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Old 05-30-2011, 06:55 PM   #1
VDUB
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1991 SC2
Default 96 DOHC engine and PCM transplant into a 91 SC2...

My daily driver 91 SC2 is in need of a new engine.

Doner car is a 96 SL2 with an auto trans. Bought the car for $160 a few years ago. Couldn't pass it up as a parts car. They said the engine was blown... It wasn't !!

Transplant recipient is my 91 SC2 with a manual trans. I learned a hard lesson on this one. I guess that when you replace the head gasket in the 91 you need to remove the oil restrictor from the block to prevent oil starvation to the head. My head must have gotten pretty hungry because it ate the upper timing chain guide.

Long story short. I need my commuter car back up pretty quickly and I have the motor and complete vehicle wiring harness pulled from the 96 already.

What am I in for?

I know I need the 96 PCM because of the crank in the 91. Will the 96 auto PCM work with the manual trans in the 91? Is it in my best interrest to replace all the wiring in the car?

I have this week off to get this done. Any encouraging advise would be appreciated.

Thanks

...
1991 SC2 215k


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Old 05-30-2011, 08:17 PM   #2
madpogue
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1996 SW2
Default Re: 96 DOHC engine and PCM transplant into a 91 SC2...

You're in for a different engine, or a different host car. There's no PCM that will drive the '96 powertrain and a '91 cluster.

Why not just drive the '96 car? If you want a manual, you could swap the tranny from the '91 car into the '96, and get a DOHC manual PCM.

The '91 is a SC, BTW; there was no SC2 then.

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Old 05-30-2011, 08:25 PM   #3
alordofchaos
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1998 SL2
1997 SL2
Default Re: 96 DOHC engine and PCM transplant into a 91 SC2...

Took a quick look at the manual to automatic trans swap and I believe you should be OK with the 96 auto pcm and a manual trans (not sure if you swapped over all the cruise parts whether they would work)
http://www.differentracing.com/tech_...anny_swap.html

But there are other things you have to watch for. For example, your 96 is OBD II and your 91 is OBD I. I don't think your 91 has any provision for a top mount but I suspect you may be able to install it in there with some drilling. There were some other funky things with the 91-92 which I can't recall offhand; something to do with the cradle?.

yeah, different cradles http://saturnfans3.saturnfans.com/~s...d.php?t=152338 other info there, too

a good thread to read http://www.saturnfans.com/forums/sho...d.php?t=105578 Low Saturn list some possible scenarios

You may want to look in the swap guide sticky, or over on sixthsphere or the saturnwiki for their swap guides.

...
I'm not worthy to grovel in the shadow of Signmaster's wisdom

11/2016 red 2002 5 spd SC2 124k DD
7/2010 Craigslist white 1997 SC2 project
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Last edited by alordofchaos; 05-30-2011 at 08:38 PM..

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Old 05-30-2011, 08:39 PM   #4
madpogue
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1996 SW2
Default Re: 96 DOHC engine and PCM transplant into a 91 SC2...

Quote:
Originally Posted by alordofchaos View Post
I believe you should be OK with the 96 auto pcm and a manual trans
Any auto PCM in a manual car will throw a perpetual SES light.
Quote:
(not sure if you swapped over all the cruise parts whether they would work)
Gen-2 cruise parts will probably not even mount on a gen-1 wheel.

Quote:
I don't think your 91 has any provision for a top mount but I suspect you may be able to install it in there with some drilling.
That's the other possible deal-breaker. Can you put a '91 mount system on a later engine? Hmm.....

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Old 05-30-2011, 09:58 PM   #5
VDUB
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1991 SC2
Default Re: 96 DOHC engine and PCM transplant into a 91 SC2...

Sorry, should have mentioned that the family I bought the 96 from had kids that thought it would be fun to shoot out all the windows with a sling shot. They did leave me with one of the rear quarter windows, but the rest were shards on the inside of the car. Not to mention the front end is hosed from the guy falling asleep on the highway and ending up in the dirt median.

I will read through the other threads suggested to get a better feel for what I'm getting myself into.

You are correct that the 91 had no top mount, but I believe all the mounts from the 91 engine will fit the 96 block as the blocks are interchangable. The 91 has that funny shock looking mount in the front. I'll confirm in the morning when the sun comes back up. I'm working on this in my dirt driveway...fun.

Other then the relentless Check Engine Light, will it run?

Madpogue, there was no SOHC engine offered in the 91? I though that was what the SC1(SOHC) or SC2(DOHC) stood for? Sorry if I got it wrong.

I have the cluster from the 96 out already as well. I'm pretty handy and creative when I have to be. Maybe I can morph the two together?

I know the engine from the 96 runs because I had it running in my basement. After removing everything from the car, I hooked up the entire wiring harness to everything I pulled from the car. Gas tank, exhaust, PCM, fuse box, auto shifter, IP etc. I basically had the car without the shell. That is how it sits now.

