OK.. I am in the process of building an H23 VTEC. Using my H23 block and I bought an H22 head along with many of the other misc parts you need. One day I plan to fully build the bottom end and go turbo but that is until later on down the road. Until then I'm going to run this all motor looking for hopefully 185ish area whp. My problem is compression. H23 has 9.8:1, the combination of h23 pistons and an H22 head lowers the compression to approx. 9.3:1, which I don't feel is going to yeild the power i want. So, im trying to figure out which option to go to raise the compression. I'm going to have the head milled no matter what to just make sure it sets on the block evenly which will raise compression slightly but that will probably only get me back up to stock H23 c/r of 9.8:1 about. I know I could use aftermarket rods and run JDM Type-S Pistons without having to resleeve but the only aftermarket rods i can find for the H23 are crowers and i dont have that kind of money. I guess the only other option is to use stock h23 rods(maybe have them shot-peened) with either USDM or JDM H22 pistons. Does anyone know where I can get cheap h22 pistons and if it very difficult to change the piston with the engine still in the bay. I'm doing the entire conversion with the engine still in the car but it will only be the block really sitting in there when it comes time to change the pistons... Any other ideas on how to raise my compression and maybe what my my goal c/r should be? All help and advice will be greatly appreciated

 

cheapestqualtiy h22 pistons i knowof are oem, and probe rods will be light andshouldnt cost more than 350 foraset.

 

If you used Type-S I'd be a little worried. Go JDM 10.6:1

 

I think Type-S Pistons would be fine if i used crower H23 rods and I'm installing the oil squirters but I don't know if I want to spend like 650 bucks on rods. That is what I would really like to do but I'm looking for a cheaper alternative. Where can I find JDM H22 Pistons??? And does an H22 Oil Pump Flow better than an H23 and if so will I be ok with an H23 Oil Pump???

 

use stock h23 rods and get then cyro frozen and shot peened. Thats what I did

 

how much does that cost?

 

depends where you go. Its not too bad. I dont seeit being too much more than like 150. I cant remember how much I paid

 

So you're gonna go with a milled head and Type-S pistons? How much you gonna
mill? What cams? The reason I ask is that if you mill the head .010" with Type-S
pistons you'll Be pushing about 11.8:1CR. You can offest that CR with cams that
have a lot of overlap, just wondering. How fast do you think that you want to
spin the engine to?

I sure hope you're going to spend a lot of time tuning and get either a custom
tuned chip specifically for your ecu or a stand alone EMS. But I think that with the
bump in displacement and CR that your goal of 185 whp is going to be easy to hit. Let us know good luck

the Pirate

 

I saw a guy run type-s pistons in an H23....he melted them

The H22a head has a slightly larger combustion chamber but I'd be wary if I was milling the head a bunch

 

honestly. dont waste your money on type s pistons if your gonna go boost... your gonna get high comp boost that way and im sure you will blow your motor in a few weeks... I doubt you would wanna waste all that money and not even have a motor that you can boost on. besides, any factory h22 pistons, type s or jdm or usdm, the ring lands WILL collapse under boost, anything pretty much more than 5-7 psi.

also, how are you going to lay the crank in the motor if your going to do it all in the car still. kinda hard to hold a crank up and put the main caps in... just a thought...

 

i have an h23 vtec inside of a hatch that should be running by tomorrow or the next day i have a set of h23 crower rods and running 2001 h22a4 pistons and ive milled the head 40 and i just have crower spring and retainer and my head is ported and polished am i in trouble

 

people replace pistons with the block still in the car all the time so im not worried about that. And... When I do boost one day I plan on fully building the bottom end with sleeves and forged internals and i definitely wouldnt be using pistons with c/r anywhere near that high. I think I'm just going to run H22 pistons for a while until i decide to go turbo probable not until the end of summer or late in this year.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eduardo &raquo;</TD></TR><TR><TD CLASS="quote">i have an h23 vtec inside of a hatch that should be running by tomorrow or the next day i have a set of h23 crower rods and running 2001 h22a4 pistons and ive milled the head 40 and i just have crower spring and retainer and my head is ported and polished am i in trouble</TD></TR></TABLE>

you're probably fine. I was talking about using type-s with an H23 head...big no-no

 

Ok i need opinions... I think I'm going to mill the head, use a thinner head gasket and use flat bottom valves to raise compression, the combination of all that should get me near about 10.5 which i think should be sufficient, this why I won't have to mes with the bottom end until I'm ready to BUILD it...

 

last i was into it eagle makes rods for your h23 shouldn't be more than 400 shipped. if you look type s pistons will be 220-250. i got mine oversized new for 220 w/rings shipped on closeout. i'd think about taking the block out and having it machined with the new pistons. how many miles on the block? if you buy pistons from wiseco or je and such they will most likely not sell you the pistons in factory bore unless under 35k on the block. if you plan on boost later on then leave the compression be. invest later on with lower cr pistons and bore/honing. you can have your stock rods shotpeened no problem. good luck getting the oil jets to fit. if you balance or true the crank it'll be most accurate to plastiguage with block upside down. another plus to taking it out. its been awhile since i've been on the boards. whats the longest living 2.3vtec out there? my setup is still up and kicking. stroked jdm2.2vtec balanced and cut .010 crank. rods shotpeened and .25mm type s pistons. talk to satan. he's got knowledge on the subject.

 

sorry. didn't read your last post