http://www.actionspeedparts.com/eagcra1.html

$209

its an Eagle Crank.

Now if only i could find a Cast or Forged Steel 3.1/3.4 crank...

 

Nice find, it's kinda funny that the only V6 listed there is a 2.8.

 

yeah, someone should make a sticky with a bunch of performance parts that will work on our engines complete with links and stuff like that.

 

Super Sport 981 Performance Nodular Forged Steel, Iron Cast, (Supports 350+HP, sustains high RPM, Melonite treated) $715

2.8/3.1/fwd

 

Didn't I read somewhere that the 2.8 factory cranks were forged? Or was that some other v6?

 

http://users.spec.net/home/emxjc/crank.html

"All production V6/60 crankshafts are cast nodular iron. Several types were made due to changes and improvements that occured during the lifespan of the 60deg engine."

thats the info i am going off of, because i havent seen anything to prove otherwise.

And i think Cast Steel would still be better than Forged Iron...

 

Not to redirect the thread but:

It is the rods that are forged steel, part of the reason why GM will say that peened rods will survive well at 7000 RPM.

 

So steel isn't iron? I always thought the two terms were interchangable...?

 

From what I understand, steel is a stronger form of metal made from iron. Iron is softer of the two. Also the differences of how it was cast, forged, etc , make a difference. *shrug* Just my little bit of knowledge on it.


-Dan

 

steel is purified iron. I found this simple description:



Making steel is a process of reducing the following impurities in pig iron,

- manganese
- silicon
- carbon
- phosphorous
- sulphur
- etc


· This operation is commonly done in one of three furnaces,

- open hearth - flames are directly applied to the metal, and can be seen from the open hearth.
- electric
- basic oxygen - a blast of pure oxygen reacts with impurities


· The basic procedures with all of these furnaces is,

1. Charge (pour in) scrap iron
2. Pour in molten (pig) iron
3. Add lime
4. Run the furnace
5. Tap the furnace to remove the steel - care must be used not to pour the slag on the surface
6. Pour off the slag off


· Any oxygen left in the steel when solidified will combined with carbon. The result is small voids that are actually pockets of carbon monoxide gas. A killed steel will have all oxygen removed.

 

Cool; thanks for the info!

 

the turbo grand prix's were supposed to use a hardened and rolled crankshaft.

 

It still has yet to be determined that the TGP/STE used a crank that was actually any different than the N/A crank. If someone was willing to actually have one tested for the hardening properties it would help determine this, but that seems to be the only possible difference, everythig else when compared visually, looks IDENTICAL, the rolled fillets, dimentions, even the casting number are the same, both 981 casting numbers.

 

link? or part number.

i cant find it anywhere.

 

Shady, I thought carbon was added to steel to improve strength. The % carbon in steel is indicated in its grade number, for instance 4130 steel contains 30% carbon. Sad to say I am a mechanical engineer but last studied steel materials about 5 years ago, so this info has gradually seeped from my pourous memory.