Has anyone adjusted their intake runner length to match a new cam, or just wanted to tweak the power curve for their particular application? The stock 06 Z06 length measures 13", 7.5 for runner and 5.5 in head. That's 5,788 RPM. OK, so it's also designed for street.

But I do HPDEs and with my cam it drops to 5,379 RPM. So hmmm take an inch off? What do you think? What's the length of the C5R's or C6R's? Bet that's hard to find out.

 

Huh? What the hell are you asking!?

If you want a different length runner, you don't adjust anything. You install a different type of intake manifold. You've got only a couple of options, both of which are expensive. You can put on a single plane carb type intake, or go custom sheetmetal.

These RPMs you're calculating? What do they represent? HP peak? Torque peak? If either is the case, you're way off base. Using old tech runner length math to determine HP and torque peaks on the LS1 doesn't work like a SBC/BBC does.

You do "HDPEs". If that's what I think it means, you're certainly not going to be able to design an intake that works right on the first shot. You do know that companies like Wilson/Comp Cams have spent millions developing intakes for the LS1, utilizing the best minds in the business? You think you can better that?

 

Ahahahahahhaha.

I don't know what you're trying to figure out, but the LS7 motor can see upwards of 7500+ rpm on its intake manifold.

The LS6 intake can support upwards of 430-450rwhp NA.

The FAST 90/90 can support 550+ rwhp NA.

That's really all you need to know.

 

The purpose here is FUN. It is a HOBBY.

These manifolds are easy to cut up. I hope someone can speak from experience. The 1/4 wave effect gives peak pressure at resonance, less some other reflected waves interractions. Sure you can get alot of CFM, but why not optimize it where you want it? Clearly these come out of the box tuned for the street, so there is room left for specific applications ie optimizing cylinder filling at higher RM ranges. Why not learn something?

 

I kind of smell what you're stepping in..

not exactly sure of the FAST 90/90 length/volume, but it's supposed to scream with a h/c over the LS6 intake.. Nice mid range from what I gather.

 

The only experience you're going to find in this area is going to be from a very select few that have actually developed an LS1 intake. They are making a profit off of their findings, and you won't find them giving away their hard earned R&D.

What exactly are you trying to do? Explain what you want so I can recommend an intake that suits your needs that ALREADY EXISTS.

Do you design intake manifolds for a living, or do you just work with plastics?

 

theresnly one way to find out, go dyno, then cut it up, redyno and let us know how it turned out

 

I don't think anyone in their right mind would take on a re-engineering project like that... afterall, GM probably spent tens of thousands if not hundreds of thousands designing the LSx stuff back in the mid 90s.

Maybe you could engineer something this nice:



or maybe even this:

 

wouldnt that kinda be like porting stock heads, yeah, who would ever think of doin that......

to the OP, what your trying to do is prolly going to take way to much time and effort

 

He's not talking about porting a stock intake, but rather completely reengineering a current design. So it would be more like sticking on some DOHC Arao heads to alleviate the high RPM breathing problems a stock LS1 head has. We all know how well that turned out

The whole problem is that kelp is trying to accomplish something that has already been accomplished. Others, who have decades of proven capabilities in intake design, have found the avenue he wants to take doesn't work. You can't just take a stock LS7 intake manifold, cut it up, remove 1" from the intake runners, and expect to be able to bolt it on and make it work for so many different reasons.

 

Not even close.

 

Those pictures make me sick. What kind of **** tard would put that on their vehicle?

 

My goal is to obtain information. Anyone have any?

For example: The FAST (LSX) Intake Manifold has "Runners can be match ported and include witness grooves to indicate how much material you can remove."

 

Yes, you can portmatch the FAST 90/90 to the heads.

 

The FAST intake is a 3 piece design that allows you access to the entire intake system, negating the need to cut it open. You can port the throttle body inlet, the entire length of the runners, and finally port match the intake runners to the head runners. You cannot however, "adjust" the runner length.