V6 Help!

[tha_SwEdE]

I was wondering if the 350 rods that can be fitted in a V6, is a good choise for turbo chargin?? How mutch HP can they take??

And were I can get hold of:

Cylinder heads for turbo usage
A camshaft for turbo
Pistons for turbo (92mm same as the 3.4L)
High vol. Oilpump
Timing Chain for turbo
And cam rollers for turbo

It's going to be fitted in a 3.0L with twinturbo.

And a last thing... how mutch HP do you think I can get from a twinturbo 3.0L 60* V6????

Have a nice day...///Bjorkman.. =)

[bszopi]

RE: V6 Help!

What engine are you starting with? Kinda need to know so we can lead you in the right direction.

[geoffinbc]

Use all stock components except maybe the pistons. You will be good up to about 400HP.

[Doubt_Incarnate]

3.0? sounds like a bowtie block or something. maybe a dangerously bored 2.8L. as far as 350 (early "small journal") rods, they require modification to fit correctly, so its up to you which ones to start with. steel, iron, aluminum, blah blah...

[z284pwr]

3.0? sounds like a bowtie block or something. maybe a dangerously bored 2.8L. as far as 350 (early "small journal") rods, they require modification to fit correctly, so its up to you which ones to start with. steel, iron, aluminum, blah blah...

What he said....

Wrist pin isn't the same size, have to use oversized bearings and have to shave the rod/rod caps slightly on one side if I remember correctly?

[Guest]

I would say that since he will be using 92mm pistons which is stated "(Same as 3.4)" that he is starting with a 3.4 block, which there are 3 choices of, one of which is eliminated due to the forum this was posted in. So that leaves the 3.4 from the F-body or a 3400. either way, the block itself is not important but a good bit of info to have.
He's using a 2.8 crank.

He's actually doing what I have been planning out for a while, I still can't decide on the Short stroke 3.1L (With the bore) or a 3.5L, the longer stroke creates more torque, torque x RPM = HP....Hmmmmmm

Anyway. I have been using the stock 1986 rods in my turbo hybrid, and have not had a problem for 20000 KMs.
I also just pulled the heads tonight and other than some to me excessive carbon build up, everything looks great.

Asking how much HP you could get from a theoretical engine without all the info (even with it all) is a real crap shoot, there are so many variables to take into account that best guess would put the estimate at between 150HP and 1500HP.

[tha_SwEdE]

RE: V6 Help!

I got a 2.8L and want to get more L.
with turbo..
...doesn't the 2,8L handle 92mm with turbo??

Is there any 350 with longer rods that handels over 400HP????

[Juglenaut]

RE: V6 Help!

2.8L overbored to 3.4L seems alittle risky, like BOOM.

[Doubt_Incarnate]

2.8 could barley handle 92mm as is, add a turbo and id guess the cylinders would experiance the "m-80 in a pop can" kind of failure.

as far as 350 rods, im sure any aftermarket thing will do 400hp, wasnt the LT4 400hp? longer rods would require special pistons, or if using the 2.8 crank, you might get away with the 3.1 pistons in the 2.8 block. most longer rods are .3" bigger, and the difference in stroke is .32". done properly, bored 1mm, the rwd 3.1 pistons will produce something like 11:1cr not good for boost, and i think a stock fwd 3.1/3100 piston ends up dangerously close to the heads. like .036" out of the cylinder. all this is just spur of the moment idiot math, good chance im wrong, equaly good chance im right.

[Guest]

Gen III pistons are speced to come prud of the deck surface by .020", I've measered up to .022" so far.

If you put 3.1 pistons in with a 2.8 crank the piston will be down in the bore and have evry low SCR, probably to the point it wouldn't run. Now if you are also saying to use longer rods, with that combo, DON'T! The Rod ratio is near perfect at 1.906, going with a longer rod to compensate, say a 6" rod, woud make for a 2.006 ratio, which most builders will agree is far too high. The 3.1 from the factory has a poor rod ratio of 1.72, which some will say is decent. I feel that part of teh reason the 2.8 works so well is the 1.9 rod ratio.

[tha_SwEdE]

RE: V6 Help!

So if I get 3.1L pistons and have the same lenght on the rods as in a normal 2.8L that would work with a turbo??

What volume will that give me?? 2.9L??

Or should I just stick to 2.8L for my twin turbo use??

Where do I find forged pistons for this??
And can some one say were I can get hold of cylinderheads in Alu, that works with turbo??
And a turbo Camshaft??

thx for all the answers...

[bszopi]

RE: V6 Help!

The only aluminum heads for these engines are stock GM. There are some places that will port them out, but the majority of them charge way too much, so it'd be easier to just do yourself.

You can pick up a set of forged pistons from Ross Racing for ~$600.

[tha_SwEdE]

RE: V6 Help!

What do ported heads cost??
Are they really that expensive??

[bszopi]

RE: V6 Help!

They can range from $600 to $1300.

[Guest]

Re: RE: V6 Help!

So if I get 3.1L pistons and have the same lenght on the rods as in a normal 2.8L that would work with a turbo??

What volume will that give me?? 2.9L??

Or should I just stick to 2.8L for my twin turbo use??

Where do I find forged pistons for this??
And can some one say were I can get hold of cylinderheads in Alu, that works with turbo??
And a turbo Camshaft??

thx for all the answers...

You really need to read about engine theory, it's quite eveident that you don't have much experiance with engine builds.....

To use a 3.1 piston on a 2.8 crank, the piston will be so far down in the bore, the engine probably wouldn't run.

Honestly, I'd probably just go with a .020" or .030" over bore (minimum to clean the cylinders) and be good to go, keeping a 2.8 (or a 2.9 with a .030" over), and have lots of fun.

You can use genII or III heads with a turbo, I'm running some '95 3100 heads (and intake) on my truck now (technically I've already removed them for the '00+ intake/head swap), worked great when it was together, and would have continued that way, I just want mo' powa.

You can get Forged pistons from Sealed Power, for the 2.8, but wll only be good for iron head, especially when a turbo is in the mix, unless you want to spend lots on tuning and high octane fuel.
Ross Racing also makes Forged Pistons, Wiseco, etc, all cutom to your specs.