Manifold For Supercharged Car
 

Made this for a supercharged civic with a b20 Dart block.
It's mostly just tacked together right now.

http://www.discreteautos.net/racing/manifold/sc/c2.jpg

It's a 2 step manifold.

Re: Manifold For Supercharged Car
 

it would make more power if it were turbo :-\


nice header though!!

Re: Manifold For Supercharged Car
 

What is the theory behind the two step?Not doughting just curious.Looks good though nice work.

Re: Manifold For Supercharged Car
 

I like it! I need to do one for my car this season too.

Re: Manifold For Supercharged Car
 

Its not easy to explain, but I'll give it a go. Each exhaust pulse sends out two waves, a fast one and a slow one. The fast one gets to the collector and bounces back like sound wave. At that point it becomes a reversion wave and hits the oncoming exhaust flow. The step stops the reversion wave before it gets to the smallest tube. This increases the window for exhaust scavanging to occur.

Exhaust scavanging is like a micro-vacuum created outside the exhaust port in the manifold. At a certain velocity in the exhaust flow it gets strong enough to where it actually sucks out exhaust gas. At this point you see a jump in power. So by changing the position of the step, you can change the window of scavanging to occur wherever you need it (low rpm, mid range, top end).

To get this right, there is a lot of math involved which I havent learned yet. Hopefully I explained the idea behind a step correctly. If I said anything wrong, feel free to correct me. In this manifold, I just stuck it in there and hopefully we'll see some sort of power increase.

Re: Manifold For Supercharged Car
 

No that actually made perfect sense.That sounds like basically a trial and error on the dyno to see where the power is going and what gains are made.I guess that explains why high end race headers for all motor Hondas are so expensive as R&D is expensive and time consuming.You sell headers or is this a one off thing for a customer/friend?I have a buddy with a LS/Vtec 92 Teg we are doing the all motor thing on as the compression is to high for boost and we have been trying to find a reasonable priced header that makes worthwile gains.

Re: Manifold For Supercharged Car
 

I'll have to see how this manifold does. As of now it's just a one off for a customer. If it does well, I'll think about putting it into production.

Re: Manifold For Supercharged Car
 

So the "step" is basically just a smaller tube inside of a larger tube? Is there another step at the collector from the larger tube? or is that just a trick of the camera?

Any more pics?

Re: Manifold For Supercharged Car
 

Where do you put the turbo? ???

:P
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Re: Manifold For Supercharged Car
 

that's right, i remember asking my auto teacher about the difference between a 4-2-1 header vs a 4-1. this technique only works if each tube is equal length, and how far down the collector is affects whether its more for low, mid, or high rpms. closer to flange for low, closer to cat for high. the header he's making will probably be best for low-mid rpms. thats assuming it is +99% equal length.

just go on ebay and look up a REAL type-R header, or even the DC Sports type R. both 4-1 with 2.5in collector near the end of the header. i've heard its possibly the best header you can get for a honda.