H23 Intake manifold

[ASTCB7]

what is a h23 intake manifold? what does it? Pros cons? i appreciate it

[sow3r]

its the intake manifold of a 92-96 prelude SI i believe. its better than our IM and it bolts right in, you also need the TB. AND you need the IAB box out of a f22a6 and the ECU from that same car to make it work(open secondary runners).

i short words its a performance part for your car.

[ASTCB7]

what kind of performance do you get and what is the over price for all this?

[Losiracer2]

It gives a noticeable increase, I'd say from going from an F22A1 to this manifold setup, about 10-15 hp. Because it has 8 inlet ports instead of 4 and the throttle body is about 4mm bigger in diameter. Well I guess you can say the F22A6 manifold has the same bottom runners, but the plenum volume is also 2-3x the size of the F22A1's. Basically you're engine will breath MUCH better in the upper RPMs

[sow3r]

better throttle response and few ponies. It depends where you buy it from,
in a junk yard about $100-150 for everything.

[Tippey764]

Alright ill just ask this here.

I found one myself at the junkyard

I got the upper half off and was trying to get the lower half off

I have all the bolts bolting it to the engine block out but it wouldnt come out

What was i missing?

[nate'sCB7]

there is a support beam type thing underneath it thats bolted the IM and the block

[Tippey764]

there is a support beam type thing underneath it thats bolted the IM and the block

Is it hard to remove? Im going back tomarrow in the rain to get it off. Man i want this intake manifold so bad lol.

[Father Time]

Alright ill just ask this here.

I found one myself at the junkyard

I got the upper half off and was trying to get the lower half off

I have all the bolts bolting it to the engine block out but it wouldnt come out

What was i missing?

The one that goes to the support bracket on the back of the block that connects to the runners?

[Tippey764]

The one that goes to the support bracket on the back of the block that connects to the runners?

Yes

Sorry OP for a hijack but this could come in handy for you too lol

[Losiracer2]

Is it hard to remove? Im going back tomarrow in the rain to get it off. Man i want this intake manifold so bad lol.

no its easy, but you need a long extension to get to it from underneath the car. I think its a 12mm bolt.

[nate'sCB7]

Is it hard to remove? Im going back tomarrow in the rain to get it off. Man i want this intake manifold so bad lol.

it depends if the car is off the grownd.......if its lifted up you can get underneath it and BAM the bolts are right there, you cant miss um'

Then you have yourself a H23 IM!

[turbo90accord]

yea the strap/support that goes under the IM to the block. its held on by a 12mm bolt.

IMO for an all motor car its best to run the A6 runners with the h23 upper plenum and TB because the A6 has longer runners which help with torque especially when combined with the h23 plenums increase volume over the a6.

to the OP its not 100% nessassary to run the ECU and the butterflys can be run open at all times and added power will still be utilized. I really dont see the point in controlling them when they are open at full throttle anyways.

[turbo90accord]

no its easy, but you need a long extension to get to it from underneath the car. I think its a 12mm bolt.

you can reach it under the intake manifold with a socket and get it, no need to get at it from all the way under the car.

[Tippey764]

you can reach it under the intake manifold with a socket and get it, no need to get at it from all the way under the car.

im so happy now i cant wait to go get it lol. So its better to make a hybrid between the a6 and h23 intake manifolds? I have an a6 right now