H manifold design

[PR CB7]

what is this poormans euro-r that you refer to??

i am poor and i have an extra h manifold in my parts box.

something needs to be done with it.

it take a lot of effort

is taking the 8 holes and making 4 big rectangular runners

d112crzy's got a pik of the manifold i did for him

[mightyaccord]

it take a lot of effort

is taking the 8 holes and making 4 big rectangular runners

d112crzy's got a pik of the manifold i did for him

Sounds neat! significant gains on this poormans IM?

[PR CB7]

great gains after 5k rpm

remeber kids this is only on the h22-f20b-gsr's

[d112crzy]

but you would think with the spacer would allow more air in, which would help?

How would it allow more air? The manifold will hold more volume, but that's useless since it's not the manifold you're trying to fill with air.

The less restrictions, the better. That goes with any setup, turbo or n/a.

I have no other proof besides my butt dyno(it's accurate by -/+10whp) a tuned h22 without the spacer is faster than a tuned complete stock h22. All other mods identical.

Here is the only picture I have of the manifold. It's the same design as Cisco's white project manifold.

[Flatline]

How would it allow more air? The manifold will hold more volume, but that's useless since it's not the manifold you're trying to fill with air.

The less restrictions, the better. That goes with any setup, turbo or n/a.

I have no other proof besides my butt dyno(it's accurate by -/+10whp) a tuned h22 without the spacer is faster than a tuned complete stock h22. All other mods identical.

So you basically un-separate the dual runners and make it one huge runner.

Thus you lose some interference from the air coming in. Just made it more free-flowing.

Are you running he IAB's, plate as as spacer or nothing at all?
and woule doing the same to the IAB plate change anything?

[d112crzy]

I'm running no IAB plate along with that manifold design.

It's definitely a lot more free flowing. Thanks to mr PR CB7.

[Flatline]

I'm running no IAB plate along with that manifold design.

It's definitely a lot more free flowing. Thanks to mr PR CB7.

like the whole "hot dog down a hallway" expression.

what did it take to cut into the manifold? and how long did it take?

also, how thin are the spaces between each port? looks awfully thin to me. and did you fill in the small port holes in the middle between each larger port?

[fatboy1185]

makes sense. I already have my h22 plenum completely gutted out, it's totally open, now i just need to start boring out the opening where the TB goes.

[d112crzy]

like the whole "hot dog down a hallway" expression.

what did it take to cut into the manifold? and how long did it take?

also, how thin are the spaces between each port? looks awfully thin to me. and did you fill in the small port holes in the middle between each larger port?

It's a major bitch. Just ask Oscar. I did only 1 runner because all I had was an electric dremel with some bits. He did the rest with a big grinder and cutting wheel.

[Flatline]

It's a major bitch. Just ask Oscar. I did only 1 runner because all I had was an electric dremel with some bits. He did the rest with a big grinder and cutting wheel.

Worth it though.

I am going to try this soon enough. I want to build an H22 head for track races. The track ill be going to didn't have any CB's and only two other hondas... none of us go under 15 so i have to bust me ass for that.


This application should be good for an n/a track car.

[PR CB7]

^^^^^^^^

ull give up


ill ask a machine shop
if they'll do it for under 50$
ill save some time, money on the bill, carbide bits

[93F22A6]

At least it's not cast iron once you try to do a little port work on that shit you'll be glad these are all aluminum. What do you do as far as the gasket for that intake? And what about the upper part as well? Is it completely gutted to where it just open all the way or is ot just like the manifold with the skinny runner sparations?

[PR CB7]

the division on the runners are razor sharp, so the plenum would be fully gutted

[93F22A6]

What size tb are they running wth that mani set up?

[d112crzy]

My plenum isn't completely gutted. The runners actually start at my plenum, I just made them into 4 just like on the runners.

I used RTV copper gasket.

Runnings stock tb for now. It's a HUGE restriction for my setup. It would be fine for stock h22's though.