Thought I'd post up my easy fun Sunday morning project for everyone.
I have a lot of H22 parts laying around my garage including a cylinder head, intake manifold, with throttle body and other random parts.

I got to thinking it would be pretty cool if I could some how adapt the H22 unit to work with my factory F22 intake plenum.
Now I know the F22 manifold has long crappy runners and so on but figured what the heck.
Maybe a larger neck and pathway for air will help with better volume.

Here are the two TB's next to one another.


The size difference is considerable and if you try this be sure to spend a few hours grinding the upper manifold down to take advantage of the larger bore of the Preludes throttle opening.

Here is my manifold on the workbench, just after I finished porting it.


Heres the pair mated up looking good.


And on the car.


The close observer will notice my map sensor is no longer mounted on top of the throttle body.
The jabroni who owned this before me filled in the map sensor location with jb weld???
I have no idea why, but I just ran vacuum line from the vacuum bungs on the drivers side over to the map sensor and pushed it back to the firewall.

I fired it up and had zero issues, aside from a high idle.
No check engine codes, lots of power, and it doesn't bog down a bit.
Can't wait for my hairdryer to be on the car so it can really take advantage of the additional flow.

Throttle response feels improved although I can't give it a good "butt dyno" run because I just installed my new Exedy stage 1 clutch yesterday.

Sigh, its gonna be 400 more miles before I can test out her new nose lol.

Hope everyones having a great Sunday and go Patriots!!

 

Nice DIY. Looks clean.

 

(Sorry its a bit of a read )

Ok well its been a week since my H22 throttle body install and I have only encountered one issue with it.
Two days after installation I got a CEL.
A quick check revealed code 92 or,
P0441 EVAP Emission Control System Improper Purge Flow.

I'm actually kind of surprised it threw this and not one for the MAP being it is now remotely mounted.

So I began looking into the code and what it could be.
After exhaustive research into the EVAP system on our cars I came to the conclusion the only thing it could be, relating to my throttle body swap anyway, was insufficient flow from the EVAP purge control solenoid valve to the throttle body.

After popping the hood I noticed the nipple on the H22 TB for the EVAP line is slightly smaller than the Accords and as such the vacuum line was loose.

I attached a hose clamp and, with the line secure, thought all would be well.
I pulled the fuse for the ECU, clearing the code and fired it up.
No code and all was well.

Then 3 days ago my CEL came on again, and again its code 92.

This time I pulled the throttle body to inspect the EVAP ports in the throttle body bore, and made sure the passageways were clear.
Some Berryman's knocked out some carbon buildup and again I thought the issue was resolved.
Cleared the code and was good until tonight.

I was just driving home from Walmart and the same code popped again.

I am not sure why this code keeps coming up.
It seems to me that all the systems of the EVAP system should be in place and functioning correctly.
I realize its a bit of an ad hoc assumption to think it must be the TB but it certainly must be related.

I never had this code running my stock F22 TB.

I could really use some help with thoughts on why this code keeps coming up.
Most of the tech/repair ideas out there have to do with stock issues and I am confident the H22 TB is responsible.

I realize I could just switch back but this issue isn't keeping me off the road.

Suggestions, advice, and thoughts please guys, help me figure this out, thanks!!

 

I should also mention I am not expecting a direct "here's your problem and how to fix it," kind of answer.
Anyone please feel free to chime in with intelligent suggestions on possible issues.

 

Hmm I don't seem to be getting a lot of support on this one

After giving it some thought I decided I'm going to address the vacuum issue.
Being that the purge fitting on the throttle body is visibly smaller than the f22 it seems to be the most glaring issue.

My plan is to hook up my golden eagle vacuum block, which was going in with the rest of my turbo build anyway.
What I have in mind is to draw vacuum to the block via the brake booster line pre-check valve.
Then I can run my EVAP directly to the larger fitting I will install on the block.

Once I boost I am going to have to add another air check valve to avoid sending boost backwards through the EVAP system.
Hopefully this will have that canister purging like nobodies business, we'll see.

 

What exactly did you "grind" down? And why?

