Fiero rally car build, Part II

[Chase Race]

I never asked this before, but is a 2.8l, even built like the one you have, powerful enough to compete?

I'd expect some serious competition out there, and I wouldn't think 140whp would be enough to go anywhere.

140 whp would be plenty. Here's how the engine rules work for rally. My class (Group 2) has an adjusted displacement limit of 2400cc. To get adjusted displacement you take the actual displacement and multiply by:

1.0 for 2 valves/cyl
1.1 for 3 valves/cyl
1.2 for 4 valves/cyl
0.8 for pushrods

That means that a 4 valve 4 cyl is limited to 2000cc while I'm limited to 3000cc.

With all that said, though, it doesn't matter. If I had it to do over again I would keep a stock motor and dump the same amount of money into the suspension instead. I believe this would make a faster car.

[Aaron]

Well I know of a stock motor you could buy, it'll probably look pretty familiar too :salute:

That's pretty interesting, those requirements. Are power adders allowed, like a turbocharger?

[Chase Race]

Are power adders allowed, like a turbocharger?

Forced induction is not allowed in Group 2. Neither are rotaries. Both go into Group 5, which is the large engine 2 wheel drive class.

[Aaron]

Are power adders allowed, like a turbocharger?

Forced induction is not allowed in Group 2. Neither are rotaries. Both go into Group 5, which is the large engine 2 wheel drive class.

Ahh I see. I bet you could hide a little nitrous though...

But from the sounds of it the power isn't as essential, same thing with autocross. That is my fault in FSAE amd autocross, all I care about is the going fast :scratch:

[Kohburn]

doesn't take a lot of power to go fast, just gets you up to speed quicker ..

the key with turns is to cary your speed through every turn

[The Dark Side of Will]

140 whp would be plenty. Here's how the engine rules work for rally. My class (Group 2) has an adjusted displacement limit of 2400cc. To get adjusted displacement you take the actual displacement and multiply by:

1.0 for 2 valves/cyl
1.1 for 3 valves/cyl
1.2 for 4 valves/cyl
0.8 for pushrods

That means that a 4 valve 4 cyl is limited to 2000cc while I'm limited to 3000cc.

Chuckle... 0.8 for pushrods.
Is displacement the only rule for engines? IE, engine doesn't have to be from same application or model year as car? Same MFG?

92 bore x 76 stroke V6 (3.4 block with 2.8 crank) topped with Gen III heads and intake would be a mean combo. Prolly get 180 WHP with the right cam/headers.
Of course that comes out to 3031 cc's, so you'd have to find some way to run a 91.5 mm bore...

[Chase Race]

IE, engine doesn't have to be from same application or model year as car? Same MFG?

"The engine is unrestricted; with the following exceptions: no rotaries are allowed, no forced induction; must be derived (at least the engine block) from a product line offered by the manufacturer of the vehicle."

Pretty free, eh?

[Aaron]

Chuckle... 0.8 for pushrods.
Is displacement the only rule for engines? IE, engine doesn't have to be from same application or model year as car? Same MFG?

92 bore x 76 stroke V6 (3.4 block with Boat Anchor crank) topped with Gen III heads and intake would be a mean combo. Prolly get 180 WHP with the right cam/headers.
Of course that comes out to 3031 cc's, so you'd have to find some way to run a 91.5 mm bore...

I'd use a 2.8 aluminum block, 3400 heads, and a 3500 intake manifold (If I didn't go custom). This, with a good set of headers and a nice high RPM cam could easily be capable of 200+ whp IMHO.

[Kohburn]

i'd run a 3100 and destroke it with a 2.8 crank -bore it out to bring the displacement as close to 3000 as possible - drill extra holes in the oil channel of the bearings as described in the pontiac performance engine build instructions for improved crank oiling..

it should be able to rev like mad then

[eHoward]

SOMEBODY GET DOUG AN ALUMINUM 60 DEGREE!

IE, engine doesn't have to be from same application or model year as car? Same MFG?

"The engine is unrestricted; with the following exceptions: no rotaries are allowed, no forced induction; must be derived (at least the engine block) from a product line offered by the manufacturer of the vehicle."

Pretty free, eh?

[Aaron]

SOMEBODY GET DOUG AN ALUMINUM 60 DEGREE!

With aluminum 3400 heads and a 3500 intake manifold!

[Shaun41178(2)]

or a ITB intake manifold instead of the 3500.

[The Dark Side of Will]

Aren't the 3900 heads better yet?

[Aaron]

or a ITB intake manifold instead of the 3500.

Sounds familiar, and very expensive :thumbleft:

[Shaun41178(2)]

Aren't the 3900 heads better yet?

I am not even sure if they will bolt up to a non 3900 block or not.

Chamber placement might be different for the larger bore. Not even suer about the bolt locations. Noone has taken one apart yet that I know of

[The Dark Side of Will]

Moved to Motorsports at request of author.

[I_wear_pants]

Any updates?

[Aaron]

I warned you this would be slow.

I doubt there's much progress taking this into account, but I look forward to the updates!

[Chase Race]

Any updates?

Nope. Sorry. Work calls...

[fieromadman]

I read this for the first time today, always been a fan of what you do, and the competition that you brave. 'Nuff of the brown nose, I got some info for ya on who owns Oriefs engine. It's Ditch on Old Europe. He doesnt even like it that much to be honest. He's looing at either doing the 3.4 TDC or the 3800 S/C now. I forgot his real name, but he seems like a nice guy, maybe you can convince him to dyno it on a chasis dyno.