DIY Intake manifold?
Anyone build one? (open mouth insert foot) Looks like it'd be really easy... Seeing the power gains from FM and BEGi's aftermarket manifolds just something that I'd be interested in trying.
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It's been done. I've seen a few of them around. It's not a real popular mod though for some reason. If you can make up the flange then it shouldn't be hard at all. You can even get aluminum plenum that just needs ends and runners with flange welded on.
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something i plan on doing much later this year
i am planning to use OEM manifold and cut the flanges off and make my own plenum and runners and weld it all up goal is to incrase plenum volume and runner thickness and to make them shorter than stock |
Originally Posted by cjernigan
(Post 192222)
It's been done. I've seen a few of them around. It's not a real popular mod though for some reason. If you can make up the flange then it shouldn't be hard at all. You can even get aluminum plenum that just needs ends and runners with flange welded on.
Originally Posted by whaaamx5
(Post 192228)
something i plan on doing much later this year
i am planning to use OEM manifold and cut the flanges off and make my own plenum and runners and weld it all up goal is to incrase plenum volume and runner thickness and to make them shorter than stock http://ecx.images-amazon.com/images/...CL._AA280_.jpg I'm trying to find an article I read several years ago about the volume requirements of an intake manifold but can't seem to run it down.. |
I think it's mostly because people are getting 200+ horsepower without them and don't want to run much more than that most of the time. The people that want crazy power end up with a new intake mani, like MarkP for example and 1badmx5. Both of those guys want 400 and 500 HP respectively.
The cost and knowhow is the most limiting factor i believe. They're not real easy to just throw together with a flux core in your garage so i can understand why people don't do more of it. I personally won't be using one anytime soon. |
i already have a spare manifold, its just a matter that i dont need it yet
once i build my motor and want some serious power ill do it, but for now im ok with the stocker |
Paul made 271 HP at 14 psi with a 2560 with the stock mani, i think you'll be alright. It would be a nice upgrade when time and money allows though. Though headwork would probably be even more beneficial. I don't know myself though.
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Dunno, almost sounds like it really isn't worth the time. What Head and bottom end was paul using?
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Originally Posted by elesjuan
(Post 192230)
I'm trying to find an article I read several years ago about the volume requirements of an intake manifold but can't seem to run it down..
So something like 3.5 to 4 liters for a miata. |
Originally Posted by Efini~FC3S
(Post 192240)
I think it's something like 2 or 2.5 times the engines displacement.
So something like 3.5 to 4 liters for a miata. |
Originally Posted by elesjuan
(Post 192237)
Dunno, almost sounds like it really isn't worth the time. What Head and bottom end was paul using?
VICs system not operational. |
Heh, i was in point pleasant beach couple days ago...
Anyways... we made one just because we wanted too. Should see gains, heck... I expect them... but the build was never about numbers. We made this... http://www.we-todd-did-racing.com/th...8Medium%29.jpg http://www.we-todd-did-racing.com/th...8Medium%29.jpg http://www.we-todd-did-racing.com/th...8Medium%29.jpg http://www.we-todd-did-racing.com/th...8Medium%29.jpg http://www.we-todd-did-racing.com/th...8Medium%29.jpg |
I have cad pattern for 99 head and a few flanges cut out from mild steel.
Flanges I need as spare until mine IRTB gets finished, might be a while though. hrk |
Originally Posted by elesjuan
(Post 192230)
Think the reason for this is just the labor involved or people just don't think its worth messing with?
This was something I was thinking about, grab an escort or Protege mani from the junk yard and slice off the "flange" basically with injector bosses with a bandsaw. Get some aluminum tubes for runners and a rather large aluminum tube for the plenum with a good sized throttle body, something like a BBK 70mm for a 5 liter... I built my intake not for performance but to practice welding aluminum and to allow me to run my intercooler pipes thru the fender and away from the hot radiator. It'd be easier/smarter to just do an over the radiator setup but I'm not smart. I reused the lower half/runners of the factory manifold; the runner length is basically the same as stock. I used a bandsaw to cut off the pleninum. It takes a lot of time and a welder with a really really high current capability. I used the huge lincoln tig they have at work for welding aluminum cylinder heads. My "little" TIG185 couldn't handle the current by a long shot. I could go with a larger TB by just hacksawing the TB flange off and welding another on with the proper mustang or honda bolt pattern. The manifold is all 1/4" aluminum except for the TB flange which is 1/2". Pics: http://www.shoremotorsports.com/pics...ataIntake7.JPG http://www.shoremotorsports.com/pics...ataIntake3.JPG More at the bottom of this page: http://www.shoremotorsports.com/MiscProj.htm |
Originally Posted by whaaamx5
(Post 192228)
goal is to increase plenum volume and runner thickness and to make them shorter than stock
Corky and I have been (occasionally) talking about designing another intake manifold. He isn't completely happy with the current version. (See MarkP's set up.) We're not certain where the deficiency is in the design, but I have a couple of ideas I'm wanting to try once we get my car back on the road. As to "tuning" an intake, the idea is to time the air pulse to be pushing (not rebounding) on the intake valves as they open. So, the length of the runner must be an evenly divisible fraction of the distance the pulse will travel at a specific RPM. - Thus the efficiency is aimed at a small RPM band. - L |
Here's a good thread to look over if you wanna build your own intake manifold:
http://www.galantvr4.org/ubbthreads/...31&Main=554229 Enjoy |
Originally Posted by iWeasel410
(Post 193977)
Here's a good thread to look over if you wanna build your own intake manifold:
http://www.galantvr4.org/ubbthreads/...31&Main=554229 Enjoy |
Originally Posted by paul
(Post 192264)
stock 99 head and bottom(EEK!)
VICs system not operational. |
Originally Posted by slowmx5
(Post 194633)
It's worth getting it running IMO. I have back to back runs on my website of it operating and not operating. Very noticeable and repeatable improvement.
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Originally Posted by cjernigan
(Post 194640)
Man. What a difference. Is that with stock engagement or with you controlling it to turn on at a certain RPM?
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