DIY Intake manifold?
#1
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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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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..
#5
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.
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.
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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...
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".
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Last edited by TurboTim; 01-03-2008 at 08:32 AM.
#15
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
#16
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
http://www.galantvr4.org/ubbthreads/...31&Main=554229
Enjoy
#17
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
http://www.galantvr4.org/ubbthreads/...31&Main=554229
Enjoy
#20
You know I can't remember exactly, but my testing showed that the best switch point was close, or a little above, the stock position. About 5300-5400rpm IIRC - my graphs don't cross there mainly I suspect due to smoothing carried out in DLL. I can take a look at my TECgt file later and let you know.
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