 

The upper plenum was ported to the same size as the new throttle body I installed.
If I had not enlarged the manifold, adding the larger throttle body would have been pointless.
My goal is simply to make my manifold less restrictive.
With a turbo on the way, I am trying to take care of any other mods I feel could be beneficial ahead of time.

 

What kind of car do you have ? It doesn't appear that there's a hose clamp around the evap hose at the top part of the TB. Is that the one you clamped up ?

 

Its a 96 accord and yes the evap line has since received a clamp.
The pics in my first post were immediately after I finished installing the tb.

 

Ok so im just wondering you just changed the tb and kept the stock manifold?...now if I were to get a. H22 manifold n tb would there b any mods that would have to be done. Im just a lil sketchy on doing the porting but if I have to ill have do it

 

An H22 manifold will not bolt up to the f22 cylinder head.
The flange bolt pattern is completely different as well as runner location, size and shape.
Additionally the upper h22 manifold cannot be swapped onto the f22 lower so all you can really use is the TB.

I've heard of some people using the f23 or h23 as an upgrade but I didn't have one of those laying around so I went this route

It is necessary to port the manifold as the h22 tb bore is significantly larger, any gains would be lost if you simply bolted on the h22 tb because the neck of the f22 mani is so small.

I should also mention that I wouldn't suggest doing this unless your planning on cramming a lot more air into the engine, ie forced induction.
I doubt I am gaining anything by simply adding the larger tb.

 

O ok I was told wrong I was told that most h series part will bolt right up glad I no now.. thanks for that info on that im just looking to do some easy cheap mods to gain some power but I might look into that tv swap though

 

Ok so as promised, here goes another attempt at getting my EVAP CEL issues taken care of.
I decided earlier that the issue "must" be related to a shortage of vacuum drawing, or purging, fuel vapors from the charcoal canister.

Since I am going to turbocharge this car anyway, and had a golden eagle vacuum manifold laying around, I decided to install it now and give the EVAP system more vacuum for purging duties.

Here's everything I used for installation.


I love multi-packs like this, having extra parts for another project comforts me.


Anyway, first I yanked off my super bad#%$$ new Bosch Icon wipers, I love the spring free, simple design of these wipers.
Oh yeah they wipe rain very well too


Next goes the cowl.


Here's my project boat holding my parts, which is more than its done in a while.


Anyway I spliced into the brake booster line, added a T fitting, and mounted the vacuum block.






Here's everything back together, with the EVAP control solenoid now running to the vacuum block instead of the TB.
I reset my CEL again so I should know in a few days if this finally took care of the issue.

 

are you going to get rid of your high idle? higher idle can also get the jump into a cars power band, . id like to know what your normal idle speed. i have the same motor, and am thinking of doing some work to it .

 

Did your last post get rid of the CEL issue? I happened to see this post, and thought about doing it to my Accord as well. Seems pretty cool to me.

 

Sorry for the delayed response.
Yes, I did correct the high idle, I simply has to adjust the stop screw which had previously been adjusted.
The yellow factory setting had been changed.
I'm not sure what you mean about "jumping" into the powerband, but it sure was annoying.
My car idles around 800 rpms.

Yes, the CEL was annoying but I have a feeling it was unrelated to the actual amount of purge through either TB.
I never actually located the exact issue either, as before I got rid of it I swapped over to the B1 head, and changed EVAP components in the process.

The main addition was a sensor on the B1 EVAP lines, that was not present on my LX.
Im drawing blanks trying to remember what it was though.
Its been awhile.

 

The only difference in vacuum hoses is that the h22 uses a port for the iab's. I think the f22 and h22 both have the same amount of ports.

The only thing it could have been was your actual evap component(s). You probably just needed to do a test on em. My accord evap hose fits perfectly onto the h22a throttle body with no issues.

 

nice writeup
I plan to do this in my turbo f22 as well...thanks!

 

Hey man i have an f22b1 would something like this help me get a louder intake noise? What would you recommend for a better sound out of this motor?

 

Np, I hope it benefits your setup.

In your case I would recommend driving your car off a cliff, should make for quite a noisy event.

 

Why would you want a louder intake noise?

 

Kool diy man. I have a f22b1 im thinkin about puttin an h23 intake mani on. U kno what all I'll have to do to make it work?