YES! the H23 head does fit on the F22ax block..

[WiKKeDV16]

first note: in this thread i have copied/pasted everything i wrote in the f22b/f22ax thread.. this is in no particular order.. at the bottom ill do a final review of all my findings as to not confuse the fuck out of ppl.. with that said.. lets start hybridizinig?? lol our sohc's into dohc's..




sound familiar..?? well cb7deathride suggested that i start my own thread on the h22/3a/f22ax hybrid.. so as to not clutter the f22b/f22a hybrid.. thread.. a lil too late thou.. but what the hell.. here goes..

heres a picture of both h23 and f22 blocks



the differences are minimal.. im still researching for full proof.. i know its been done already.... with a different setup.. f22b2/h22a.. he had 2 plug 2 drain holes and that was it.. so well see what else i find

btw.. ud probably end up using a f23 headgasket to meet the bore's in the middle..

85mm of the f22a block and 87mm of the h23a head.. i believe if measured the head actual is like 86.5?? gotta look for that info again as well..
so the f23 headgasket would work just fine..


Credit goes out to Prelittlelude for giving me alot of knowledge with his post on H-T

http://www.honda-tech.com/zerothread?id=776837

[WiKKeDV16]

Got this from my source at H-T

like i said, you can bolt the h22a head to apretty much any f22 sohc block, but after the initial mods of getting the head gasket coolant port dremeled out to line up to the head, and after pluging the oil drain hole, .. its just the little details that you have to take care of.

i mean this wasn't all that hard, but i was luck enough to have alot of parts kicking around. i mean its not like doing an ls/vtec, theres more to it than that. you need all the prelude timing equipment, need to make a custom water pipe, you have to dremel the head gasket, you need to make or have 2 oil plugs machined.. you have to get a h22 waterpump gear and put it on the f22 water pump housing. its just alot of little shit whihc i think will vary depending on wether is a f22a 1 or 2 or f22b 1 or 2. hell this can even be done with the f23.


>>>> but while im talking about possible combinations, the h23 head on a f22 would not require any oil plugs, wouldn't have to change the water pump gear. and i think you wouldn't even need to make a custom water pipe.<<<<<<<<<

[WiKKeDV16]

Quote, originally posted by spanishlude »
hmm makes me want to put my h23 head on a f22 block and junkyard boost it! if it blows o well!!lol

here are some pics, these wern't mine, but stuff i came accross when doing rsearch, i think Gimmpygreenaccord was his name, he took these pics, even though this isn't an h22a1 head, is shows you that with the h23 head you won't have to plug anything where as on the h22 you have to.

but these ill put up for reference:

h23 head with gasket on

also.. the h22a and h23a come off the same mold.. so....





this is why im arguing what ur saying.. because.. the h22a has the same "longer" passageways.. and the h22a head still fit fine on the f22b2 block..

[WiKKeDV16]

f22a1 block + h23a1 head
Ok well i wish i had taken my camera with me last nite, but i helped my friends jay assemble his f22a1 block and put on the h23a1 head.

First off jay decided to rebuild the bottom end, all new bearings and seals, new piston rings with a fresh hone, and a nice new f23 head gasket.

we placed the head gasket(f23) on the h23 head to see if any of the coolant holes should be enlarged, and jay felt they would be fine, but i disagreed a little. in the end we didn't enlarge any of the coolant holes thru the gasket, for the sake of it i did on my project but jay decided agianst it. next we looked to see if all oil holes lines up and if we needed to honda bond anything. and what be discovered is we needed to put a bit on the top left of the head so that as the oil drained out it didn't go into the blind hole and then out. i know its hard to understand without having a picture so i tried the bes i could using ms paint. below is a picture of where the headgasket opening sits for the oil drain hole and where to put the honda bond. the green is over some of the "blind" oil drain ports, we just filled them until they where flat with the surface of the head, agian taking the extra time here is important, just inspect everything, i have taken the guess work out of this for you , but just double check.



thats the best i can do, if any of you attemp this you will immediatly see what im talking about when you put the head gasket on the h23 head. now to my surprise the oil drain holes all line up exactly, way better than they did for the h22 head. this turned out to make things pretty easy. i would have prefered to dremel out the collant holes a tiny bit on the head gasket but we will see how it turns out.

the head bolted on without any trouble, we put some honda bond around some of the other places we might think could cause a problem. also we did not need to remove any of the copper orings that hold the head gasket together. the f23 has 2 of these and they both sat in places that would not get pinched between the block and head. agian i suggest if you do this just double check this on your application, especially if your head or block has material taken off if it. with this combination of stock f22a1 bottom end and stock h23a1 head its going to yeild pretty near to a 9:1 cr

other things that i found very exciting where that the f22a1 side covers and h23a1 top head timing belt side cover all lined up and catched up perfectly. we went with the f22a1 side engine mount because the f22a1 has a different bolt pattern where the mount bolts to the engine, but the where the external part of the mount bolts to the chasis mount it has the smae bolt pattern as the h23 and h22 engine mount which was good news for us so, buying a strait hasport h series in an civic mount kit will work great.

