prelittlelude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PirateMcFred &raquo;</TD></TR><TR><TD CLASS="quote">Don't mill the H22 head. You will have to mill about .040" to get the H22 head and F23A1 block to about 9.3:1 compression. That basically destroys the head and you will still only be able to push about 10psi boost that won't last long.
</TD></TR></TABLE>

agreed, taking 40 thou off of an h22 head would destory it almost. Geting after market pistons and runing 9 or 9.5:1 would work the best for you.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 89a6T &raquo;</TD></TR><TR><TD CLASS="quote">

so instead of the h22 head buy internals? i have a t4 .86 hot/.60 cold, im tryin to find a smaller hot for it but if i cant find one what cr. should i run to spool this garrett? </TD></TR></TABLE>

keep in mind its not CR that spools the turbo. cr will only effect how prone to detonation you will be in boost, and it effects your off boost driving. honestly 9:1 should be fine considering some domestic guys run 7.7:1 when boosting, thought they have 8 cylinders..

i drove my motor with 9:1 for a year without boosting it and the motor felt damn good to me. the torque that i got from the extra stroke made up the difference in power that i lost to lower c/r.

milling the head is not suggested , as the more you mill the more you throw off cam and ignition timing, as well as the more timing belt slack you have to take up.

89a6T

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


keep in mind its not CR that spools the turbo. cr will only effect how prone to detonation you will be in boost, and it effects your off boost driving. honestly 9:1 should be fine considering some domestic guys run 7.7:1 when boosting, thought they have 8 cylinders..

i drove my motor with 9:1 for a year without boosting it and the motor felt damn good to me. the torque that i got from the extra stroke made up the difference in power that i lost to lower c/r.

milling the head is not suggested , as the more you mill the more you throw off cam and ignition timing, as well as the more timing belt slack you have to take up.</TD></TR></TABLE>

so i learned something, i thought higher compression would allow the turbo to spoolfaster. and i thought cam gears and piggyback sys/standalones took care of timing if you chose to raise cr that way??

prelittlelude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 89a6T &raquo;</TD></TR><TR><TD CLASS="quote">

so i learned something, i thought higher compression would allow the turbo to spoolfaster. and i thought cam gears and piggyback sys/standalones took care of timing if you chose to raise cr that way??</TD></TR></TABLE>

see that just the thing, after you spend the money at the machine shop to get the head milled, and then you drop the money for a set of adjustable cam gears in order to dial back in your cam timing on botht he intake and exhaust , thenyour 3/4 of the way to having just bought a set of pistons and done it the right way.

most piggy backs can't adjust timing, but milling the head effects mechanical cam timing and intern effects your ignition timing because your distributor is connected to the cams

hybridpatient95

would it be a good idea to run a 1 layer headgasket? or will i have Piston valve clearence problems?

also will the head seal well like this?

prelittlelude

what is you crank/rod/piston/head combo?

hybridpatient95

its a stock f23a1 bottom end with a h22 head.. stock head also..

prelittlelude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hybridpatient95 &raquo;</TD></TR><TR><TD CLASS="quote">its a stock f23a1 bottom end with a h22 head.. stock head also..</TD></TR></TABLE>

in that case a 1 layer will not cause any pistont o head conflicts.. just make sure that you have a perfectly flat head and block when using a one layer head gasket. slight varations can cause the headgasket to not seal very well. use some copper spray with it,,

hybridpatient95

thanks alot prelittlelude.. your a big help... yea i got the copper spray ready right now.. i just plugged up my head with some jb weld cant wait to slap that mother on.. would you happen to know the compression numbers?

89a6T

if i were to get forged pistons to go high cr., would i need rods? im thinking around 12.1 in a f23 block w/h23 head.

also this setup is going in a 90 hb si(jdm sohc vtec w/si tranny as of right now), i can get my hands on a h23 tranny n ACt clutch setup,right now. would this be good for allmotor. or should i look into the h2b or Bisi adpter? (maybe better with the SI tranny?) going in a 90 hb. thanx for the opinions/knowledge.

