Twin throttle bodies

[wraith]

That works on FI engines. where the plenum is pressurized.
Trick with an NA engine is to keep the airspeed up into each runner. Basically make it easier for the engine to get the air. Otherwise intake manifolds would be just a big square box on top of the motor.

Not trying to start anything but is that possibly a reason people think the old buick is more tourquier? As it doesn't have a big plenum to fill?

 

[soop]

I know whats involved in designing one. I've been studying it for a couple of months now. (Not saying I know it all, but i've a small understanding of the principles needed)
And from what I understand, I would be increasing the length of the intake runners, and improving the shape of the runner port, to improve the flow from the plenum to the runner.

The plenum displacement only needs to be about 1/3 of the over all engine displacement. Any more then that and its not really going to help anything.

EDIT:
You don't need to "Fill" the plenum.
The torque is probably more down to head design and tune.

I think that the Ecotec v6 has a far better intake manifold design then the Buick.

 

[chevy_big_block_bro]

There's a difference in the runner length between the S1 VN and the S2 VN - VR buick motors. The S2 is an inch longer
The S2 also got the bellmouth in the intake to help distribute air evenly that apparently took a little of the seat of the pants torque away.
The S1 VN got a slightly lumpier cam and a more aggressive tune

 

[soop]

Very basically, longer runners promote torque while short runners promote Horse power.
Short runners are good for FI or high reving motors.

There is too much difference between S1 Buicks and S2 to draw a real comparison with the intake manifolds.
But comparing the manifolds alone I would go with the S2 manifold. The fact they used a plastic insert to rectify a problem with the back two cylinders leaning out says its a fairly poor design to start with.

 

[chevy_big_block_bro]

I know whats involved in designing one. I've been studying it for a couple of months now. (Not saying I know it all, but i've a small understanding of the principles needed)
And from what I understand, I would be increasing the length of the intake runners, and improving the shape of the runner port, to improve the flow from the plenum to the runner.

The plenum displacement only needs to be about 1/3 of the over all engine displacement. Any more then that and its not really going to help anything.

EDIT:
You don't need to "Fill" the plenum.
The torque is probably more down to head design and tune.

I think that the Ecotec v6 has a far better intake manifold design then the Buick.

The yanks have a banana type intake similar to the LSX intakes that they put on their series 3 motor which im pretty sure is the same as the ecotec. Its been a while since I've had a V6 so I cant really remember the particulars. I wanted one but couldn't find the lower section anywhere for sale.

Wow we've gone off track here lol

 

[soop]

You can see how long those runners are can't you, in comparison to a VN buick manifold.

Buick and Ecotec manifolds are different and arent interchangeable with one another. The OP has a a Buick motor, so that manifold isn't much use to him.

 

[chevy_big_block_bro]

Yea I know lol
Getting a little off track.

Anyway did the OP end up installing the twin TB setup? Would only take 5 mins and there's no MAF to plump up so no worries there with a little PVC pipe and pods

 

[soop]

Looks like he did in the second pic in the 1st post.

 

[swiftymcfeat]

I get it on friday or monday... Ill keep you updated

 

[chevy_big_block_bro]

No worries

Yea the second pic looked like a for sale pic