for the timing belt we used the stock h23 timing belt , the h23 lower timing gear the F22 water pump which has 20 teeth and the same belt pattern as the h23. its a good thing that we used the 20 tooth water pump because it appears that the f22 might have a slightly shorter deck height or a different water pump orentation because even with the extra tooth of the water pump after we got the head on withthe cams our tentioner was close to maxed out. though we wern't that worred because we still had alittle left and im going to look in to it, but i think there are other honda water pumps that have the RU type belt spacing that have more than 20 teeth.

as far as the water pipe goes we used the f22a1 water pipe and it works perfectly with the h23a1 head, everything lines up just right without any moddifications. i was ammazed at how well all the covers lined up and how well the water pipe worked, it makes me wish i had used a f22a1 block instead of a f22b2, but no matter. there are only slight differences in the covers and some small things with the block. my next project will probably be a freshly build f22a1 with forged internals and h22 or maybe h23 head. we were both very happy with the way everything went together, the only thing was just making sure that you have hondabond sealing that top corner, and that the copper orings that join the head gasket layers togther didn't get pinched between the head.


enjoy.... hondabond is cheap.. so dont slack off.. lol.. i doubt it would be a problem if u didnt fill it.. it may just cause some leaking down the road..from the head.. which is a no-no.. so just fill it with hondabond and get it overwith.. enjoy...
if any of u need any more IN-depth.. help u can find me on AIM.. WIKKEDV15

[WiKKeDV16]

Cliff-notes List Of Shit To Get! Etc Etc!

h23a/f22ax hybrid:
-full h23a head/intake manifold/distributor/Ecu prefferable it will run on the PT6 but not as strong as the p14

-f23a head gasket.. enlarge coolant holes at your own discretion
-Honda bond a blind hole on the left top corner of the h23a head (till its flush) this is just a preventative measure so that no oil goes into that blind spot and can cause a leak..
-Compression will be Raised near 9:1Cr using the H23a head
-f22a side timing belt covers and h23a top timing belt covers line up and match up smoothly
-h23 timing belt
-h23 lower timing gear
-f22a water pump (has same belt spacing as h23)
-tensioner will be close to maxed out due to shorter deck height of the f22a vs h23a
-f22a water pipe is retained.. no modifications needed there


-besides what i have stated above.. consider this a full on motor swap.. even thou it technically isnt.. if you have to rewire anything for a full h23a swap.. then ull have to do it no..i dont see it being too much of a problem though..

Enjoy..

Also if anyone wants to attempt the H22a/F22ax.. let me know.. and ill post the info here or start another thread..

[HondaFan81]

Wikked: You mentioned the PT6 ECU will work for a DOHC setup? Interesting. Who has tried that?

[WiKKeDV16]

same as running a f22b dohc with pt6.. it wont run AS STRONG.. but it will run.. tis all i was saying.. like.. if u HAVE NO CHOICE. run the f22a ecu.. it will run..

[J-specCb4]

thanks that was very informative

[WiKKeDV16]

[HondaFan81]

same as running a f22b dohc with pt6.. it wont run AS STRONG.. but it will run.. tis all i was saying.. like.. if u HAVE NO CHOICE. run the f22a ecu.. it will run..

I was looking for more of a technical answer on how a SOHC ECU can run a DOHC setup. Is there any extra features in the ECU that the DOHC needs for it to run well?

[WiKKeDV16]

sohc or dohc it doesnt matter to be honest.. as long as injectors are within the same range.. and so is the timing setup.. it will run.. the ign/fuel curves will need to be adjusted via a piggyback if one really wishes to see the full potential..

just because its a sohc ecu.. doesnt mean it cant run a dohc.. nothing special about a dohc.. just an extra cam..

p06/chipped for example.. its a sohc ecu.. but can be run on a dohc.. with some adjustments to the fuel/ign curves..

[WiKKeDV16]

update: put the pics under my photobucket account so they stop becoming Xs even now and then.. that is all.. Carry on

[phatdoughnut]

sohc or dohc it doesnt matter to be honest.. as long as injectors are within the same range.. and so is the timing setup.. it will run.. the ign/fuel curves will need to be adjusted via a piggyback if one really wishes to see the full potential..

just because its a sohc ecu.. doesnt mean it cant run a dohc.. nothing special about a dohc.. just an extra cam..

p06/chipped for example.. its a sohc ecu.. but can be run on a dohc.. with some adjustments to the fuel/ign curves..

exactly, thats what i was trying to say Cisco...

bump

[iamanonymous]

i run my f22b with the pt3 ecu which is inferior to the pt6. like wikked said, it runs. it idles great and pulls well. it is faily fast, but honestly i am very excited about the uber chipped po6 i will be using, which like wikked said again is a sohc ecu that has been completely reprogrammed to run a dohc turbo....using uberdata....but trust me the pt3 or pt6 will work perfectly fine, but if you have the stock ecu, tranny, clutch, yadayada, it won't be much faster than a f22a6 with a pt6...unless you use a safc or something. but it does sound a HELLUVA lot better!

[WiKKeDV16]

bump.. my thread needs more hits than the f22b heads swap thread! come on u bishes! lol