92gsrteg

my question is can you use h22 internals (rods pistons)on a f23 block with a f23 vtec head? and can you use h22 rods on a f23 crank??

egsir

f22b? theirs a euro f22 dohc vte too.. or are you talking about a usdm f22?

tegboy757

ok first ill say welcome noticing that you just joined last month as for your question what are you askin cause your thread title says f22 but your talking about a f23 what i can definitly tell you is the bore and stroke is different. the f22 has 85mm bore f23 86mm and h22 has 87mm. im an accord guy so ive delt with alot of f series. im sure more people are gonna say it ill just be the first, the best thing i can tell you is search just google your question or check out hondaswap.com and honda-tech.com. If you get stuck and need it explained pm me and ill help

cr1m3rat3z

Yes and no. H22 internals "can" go in but there are things you gotta consider. First off, you'll definitely need to bore that F23 out to 87mm in order to make the h22 pistons fit. Secondly, the f23 has a 97mm crank, meaning the longer h22 rods will push the pistons out of hole (by a whole lot). Easy way to remedy that is take the crank of a h22a4 ('99 and up preludes only) and drop it in the f23 block. You can't use pre-'99 cranks because of the differences in size of the mains (h22a4's of '99 and later share the f23's 55mm mains). Essentially, you're destroking your motor into an h22 but with a little higher compression. Never seen it done so I don't know how that would turn out as far as putting power down. If I had the parts already lined up, then I would go with higher compression pistons(Type-S maybe or better). Or, I wouldn't overbore the block (keep the f23 pistons for low compression) and just boost the living sh** outta a rev happy motor that has OEM iron sleeves! I have seen the build the other way around (H22a4 with f23a1 crank and rods w/h22 pistons) and it produced one monster ass build. Good luck.

kanadaa

F22b was dohc non-vtec.

92gsrteg

soo your sayin if the motor was being built for boost just stick with f23 internals? it is for boost and theres not alot of aftermarket pistons for f23 like there is for h22. its a budget build that im helpin research for my friend cuz he dont have internet.

Hammer Down

or a single cam vtec.

egsir

im talking about the euro f22.. its vtec

kanadaa

I stand corrected.

cr1m3rat3z

Well, if the benefit of the f23 block is that it has iron sleeves, and a pretty decent size stroke. The down side is the rod/stroke ratio (1.4x). The upside to H22 internals is it's ability to rev higher because the r/s ratio becomes 1.58. The stock compression of a f23 is about 9.3:1. With a stock h22 it's about 9.9 or 10:1. A f23 with h22 crank, pistons (have to overbore) and rods would have a higher compression (about 10.5:1) than a stock h22 and keep the r/s of 1.58. With that much compression, you'd want to get that f23 head to flow better to really take advantage of that extra potential power. If you're boosting, you could find low compression pistons for the h22 and alter the compression. A f23 with h22 crank, rods and f23 pistons (don't have to overbore) would yield a CR of about 8.1:1 and keep the r/s of 1.58. BUT, the piston will be out of hole some, I can't remember how much. So really, it's about budget and how much work you want to put into it. You're right, there isn't that much support for the f23 but I have seen some out there. If I find them, I'll post.