Beta 1 Intake manifold modification
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Joined: Jun 2012
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From: NC
Vehicle: 2000 Hyundai Elantra GLS
Beta 1 Intake manifold modification
I want to make more power on my NA Elantra. It's got Head work, high compression, reground cams ect. (6750 rpm limit still)
I guess my plan is to shorten the runners a bit and add some volume to the plenum. Still thinking about how I want to do it. If you have any advice or thoughts I would greatly appreciate it. I know the airram plenum is angled so it's taller on the side with the throttle body. Is this the way to go?
The only thing I've done is roughed in the inside of the plenum. Started knife edging the runners. Went through in a couple spots but that is easily fixed.
.
Between the tb and the first runner there are some vertical lines cast into the wall. It looks like it's only there to create turbulence. Perhaps to direct air away from the first runners for more even flow to the other cylinder, I guess, idk, I have no idea
I guess my plan is to shorten the runners a bit and add some volume to the plenum. Still thinking about how I want to do it. If you have any advice or thoughts I would greatly appreciate it. I know the airram plenum is angled so it's taller on the side with the throttle body. Is this the way to go?
The only thing I've done is roughed in the inside of the plenum. Started knife edging the runners. Went through in a couple spots but that is easily fixed.
.
Between the tb and the first runner there are some vertical lines cast into the wall. It looks like it's only there to create turbulence. Perhaps to direct air away from the first runners for more even flow to the other cylinder, I guess, idk, I have no idea
Last edited by 2000J25SP; Feb 18, 2020 at 08:14 PM.
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Joined: Jun 2012
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From: NC
Vehicle: 2000 Hyundai Elantra GLS
The opening is only 54mm. There's not much room to enlarge it. So I cut the flange off, either to reprepostition it farther from the edge or to replace it with a different flange/Throttle body.
Perhaps I could just add some rectangular pieces of aluminium in order to increase plenum volume.
Perhaps I could just add some rectangular pieces of aluminium in order to increase plenum volume.
Last edited by 2000J25SP; Feb 18, 2020 at 08:11 PM.
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From: Croatia, Europe
Vehicle: 2003/Hyundai/Coupe
About 12-13 years ago I tried the same thing… made new intake manifold from stainless steel, tried to copy AirRam, made it shorter with larger plenum and 2mm larger BBTB.
Made calculation using VE of the engine, compression, power etc. and power gains was so little… maybe I made wrong calculation and it was stock engine but it wasn’t worth the time and effort in my case
Made calculation using VE of the engine, compression, power etc. and power gains was so little… maybe I made wrong calculation and it was stock engine but it wasn’t worth the time and effort in my case
Thread Starter
Senior Member
Joined: Jun 2012
Posts: 345
Likes: 3
From: NC
Vehicle: 2000 Hyundai Elantra GLS
Awesome. Thank You for responding, great pictures, even a graph! 
I'm sad that you didn't get more power after spending all that time making a whole manifold. I expected there would be a small loss in the low to mid range and a small gain up high. I guess not. It's weird the way power dropped like that after 6500rpm.
I'm sad that you didn't get more power after spending all that time making a whole manifold. I expected there would be a small loss in the low to mid range and a small gain up high. I guess not. It's weird the way power dropped like that after 6500rpm.
Thread Starter
Senior Member
Joined: Jun 2012
Posts: 345
Likes: 3
From: NC
Vehicle: 2000 Hyundai Elantra GLS
I wanted to shorten the runners some but they are too close together to be able to weld all the way around without them leaking.
Last edited by 2000J25SP; Feb 29, 2020 at 04:51 PM.
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