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Author Topic: sd4 engine  (Read 1922 times)

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Offline shredeagle

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sd4 engine
« on: October 24, 2013, 01:04:04 AM »
I came across a pontiac sd4 complete running engine  I was thinking of putting in my 81 sx4. im just not sure what such an animal would be worth . any input would be helpful . thanks.........

Offline captspillane

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Re: sd4 engine
« Reply #1 on: October 25, 2013, 09:25:17 AM »
The Pontiac Super Duty Iron Duke's were usually 1980 and newer, which means that they will not bolt to your Eagle transmission bellhousing. The newer ones can only use light duty "60 degree" GM transmissions. I like that our Eagles can use heavy duty cheap SBC transmissions like the 700R4. The Pontiac engines were only called "Super Duty" because of how much bigger and stiffer the crank was in comparison to a normal Iron Duke. It was an expensive upgrade at the time but I wouldn't pay much for one now because of how commonly available those super duty cranks are. Every single Mercruiser Marine Engine has the same crank. I've got 3 Mercruiser motors so far for $300 total. They're very common and very cheap once the boat rots out from around them.

I also prefer to use the Mercruiser blocks because they have a factory overbore available. The first Merc Iron Dukes were 2.5L but eventually they offered a factory 3.0L stroker version too.

The biggest problem with the Merc blocks is partially an advantage. I like the non-cross flow head. It opens up the crammed passenger side and makes the Iron Duke much easier to maintain and work on. You lose a small amount of flow advantage to the cross flow heads, but I think it is worth it to me. I'm using factory manifolds from a '77 or '78 Iron Duke and it wouldn't be hard to make your own headers if you couldn't find a set.

Alternatively you could rebuild the Eagle engine with the internals from a 2.5L Mercruiser engine to make your own Super Duty Eagle engine. The donor engine will probably cost about $100, so you'll probably have more in the rebuild kit then the Super Duty hardware itself. If you get the Pontiac Super Duty motor for less than $200 you'd probably be best to move those parts over to the Eagle block anyway, so it's about the same deal.
« Last Edit: October 25, 2013, 09:27:43 AM by captspillane »
Currently Inspected and Insured as of Jan 2013:
-1985 Eagle Station Wagon 258 T5 Stickshift
-1980 Eagle Station Wagon 258 Auto Fuel-injected with GM TBI

Minor Repairs Underway:
-1982 Eagle SX4 258 T5
-1981 Kammback 2.5L Iron Duke T5

Restoration Efforts Near Completion:
-1982 SX4- 401 NV3550
-1983 SX4- 4.5 MPI NSG370 (6 Speed)

Restoration Efforts Underway:
-1985 SW- 4.0 MPI AX15
-1982 SX4- 4.0 AW4
-1981 SX4- SD33T NV4500 (Turbodiesel 5 speed)

Future Rescue Efforts- '85 Maroon SW, '87 Limited SW, '84 Limited SW, '87 4 door Sedan, '81 2 door Sedan, '88 White SW, '77 4 door Hornet, '74 2 door Hornet, '79 Spirit AMX, '81 Kammback.

RIP- Red '81 SX4, '84 4dr Sedan, '84 SW, '81 SW, '80 Spirit, '83 SW, '83 4dr Sedan

Offline shredeagle

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Re: sd4 engine
« Reply #2 on: October 26, 2013, 12:46:40 AM »
thanks so much for the info. I was led to believe the sd4 was a bolt in replacement. the guy wanted 3000 bucks for it. I would like to talk to you more about the mercruiser options if that's ok with you ? thanks again..........

Offline captspillane

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Re: sd4 engine
« Reply #3 on: October 26, 2013, 11:54:19 AM »
I've actually written alot of the information down in this thread, here in the same section of this forum. There is even a side by side picture of a Mercruiser crank next to the stock Eagle crank. It is visually obvious that it is stronger.

http://forums.amceaglesden.com/index.php?topic=38412.0
Currently Inspected and Insured as of Jan 2013:
-1985 Eagle Station Wagon 258 T5 Stickshift
-1980 Eagle Station Wagon 258 Auto Fuel-injected with GM TBI

Minor Repairs Underway:
-1982 Eagle SX4 258 T5
-1981 Kammback 2.5L Iron Duke T5

Restoration Efforts Near Completion:
-1982 SX4- 401 NV3550
-1983 SX4- 4.5 MPI NSG370 (6 Speed)

Restoration Efforts Underway:
-1985 SW- 4.0 MPI AX15
-1982 SX4- 4.0 AW4
-1981 SX4- SD33T NV4500 (Turbodiesel 5 speed)

Future Rescue Efforts- '85 Maroon SW, '87 Limited SW, '84 Limited SW, '87 4 door Sedan, '81 2 door Sedan, '88 White SW, '77 4 door Hornet, '74 2 door Hornet, '79 Spirit AMX, '81 Kammback.

RIP- Red '81 SX4, '84 4dr Sedan, '84 SW, '81 SW, '80 Spirit, '83 SW, '83 4dr Sedan

Offline carnuck

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Re: sd4 engine
« Reply #4 on: October 26, 2013, 11:18:47 PM »
You CAN use the 904 off the AMC 4 cyl  (909 if it's lockup) from '83 Up Eagle and '84 up Cherokee/Comanche 4 cyl or 2.8 V6 or AX-5 from the std trans ones. The flexplate/flywheel is another issue as well as exhaust, mounts, etc, but the bell pattern is 60 degree GM.
AMC/Jeep gauges are for amusement only. Any correlation between them and reality is purely coincidental!

 

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