DOHC Mark8 motor into 94' SC...what is needed? - TCCoA Forums
 
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post #1 of 16 (permalink) Old 08-27-2004, 01:44 AM Thread Starter
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DOHC Mark8 motor into 94' SC...what is needed?

I am seriously considering this swap. Can't be that hard right?? Considering the cars are both pretty similar. I assume if I was starting off with a LX 4.6 it would be easier but I'm not so oh well. I have found complete Mark VIII motors for pretty cheap with low miles at wrecking yards and my rebuilt ford 3.8SC is ready to blow again so it is time for me to either get rid of it or fix it. I am not going to stick another 3.8 SC motor in there again. Here are my questions:

1. What all would I need to do this?
2. How could I find wiring diagrams for the ECUs?
3. What year Mark8 motor would be best/easiest to use... I have read that some use IRCMs or something like that and others have had problems making those work??
4. Would it be best to find a complete Mark 8 car rather than piecing it all together?

Thanks in advance for any info.

94' SC auto
93' Cobra
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post #2 of 16 (permalink) Old 08-27-2004, 01:55 AM
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here are a few links
http://forums.tccoa.com/showthread.p...highlight=dohc
http://forums.tccoa.com/showthread.p...highlight=dohc
http://forums.tccoa.com/showthread.p...highlight=dohc
there are a number of other posts floating around
hit the button for the others
hope that helps

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post #3 of 16 (permalink) Old 08-27-2004, 05:30 AM
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SAVE THE SC. Buy a really cheap 3.8 and make the swap. You will thank yourself in the future.

--Craig
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post #4 of 16 (permalink) Old 08-27-2004, 06:58 AM
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Quote:
Originally posted by Craig-and-Molly
SAVE THE SC. Buy a really cheap 3.8 and make the swap. You will thank yourself in the future.

--Craig
I'm going to second that! The 94/95 SC's are so rare (even if it is an auto) that it's a shame to do that kind of a swap.

You could probably sell the SC and recoup anough money to buy a V8 car to start with.

Just my .02.

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post #5 of 16 (permalink) Old 08-27-2004, 07:01 AM
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post #6 of 16 (permalink) Old 08-27-2004, 08:26 AM
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*ducks the stuff that is about to be thrown at him*

Get rid of that unreliable head gasket eating thing. Do the swap. The 94 SC was EEC IV the 93-95 Mark VIII's were EEC IV so you should be able to use the Mark VIII PCM fairly easily and not have to worry about making other arrangements to make the IMRC's work then. I don't know exactly how much wiring would be involved still though. The big 40 pin engine connector is still on the wrong side of the Mark VIII engine so you would still need to lengthen all the wires on the Mark VIII engine harness. I don't know how much wiring you'd have to add to the car to account for having the correct number of fuel injectors. I also don't know if you would have to change the relay module for the fan or the A/C switch or stuff like that. Look up my wiring notes to see what stuff I used and then go check to see if that is the stuff you have or if you would have to do some major work. There are some things out there that will help you out and there are some things where you'll be a pioneer. But I definitely can't blame you for wanting to improve one of those seksi 94/5 SC's. I think you'll be much happier in the end just from the shear piece of mind of not having to worry about your headgaskets going and taking the engine bearings with them ever again.

Former owner of 94 Bird with DOHC 4.6L swapped from a mark VIII

2011 CTS-V Wagon
1968 Torino was an original 289, C4, fully documented numbers matching car. Now: DOHC 4.6L/T-56 swapped, Cobra intake, IMRC delete, BBK long tubes and H pipe. Dynotech Aluminum Driveshaft, 9" rear with TrueTrac and 4.11's.
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post #7 of 16 (permalink) Old 08-27-2004, 11:22 AM
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Quote:
Originally posted by Rich95XR7
Me too!

Quote:
Get rid of that unreliable head gasket eating thing. Do the swap
I haven't encountered headgasket problems nearly as much on supercoupes like the N/A version 3.8. The supercoupe had way better heads. Personally I would leave a supercoupe a supercoupe as they were the highest model of our cars. Changing it to a 4.6 would actually destroy it's value and gain very little if any. The money would be better spent in upgrades to the supercoupe than in changing the motor. Instead of paying top dollar for a ford reman engine I would have a reputable machine shop build the engine for me. I have changed 2 supercoupe engines and both had lower end failure. I couldn't tell you how many heagaskets I have replaced on N/A 3.8's

OMG did I just recommend keeping the v6?
Alan
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post #8 of 16 (permalink) Old 08-27-2004, 12:11 PM
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I've seen some headgaskets let go pretty spectacularly on a SC.

