IM ALWAYS AMAZED AT GUYS THAT JUST SLAP ON factory HEADERS



Re: IM ALWAYS AMAZED AT GUYS THAT JUST SLAP ON factory HEA

Postby 87vette81big » October 3rd, 2013, 8:29 am

I did some more online research Grumpy.
Big tube headers are available for a SBC C4.
1-7/8" with 3" or 3-1/2" collector.
EM. Exotic Muscle.
Mild steel. Ceramic coated.
Stainless available.
Someone had 1-7/8" step into 2" or visa versa.
Base price $1500.
I don't like how EM made equal length tubes on # 8 & #7 Cylinders.
Multiple S bends used.
Flow balance issue still..

Kook Headers will make what I want.
No one has stepped up to the plate .
I may be the 1st.
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Re: IM ALWAYS AMAZED AT GUYS THAT JUST SLAP ON factory HEA

Postby grumpyvette » March 9th, 2015, 5:32 pm

Stinky wrote:Back in my younger days, a performance car just had to have dual exhausts.

Hypothetically speaking, if designed correctly, will a large single pipe perform as well as duals?


your engine won,t know the difference between a properly designed dual exhaust AND A PROPERLY DESIGNED single exhaust, it SEES and REACTS to BACK PRESSURE and the cross sectional area and length of the exhaust, all those factors, can be calculated, for either design,

if your header collectors are 3" in diam. they have approximately a 6.7 SQUARE INCH CROSS SECTIONAL AREA, a y pipe feeding to a mandrel bent 4" exhaust with its 12.6" cross sectional area would provide virtually the same flow speed and resistance as a dual 3" exhaust, in fact a properly tuned single 4" feed from the dual 3" header collectors SHOULD produce a bit more uniform torque curve as the exhaust pulses are blended more uniformly so in theory scavenging may be improved. exhaust exits the engine in distinct high pressure pulses every 90 degrees of rotation this is not a consistent high pressure flow, the pulses exit like a chain, each link a bit separate but linked to the preceding and following pulse, or mass has the inertia of the fast flowing exhaust if properly timed by the cam timing and exhaust header design can significantly increase exhaust scavenging of the cylinder during the cam timing over lap, thus improving efficiency and the resulting power curve

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THE NASCAR RACE CARS HAVE A MODIFIED SINGLE EXHAUST
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related info
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viewtopic.php?f=56&t=495

viewtopic.php?f=56&t=3155
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
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Re: IM ALWAYS AMAZED AT GUYS THAT JUST SLAP ON factory HEA

Postby 87vette81big » March 9th, 2015, 6:22 pm

NASCAR ALSO GAVE US OVALIZED EXHAUST TUBING.
DUAL 3" & 4" OVAL TUBING IS AVAILABLE .
Not inexpensive but I like the Hardware.
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Re: IM ALWAYS AMAZED AT GUYS THAT JUST SLAP ON factory HEA

Postby 87vette81big » March 9th, 2015, 6:23 pm

NASCAR Version of the Super T10 Shown also.
Or a JERICO 4-Speed Manual Trans.
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