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Intake manifolds

Posted: Thu Feb 07, 2019 5:42 pm
by jacoblindsay
Im looking to make an intake manifold that uses the same principles as the magnum intake that will fit right onto an 02 2.0 sohc Neon. I would take my intake of and do what I need to do with it but its is my daily and I don't have any days that I can just sit down and do what I need. Soo I'm coming to all of you to see if anyone has their intake manifold for a 2.0 sohc off and is willing to make a sketch/ diagram of the mounting hole positions, outlets holes, and size/shape of the flange. And also maybe some clear dimensions of the size of the whole intake. I would just use a gasket like I normally would but of course each outlet has a gasket so its not much help. Thanks for your help in this. :D

Re: Intake manifolds

Posted: Fri Feb 08, 2019 1:19 pm
by JeremyJ
Why not just switch to a Magnum intake instead of making a duplicate version of it? They can be ported and smoothed out for better flow.

Re: Intake manifolds

Posted: Fri Feb 08, 2019 3:32 pm
by jacoblindsay
I've thought about it but they are hard to find for a good price and I want to play around with my CAD software and 3d printer and see if I can't make something capable of the duties of an intake. I'm an engineering student too so I like making things difficult. If no one is able to get me a diagram I'll go to the junk yard and pull one that I can hack up and all.

Re: Intake manifolds

Posted: Fri Feb 08, 2019 11:56 pm
by BlackRoseRacing
Your best bet is to get a cheap junkyard manifold to work with. This way you have the exact numbers you need and is something is incorrect you can always go back to the manifold you currently have to double check things.....
Here's a link to an older post I found doing a manifold shoot out, maybe this will help you with your designs.....

Re: Intake manifolds

Posted: Sat Feb 09, 2019 4:16 am
by jacoblindsay
Awesome thank you I will refer to this often now. I'd love to do ITBs but I am a sucker for a CAI and I have an out of the box idea for that as well.

Re: Intake manifolds

Posted: Sat Feb 09, 2019 10:56 pm
by occasional demons
I doubt anyone has the specs you would be looking for, your best bet is going to a JY and getting an IM.

The Magnum IM is also pretty heavy relative to the plastic and 1gn aluminum DOHC IM's, due to the butterflies and larger size. I have often wondered how much the weight of it takes away from the added performance. I honestly don't know why they didn't mold it out of plastic. It is lighter, and has less thermal conductivity.

I have one that I haven't installed, because I am pretty happy with the Ghetto Blaster IM I made from a 1gn IM. It has a large inlet, so there is no bottleneck after the throttle body. I have a 60mm Mustang TB, bolted directly to the IM.

I also have an '02 R/T PCM. I can tell you, when it hits 4900 rpm, it still kicks you in the butt, as if the MTV in a Magnum IM was opening. So I would say at least part of that is in the PCM program.

The 18 extra hp that the Magnum has is a package deal. I wouldn't look for near that gain with just an IM. You'll need the head, a comparable or better header, cam, and PCM programming. This was also designed around the 3.94 gear ratio.

My car (2001 ES) has the 3.55 ratio, so the power comes on at higher speeds than in a true R/T or ACR.

But if you could design a butterfly valve set up out of lighter weight plastic, and some runners that are larger throughout on the short runner side, and the long runner side decent enough to retain low/midrange torque, you will probably make a few hp, and not have a boat anchor like the factory Magnum IM.

As far as the cold air part, remember there is a huge heat source directly in front of the IM. Unless you thoroughly insulate the IM, or relocate the radiator, most of that CAI is going to waste.

The original intent of CAI's wasn't cold air, it is resonance tuning. Sound waves coming out of the IM from valve noises, hamper air flow coming in. The ducting is designed to reduce those resonance waves. It isn't so much the cooler air coming in, it's the reduced sound pressure coming out, that makes power in those $200 intakes.

The GBI I have is just a manifold with the TB bolted on, and an air filter clamped to that. It sucks air from under the hood. It has no problem pulling from 65 to 90 mph. It will honestly leave my 2.4 swapped '99 behind in that window.