PirateMcFred

If you got forged pistons I would reccommend 86.5mm diameter, 1.181 compression height, 22mm floating wrist pin and a 3.25cc dome that matches the H23 combustion chamber. That will get you 12:1. You would not have to upgrade rods. But ask for the piston assembly (pin, rings, piston) to be less than 350 grams.

I would just use the M2S4 transmission since you will have more than enough torque for that HB.

Pirate

89a6T

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PirateMcFred &raquo;</TD></TR><TR><TD CLASS="quote">If you got forged pistons I would reccommend 86.5mm diameter, 1.181 compression height, 22mm floating wrist pin and a 3.25cc dome that matches the H23 combustion chamber. That will get you 12:1. You would not have to upgrade rods. But ask for the piston assembly (pin, rings, piston) to be less than 350 grams.

I would just use the M2S4 transmission since you will have more than enough torque for that HB.

Pirate</TD></TR></TABLE>

what would those pistons run & where can i get them?
the M2S4 is the lsd h tranny right? if it is i heard theyre expensive n hard to find. then theres the axle binding situation with h/civic swap.

PirateMcFred

I have seen custom wiseco pistons go for ~$520

The M2S4 is the Prelude Si transmission. The nonVTEC one.

Pirate

89a6T

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PirateMcFred &raquo;</TD></TR><TR><TD CLASS="quote">I have seen custom wiseco pistons go for ~$520

The M2S4 is the Prelude Si transmission. The nonVTEC one.

Pirate</TD></TR></TABLE>

so the m2s4 is the h23 tranny? non-lsd?

prelittlelude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 89a6T &raquo;</TD></TR><TR><TD CLASS="quote">

so the m2s4 is the h23 tranny? non-lsd?</TD></TR></TABLE>

correct non lsd

hybridpatient95

anyone know the torque spec for f23 rod bolts?

PirateMcFred

If you read Prelittlelude's thread you would have found them. it even has pictures of the factory manual procedure...

Pirate

hybridpatient95

i have the manual procedures saved just doesnt say the rod bolt tq.. it has the main studs and those little 6mm bolts.. thats all.. would you happen to know the page? lol

PirateMcFred

Call the dealership.

The_Head

Damn thats a little harsh, he was actually asking a tech question on honda-tech.

PirateMcFred

Why is that harsh? There is a **** load of information in Tom's thread that many people have collected there and this guy will not search for a simple sting of keywords.

I search for posts specifically with the keywords "f23 rod torque" in the Prelude Forum and lo and behold 3 entries down I get my own ******* post on the F23 rod torque procedure. It took me less time to do the seearch than it took for the guy to post his questions and wait...

How is that harsh? If he cannot perform a simple search and find the info then he can call his local dealership and get his own factory manual copies like I did a year and a half ago. I am not here to repeat myself a thousand times. I posted it and told him where to look. he would not even search one single thread let alone a forum. It also does not help that he asked the same question in the same thread that I posted the info in.

hybridpatient95

i def searched and didnt find anything.. and i wrote the exact same thing you did..

i dont post much because most of the time i search for the stuff.. i post when i cant find any info... isnt that what a forum is used for??

PirateMcFred

Well then start with page one of Prelittlelude's thread and look for the word "F23" in association with pictures of the procedure and work your way to the end of the last page. If you cannot find it then I am sorry, but there is nothing I can do for you.

Pirate

The_Head

I must admit, threads like these should be edited because they get too long with just comments. Or maybe the information shuld be condensed into an article and added to the FAQ thread.

prelittlelude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by The_Head &raquo;</TD></TR><TR><TD CLASS="quote">I must admit, threads like these should be edited because they get too long with just comments. Or maybe the information shuld be condensed into an article and added to the FAQ thread.</TD></TR></TABLE>

yeah its amazing that for a while my thread was longer than the turbo prelude thread LOL, its just hard to go back and fix everything,

i remember when i first for into the h/f thing, when i was seraching around and i found a long thread i thought to myself "gold mine!!!" and i would be all excited and spend hours religiously reading the thread i would find. i guess its a matter of motoivation, interest and excitement.

The_Head

Yeah true, but alot of the posts are ones like this and it gets to be a pain to read through them.