I'll check the other threads now and report back if I'm going to be crazy enough to tackle this project.

Thanks for the input so far gentlemen.

...
1991 SC2 215k


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Old 05-31-2011, 12:04 AM   #6
madpogue
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1996 SW2
Default Re: 96 DOHC engine and PCM transplant into a 91 SC2...

Quote:
Originally Posted by VDUB View Post
You are correct that the 91 had no top mount, but I believe all the mounts from the 91 engine will fit the 96 block as the blocks are interchangable. The 91 has that funny shock looking mount in the front. I'll confirm in the morning when the sun comes back up. I'm working on this in my dirt driveway...fun.
The mount doesn't attach to the block, it attaches to the timing cover. The '91 timing cover is different.

Quote:
Other then the relentless Check Engine Light, will it run?
With enough fabrication, anything's possible. Getting this combination to work will require a LOT of fabrication.

Quote:
Madpogue, there was no SOHC engine offered in the 91? I though that was what the SC1(SOHC) or SC2(DOHC) stood for? Sorry if I got it wrong.
Not in the coupe.

Quote:
I have the cluster from the 96 out already as well. I'm pretty handy and creative when I have to be. Maybe I can morph the two together?
Then you know that the clusters are completely different shapes. This is where the LOT of fabrication comes on. There's ONE guy here, who, many years ago, managed to put a gen-2 entire dash and cluster in a pre-'95 car. And, IIRC, he put a gen-2 engine in it, and of course, had to run the complete wiring harness from the gen-2 donor car. That's the very least you'd need to do to make this work.

Quote:
I know the engine from the 96 runs because I had it running in my basement. After removing everything from the car, I hooked up the entire wiring harness to everything I pulled from the car. Gas tank, exhaust, PCM, fuse box, auto shifter, IP etc. I basically had the car without the shell. That is how it sits now.
Hope you have an EXTREMELY well-ventilated basement.

Another possibility - keep it OBD-I -- IF you can put a vacuum EGR on this head, you could drill out for the temp gauge sender, then find a '93 or '94 cluster, ignition module and PCM, and you'd probably need a '93 or '94 wiring harness. At least with this, you're not fabbing the dash.

You should take a look at how the mount bracket attaches to the spaceframe on a '92-up car. That might be your solution to the engine mount issue.

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Old 05-31-2011, 08:14 AM   #7
2NDSOUT
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1994 SL2
1999 SL
Default Re: 96 DOHC engine and PCM transplant into a 91 SC2...

The Gear Ratios are completely different as well.

See this chart here:

http://www.differentracing.com/tech_...gearratio.html

The 91 SC was designated as an "SC" because the number designation SC1 and SC2, didn't come into play until 1993? I think that is when they intro'd the number designation on the Sports Coupes.

You are going from OBD-2 to OBD-1 and as has been mentioned, unless you can do some serious fabrication to make this work, it will be some work. The 91 cluster has the oil gauge which was discontinued midway into the 92 model year because alot of the people didn't know how to properly read an oil gauge on the dash and some of them didn't work properly either.

...
Bryan

94SL2 HCE, "Pearl"

99 SL

94SL2 260K Miles
1/15

97SW2 266K Miles
2/15

Always
94SC1 340,501 Miles
Org. Engine/Auto Trans
2/97-10/08
Gone 3/12

92SL1
05VUE
91SC

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Old 05-31-2011, 12:11 PM   #8
VDUB
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1991 SC2
Default Re: 96 DOHC engine and PCM transplant into a 91 SC2...

Thanks again for all the input. I believe you all have convinced me to go with option B.

I guess I'll rebuild the 91 engine. It will cost me more then the transplant, but it will be a heck of a lot easier and won't take nearly as long.

Anybody want some 96 SL2 parts...?

Thanks again.

...
1991 SC2 215k


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Old 05-31-2011, 12:27 PM   #9
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1994 SL2
1999 SL
Default Re: 96 DOHC engine and PCM transplant into a 91 SC2...

Quote:
Originally Posted by VDUB View Post
Thanks again for all the input. I believe you all have convinced me to go with option B.

I guess I'll rebuild the 91 engine. It will cost me more then the transplant, but it will be a heck of a lot easier and won't take nearly as long.

Anybody want some 96 SL2 parts...?

Thanks again.
If the Timing Chain Cover is in good shape; I would pay you $50.00 plus the cost of shipping. The Timing Chain Cover on my 97 SW2 is in reasonable shape, butI want to replace it before I go on vacation In July.

...
Bryan

94SL2 HCE, "Pearl"

99 SL

94SL2 260K Miles
1/15

97SW2 266K Miles
2/15

Always
94SC1 340,501 Miles
Org. Engine/Auto Trans
2/97-10/08
Gone 3/12

92SL1
05VUE
91SC

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