lightened flywheel

[rx191]

does anyone know of a companmy making lightened flywheels for an 91 3.1 i think it is an internall balence engine if i rember right.

[SHOoff]

I dont know of any companies that make a flywheel that specifically says 3.1. BUT, the 3.1 uses the same flywheel as the 2.2. So you can use an aluminum flywheel for a 2.2. They even have one at autozone, strangely enough.

[birdman]

is it the same for the 3.4?

[sharkey]

i know fidenza makes flywheels for fwd motors. however i dont know if them make a rwd version. im not sure if there is a difference or not

[birdman]

whats RWD have to so with this?

[sharkey]

rx191 has been talking about the 3.1l ironhead motor from a camaro that he is putting into an mg (i think it was an mg) so i can only assume that he is talking about the same project.

[birdman]

i didnt know camaros had 3.1's i thought they came with 3.4's and 3.8's. my bad. but they were talking about a 2.2 and i know they didnt come with that.

[sharkey]

camaros came with 2.8l from 80-89, 3.1l 90-92, and 3.4l 93-95. they also came with 3.8l i beleive 96+, and some years in the 80s they even came with the 2.5l iron duke.

they were talking about a 3.1 and 2.2 using the same flywheel. now i dont think they are the same flywheel, but they can be interchanged without problems.

[SHOoff]

camaros came with 2.8l from 80-89, 3.1l 90-92, and 3.4l 93-95. they also came with 3.8l i beleive 96+, and some years in the 80s they even came with the 2.5l iron duke.

they were talking about a 3.1 and 2.2 using the same flywheel. now i dont think they are the same flywheel, but they can be interchanged without problems.

Oh... well, this is why we need to clairfy WHAT we're posting about. That would have helped narrow it down a lot. For FWD, the 2.2 and 3.1 have the same PN for the flywheel (at least at AutoZone they do)

For RWD, they are different. The 2.2 S-10's also look like they use the FWD flywheel.

[rx191]

i'm building a lotus super 7 replica with a spare 3.1 i have. the car will only weight 1200 pounds when complete so the trouqe from a heavy flywheel is not needed i want the thing to rev very fast, i'm going to check into weither a 2.2 flywheel will fit my rwd 3.1 i don't see why not i think the front wheel drive v6 use the same flex plate so why not the same flywheel, i check it out and keep u guys posted

[rx191]

i found that frindza (sp?) makes a lightened flywheel for the 3.1 rwd and the gen 1-2 fwd cars it's even on there web site as 2.2/3.1 and they show a flywheel for older 2.8s also they all weight 8 pounds and run about 350 bucks. that should make one of these engine very fast reving

[RebelGT]

i found that frindza (sp?) makes a lightened flywheel for the 3.1 rwd and the gen 1-2 fwd cars it's even on there web site as 2.2/3.1 and they show a flywheel for older 2.8s also they all weight 8 pounds and run about 350 bucks. that should make one of these engine very fast reving

I'm building the same type car as you, except I'm using the dohc engine. The flywheel will bolt up, but RWD engines are eternally balanced as far as I know. There's no counter weight on FWD flywheels, like there are on the RWD flywheels.

Here's a pic of my Fidanza flywheel showing no counter weight.






here's an externally balanced flywheel.

http://60degreev6.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=796&g2_serialNumber=2

I could be wrong, so double check, but I'm pretty sure thats the situation you're in. If I were you, and being that you want a quick reving engine, get a 3400 FWD engine, it'll be more what you're looking for.

[geoffinbc]

Dude None of our engines have been external balance since 88.

[Guest]

Dude None of our engines have been external balance since 88.

QFT!

Also I've posted this same info here countless times, and yet no one seems to remember it.

The FWD and RWD Flexplates/flyhwheels are different diameters. The RWD is IIRC 1/2" larger in diameter than the FWD counterpart. It's between 1/2" and 5/8" anyway.
I do not know about the RWD 2.2 flywheel/flexplate however. I do see how it would most likely be the FWD variant, due to the FWD starter placement.

I do not know of any off the shelf lightened flywheels for the RWD.

You may be able to adapt use a FWD version, but starter engagment will need to be verified before you try and run it with the combination of parts. Might be a gear change or something like that to solve all issues.

[RacerX11]

FWD flywheels measure 12", 142 teeth. The RWD flywheel I have from an '85 2.8L S-10 measures 12-1/2", 148 teeth.

Marty