DIY request on H23 head swap

[HondaFan81]

i'd guess 125-135whp

Interesting...Ricky was right at the 135 whp-ish remark on this H23 head/F22ax block hybrid. I think Carlos still has more tweaking to do before a final number is set...but still...for now

[d112crzy]

and how much does the f22b or the h23 put down to the wheel? around the same no? maybe a lil more. but the hybrid, if done fully, head, intake, exhuast and ecu should be around the ballpark of either on of those engines.

[ZigenBallZ]

and how much does the f22b or the h23 put down to the wheel? around the same no? maybe a lil more. but the hybrid, if done fully, head, intake, exhuast and ecu should be around the ballpark of either on of those engines.

Maybe a little less because of slightly higher cc's in the combustion area nad piston... therefore lowering the cr just a bit...

I think that's right... I haven't really researched the ratio drop but if I remember right H23A1 pistons have slightly less of a dish then F22Ax pistons...as well as a higher compression height...

I think the head cc's are about the same if I recall correctly... 50 for the H23A1 vs 50.5 for the F22ax...

[d112crzy]

yup, the f22ax cylinder cc is 539.08 and the h23 is 564.75. also, the static compression on the h23(9.8:1) is higher than the f22/h23(9.2:1). dont really have any info about the piston dome or top or w/e u wana call em.

[heylookitsdylan]

im a little bit sketchy on this idea...ive been researching and thinking about this...but how could the H23 head work on the F22AX block, correct me if im wrong, but the F22AX has a 85mm bore size, where as the H23 is like 87mm....would that pose a threat?

[wed3k]

bookmarked

[DjSpeedy]

Wow long time this thread has been up. I was curious on if it would be easier to do an f22b dohc head onto the f22 block, than trying to frank up the h23 setup. I mean if they will both do the same numbers than really all I would need is the f22b head, timing belt, ecu, and maybe an f22a6 intake manifold? Does this sound right or I am in way over my head?

[wed3k]

Wow long time this thread has been up. I was curious on if it would be easier to do an f22b dohc head onto the f22 block, than trying to frank up the h23 setup. I mean if they will both do the same numbers than really all I would need is the f22b head, timing belt, ecu, and maybe an f22a6 intake manifold? Does this sound right or I am in way over my head?

talking is easy

i think the f22b heads are easier to swap because of not having to fill in that one part of the headgasket.
but finding the f22b head is harder (for some reason)

anyone know which kind of distributor i need to use?
im suspecting the h23 one cuz of the dual cams?

[ehulst]

for the h23 head swap yeah u need a h23 dizzy, but i also herd an F22A would work too but i'm still in doubt about that....also prelude headbolts, and torque it down to prelude specs...hope to have mine started and completed before may...

[d112crzy]

im a little bit sketchy on this idea...ive been researching and thinking about this...but how could the H23 head work on the F22AX block, correct me if im wrong, but the F22AX has a 85mm bore size, where as the H23 is like 87mm....would that pose a threat?

sorry for the late response, but it still works. Theres a word for that, or an explanation but I forgot it, hopefully cisco chimes in so he can explain this further.
But like I said, it still works, just not to its fullest potential, thats why when you do the f22/h23 you wont get 9.8:1 compression, if you bored out the sleeves to 87, im sure you would be alot closer to that ratio.


yea, the f22b head is harder to find because not only is it from japan, but most of the time people buy the full engine and keep the head. Only way to get one is if someone has fucked up their engine and parts it away.

[ZigenBallZ]

for the h23 head swap yeah u need a h23 dizzy, but i also herd an F22A would work too but i'm still in doubt about that....

negatory on the F22 dizzy... it will work if you cut it (you actually cut one of the holes to alloow the bolt and washer to fit. Fit it up against the head and you'll see what I mean.Oh and search for the mod in some old school places like Hondasociety, Honda-Acura.net, Honda-tech.com adn <blech> Superhonda.)) and use a washer or only use 2 bolts...

Any internal or external coil H22A or H23A1 distibutor will fit perfectly...

Both my DOHC dizzys have been JDM H22A internal coil TD-60U... the ext coil dizzy is TD-61U...

[4thgenaccord]

19.place h23a head WITH intake manifold( heavy i know) onto block with care to not move to much the f23a gasket

Just so I get this right.... Your useing 2 head gaskets. One for the F22 and one for the H23???


Other then that, everything else bolted right up? The EXH fit right and everything?

[4thgenaccord]

Oh and what is "Dizzy"

[wed3k]

Oh and what is "Dizzy"

distributor

[ehulst]

Just so I get this right.... Your useing 2 head gaskets. One for the F22 and one for the H23???


Other then that, everything else bolted right up? The EXH fit right and everything?

you use 1 headgasket from a 98 accord...fill in a coolant passage with Hondabond( gasket sealer ). why are there so many h23 headswap threads insted of them all being in this one?