working h22/h23 hybrids - Honda Prelude Forum

luderacr14 · 02-13-2003, 03:43 PM

There are way too many horror stories going around about these head swaps for me to dump all my money into this. I was wondering how many people out there have successfully completed this swap, and how much it ended up costing them. I have about $1500+ sitting in my bank acount ready to be put in my car. I only have intake and exhaust and a short shifter comin in the mail. I want the VERY BEST bang for the buck. I also heard that crower is coming out with actual billet cams(not regrinds) for the h23. I dont know when, but this might be a good investment if i want to keep my car very dependable.
Thanks for all of your help.

ECHprelude · 02-13-2003, 03:47 PM

do a search, there is plenty of write-ups on the swap on this site. also try the NA forum.

Satan_SRV · 02-13-2003, 06:28 PM

NA forum

Satan_SRV · 02-13-2003, 07:52 PM

Okay give me some specifics....

Basically an H23 block is a big crank, spinning that big crank to 7400rpms is not good in the long run. It's not as reliable. There's a reason why the VTEC engine was made a 2.2 instead of a 2.3. It took them 8 years to confidently build a 2.3 VTEC.

It works, and the torque is nice, but it's not reliable in the long run, unless you're nice to your car, but I'm not.

Satan_SRV · 02-13-2003, 08:13 PM

H23 pistons info H23A piston question

H22/23 hybrid info H23 VTEC H23VTEC H22/H23 H22a/H23a Hybrid

Omega3001x · 02-13-2003, 09:17 PM

does that .1 liter make that big of a difference of what rpm it can spin up to? i was amazed to see the redline of a 3.2L NSX is 8,000rpm. thats a lot bigger than a 2.3 and its plenty reliable. right?

ECHprelude · 02-13-2003, 09:53 PM

also has 2 more pistons.

Satan_SRV · 02-13-2003, 10:08 PM

Quote:

Originally posted by ECHprelude
also has 2 more pistons.

LOL

omega it's not about displacement, it's about stroke.

Forbidden · 02-14-2003, 10:24 AM

Like Satan said it's not about displacement, it's about stroke.

H22 = 90.7mm
H23 = 95mm
NSX (C32 I think) = 78mm

Also the NSX has 6 pistons so it has more displacement because of the 2 extra pistons and also the bore in the NSX engine is 94mm compared to 87mm for the H22/H23

If the NSX had 4 pistons with this bore/stroke configuration it would be a 2.2L engine so displacement per cylinders is pretty much the same in both engine except that the pistons in the NSX are 7mm larger than the H22/H23 so it can have that 78mm stroke to allow it to spin higher

Brady92/4WS · 02-14-2003, 01:40 PM

NSX (3.2 liters of displacement)/(6 pistons) = .533 liters per cylinder

H22 (2.2 lod)/(4 p) = .55 liters per cylinder

Pretty similar...

Satan_SRV · 02-14-2003, 02:42 PM

DOHC VTEC owns

SikRedRX-8 · 02-14-2003, 03:52 PM

I got rid of a boosted H23 for a h23vtec, and love it. But be prepaired to spend some money.

MLagow20 · 02-14-2003, 06:13 PM

I just had the H23A put in and I love it... the torque is incredible.

but is this engine is not as reliable as the H22?

Satan_SRV · 02-14-2003, 07:53 PM

Quote:

Originally posted by MLagow20
I just had the H23A put in and I love it... the torque is incredible.

but is this engine is not as reliable as the H22?

We're talking about the hybrid H23 VTEC.

I think your JDM H23A VTEC is built with some solid internals for crnak and rods....I think you'll be fine..

Like if was ever going to build another H23 VTEC I'd use the crank from the motor you have.

slp mode · 02-14-2003, 08:26 PM

still going!!!

stock internals!!

Forbidden · 02-15-2003, 09:45 AM

slp mode: how long have you had it? Do you rev it to 7400RPM at least?

MLagow20 · 02-15-2003, 11:25 AM

Quote:

Originally posted by Satan_SRV

We're talking about the hybrid H23 VTEC.

I think your JDM H23A VTEC is built with some solid internals for crnak and rods....I think you'll be fine..

Like if was ever going to build another H23 VTEC I'd use the crank from the motor you have.

Ahh... I just read the last post and saw someone say h23Vtec... But that is good to know, cause I was getting parinoid and was worried about the fact that just dumped all this money into the engine and it not being worth a damn.

But thanks for the info

93si4ws · 02-15-2003, 12:55 PM

yea how many miles does everyone have? i have to go check mine..

slp mode · 02-16-2003, 09:04 AM

Quote:

Originally posted by Forbidden
slp mode: how long have you had it? Do you rev it to 7400RPM at least?

I'ts been running strong now for about 5000 miles, I drive it very hard shift at 7800 most of the time depending on the situation, but have shifted at 8000 quite a bit, but mainly it's 7800.

slp mode · 02-16-2003, 09:15 AM

This swap is has gotten a bad rap, my guess is that people just dropped a h22 head on there h23 without checking out the bottom end. These bottom ends are stronger than alot of you realize.When they are in perfect working order. I have done my own research and have talked to honda mechanics, tuners and what not. But everyone that has the problems just blames it on the swap and says that it's unrealiable. Half the time it's tuning issues or biulding issues. At the time of my swap I had a major tuning issue and building issure. I just didn't give up and say the swap was a joke. I had alot of helped and got them worked out.
And now it runs perfect, and if a motor is going to brake it's going to brake the way I drive it. I have even mis shifted on the freeway racing a wrx, and over revved to 9000. It happens to the best of us. I am rambling I'm sorry. anyway I just think this swap is a great cost effective way to make power if you are only a h23. Also I have a 70 shot of Nos and spray all the way until 7800. so there is more proof.