Nah nah nah...I don't think you can work with the stock intake manifold it's just going to be a problem regardless of porting or chopping or whatever.

My grand idea would be to use something like the hahn intake manifold (turbo), mounting a centrifugal supercharger somehow and route it through a liquid cooled a/a intercooler then into the manifold. The turbo "lite" "more money than it's worth" conversion. It's not positive displacement but it would be somewhat more efficient.

Either that or just chop the cores altogether (on the inside) then weld in some sort of coolant cavity and pray it doesn't leak sucking coolant into the chambers. Sort of like the supercooler design.

 

This is the basic layout of how my design works. Dont mind the paint.... Basicly the air enters from the supercharger and is extremely hot then it passes threw the upper portion of the dual pass 10 pass core. Then the front cover redirects the lukewarm air back threw the second pass of the core and the air becomes extremely cool. Lastly the air makes it's way to the cylinder head where I'll be directly injecting Methonol!

Here is a rough image! DOUBLE CLICK TO SUPERSIZE!!!

 

^host it here please? photohosting sites are blocked on this computer.

 

read thread...
https://www.cobaltss.net/forums/advanced-performance-modifications-130/lower-intake-port-polish-project-123065/

 

I don't mean to sound like I'm knocking your project, cause I'm up for innovation.... however I have two concerns.
1) That the IC may not be properly sized for the task of cooling our blast furnace intake air. I have a gut feeling that it should work... but just want to check that you want though the paces of sizing one to fit the car.
2) That your 'turn-around' is a bit too sharp. That is one of the basic flaws of the OEM piece. The inatake charge must pass though the steeply placed flow directors, which raises resitsance. My suggestion for you, is to have the charge feed though the core in one pass, and make a longer, more fluid return back to the outlet.

Just my 2c's

 

we all know about that man, but we are talking of a newly fabricated manifold, not just a modified stocker.

 

I talked about it a little at the begining but basicly that core is rated to 750whp. It has 10 times as much stay time and surface area then the standard luminova design. Think about it the luminova fins are twice as spread apart as the core I had made at bell intercoolers and the flow threw the fins is only a 16th of an inch tall. Not to mention that the demensions of the core are 6 1/2 left/right by 4 1/2 top/bottom by 3 1/2 thick the 3 1/2 thick portion is where the are flow goes threw. The surface area is 191.85 cubic inches!!!!!!!!!! the luminova surface area is 24 cubic inches! You do the math. By the way this isn't my first engineering project. I've built an intake manifolds for turbo 240sx that made 280whp and 270ftlb at only six pounds of boost which distroyed the tranny. The car will easly make 500whp at 18 pounds of boost just waiting on fuel rail for the completion! I've also been doing a large amount of port work for alot of people. I understand flow!!!! the choke point you mentioned when the air exits the first pass and enters the second pass is still a huge huge huge decrease in the choke point in the stock manifold as the compressed air waited to pass threw the luminova's! There are four slots in a wall from top to bottom. The opening on the slots where only 5cm's high by 4" wide. These slots are the openings to the luminova's they also exit on the back side threw the same sized slots??? Talk about generating some gobbs of extreme heat!!!! This is why the stock cobalt or any M62 cobalt for that matter make great 60ft times in the quarter mile then at the last part of the quarter mile the engine loses all power due to excessive parissitic loss, hummm??? thats cause of the massive choke point thats no longer cooling ****! My design takes all of GM's flaws out of the equation resulting in actual cooling during long periods of wide open throttle. Prouf if in the numbers. Once I take to the dyno to get tuned. I'll input all crucial data! The car will need extensive tunning due to all of the new Cold Dense air entering the combustion chamber. She'll need more fuel I'm betting I'll max out the 60lb injectors! Like I said earlier It'll now be a useable 800CFM of compressed air instead of hot fuel with BOOST. The idea is to run less boost with the same sized pulley thats how you make power. Efficency????

Great so he ported and polished the same little wall blocking the outlet of the supercharger creating the most unefficient hot unusable air ever. Lets face it GM doesn't care about performance from the SS just there flagship cars!!!!!

