5th Gen SH to JDM H22 Base Swap Diary - Honda Prelude Forum

97BB6sh · 06-08-2006, 12:11 AM

I started working on this about a week now.
getting stuff done little bit at a time.
I'm going to need a lot of help from experts here on the forum, so please bare with me and help me out with my swap

i took pictures both SH and JDM H22 (OBD I) engine.

here is picture of oil pump/balancer shaft housing, which needs to be changed out.

USDM SH(i took the CKP/TDC sensor off on the picture)

JDM

Pic of alternator

USDM SH

JDM

Pic of Intake manifold:
Locations of the vaccum lines are different, and also the IAC valve design is different as well.

USDM SH

JDM

Pic of throttle body:

USDM SH

JDM

97BB6sh · 06-08-2006, 12:16 AM

here are some goodies that are going into new engine.

Mugen Header
Mugen Fan switch
Mugen Thermostat
Unorthodox Racing Flywheel
Unorthodox Racing Pullies (Crank, Alternator, and PS)
Clutch Masters Stage 3 (I know it's over kill but i had this for turbo and never used it)
Manual Tensional Conversion
Balancer shaft removal plates
Hondata IM gasket
ES Motor mount inserts

97BB6sh · 06-08-2006, 12:24 AM

i was reading other 5th gen SH to JDM h22 and i could find anything about VSS.
what do i have to do with this?

My SH tranny looks completely different from the JDM one.
here is the picture.

First pic is the USDM SH Tranny

This second one is the JDM Tranny

What do i need to do in order to make this work?
It seems like it has oil lines on the sensor

Artifex · 06-08-2006, 12:35 AM

Quote:

Originally Posted by 97BB6sh

What do i need to do in order to make this work?
It seems like it has oil lines on the sensor

Uhh, normally people figure out what they need before they start working.

Are you using your SH tranny?

97BB6sh · 06-08-2006, 12:41 AM

Quote:

Originally Posted by Artifex

Uhh, normally people figure out what they need before they start working.

Are you using your SH tranny?

No, i'm using JDM tranny, so i'm taking out ATTS completely.
Even if i want to use ATTS, i can't, since block mountings are different.

I read couple thread about conversion but i didnt find anything about VSS.
I guess i didnt research enough

Artifex · 06-08-2006, 04:49 AM

Quote:

Originally Posted by 97BB6sh

No, i'm using JDM tranny, so i'm taking out ATTS completely.
Even if i want to use ATTS, i can't, since block mountings are different.

Ok good, I wasn't sure if you knew that or not.

I've never worked directly with an SH, but I do know the axles are different between the base model. You will at least need 5th gen base or 4th gen axles.

Tranny wise, I don't think there are any major problems swapping one for the other. However, it looks like the JDM tranny you have has lines for the speed sensitive power steering lines. That's what the 2 pipes next to the VSS are for. You will need to swap in your SH VSS. It's real easy, takes 60 sec.

I would keep your SH alternator, it will make the wiring simpler. You may just want to keep your entire intake manifold assembly. You may need the US version for emissions versions. There is no significant difference between the US and JDM intake assemblies.

97BB6sh · 06-08-2006, 06:21 AM

Quote:

Originally Posted by Artifex

Ok good, I wasn't sure if you knew that or not.

I've never worked directly with an SH, but I do know the axles are different between the base model. You will at least need 5th gen base or 4th gen axles.

Tranny wise, I don't think there are any major problems swapping one for the other. However, it looks like the JDM tranny you have has lines for the speed sensitive power steering lines. That's what the 2 pipes next to the VSS are for. You will need to swap in your SH VSS. It's real easy, takes 60 sec.

I would keep your SH alternator, it will make the wiring simpler. You may just want to keep your entire intake manifold assembly. You may need the US version for emissions versions. There is no significant difference between the US and JDM intake assemblies.

Thank you very much for the reply, i didnt know what the hell that line was for.
Now i can take it out and swap without worries.

I was going to swap all the other stuff like you said:
Alternator
IM/TB
Distributor
Wiring Harness
oil pump/balancer shaft housing
Knock sensor

I knew the axles have to be changed out but would 4th gen axle fit on the 5th gen? I thought i could only put in 5th gen axle.

ThatPreludeGuy · 06-08-2006, 08:31 AM

^^^ If I wouldve actually done my swap I'd be able to give more help but I can tell you that it works and isnt much of an issue. I pulled the ATTS ECU and that stopped the ATTS light in the dash and from what I've read a number of times youre on teh right track. The only thing I can add would be moving the thermostat housing from the current motor to the new one since it mounts the external coil. You also want to retain the current injectors unless you're going to wire in teh resistor pack for the JDM ones, since you're swapping the IM/TB I'm sure just leaving the injectors and fuel rail there will be the easiest route.

