all rite ive seen that you can change the head like the h22 head on a f22 block. well what does that really do ? can some 1 inform me plz thx

 

I have been wondering the same damn thing!

 

A have no experience with this swap but if it will work I can tell you that there would be a huge power difference. The h22 is a DOHC unlike the sad SOHC f22. Although the f22 is a fairly strong engine its not all that powerfull. I will tell you that if you are looking into a head swap don't ever do a f22 vtec swap. The f-series vtec head will make about a 5hp gain and its the biggest most clustered swap out there. I did one on my buddys cd7 race car and the vaccum lines alone were a nightmare. If you want some power out of you f22 for cheap through a DSM homemade turbo kit on there. Its easy and quick.

 

the head is the HEART of the engine the h22 has about 200 horse power and almost an identical block as the f22, same displacement....so yea basically if it was done right we are talking about a possible 50 HP increase

 

There are some guys that have done this before. I think one guys name was Pirate? They called it a G22 since it's between an F and an H. Do a search for G22 and they have a write up on it. Tells the whole process, what is needed and what gains are found. Except for some of the oil passages and whatnot I'm pretty sure the block is almost identical between the 2. Many have said the F is great for boosting, so I'm assuming the G would be a little better due to the DOHC.

 

G22 F22b2 block+H22a1 head https://honda-tech.com/zerothread?id=776837

There are a few other where they did an H23 and F23 combos.

G23 F23 block + H23 head https://honda-tech.com/zerothread?id=1046336

G23 F23 block + H22 Head https://honda-tech.com/zerothread?id=1069869

 

so is it a jus take off the sohc and bolt on the dohc? hows it work cant find any were that they explain that

 

I dunno how true this is, but I haven't looked into this yet.
The head swap is usually done for turbo applications.
I doubt it will give u 50hp gain, but again I have not looked into this.
IF it were possible to just swap a head for 50hp, people would not be doing H22 swaps with their f22's.

 

the head will not give you 50hp just bolted on... but if you switch from sohc non-vtec to dohc vtec and tune it you can probably get something like that.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 97LXF20B &raquo;</TD></TR><TR><TD CLASS="quote">the head will not give you 50hp just bolted on... but if you switch from sohc non-vtec to dohc vtec and tune it you can probably get something like that. </TD></TR></TABLE>
50?
I would think probably like 20-25.
But for the cost if it can give 50, might as well dro in an h22 right?

 

They run different compressions, remember they h22 was made with HP in mind, so it has higher compression than the f22, made with "gas mileage" in mind. So obviously, just swaping the 2 wouldn't make up for 50 ponnies just like that.

 

Tuning is really the key. Also... you might get a compression change from the headswap alone. I'm not really sure about that. Since they are the same displacement, I think the combustion chamber might be the key factor. If H22 has a smaller combustion chamber, then you would end up increasing (static) compression. Obviously, piston shaping, head gasket thickness and deck height are all factors - but I don't have the specs in front of me.

The real key difference in the block is that the H22 has more of a square bore-stroke ratio, so it fills the cylinder better (i.e. has better dynamic compression ratio) at higher rpm's... I think. Someone please correct me if I'm wrong on this.

 

so wat ur saying is to do the head swap ill have to get new pistons head gasket and head?

 

is this swap even worth the time? thats tha main question 4 me

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by smokinaccord6 &raquo;</TD></TR><TR><TD CLASS="quote">so wat ur saying is to do the head swap ill have to get new pistons head gasket and head?</TD></TR></TABLE>

no. what i'm saying is check the accord and prelude forum faq's and you should be able to find all the info to help you calculate compression for your new hybrid engine. The people I have seen who did the headswap did not need to change out pistons or anything. a new head gasket is just a good idea whenever you take the cylinder head off.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by smokinaccord6 &raquo;</TD></TR><TR><TD CLASS="quote">is this swap even worth the time? thats tha main question 4 me</TD></TR></TABLE>

it's a question you have to ask yourself. is more horsepower worth the time or the money? maybe. up to you. if you have lots of money and no time you could pay someone reputable to do it for you. if you have no money and lots of time then its probably best to do it yourself. as far as investments, spending money on making your car fast is the worst you can do - but IMHO its fun as hell!

 

personally I think it would be kool to do but would suck cause you'd prolly have to build up the block in order to rev jus that much higher... cause the accord naturally redlines around 6.5-7 and the lude naturally redlines at 7.5-8 but that to me seems like that could be a problem cause you dont wanna go throw a rod... I'd say if you're new be safe n jus go buy a whole h22 n swap it in cause you wont have to build ne thing up that means no down time... cause if you had to build up the bottom end then that means you're motor would be out and that means you dont have a car til you're done... assuming this is your daily driver...
but h22s are pretty easy to get a hold of. jus keep you're eyes open for one of those.