H22 Head

[CB7=91]

I just wanted to know in order to do a H22 head swap on a f22a1 what do you need.

[rickyduckworth]

I just wanted to know in order to do a H22 head swap on a f22a1 what do you need.

you need a lot of knowledge and a lot of parts, so read up (that's the point of being confined to certain forums as a new member) because all the info is here.....if you're too lazy to read up, then don't attempt the swap because you'll never make it; it's very involving

[JohnD1079]

i agree with ^^^. If you read you would also find out its pointless to do that headswap.

[deevergote]

It's not completely pointless... but I wouldn't do it to a daily driver.

The H22 benefits from high compression. The F22A has considerably lower compression, so you will lose some power. The F22A bottom end CAN rev high enough to take advantage of the H22 head's flowing ability, but it would be a risk with a high mileage motor.

Also, the F22A head actually flows BETTER than the H22A head... even moreso with some work done to it. Buy a full H22, or put some money into the F22.

[rickyduckworth]

the last i read, the honda s2000 was the best flowing head from honda (and one of the best, if not THE best, flowing production head ever

the h22a type s was a close second (not as well known or easily found) and the standard h22a head was 3rd, still ahead of most japanese manufacturers

the f22a was not on the list, but the nsx (all generations) was, the s14 head, etc......

this is going by volumetric efficiency, not total volume per liter (like some head builders do).......it's like "hp per liter".....HP is HP, sure it's interesting when you can get 250hp from 1.8 liters, but that 500hp 5 liter is pretty impressive too

i saw a write up about it on a japanese site about 3 years ago....i'll try to find it

and if i remember, the f20c has around 112% VE at its peak, the h22a type s has around 108% and the regular h22a has around 102%....most of the b series engines don't make it to 100% stock, but a well groomed b18c can hit 120% VE without any magic.....

the f22a is around 93% i think......most of the well designed 4 cylinders are near the 95% VE mark today as well......

[Penny]

It's not completely pointless... but I wouldn't do it to a daily driver.

The H22 benefits from high compression. The F22A has considerably lower compression, so you will lose some power. The F22A bottom end CAN rev high enough to take advantage of the H22 head's flowing ability, but it would be a risk with a high mileage motor.

Also, the F22A head actually flows BETTER than the H22A head... even moreso with some work done to it. Buy a full H22, or put some money into the F22.

so if the f22a was the same compression as the h22, it would outperform the h22?

[rickyduckworth]

so if the f22a was the same compression as the h22, it would outperform the h22?

it wouldn't come within 40hp of a stock h22a

[93twodoorLX]

The F22A head flows well in stock form, but responds to modification very well.

Hondafan81 is making 151whp with a stock bottom end, a mild P&P, a fairly mild cam, and a street tune... on a Mustang dyno. Considering a stock H22 makes about 165whp on a dynojet, that's not bad.

No, the F22 head isn't better in stock form than the H22 head, but it responds very well to P&P. Hell, Bisimoto is making 400 crank hp with his F22... there's a reason why he used that motor, and not an H22 or B18.

But yes, you are right. Stock for stock, the H22 outflows the F22.

[rickyduckworth]

The F22A head flows well in stock form, but responds to modification very well.

Hondafan81 is making 151whp with a stock bottom end, a mild P&P, a fairly mild cam, and a street tune... on a Mustang dyno. Considering a stock H22 makes about 165whp on a dynojet, that's not bad.

No, the F22 head isn't better in stock form than the H22 head, but it responds very well to P&P. Hell, Bisimoto is making 400 crank hp with his F22... there's a reason why he used that motor, and not an H22 or B18.

But yes, you are right. Stock for stock, the H22 outflows the F22.

that's the thing though, MOST modern 4 cylinder heads FLOW WELL IN STOCK FORM because the difference in an ELITE flowing head (s2000) and an average flowing head is only about 15-20% VE, which compared to 20 years ago, is nothing......i think the older hondas had the best flowing heads (70's CVCC, etc) and those were around 80% VE, which for the time was great, but they were also tiny engines which needed smaller amounts of air to get that VE...............nowadays, most 4 cylinders are around 2 liters with larger combustion chambers and are getting over 90% VE.......of course every little bit helps, and engines like the h22a from the type s simply have advantages that can't be imitated (superior metal selection based on grain smoothness, valve seat angles) without a complete re-do, but yeah, the f22 flows well....so do most other heads.......that's why there is a turbo kit for everything nowadays

[deevergote]

Taking the original topic of this thread into consideration...

Use the money that could be spent on an H22 headswap to modify the F22A head. A stock F22A block with some headwork and a good cam will probably give more gains than an H22 head slapped on that stock block. If you're going to upgrade the internals of the block, it'd be cheaper to just buy a whole H22.


The H22/F22 hybrid is NOT like the LS/VTEC.