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Originally Posted by Portmaster
Yeah right, They should just make 2.5 inch header tubes and dump them into 4 inch exhaust on everything. E7 heads into 1-3/4 headers and into 3 inch exhaust has very little exhaust velocity and won't pull the charge from the next cyl firing so it hurts power. You amaze me sometimes
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Here we go.... the exaggeration/generalization card again....
So you need "velocity" all the way to the exhaust tip with a smaller ID exhaust?..... a 44% decrease in the flow cross section area past the header will cause an increase in the exhaust velocity and not hamper scavenging past 3000 rpm? ... 4500 rpms? And the ideal exhaust velocity is?
I wonder why they (even stock 302's with E7 heads) perform better with open headers allowing more A/F to be added ...
.... Oh that's right....
.... why do I get this notion of the scavenging to be a pulse/wave based phenomena adjusted/tuned for at the header/collector/extension, after which, a better flowing (as in no backpressure inducing to increase "velocity") exhaust system would allow to improve the inhaling breathing cycle of the engine?
John.... if you don't want to build on the better exhaust system you currently have.... YCYDYP, pay to add restrictions to the breathability of your current setup....
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ACRONYMS:
LUK=Let Us Know, GL=Good Luck, LMK=Let Me Know, JIC=Just In Case, BTSTDTRT=Been There Seen That Done That Repaired That, YCYDYP=Your Car Your Dough Your Prerogative and the classic... DILLIGAS=Do I Look Like I Give A S***
1986 GT-X303-289 heads-1.72 rockers-RG 4+1 Trans.
Quote:
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Originally Posted by Joel5.0
Great thoughts will overwhelm a feeble mind.
There is never money to do it right, but there's always money to do it over.
The proof of understanding is the ability to explain it. (H. Torruella)
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