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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 05-07-2010, 05:13 PM   #1
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exhaust headers design question

how does one design an exhaust header? ive noticed some have straight tubes and most are bent all over the place and twist down to the collector.
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Old 05-07-2010, 05:15 PM   #2
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My understanding the tubes are bent to make all tubes the same length (equal back pressure) and still flow as freely as possible...
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Old 05-07-2010, 05:29 PM   #3
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That is also my understanding.
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Old 05-07-2010, 05:45 PM   #4
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http://www.camaro5.com/forums/showth...ht=bbk+headers

these are different lengths. does that mean these are junk?
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Old 05-08-2010, 04:49 PM   #5
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Quote:
Originally Posted by camaro guy View Post
http://www.camaro5.com/forums/showth...ht=bbk+headers

these are different lengths. does that mean these are junk?
I'll letcha know in 4 weeks when they arrive... I ordered those for my Car.. Primaries are the smallets on the market...but i'm only putting CAI, headers, exhaust, and a tune...so nothing larger performance wise.. I"d go with the 1 7/8" primaries if your lookin to put a pro/super charger on there...

The reason they are angled like that is based on the way the exhaust is exiting the heads i believe... no immediate back pressures from weird angles right out of the heads....But I'm not expert...
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Old 05-08-2010, 05:10 PM   #6
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Old 05-08-2010, 08:02 PM   #7
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Shorty headers look like corkscrews because there is just not enough length to get straight even tubes. Unfortunately you need long tubes if you want any performance gains.
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Old 05-09-2010, 12:18 AM   #8
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wow i learnt something new today!
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Old 05-09-2010, 09:09 AM   #9
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The ones that are all twisted up looking are (usually) equal length headers, or close to it. If you are going full out race setup, you would want equal length long tube headers. The equal length tubes make sure each cylinder breathes the same allowing each to make the same HP, generating a higher overall performance increase. For the street, you'll never notice the difference.

edit - On second look, the BBK shorties are not equal length, but tuned to keep from pushing exhaust gas from one cylinder into another cylinder when the exhaust valves overlap.

Last edited by Eric Baker; 05-09-2010 at 11:06 AM.
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