Did you go for a JDM LSD trans?

marcucci · 06-08-2006, 09:48 AM

Axles IIRC don't swap from 4g to 5g due to being a little shorter (narrower track on 4g).

Be careful w/the knock sensors. They are INCREDIBLY delicate. You can sell the one coming off of the donor to a 4G owner and make some cash back (assuming you don't break it!).

97BB6sh · 06-08-2006, 05:54 PM

Quote:

Originally Posted by marcucci

Axles IIRC don't swap from 4g to 5g due to being a little shorter (narrower track on 4g).

Be careful w/the knock sensors. They are INCREDIBLY delicate. You can sell the one coming off of the donor to a 4G owner and make some cash back (assuming you don't break it!).

shoot a lil too late...
i broke the knock sensor when i was taking off the wiring harness...
sigh... looks like i have to hit "personal classified" section again for this one.

i just noticed these are INCREDIBLY delicate... damn it!

thanks for the heads up though

97BB6sh · 06-08-2006, 05:55 PM

Quote:

Originally Posted by ThatPreludeGuy

^^^ If I wouldve actually done my swap I'd be able to give more help but I can tell you that it works and isnt much of an issue. I pulled the ATTS ECU and that stopped the ATTS light in the dash and from what I've read a number of times youre on teh right track. The only thing I can add would be moving the thermostat housing from the current motor to the new one since it mounts the external coil. You also want to retain the current injectors unless you're going to wire in teh resistor pack for the JDM ones, since you're swapping the IM/TB I'm sure just leaving the injectors and fuel rail there will be the easiest route.

Did you go for a JDM LSD trans?

I couldnt find LSD tranny, no one had one in stock...
my parents are really really rushing me to get this car out of the garage so i couldnt wait.

ThatPreludeGuy · 06-09-2006, 09:56 AM

Quote:

Originally Posted by marcucci

Axles IIRC don't swap from 4g to 5g due to being a little shorter (narrower track on 4g).

Be careful w/the knock sensors. They are INCREDIBLY delicate. You can sell the one coming off of the donor to a 4G owner and make some cash back (assuming you don't break it!).

What would occur with a damaged or broken knock sensor installed?

marcucci · 06-09-2006, 11:21 AM

I'm not sure if you will get spurious CELs, I think you will (either false knock if broken, or a complete failure if not there). You won't pass an OBD2 emissions inspection this way.

You probably won't find one in the classifieds section. I'd hit Majestic and be done with it. IIRC it's in the Cylinder Block listing.

ThatPreludeGuy · 06-09-2006, 02:50 PM

Ok, just checking that they didnt jack mine up and caused my misfire condition during my swap.

97BB6sh · 06-10-2006, 03:26 PM

Quote:

Originally Posted by marcucci

Axles IIRC don't swap from 4g to 5g due to being a little shorter (narrower track on 4g).

Be careful w/the knock sensors. They are INCREDIBLY delicate. You can sell the one coming off of the donor to a 4G owner and make some cash back (assuming you don't break it!).

yeah i'll probably have to order one..

thanks for the info

97BB6sh · 06-11-2006, 08:19 AM

I took the pic of old clutch and flywheel and clutch.
flywheel is very rusty, and clutch disc is almost down to zero, yet the springs on the clutch is not popped out.

is this normal condition for JDM engine?
how many miles would you suspect from this engine?

ThatPreludeGuy · 06-11-2006, 09:34 AM

It's very difficult to say from something like rust and a worn clutch, the rust is from sitting for so long and the clutch can be from a bad driver. My motor was labled at with its mileage when I picked it up, and it was a genuine tag as opposed to something someone just slapped on it.

Artifex · 06-11-2006, 03:32 PM

Quote:

Originally Posted by 97BB6sh

I took the pic of old clutch and flywheel and clutch.
flywheel is very rusty, and clutch disc is almost down to zero, yet the springs on the clutch is not popped out.

is this normal condition for JDM engine?
how many miles would you suspect from this engine?

You can't tell that sort of thing by looking. All reputable motor shops I know of will tell you the mileage of the motor when you buy it. Did yours come with mileage info?

97BB6sh · 06-11-2006, 05:55 PM

hmmm mine didn't....

97BB6sh · 06-20-2006, 06:07 AM

it's been about a week since i posted it.
I've been lil lazy last week.

anyways here are some more pics.

i've never seen this mensioned before, but power steering bracket is different.
So, i swaped power steering bracket.

also, i installed bb6 distributor, new cap and rotor, UR flywheel, and mugen header (well, top half)

here are my Clutch Master stage 3 clutch and pressure plate, along with my UR flywheel, and rusted stock one.