h23 intake manifold v.s h22 intake manifold - Honda Prelude Forum

slp mode · 08-09-2002, 09:49 PM

First of all I did a search so no flamin.
I keep hearing about when people swap motors that they have to swap out the intake manifold also. I have the hybrid version and one thing I know is that the shop used the same h23 manifold. That means they have to be the same right? Could I be losing power by not using the h22 manifold? Does anybody know the part numbers or differences between the two?

tastyratz · 08-09-2002, 09:57 PM

i heard alot that they arent supposed to even bolt up. does that shop have a machine shop? they might have modified it. i think the h23 manifold is bigger but im not sure. dont hold me too it but this intrigues me cuz i wanna do a swap and if i can use my manifold how somehow it would be great

slp mode · 08-09-2002, 10:01 PM

Yeah but I wonder if maybe the h22 manifold has better performance qualities?

slp mode · 08-10-2002, 07:40 AM

Come on guys!!!!!Someone has to know about this. PLEASE!!!

Grant · 08-10-2002, 08:52 AM

H23 manifold won't bolt up to a h22 head. I've tried..

slp mode · 08-10-2002, 06:50 PM

Yes I know that but somehow the shop did it with some sort of modification. But my question still stands does any body know of specification differences between the two. Am I losing power with this manifold?????????? Or anywhere I can find the info on this.

08-11-2002, 05:36 AM

the 2 manifolds are almost the same.... the upper 1/2 is exactly the same part. i havent looked at both side by side but i believe the only difference between teh lower portions is the flange that bolts to the engine. roumor has it that the h23 manifold will bolt up to a f22 but who knows....

slp mode · 08-11-2002, 09:23 PM

So if they did some mods to fit it to the head, performance wise I am not losing anything right? Thanks for the knowledge

accorracer · 08-12-2002, 07:25 AM

if you run the h23 manifold that means that you don't run secondary butterflies which means your losing low end tourque (if they made it fit it was alot of bs for nothing)

if your manifold has a vacume line going to what looks like a diaphram then your using the h22 manifold if it doesn't have that then its more than likely a h23 manifold

btw why did they use the h23 manifold ?????????

Absolut · 08-12-2002, 11:47 AM

Quote:

Originally posted by accorracer
if you run the h23 manifold that means that you don't run secondary butterflies which means your losing low end tourque

The H23 intake manifold does have secondary runners. Other then the bolt pattern on the head, the manifolds are the same.

slp mode · 08-13-2002, 12:31 AM

Okay who's right???

I guess I should maybe call honda or something.LOL

red92si · 08-13-2002, 01:29 PM

Absolut is correct. The H23 and H22 manifold are identical with the exception of the flange that bolts to the head. Both have the secondary intake runners and butterflies.

Crate · 08-13-2002, 03:57 PM

hrm... i wonder if i could sell my h23 intake manifold to my friend who has an f22b motor........wonder if he'd see any gains.

boostedH23a1 · 08-13-2002, 08:52 PM

THE H23 MANI HAS THE SAME TOP AND PRETTY MUCH THE BOTTOM EXCEPT FOR THE BOLT PATTERN. THEY BOTH HAVE BUTTERFLIES. they would have to modifly the flange to bolt it on. and now you should not be loosing any hp by using this mani.

slp mode · 08-13-2002, 11:00 PM

That's pretty much what I wanted to hear, thanks man.

Tek12 · 08-14-2002, 03:08 AM

i have done a h22 swap into my h23. They used the intake from my h23 and it works on the h22. Only problem is that the injectors cc is 240 (i guess) for the h23 but the h22 needs 320cc