Hello,

Is there a HP limit for the H22 intake manifold? We built an H22, 12.5 pistons, Crower stage 1 cams, ported head, dyno numbers are coming in a bit low (200at the wheels), everything checks out so far. We are thinking possibly the stock intake with butterflies removed could be the bottleneck.

Thoughts and comments welcome.

 

You don't have enough camshaft for your high compression pistons... your power is about right. The intake manifold can make a WHOLE LOT more HP than what you are making now.

 

Thank you, was thinking the manifold was good for much more. This is my son's race car. May look at upgrading the cams. My JDM H22 makes 206hp at the wheels with a stock cam, header, gutted intake, tune. We were expecting a bit more with his build, maybe 240-250ish.

 

It’s my car being mentioned. For reference, full build is A4 block, darton sleeves, Arias 12:1 pistons, cnc ported head, flat faced valves, exh valves +1mm, all supertech valvetrain, skunk 2 pro 1 cams (not BC previously mentioned), gasket matched intake manifold with 74mm throttle body (manifold matched and tapered), on e85. Motor built, balanced, assembled, degreed by reputable machine shop. Between head gasket thickness, deck height, head resurfacing, estimated 12.5-13:1, didn’t do the exact calculations. On hondata s300v3. Compression, leak down, fuel, map sensor logging(doesn’t point to intake manifold restriction like originally thinking) all come back great. Tuner is also very well known and trusted.

I don’t doubt it’s not quite enough cam to capture all the possible power, but on a stock motor these cams are good for 15-20hp. I’m not convinced pairing them with a built bottom end counteracts the gains from the additional lift and duration. People have built 12:1 bottoms with euro r cams and made better power than mine is. Open to hearing if you have firsthand knowledge of your suggestion or data/calculations to support it. Genuinely curious because it just doesn’t track for me as being the entire issue.

 

Your JDM H22 is unusually strong for a stock engine with a header.

Crower Stage 1 cams (which is what your dad stated you have) are WAAAYYY more mild than Skunk2 Pro 1's... you should make more power with the set-up that you described above. What type of header are you using ? Who ported the head ? I think you got something else going on there...

 

Did you notice the H22A4 powered 1995 Civic DX Coupe listed in my signature ?

 

SMSP header, 2.5 outlet into a resonator, 3” outlet all the way back with a muffler at the back. Muffler and resonator are straight through designs. Head work was done by Jeremy Allen/Inline Pro. He sent the head off for the porting as they weren’t set up with their cnc yet. Not exactly sure where it went for that.

 

Nice collection!! 244hp H22, wow. Details please.

I mis-remembered, my son's Skunk2 cam I confused with the cam I have in my parts bin which is a Crower.

We're thinking about checking the degreeing of the cam done by the builder, but what a PITA that is, and in car.

 

Is this a GENUINE Dave Stadilus header or a clone ?

You cannot easily (or effectively in my opinion), although there are a couple of members who disagree with me here, degree the cams IN THE CAR... especially a H22. I know it sucks, but I would pull the engine and degree on an engine stand. No worries on the cams... I can't keep track of all of my stuff either. LOL

My 2000 H22A4 - Current configuration:

Shortblock: Crower Max-Lite rods, Mahle Gold Series 11.5:1 pistons, UR lightweight under-drive crank pulley - otherwise, stock.
Head: Crower dual valve springs and Ti Retainers, Ferrea Comp Plus valves (stock size), custom ground Crower 3+ (my own specs) cams, gasket matched intake ports and smoothed short turn/bowls (No CNC porting).
Intake/Exhaust: Custom 3" Cold Air inlet pipe/air box, Edelbrock 65mm T/B, Custom Skunk2 Pro Series Intake Manifold (shortened runners to fit in the Civic chassis), Danny Tran (DTR)/Six Sigma Racing 4-2-1 header, Thermal 60mm Cat-back.

It made 3 HP less on Skunk2 Pro 2's when they first came out compared to the current Crower 3+ cams. The stock (unmodified) intake manifold (other than opening up the inlet for the 65mm T/B) made more mid-range power and the same peak power as the Skunk2 modified Intake manifold... it just doesn't look as pretty, so I left the Skunk2 I/M in the engine bay.

 

Genuine header. Was on the car when I bought it. Was built as a race car in 09, had a stock engine built by Endyn when I got it in 2021, that motor finally gave up the ghost in 2023 after a solid 14 race seasons!

 

Thanks! That sounds like a great build. Good list for reference for my future build. I have a box full of parts similar to your H22, rods, Mahle gold, Crower cams, plan to start build this year.