Ok, I am REALLY interested in doing the H23A1 head swap onto my F22A1 motor. But have been told that the compression will suck and the only way for me to get any benefits is if I boost it.

I see this is a very popular swap (aside from the H22 swap). anyone do this without boost and notice the lack of compression, or no increase at all in power?


Thanks

 

Bump

Anyone?

 

I'm also planning on doing that swap but I don't think you will lose any compression at all. If anything you MIGHT, just might gain a little. The H23 stock compression is 9.8:1 and the F22 is 8.8:1. With the slightly larger bore of the H23 (87mm vs the F22 at 85mm) you will probably just break about even and maintain an 8.8:1 or similar compression. I wish you the best of luck with your swap and hopefully my little tidbit of info is helpful to you. You may also try CB7tuner or accordinglydone. I love Honda-Tech but sometimes you just can't find some of the more technical stuff here. GL!

 

Um.. Forgive me if I am wrong (This is why I am taking automotive tech right now) but if the head of the H23 has a larger bore then the head of the F22, then wouldn't the compression be less? There would be more room for the air and gases to move and not build as much pressure.

Again, I may be wrong so forgive me if I am.


Modified by a4thgenaccord at 4:55 PM 7/1/2007

 

hahaha.....

 

And to stay on topic, this specific head swap will yield a stock compression ratio.

The difference in the bore doesn't make enough of a difference to raise it.

Now, it would be a great idea to mill the head. Not only to make sure that the surface is true, but to raise the compression.

Even if you don't mill the head, you will notice a good difference in power.

I hope you're going to use at least a pt6 ecu(f22a6).

The best option would be to use a chipped p06 with the proper tune, which I happen to have.

You can also use a p14, but would require you to wire up a knock sensor.

You could also use a p39, f22b dohc ecu. The compression on that engine is 9.2 and is pretty much what your f22/h23 will be, but with lower compression.

Go to cb7tuner.com. All the information you need is there. You'll have to sort through the thousands of stupid, idiotic, misinformation it has, but there are at least 3 threads on this topic with the correct information.

Cb7tuner.com may be full of ********, but at least it has intelligent ********.

 

just to get back on topic.

get some high compression pistons

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by d112crzy &raquo;</TD></TR><TR><TD CLASS="quote">And to stay on topic, this specific head swap will yield a stock compression ratio.

The difference in the bore doesn't make enough of a difference to raise it.

Now, it would be a great idea to mill the head. Not only to make sure that the surface is true, but to raise the compression.

Even if you don't mill the head, you will notice a good difference in power.

I hope you're going to use at least a pt6 ecu(f22a6).

The best option would be to use a chipped p06 with the proper tune, which I happen to have.

You can also use a p14, but would require you to wire up a knock sensor.

You could also use a p39, f22b dohc ecu. The compression on that engine is 9.2 and is pretty much what your f22/h23 will be, but with lower compression.

Go to cb7tuner.com. All the information you need is there. You'll have to sort through the thousands of stupid, idiotic, misinformation it has, but there are at least 3 threads on this topic with the correct information.

Cb7tuner.com may be full of ********, but at least it has intelligent ********. </TD></TR></TABLE>

What was that thread you linked before?

 

I don't remember linking to any thread.

 

What the heck happened to the other thread? they should have been merged, they both had different information in them.

 

read pirates thread on the h23/f23 bore out the f23a to 87mm and slap in some prelude slugs they will yield some nice compression with good cams to suit...

 

im about to do a h23 head on f22 block what power can i expect, from the stock 135 hp 142tq, also if i remove the butterflys from the h23 intake manifold will that give any extra power?