Hello does anyone know what the stock rollor cam lift/duration/LC is on the 2.5L iron duke?

Also anyone know or have any head flow data on the stock and ported 2.5L iron duke head?

Thanks

Jim

I have cam specs in the engine section

http://mywebpage.netscape.com/fierost4rsc/fierost4rsc.html

Keep trying to hit the page if netscape is balky

Let me guess: computer engine dyno? I'd like to see all the numbers if you get it to work!

------------------

1984 Fiero SE

quote Originally posted by RWDPLZ: Let me guess: computer engine dyno? I'd like to see all the numbers if you get it to work!

Yes your right If i can get some true head flow Numbers i can give you all a more true dyno.
If i can't get any numbers i may have one flow benched stock and flow bench ported.

I was wanting to dyno the duke with a stock roller cam and with ported and polished head and header. I got 32mpg in town and 36mpg on highway when i had a 2.5l in a 86 fiero with the gass prices going up i have been thinking about getting another one and see what i can do to inprove it.

Thanks for your post

I wonder will the 86-up engines will bolt right into an 84.....they sure had a lot of improvements.

------------------

Yeah, that's kind of what I'm interested too. I think I could fund a pretty decent rebuild of a newer Duke while I drive around on Ye Olde 84 hoping it can go just one more mile further down the road. Hopefully it will and nothing major will need done!

------------------

My Daily Driver :D

Well the 84-86 dukes used a distributor, in 87 they changed to DIS. The 84 had a different valve train (I forget which is which)

quote Originally posted by Key Of David: I wonder will the 86-up engines will bolt right into an 84.....they sure had a lot of improvements.

Yes it will just as lang as it has a dis. The 86 i use to have none of the engines i had in it were from a fiero but from other 2.5L front wheel drive cars and they all bolt in fine for me. The first engine in it was not a fiero engine it was not a roller and i can tell you, you can notice the inprovement over the flat to roller cam.

Here are flow #'s for stock 2.5 head:

Intake
Lift CFM
.100 55
.200 100
.300 128
It flatlines at 130 CFM. It just doesn't flow any more.

Exhaust
Lift CFM
.100 45
.200 77
.300 102
.400 124
.500 131
After .500", no gains on exhaust, either.

I have #'s for a ported Super Duty head, if you want them as well.

Nate

------------------

My Web page | The Turbo Super Duty Build.
You know that little voice that says it can't be done? I duct-taped mine's mouth shut and pushed it down a flight of stairs.

quote Originally posted by RWDPLZ: Well the 84-86 dukes used a distributor, in 87 they changed to DIS. The 84 had a different valve train (I forget which is which)

How much of an impact will that have putting an 86 Iron Duke in my 84?

quote Originally posted by RWDPLZ: Well the 84-86 dukes used a distributor, in 87 they changed to DIS. The 84 had a different valve train (I forget which is which)

Oh yea so then we would have to change our 84 computer wiring because we'd have to change the computers, yada yada.

Maybe the 86 with roller cam is a good compromise then. As already stated there is a different feel even in that.

quote Originally posted by binarycode: How much of an impact will that have putting an 86 Iron Duke in my 84?

Don't expect any gains.

I was trying to find out how much of an impact the different valve train would have while putting a slightly newer Duke into the car. I'm not looking for a big performance gain by doing this. Just something a little better...

quote Originally posted by binarycode: How much of an impact will that have putting an 86 Iron Duke in my 84?

The 86 Iron Duke was a transitional hybrid. It retained the distributor but was the first year to use the roller cam. This DOES provide minimal performance improvement (@3 hp). And it will last a lot longer than a rebuilt 84 motor. But don't expect to notice much of a difference.

quote Originally posted by Toddster: The 86 Iron Duke was a transitional hybrid. It retained the distributor but was the first year to use the roller cam. This DOES provide minimal performance improvement (@3 hp). And it will last a lot longer than a rebuilt 84 motor. But don't expect to notice much of a difference.

The hp does not come in untell you are in upper rpm, for the street torq is what you want torq is what you feel pushing you in the seat not the hp
I don't know if the torq #s are the same on the roller and non roller or not all i can say i could tell a difference with the roller engine over the non roller one. Maybe it just revs up quicker i don't know but i could tell a difference and it sold me on it and if i get another one i would go roller.

