Header design idea
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From: Baltimore
Header design idea
I was reading on Koenigsegg's supercar effort, and one of the topic that caught my eye was their supercar's exhaust manifold (header) design. Mr. Koenigsegg said "the exhaust manifold (on their supercar) has a step tube configuration - narrower tube, then it widens up to improve torque figures"
Would this have any application effect on our little 4 banger?
Would this have any application effect on our little 4 banger?
Joined: May 2001
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From: On a fencepost
Was the step inside a section?
The Spoon manifold, uses 3 diameters - one for the primary, a bit larger for the (short) 2 section, then the final size. Is the Koenigsegg changing inside a section? So the primary pipe widens along the section?
Sounds interesting... but tricky to make! I spent a while just looking at my Spoon manifold think what a work of craftsmanship it was without any additional complications!
-Brian.
The Spoon manifold, uses 3 diameters - one for the primary, a bit larger for the (short) 2 section, then the final size. Is the Koenigsegg changing inside a section? So the primary pipe widens along the section?
Sounds interesting... but tricky to make! I spent a while just looking at my Spoon manifold think what a work of craftsmanship it was without any additional complications!
-Brian.
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Joined: Sep 2001
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From: Carcassonne
Hold on, isn't that Swedish beast turbocharged?
He's done a certified 340 KPH (210 MPH) before running out of road
It sounds as though he kept the primaries narrow to improve gas velocity (Taco Bell Registered Trademark) into the TC...
He's done a certified 340 KPH (210 MPH) before running out of road
It sounds as though he kept the primaries narrow to improve gas velocity (Taco Bell Registered Trademark) into the TC...
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From: Fort Worth
Ummm... this is just anti-reversion, also known/applied as reversionary "cones."
The idea is that you want to step the tube sizing so that it doesn't impact flow (greatly) in the "normal" flow direction, but so that when the exhaust pulses attempt to reverse when the valves close, you break up the flow in the opposite direction. It helps improve scavenging and reduce the likelihood of "reversion" in the primaries.
The Mugen header for the Prelude uses a "stepped" flange for anti-reversion. I haven't seen the S2000 one yet up close, but I would bet it does also.
The idea is that you want to step the tube sizing so that it doesn't impact flow (greatly) in the "normal" flow direction, but so that when the exhaust pulses attempt to reverse when the valves close, you break up the flow in the opposite direction. It helps improve scavenging and reduce the likelihood of "reversion" in the primaries.
The Mugen header for the Prelude uses a "stepped" flange for anti-reversion. I haven't seen the S2000 one yet up close, but I would bet it does also.
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