I need a list of parts needed for a 3g swap - Honda Prelude Forum

FireTyrant · 10-30-2010, 06:12 PM

First off my gf's dad has got a 91si with a b21 in her. She's starting to go through 4 quarts of oil a week and that's starting to get a bit much. So he wants to put an h22 (usdm or jdm) in her. So I need a complete list of parts for him and as many resources as possible. I need everything from electrical, mechanical, to suspension.

This is what I know so far or think I do.

1. Engine
2. Mounts
3. Harness (Boomslang or Rywire)
4. ECU (unsure which one)
5. SRI or CAI (intake)
6. Radiator (unsure)
7. Transmission (unsure if the one from the b series will bolt up with adapter plate)
8. Shift Linkage (If I have go to with a different transmission)
9. Axles

That's the list of stuff I think I need. But I am also looking for websites for him to read on so he can decide if this is really worth it or not. I've got a 5th gen prelude and I really only know about stuff for those cars, but 3g's I am even more of a newbie. Please do not tell me to continue searching cause I really have looked around, I'm asking cause now I need someone to help me out by finishing the list with great resources to read on. Thank you very much.

Colfax · 10-30-2010, 10:28 PM

If you are really interested in the h22 swap, go over to preludepower.com and look at the 3rd gen FAQ sticky. There are a lot of h22 swapped guys there, and you should be able to find quite a bit of help there for this swap.

merlindavis · 11-01-2010, 02:25 PM

To clear up a few of the questions on that list:

The 3g B-series motors might as well be there own series of motors. Very little from any other B-series motor will bolt up, thus anything that any other B-series part can bolt on to, adapter plate or not, probably isn't going to fly with your current hardware.

As far as the shift linkage goes, you may or may not be able to get away with using the existing linkage. IIRC, the linkage assembly on the 3g and the assembly on a 4g/5g are essentially mirrors of each other. I could be wrong though, it's been a long time since I've really done any research regarding anything to do with Preludes.

For the ECU, an OBDI (93-95, I believe) is going to be your best bet, since your 91 already has essentially everything it needs to be a plug and play operation. However, everything changes if you're going to flash it.

In all honesty, though, this particular site isn't the resource it used to be for 3g's.