GO for it dude! I'm behind you as i am beefing my duke as well!

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Tristan
84 Fiero SE

Excuse my ignorance. What's SD?

-Michael

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"A guy know's he's in love when he loses interest in his car for a few days." -Tim Allen

SUPER DUTY, its the upgraded racing motor from pontiac, its a super strong 4 cylinder (SD4). There was an SD6 but thats a different story.

awesome. thanks. I'd heard of the Super Duty but I didn't make the connection. I understand there's more than one kind of duke, but is there some thread that explains them and their history and compatability? Or I can just have you guys tell me it all I'm hoping to rebuild my '84 duke within the next few years so I'm trying to learn all I can before I do. Can you rebuild a regular Duke completely w/ SD parts? And who sells them?

-Michael

quote Originally posted by Fierology: awesome. thanks. I'd heard of the Super Duty but I didn't make the connection. I understand there's more than one kind of duke, but is there some thread that explains them and their history and compatability? Or I can just have you guys tell me it all I'm hoping to rebuild my '84 duke within the next few years so I'm trying to learn all I can before I do. Can you rebuild a regular Duke completely w/ SD parts? And who sells them? -Michael

Michael, go to my site and you will see my Super Duty parts and link and other pages. All parts can interchange between Duke and Super Duty.

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My sites
http://the-stickman.tripod.com

http://www.youtube.com/TheStickman

<------------------------------ Somebody had to BUMP this thread

yes someone did have to bump this thread because my duke is completely in pieces and it would be cool to get a few extra horses out of it. So, from the people who have done so, what is the best and reasonably priced heads and shafts etc to use without doing much modification to anything else?

While I find this post very interesting I remain skeptical that a Duke can be modified to make Horsepower and stay together. I hope that you prove me wrong but I say the top level of power than a Duke engine can hold is about 125HP.

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87GT - 3800SC Series III engine, 3.4" Pulley Flotech Exhaust Autolite 104's 4T65eHD
87GT - 3.4L Turbocharged engine, modified TH125H
" I'M ON THE LOOSE WITHOUT THE JUICE "

I'm willing to bet cash that if you destroke a Duke to under 2 litres, you could get some decent mods done to it. I read in a tech article that a 4 banger that displaces anything over 2.0 L makes a secondary vibration, as been stated numerous times here. And that vibe causes twisting forces on the crank. So, destroke it and maybe get rid of the 2ndary forces acting on the crank, then try to turbo the beast! YEAH!!

That's my thought, not fact.

super duty's came all the way up to 3.2 liters and made lots of power. of course it shares little with the duke. but it is still a 4 banger

quote Originally posted by AquaHusky: II read in a tech article that a 4 banger that displaces anything over 2.0 L makes a secondary vibration, as been stated numerous times here. And that vibe causes twisting forces on the crank. That's my thought, not fact.

And that's why they put counter-balance shafts on 88 dukes. Maybe you can get more than 125hp if you start with an 88 duke.

So if you replace the shafts in a pre-88 wouldn't that produce the same result? would I have to make sure it is balanced?

Maybe so but 88 cranks don't have provisions for a distributor but a crank sensor instead. Id think it would be far easier to start with an 88. Might working in an 87 but still lots of work.

BUMP to mrossum for update on the new 87 coupe.

Iron Duke Resource site.
Kansas Racing Products, source of SD4 clone engines and parts.

quote Originally posted by vortecfiero: I think i recall the race superduty injected 2.7 engines in the IMSA Dole Huffaker fieros making 275 hp at 6000 RPM for about 30 hrs then rebuild time. On a side note I know someone in Toronto that has two of them, never been run.. Kinser injection and all. They were a SD dealership's display engines and they were almost complete. *Grins soooo evily (no not me... yet ?)

yes but the IMSA Engines are dual overhead cammed. a guy was selling the head and all parts minus the block for $2500 about 3 weeks ago. I was half tempted but instead I bought yet another fiero for about $1000 that ran and drove just fine as a spare.
I draw the line at a single performance upgrade costing more that a duplicate car.
however any Fiero with an Iron Duke in it that can stay with a v8 or swap car would be worth every penny. as long as parts are easy to come by.

Also to add, my condolences on your loss man, if that happened to my Duke I'd be crying like a little kid who lost their bright red ballon that he got from that nice man at the Fair ;-(

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1987 Fiero Auto Base Coupe 56k Original Miles
1988 FIERO Coupe "IRON DUKE" 5-Speed (the show car ;-)
1992 Firebird T-Tops V-8 24k original Florida miles(collectors car)

Yet another great thread being added to my favorites! Thanks guys!