One of the guys here finally saw the light. He spent tons on his SC and he was disappointed, he really didn't have anything left to do to it and it had some issues and he just straight got tired of the 3.8. So he said screw it, 347 stroker time. If you do the DOHC swap, you'll make up all the money you spent doing it in the time it takes you to change your plugs the first time you need to do it. Even the SC's aren't worth all that much, none of these cars are holding any value. So, do what you want to it.

Former owner of 94 Bird with DOHC 4.6L swapped from a mark VIII

2011 CTS-V Wagon
1968 Torino was an original 289, C4, fully documented numbers matching car. Now: DOHC 4.6L/T-56 swapped, Cobra intake, IMRC delete, BBK long tubes and H pipe. Dynotech Aluminum Driveshaft, 9" rear with TrueTrac and 4.11's.
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post #9 of 16 (permalink) Old 08-27-2004, 12:28 PM
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But some people like to collect cars... I wish to god I could afford and get my hands on a SC with a 5 speed!
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post #10 of 16 (permalink) Old 08-27-2004, 12:40 PM
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Quote:
Originally posted by 4 Cam Bird
*ducks the stuff that is about to be thrown at him*
And obviously rightly so.....

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post #11 of 16 (permalink) Old 08-27-2004, 01:22 PM
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there's a 93 mark engine here in the yard for 350 bucks. little bit over 100k miles and i'm still thinking.....

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post #12 of 16 (permalink) Old 08-27-2004, 06:03 PM Thread Starter
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It is true that the 94/95 sc is somewhat rare, but I would prefer a more reliable motor in this car. It has no resale value what so ever. I was only going to get $2800 for a trade in on it so I am starting to think about this motor swap idea. Besides, I can only keep one "rare" car completely stock at a time (93' Cobra).

Just not sure if I want to go with the trusty 5.0L or DOHC. I like the DOHC idea because I know my trans will bolt up to it but I don't think the 5.0L will? At this point, I am trying to find out which route would be easier/cheaper.

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post #13 of 16 (permalink) Old 08-27-2004, 06:16 PM
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the easiest and cheapest route is to leave that beautiful bird alone and garage her, wax her, wash her, never in the rain/snow/etc. No selling! Selling of Thunderbird SuperCoupes is forbidden! Unless your selling it to me!
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post #14 of 16 (permalink) Old 08-27-2004, 06:28 PM
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Quote:
Originally posted by bigcletus94
I like the DOHC idea because I know my trans will bolt up to it but I don't think the 5.0L will?
You've got that backwards. The 3.8/4.2/5.0 share the same bellhousing bolt pattern, the 4.6/5.4 have a different bellhousing bolt pattern.

If it wasn't a 94-95 SC, I'd say go for it. But as it was mentioned above, the 94-95 SC's were pretty rare, and I know that there are quite a few people here and on sccoa that would love to have one.

I've just about finished the 4.6L DOHC swap on my 90 XR7, but I completely rewired the entire car as a 97 4.6L Tbird.

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post #15 of 16 (permalink) Old 08-28-2004, 03:04 AM
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The automatic makes it a good car for a V8 swap. If it was a 5-speed it would make it a good parts car for you to sell all the 5 speed parts to me

Boosted 3.8L's are a great idea. Buick did a fine job of it. Ford made a headgasket eating monster.

Former owner of 94 Bird with DOHC 4.6L swapped from a mark VIII

2011 CTS-V Wagon
1968 Torino was an original 289, C4, fully documented numbers matching car. Now: DOHC 4.6L/T-56 swapped, Cobra intake, IMRC delete, BBK long tubes and H pipe. Dynotech Aluminum Driveshaft, 9" rear with TrueTrac and 4.11's.
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post #16 of 16 (permalink) Old 08-29-2004, 12:16 PM
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coy miller stage II! i bet those engines wouldnt have issues with blowing pieces, maybe, maybe not, i dont know, thats what i would do if i had an SC, coy miller baby

the 4.6 swap is a cool one to, its a shame to butcher a SC like that, but its your car, if your gonna keep it and drive it, what does it matter?

do the 4.6 swap depending on how much itll cost, im sure its wayyyyyyyyyy less then my idea of a good Supercoupe engine swap

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