I've seen others swap F22B and H23 DOHC heads on there F22A blocks. Is there is significant power increase in doing so? I've heard the SOHC F22A actually flows better than most other Honda DOHC's
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F22B/H23 head vs F22A?
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The F22A head flows very well when properly ported. Stock, it’s not all that special.
The F22B DOHC head is the most direct and reliable head swap option, and should be good for maybe 15hp over the F22A6. That’s with the proper ecu and manifolds to go with it. The F22B DOHC has higher compression than the F22A (9.3:1 vs 8.8:1), though im not sure if that increase comes from the head, pistons, or a combination of the two. If the pistons are the same as those in the F22A, then the gain will be closer to 20hp.
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The increase in compression between the F22A/F22B DOHC is the piston. From what I have seen the H23A1 Non VTEC, F22A1-6 and F22B DOHC, F22B1-2 combustion chambers are the same volume. it is only the VTEC P13 & P5M heads that have a smaller combustion chamber.
As far as flow goes, the F22B1-2 and F23A1-5 castings flow better out of the box than any of the DOHC versions. The PT3 F22A1-6 head casting flows just shy of the aforementioned SOHC F series heads. Minor porting is required in order for it to easily outflow the SOHC F22B series heads. The only real bonus to the DOHC is the ability to adjust the intake and exhaust cams individually. That being said, there are SOHC camsharf grinds that can be suited to whatever goals you are looking to achieve.
What are your goals, maximum cylinder head port CFM, actual power or a low budget build with the best out of the box head?
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Originally posted by GhostAccord View PostWhat are your goals, maximum cylinder head port CFM, actual power or a low budget build with the best out of the box head?
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In that case the F22B DOHC would probably be your best bet. Same combustion chamber diameter so there would be no issues with a lip around the head. The Honda shop manual states 0.2mm (0.008) for the limit of head surfacing. That would only get you from 8.8:1 to 8.9:1 compression ratio. You would have to remove 1.62mm (0.064) to bump the compression up to 10:1.
I'm sure you can do more than the Honda specified 0.2mm and get away with it. However, I've never tried myself so I'm not one to speak on specifics on how far you can go before you start messing with clearance issues. I'm sure someone else could chime in on that.
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Originally posted by CB7Xhris View PostLooks like thats the head I'll be going with then. Now to figure out if I want to hassle with ITB's...
For a daily driver it would probably be more trouble than it's worth. It takes a GOOD tuner to make them work correctly and for a mild setup as you described it wouldn't even take full advantage of them. A single plenum manifold is better for drivability and it is easier to work with both in tuning and in related parts.
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Originally posted by deevergote View PostThe F22A head flows very well when properly ported. Stock, it’s not all that special.
What seems interesting to me is that at least visually, the PT3 F22A and F22B DOHC non-vtec ports look nearly identical. I wonder if they have used the same casting components...
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Originally posted by GhostAccord View PostThe only real bonus to the DOHC is the ability to adjust the intake and exhaust cams individually.
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KBA, did you read the OP's original question? He wants the best bang for the buck out of a stock head on a budget build. Not some hardcore SOHC racing application. But thanks for the lesson on 1990's tech.Last edited by GhostAccord; 04-04-2018, 06:24 PM.
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You will probably get more from the H23/F22A6 hybrid intake, a ground cam, and full exhaust. Hell you can skip the cam and run all that on a stock PT6 ECU. I had that setup back in the day and it was glorious
Originally posted by lordojaim with you on that one bro! aint nothing beat free food and drinks any day of the week, even if its at a funeral
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There should be something in the DIY section. You will need the EX ECU and a pin out to connect to the IM if you don't have an EX/SE from what I remember. But even on my EX I felt huge butt dyno gains from just swapping the plenum.
Originally posted by lordojaim with you on that one bro! aint nothing beat free food and drinks any day of the week, even if its at a funeral
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