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Old 04-05-2010, 11:02 PM   #1
atycki
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Performance Intake manifold

Hi guy.

I read about how header will help with power. I was wandering, since aftermarket headers help with power. Like the 4 to 2 to 1, for the torque or the 4 to 1 for the HP, and wanted to know if there is something like that for the intake side of the engine.

I wanted to try a 4 to 2 to 1 intake manifold. I'm sure I'll have to do some cg wind tunnel tests to see how the air coming in from the initial opening will spread into the two smaller pipes, and from those two, to the four that feed the engine.

I waned to know some input with your thought. I'm willing to put in the time to get more MPG.


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Old 04-05-2010, 11:07 PM   #2
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It'd end up being more of a restriction than a power adder.
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Old 04-05-2010, 11:13 PM   #3
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Welcome!

From what I understand, it's a little more complex than that. The issues surrounding intake flow and exhaust flow are quite different.

On the intake side, there are a couple of options: You can find a 2000 IM (which is one piece instead of two) and port it for better flow. You can often find them on the buy/sell/trade thread below. Alternatively, Ford Racing also makes a great aftermarket intake manifold, although it's pricey and requires a 70mm throttle body. If you go with a forced induction set-up, many of the superchargers have their own IM. Finally, there are a few guys who have experimented with individual throttle bodies for each cylinder, but that gets crazy expensive.

Hope that helps.
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Old 04-05-2010, 11:25 PM   #4
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be careful fabricating your own intake manifold. you could easily hurt the performance of the engine if you dont know exactly what you are doing. ford racing makes a very nice intake manifold that costs about $700 if i remember correctly and you can only run the ford racing 70mm throttle body with it which costs another $350. they are GREAT pieces but very expensive. if you get lucky you might stumble across a focus central IM which work pretty well and can be used with a stock or aftermarket 65mm throttle body of your choosing. those are extremely rare as not many were made and focus central is out of business now. you may also luck up and come across a custom "log style" intake manifold. generally these can be a pretty safe bet because 90% of the ones ive come across came off heavily turboed engines but once again you need to be wary of the custom jobs because they could cause more problems than good. if you see one you like run it through here and get the opinions of some people.

another thing to note is that most of the aftermarket intake manifolds arent going to do you very much good unless you have a super hard core N/A build or are using some type of forced induction like turbo, supercharger, or nitrous. a ported 2000 IM isnt all that great either. you might net 1-2 hp at most and probably will pick up a little better throttle response but that would be it. on a bolt on engine you would probably have a pretty severe drop in bottom end power with anything except the 2000 IM.
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Old 04-06-2010, 08:16 AM   #5
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First dump the headers your talking about and get the SVT header if the best is what your after

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Old 04-06-2010, 09:13 AM   #6
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Quote:
Originally Posted by CarDemon View Post
Welcome!

From what I understand, it's a little more complex than that. The issues surrounding intake flow and exhaust flow are quite different.
Not to mention header design works on using scavaging to help increase exhaust velocity, and I'm pretty sure it doesn't work in reverse.
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