TD CLASS="quote">
I wasn't sure that every single bolt hole was identical between the two, was just mentioning the posibility to help out.</TD></TR></TABLE>


yeah, whatever. postwhore

darkspector

nawww... its for a 4th gen... my crx sadly died... but in a way i'm glad it went out with it's dignety instead of putting that ricey kit on it. those are days long gone thank god. I'm doing a real motor build soon and i just want to find out what needs to go into it to know how much to expect to save up for money. I really want to get a nice motor out of this. but without breaking the bank it's not my priority in life. but sittin at 300hp would be a nice treat. especially to beat my friends sc400 he loves so much . He races me and says haha you lost! well I guess I should make fun of him for driving a corolla the lexus is his moms car.

sharkcohen

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Shakes &raquo;</TD></TR><TR><TD CLASS="quote">yeah, whatever. postwhore </TD></TR></TABLE>
Who, me??? :angel:

sharkcohen

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by darkspector &raquo;</TD></TR><TR><TD CLASS="quote">300hp would be a nice treat. </TD></TR></TABLE>
If you were to get the blower modified by Endyn, find some way to adequately cool the intake charge (water injection? convince LHT to design an aftercooler for the H22 kit?), and run 12 psi, you could possibly get 300 whp out of the setup. Oh if only I had money

Shakes

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by darkspector &raquo;</TD></TR><TR><TD CLASS="quote">nawww... its for a 4th gen... my crx sadly died... but in a way i'm glad it went out with it's dignety instead of putting that ricey kit on it. those are days long gone thank god. I'm doing a real motor build soon and i just want to find out what needs to go into it to know how much to expect to save up for money. I really want to get a nice motor out of this. but without breaking the bank it's not my priority in life. but sittin at 300hp would be a nice treat. especially to beat my friends sc400 he loves so much . He races me and says haha you lost! well I guess I should make fun of him for driving a corolla the lexus is his moms car.</TD></TR></TABLE>


hate to tell ya man, but i dont see 300 fwhp out of that setup. if that is really what you are looking for then buy firedrakes complete turbo kit for 5 grand, slap it on a stock h22 and you will be sitting at 350 whp for about 7 grand total.

darkspector

alirght alright maybe 300 hp is a little over zealous but whatever it makes I've seen dynos of the h23 vtec that made what 180 plus however much the jrsc adds... not tooo sure but at least over 200 whp much better than the stock h23 i'm sittin at now... I don't need to run laps around brian l spillner but I want to sit there with a smile on my face

Greyout

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by darkspector &raquo;</TD></TR><TR><TD CLASS="quote">the jrsc adds... not tooo sure but at least over 200 whp </TD></TR></TABLE>

it adds more like 80whp

darkspector

sorry bout my punctuation... but i meant that with the jrsc and the h23 vtec I would be over 200whp, not that it adds 200whp. and since you say it's 80whp I'd have to say sitting at 260whp roughly and that's without anyother mods such as i/h/e not that it adds a LOT but it helps. I'm only approximating here also, BUT i would have to say 260whp would make me more than happy, and also broke from all the tickets I will get, as if the build won't do that itself.

But you say if I use the h22 pistons that will put the compression at about where I sit right now. Since the JRSC was built for the higher compression of the h22 would I loose performance. Could I use a higher boost pulley and be safe?


Modified by darkspector at 10:41 PM 3/29/2005

Greyout

H22 pistons w/ an H23 stroke will put you well above 10:1

Taikonaut

Taken from the H23/VTEC thread

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by satan_srv &raquo;</TD></TR><TR><TD CLASS="quote">I have to stress piston selection here. You have an H22a sized combustion chamber, but you have a H23 stroke. So therefore any H22a piston you put in an H23 VTEC will have a HIGHER COMPRESSION RATIO because of the displacement. Like this

USDM H22a piston 10:1 = becomes approx 10.4:1
JDM H22a piston 10.6:1 = becomes approx 11:1
JDM H22a type-s 11:1 = becomes approx 11.5:1

So pay attention, consequently an H23 piston in an H23 VTEC is more like 9.3:1 CR cause of the larger H22a combustion chamber
</TD></TR></TABLE>

As for boosting more, I thought I read somewhere on here that someone was using the H23 crank pulley or whatever and was able to boost up to 11psi or something like that. Don't quote me on that, but I thought I remember reading it.

darkspector

damn I saw that but I got it backwards I thought it lowered the compression... well I guess it raises the compression of the original but anyways... now that that's settled I guess... I just want to know if I can run stock pistons safely even though I know people are giong to say buy forged and be SAFER!

darkspector

bump