If your are wondering if a 86 or newer duke engine will fit in the 84 and 85's, it will. I just finished doing a swap like that. I had a 85 SE with a bad head and a 5sp tranny and put a good 87 4cyl with a auto tranny into it. The newer one has tons of improvements and I found to be more efficent, plus it eleminates the distributor. The newer engine harness will plug into the older body harness. Only minor different things to compensate for like the fuel lines are in a different location, coolant lines for heater core hook up differently, and I had to change the throttle cable, but otherwise it was a easy swap.

My Duke isn't doing so well. I've been calling around this morning asking about an 86 Duke to drop into my Fiero and haven't had much luck. On the way back from a visit to the Grandparents' I did stop at the shop where I get my state inspections done and he has an 84 Duke sitting in his shed actually. Got the car at an estate auction two months ago. I personally knew the old woman who owned it and passed away. The Olds it was in only showed 39K miles on it but who really knows. He's asking $200 for the engine and it might end up being the one I'll have to use.

quote Originally posted by binarycode: My Duke isn't doing so well. I've been calling around this morning asking about an 86 Duke to drop into my Fiero and haven't had much luck. On the way back from a visit to the Grandparents' I did stop at the shop where I get my state inspections done and he has an 84 Duke sitting in his shed actually. Got the car at an estate auction two months ago. I personally knew the old woman who owned it and passed away. The Olds it was in only showed 39K miles on it but who really knows. He's asking $200 for the engine and it might end up being the one I'll have to use.

waht year is the duke you have know?

quote Originally posted by binarycode: My Duke isn't doing so well. I've been calling around this morning asking about an 86 Duke to drop into my Fiero and haven't had much luck. On the way back from a visit to the Grandparents' I did stop at the shop where I get my state inspections done and he has an 84 Duke sitting in his shed actually. Got the car at an estate auction two months ago. I personally knew the old woman who owned it and passed away. The Olds it was in only showed 39K miles on it but who really knows. He's asking $200 for the engine and it might end up being the one I'll have to use.

Have you tried car-part.com? I found a few in Pennsylvania:
1986
Engine
Pontiac Fiero 3-86 2.5 CNR ACC TOW IN SHOULD BE OK 230486 $300 Thruway Enterprises, Inc. USA-PA(Parryville) E-mail 1-610-377-0331

1986
Engine
Pontiac Fiero 2.5 5 SPD RAN GOOD 125 COMP BKG S-N 990607 $Call Thruway Enterprises, Inc. USA-PA(Parryville) E-mail 1-610-377-0331

1986
Engine
Pontiac Fiero FWD,FI,2.5,MT NF0417 $Call Patterson Auto Wrecking, Inc. USA-PA(Cochranton)

1986
Engine
Pontiac Fiero 2.5 RUN GD KEY START REMOV 606 C 606 GO5649 $Call New Castle Auto Wrecking, Inc. USA-PA(New-Castle) E-mail 1-800-245-2226

That's the first place I checked. Nothing local to me however. I don't have the means to exactly go pick up an engine myself. I don't even have the space to store it, let alone to put it in even if I did have that ability.

Off the topic though, car-parts.com did show a local garage with nealry 8 3800's for under $250. I imagine they've been stripped of all accessories. I know the people who work there They know me too, that's probably why they won't return my emails or phone calls! HAHAHA. Something about dumping the owner's daughter two months before the Junior Prom angers him quite a bit. *shrug*

quote Originally posted by boysatt: If your are wondering if a 86 or newer duke engine will fit in the 84 and 85's, it will. I just finished doing a swap like that. I had a 85 SE with a bad head and a 5sp tranny and put a good 87 4cyl with a auto tranny into it. The newer one has tons of improvements and I found to be more efficent, plus it eleminates the distributor. The newer engine harness will plug into the older body harness. Only minor different things to compensate for like the fuel lines are in a different location, coolant lines for heater core hook up differently, and I had to change the throttle cable, but otherwise it was a easy swap.

Ours are 84s and they have different wiring harness setups which makes things nearly impossible if you have to change computers. I imagine you would have to do that on a DIS engine, right?

quote Originally posted by MODIFIE: waht year is the duke you have know?

1984 vin code R