I have a 90 CB7 accord ex and i want to either buy a new block and put h-series pistons, rods, and crank in the f22 block and put a DOHC VTEC head on it or just do an H22A swap. If i just do the H22A swap does it matter what year it is? and will the tranny for the stock F22a bolt right to the H22A motor? or do i have to buy a new tranny to fit to the h22..Im not sure what the best thing to do is. Does anyone else have any ideas on what i should do?
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Well what you're NOT going to do is put H22 pistons in an F22 block, because they are too big. An H22 has a bore of 87 and a F22 of 85. You'd have to bore out the engine but 2mm over is overdoing it and would possibly make the sleeves bigger. Also the H22 has a bigger combustion chamber meaning the piston/rod combo would smack your valves like a Mike Tyson haymaker which of course would K.O. your engine.
Secondly I highly suggest you don't attempt to put an H22 head on a F22(SN: deev is gonna take me to the bank on this one, LMAO
) since it doesn't seem you know what you're doing. Or if you would like do some long and hard research on what it takes.
Your third option is to do an H22 swap. Yes the trans fits fine. Your main concern is properly wiring VTEC, although it shouldn't be too hard if the installer knows what they are doing.Last edited by Joey GT-R; 12-12-2010, 11:23 PM.'94 JDM H22A: 178whp 146wtq
Originally posted by deevergote -
The H does have a bigger bore, however, it has a shorter cylinder than the F, so I don't think there will be any problem with valve slap. Boring the sleeves that much could indeed cause some issues.
H22 - 87.0 × 90.70 mm
F22 - 85.0 × 95.0 mm
If it had a bigger bore and a bigger stroke,it wouldn't be the H22, it would be the H24 (since the H23 is 87.0 x 95.0).
The head swap you're talking about isn't really worth it unless you happen to have two engines that those are the only usable parts from. It just doesn't make for a nice strong motor, unless you plan on boosting it. Is it possible? Yes. Has it been done? Yes. Try doing a search for G22 or G23 and you'll come across dozens of threads about it.
You might also consider building the F22a1 you have. They're capable of making monstrous numbers and there's only one cam, so less moving parts, less things to adjust, less things to break. Search for bisimoto, you'll find some interesting information.Comment
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@ Joey..
1) I was doing some quick research and I don't see why it would be a problem if i just found a cheap motor(F-series) and just use the block itself..then bore out the sleeves, question though...is stroking at all an option?and i don't see why i couldn't put a dohc vtec head on that block and then run IBT'S...so it's not like i dont have any idea what i'm doing..it's a cheap way to build a racing motor if you don't have the ability to throw $15,000 into your car....Comment
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Why the hell would you want to use an F block with H pistons anyway?
It would be far more expensive, and probably less reliable, to do what you are suggesting than it would be to just buy a full H22.
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@ Visualpoet...Thanks for the tips and advice man..I was talkin to my buddy who runs DSM but doesn't hate on us Honda guys, lol. He was talking with me about this type of swap being a good possibility and weentertained the IBT'S idea however, i have heard of it having some valve slap though too..what do you think about a F20B? what would be the best swap for something that's not gonna run me a crapload of money but still give me a pretty quick ride. I'm nt lookin to set any records at the momentComment
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It was just a thought..a frankenstein of sorts!! I know that the H22 would be a better swap...I'm just trying to get more power for little money for right now..I am NOT trying to set any records..so i was just trying to find the least expensive swap.;.Comment
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You just contradicted yourself. You don't just put a head on a block and all of a sudden have a race motor. Even the LS/VTEC swap is still by many standards slow. I burn them all the time with my modded H22A. And while I'm not sure if the H series stroker crank would fit it costs 2 grand alone, plus finding custom pistons and rods of high compression with a proper rod/stroke ration that aren't slapping your valves around would be close to another grand, then paying for machining the block with meticulous assembly probably another 1.5 grand. Add in your precious ITBs, and I mean REAL ITBs, such as Kinsler or TWM, or Toda you're looking at a minimum of 2-3 grand. Plus having a cylinder head to make it even worth while in the first place would be another 2 grand. You don't do a build like that without a good header, and Bisi's H22 header runs almost 800 I believe. Add in some good tuning time and software being that it's a real pain in the ass to tune with ITBs you'd need probably nothing short of a full standalone like AEM EMS, S300, or Haltech ECU. Then after you're done with the engine, add in a brand new clutch to even hold the power you'd put down for about 500. I'd run a build like that, done right of course, to rival that of close to 10,000. There's that cheap race motor of yours.
You sound like you're trying to get H22 power for F22 prices. Not gonna happen, just swap an H22A, or an F20B and call it a day. Nothing else is going to get you there quicker.Last edited by Joey GT-R; 12-16-2010, 11:29 PM.'94 JDM H22A: 178whp 146wtq
Originally posted by deevergoteComment
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@ Joey..Yeah i was just looking at all that the last few days and pricing it and realized all the work it wsa gonna take and said to myself..."hmmm...how bout just slammin in an H22 or F20B.." thanks for the advice though man..what can i say? i was trying to start a project that would have just turned out to be a pain in the ass and a huge dent in my wallet..Comment
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Your plan would involve fairly expensive parts, and expensive machine work. All the seals, gaskets, and bearings alone would be quite pricey.Originally posted by 90cb7owner View Post
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