intake manifold pics for my single FD project...
03-12-06, 10:49 AM
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intake manifold pics for my single FD project...
This is pretty much my first project using TIG, so welds aren't great looking. I'm happy with how it turned out though. Car will be run by a motec m400 and tuning by Paul Yaw.
03-12-06, 11:03 AM
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it's a 80mm q45 throttle body. I don't have any flow numbers on it so I can't say for sure how much better it would flow over stock. I tried to design it with the most gradual bends while maintaining the runner length I wanted, 15", and also tried to have the runners go straight as long as possible before entering the port to help with velocity. Also, it has velocity stacks going into each runner from the plenum, so that should help flow a bit.
03-12-06, 01:51 PM
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03-12-06, 01:56 PM
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i like how the entry angle into the motor isn't so steep as the stock manifold. that way it's a more gradual turn, instead of basically a u-turn when the air enters the motor. port-match that thing to the block and it'll be GREAT!!
fitting a turbo around it might prove a little tricky, but i'd love o see some pice of that when you're done.
fitting a turbo around it might prove a little tricky, but i'd love o see some pice of that when you're done.
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03-12-06, 02:49 PM
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Yeah, after I welded it, I realized I should have gone a lil thicker, but I'm not too worried about it. If I remember correctly, its 1/4" steel. It bolts up nice and flat to the block. May look thinner than it really is w/o much reference.. the plenum is just under 6" diameter.
Guitarjunkie, it's been portmatched to the block, and yeah my goal was to get rid of that rediculous bend the stock manifold uses right at the block. The angle on my manifold is actually the same angle as the port runners in the engine. it seems like mazda made it that way so they wouldn't have to put as much of a bend in the intake manifold to make as much room for the heat soakers, err I mean stock twins...
Fitting a turbo is definatly going to be a bitch considering my original plan was to use a t6 hotside and run a 4" downpipe to move enough air for the bridge.. Looks like I may end up having to go w/ a t4 instead
Guitarjunkie, it's been portmatched to the block, and yeah my goal was to get rid of that rediculous bend the stock manifold uses right at the block. The angle on my manifold is actually the same angle as the port runners in the engine. it seems like mazda made it that way so they wouldn't have to put as much of a bend in the intake manifold to make as much room for the heat soakers, err I mean stock twins...
Fitting a turbo is definatly going to be a bitch considering my original plan was to use a t6 hotside and run a 4" downpipe to move enough air for the bridge.. Looks like I may end up having to go w/ a t4 instead
Last edited by 2a+RoN; 03-12-06 at 02:53 PM.
03-12-06, 03:11 PM
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Originally Posted by 2a+RoN
Guitarjunkie, it's been portmatched to the block, and yeah my goal was to get rid of that rediculous bend the stock manifold uses right at the block.
:
one question though. with the runners so short, it's probably going to move your powerband up in the rpm range. i thought that the higher the rpm, the smaller the plenum. i'm not knocking you by any means--just curious.
03-12-06, 06:48 PM
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I went with this size plenum after discussing it with Paul. He did some calculations from the size throttle body and at 8k rpm, the air coming into the plenum would be traveling ~227 mph. What he told me is basically, the bigger the better since the air coming in past the TB will have more space to slow down and change directions rather than causing turbulence in a smaller plenum. And I doubt it'll crack, it weighs a good deal less than the stock manifolds, and shouldn't get all that hot. I might tie in a brace to the block at the TB flange for some added stability since I'm going to have to make a bracket to hold the throttle cable near there anyways.
. What kind of engine and turbo setup are you going to be running this on??
03-12-06, 07:27 PM
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engine is a 1/2 bridge w/ some meaty exhaust ports. Not 100% sure on turbo yet, but right now I have a gt4288 (gt4088 comp wheel and gt42 82mm turbine wheel, weird diesel turbo config...), 1.15 t6 hotside and dual wastegates. I've still got to build the exhaust manifold, but I need to figure out exactly what I'm going to go with first.
03-12-06, 07:28 PM
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Originally Posted by 2a+RoN
I went with this size plenum after discussing it with Paul. He did some calculations from the size throttle body and at 8k rpm, the air coming into the plenum would be traveling ~227 mph. What he told me is basically, the bigger the better since the air coming in past the TB will have more space to slow down and change directions rather than causing turbulence in a smaller plenum. And I doubt it'll crack, it weighs a good deal less than the stock manifolds, and shouldn't get all that hot. I might tie in a brace to the block at the TB flange for some added stability since I'm going to have to make a bracket to hold the throttle cable near there anyways.
cool. i definately wanna see the dyno sheet when it's all done!!
03-12-06, 08:18 PM
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Well, od on the primaries are 1 1/2 and 2ndaries are 1 3/4, I wish I woulda gone a bit smaller now. So at .049 wall that puts the primaries at ~1.402 and 2ndaries at ~1.652. I think the plenum ended up being 5 3/4 or so in diameter, I'd have to go measure it to be more exact, tho.
03-12-06, 11:48 PM
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Originally Posted by T04Eneedy
but where are ur injectors going to be placed?
The injectors for the primarys are in the block.
-Alex
03-13-06, 12:17 AM
#25
Originally Posted by 2a+RoN
Yeah, after I welded it, I realized I should have gone a lil thicker, but I'm not too worried about it. If I remember correctly, its 1/4" steel. It bolts up nice and flat to the block. May look thinner than it really is w/o much reference.. the plenum is just under 6" diameter.
Guitarjunkie, it's been portmatched to the block, and yeah my goal was to get rid of that rediculous bend the stock manifold uses right at the block. The angle on my manifold is actually the same angle as the port runners in the engine. it seems like mazda made it that way so they wouldn't have to put as much of a bend in the intake manifold to make as much room for the heat soakers, err I mean stock twins...
Fitting a turbo is definatly going to be a bitch considering my original plan was to use a t6 hotside and run a 4" downpipe to move enough air for the bridge.. Looks like I may end up having to go w/ a t4 instead
Guitarjunkie, it's been portmatched to the block, and yeah my goal was to get rid of that rediculous bend the stock manifold uses right at the block. The angle on my manifold is actually the same angle as the port runners in the engine. it seems like mazda made it that way so they wouldn't have to put as much of a bend in the intake manifold to make as much room for the heat soakers, err I mean stock twins...
Fitting a turbo is definatly going to be a bitch considering my original plan was to use a t6 hotside and run a 4" downpipe to move enough air for the bridge.. Looks like I may end up having to go w/ a t4 instead
It's gonna leak under boost. Even the factory intakes are prone to leaking on the primary ports at high boost. I always use 3/4 inch to 1 inch 6061 to help with that problem.