i think it looks good, and should work real good.. nice job!

 

Whats the 13b cosmo inlet like compared to the FD inlet??

 

motor shouldn't be seeing too high of boost. However, if it really becomes a problem, I can always take the manifold off, cut the flange off and throw a nice thick one on there. Thanks for the info.

 

1" flanges on an intake manifold?

 

Yes.

 

Steel is MUCH more rigid than very weak Alloy, combined with the pipes stiffness to the plenum and if its flat already it will take a hell of a force to distort it (100+psi).

I doubt very much you will have any problems at all

P.S. Lots of people here use M.S. *of similar diminesions* to construct intake manifolds with no issues @ 35psi boost pressures. You will find it far better than welded alloy as it wont crack in service as its much stronger against fatigue, good choice mate 6061 or anything else of heat treated grade is not that after its welded either but the extra thickness does help.

 

Very nice. I especially like the locations of the secondary injectors. Hides all the plumbing and keeps them out of the heat.

 

is there any taper in those runners.i just always figured u would want some sort of taper in the runners to add a bit of velocity and or cut down on pumping losses<------not an expert tho

 

Looks very nice, good job.

 

I wish they were tapered the entire way, but I figured that would be pretty difficult to do w/ mild steel mandrel u-bends.. I flared out the ends of the runners where they meet the plenum, then ground a nice smooth radius after it was welded in. The tubes are crushed down a bit where they meet the engine flange and I tried to put as smooth of a transition into the flange, I've got a couple pics that I'll post up later showing what I mean. Thanks for all the compliments guys! Its nice to see something finished after putting so many hours into it (~50 hrs...)

 

i really dont think you would need a flange thicker then 1/2". whats the length of your runners? sorry im asking so many questions im just so interested and would like to start applying these dimensions to my plans and modifly them a little bit... then its gonna be made of stainless

 

runners are 15". Like I said earlier, I think I would go w/ a little bit smaller diameter runners, it was kinda a bitch matching the runners to the ports, might make the engine a lil happier too. Good luck w/ your project.

 

Looks good man. When are you expecting it to be on the road? I wanna race. Mine will be running in about 2 months.

-Destin

 

I hope she's running by then... but it'll only be n/a so it won't be much of a challenge

 

here's a shot of the portmatched runners:

and here's one of the radius into the runners:

 

I realized it was going to be quite near the downpipe and turbo, so it's been ceramic coated to keep as much heat out of the intake as possible.

 

did you make that out of stainles steel its going to be very hot

i would have mounted the trottle body direct to that 3 inch pipe



look at mine

some more more

 

Its made of mild steel. It only cost me ~$50 alltogether since I had scrap of everything except the u-bends.

Which 3" pipe? I assume you mean the plenum?

I almost wanna make another one now that I have so many things that I'd do differently..

 

i wanted to make one similar like your with 1.5 aluminum bends from burnsstainless
i made the turbo manifold first and when i started building the intake manifold there was no room to clear runner #1
i might still come up with some thing

i think you also got a q45 tb???

 

looks great. how did you make the radiused bends where the runners meet the plenum?

 

its a secret...






Actually, I found something in the shop, i think a socket, that had a bit of a flare on it and it's od matched the id of the tube, then just pressed the tube onto it. Worked great.

 

NICE, thats all i can say

 

looks good...

 

That's damn good for a first time TIG project! How are the middle two runners welded to the flange? From the inside of the port?

 

I tried to get in there as much as I could with the tig, then switched to mig to get in there further, then I welded from inside the port as well, kind of a PITA.