On that pic Look at the top portion of the manifold opening you'll see one of the little slit/openings I'm talking about!

Along with that one there are four more on the openings of the luminova's!

 

Oh really???? What do you think of that Omega? lol

I don't want to start a bashing war but I have one question for you STS2/SS. Do you use paint to design all your intakes?

 

dude.. that ***** fucked up...

 

whats omega?

and who cares what someone draws out an explination on, ms paint or corel draw it gets the point across.

 

I think that's an incorrect measurement.
Last I checked it was something like a 14mm opening, that are the width of the IM. The openings are flow directors, to keep the charge against the core.
Indeed, they are too small for big power, but have much greater potential if they are used in a different design. The number one error with the IM is not the cores... but the flow path that the charge must take. That is a key thing to remember when designing an IM... how smooth the air flows.

I'm Omega

 

o ok ha ha ha

 

Ok I'm so sorry it's 9/16 inch. Big f-en diffrence. The botton line is when I'm beating your asses with my M62, then you'll listen I'm sure! And who are you any way I've been doing this **** for ten years something your going to teach me about redesigning a horrible designed intake manifold???? I don't think so.

As far as the ms paint I didn't CAD the design cause I'm just having fun... There where just a few guys uncleare about the flow path, what do you think of that freakta, ha, ha, ha!

See the bottom right picture on my signiture, thats what happend to the last idiots that talked ****! This is a 9 second grand prix GTP engine with just an eaton M90 as the power adder. It's called skill boy!!

See the bottom right picture on my signiture, thats what happend to the last idiot that talked ****! This is a 9 second grand prix GTP engine with just an eaton M90 as the power adder. It's called skill boy!!

 

*Here we go again*

...this oughta be good....

 

As far as beating asses... you should do a search for my projects... you might find some useful info in a few of my posts in similar threads.
I'm not going to spout credentials or plans publicly... there are enough people interested in my work as it is.

 

Why did you ever take your post off of the tech for porting manifold? That was a sweet post! I looked at your pictures again and it was clear that the stock IM sucks. You have to agree!

 

Too many whiny bitches on CSS.
I don't need PM's in my inbox asking "how much HP gain?". ****... I'm not going to spend $200 on two dyno sessions to prove a 'free mod'.

 

actually he just did that cause I was asking how the air would flow through it. But thanks for your phenomenal input in this thread.

 

I think arguing over a forum is lame so I and I am not going to get pulled in.

Sorry but when people start swearing in a reply i didn't think it was neccessary to reply but I do have some facts to add to the value of this thread.

STS2/SS first said the ports were 5cm tall. The Laminova core is not even 4cm tall. Its 39.5mm actually. Then he said the the port was 5 inches long. Close but it closer to 7 inches.

Sorry but I got a kick out of STS2's attitude toward Omega. Omega has been working on improving the LSJ manifold for a long time and STS2 didn't have a clue what he was talking about.

If you are going to throw out numbers as facts make sure they are right.

Beerman, do you have anything to add to this thread other then...
and

Here is the inside of an LSJ intake manifold since you have never seen one.


Back side stock.


Back side ported.


Front side ported.


Top side ported.


Welds




Those are pics of the ported IM that is sitting in my garage right now. Is there anything else I can help answer for you?

 

I'm very curious to see the results of any new manifold design. Even if it fails, it's a great step because it's progress either way: a way that doesn't work or one that's better.

 

No, I'm here learning and asking questions. Thats what these forums are for. Not for the typical css.net whining, flaming, and infantile fighting. Is there a problem with that? If so too bad get over yourself and you seemingly endless supply of knowledge.

 

so ebristol what did you get for gains out of your port job on the intake manifold

 

No info yet. I need to get my original tune cleaned up so I can get a baseline.

 

you did a really good job welding it up id like to know what you got for power out of that thing

 

Oh I didn't do it myself. See sig! lol

Original Thread
https://www.cobaltss.net/forums/2-0l-lsj-performance-tech-47/ported-lower-intake-130152/