Header extentions?
#1398984
03/08/13 12:00 PM
03/08/13 12:00 PM
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Joined: Jan 2004
Posts: 1,468
N.Y.
sixpacksteve
OP
pro stock
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OP
pro stock
Joined: Jan 2004
Posts: 1,468
N.Y.
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maybe this was asked before, does anyone know how much better performance this will give you? if you paint a line on it,and cut off where it stops.curious if someone has stats.
Hell Hath No Fury Like Mine
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Re: Header extentions?
[Re: sixpacksteve]
#1398986
03/08/13 12:11 PM
03/08/13 12:11 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
maybe this was asked before, does anyone know how much better performance this will give you? if you paint a line on it,and cut off where it stops.curious if someone has stats.
Being that I was in the exhaust lab at Chrysler for
YEARS I played that game... its not a good way to do
it.. just for info.... it doesnt know if the engine
is fat or lean and different colors burn at different
temps... but i you make them 16" to 18" from rhe end
of the primaries you will be real close
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Re: Header extentions?
[Re: Todd]
#1398990
03/09/13 12:47 PM
03/09/13 12:47 PM
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Joined: Jan 2004
Posts: 1,468
N.Y.
sixpacksteve
OP
pro stock
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OP
pro stock
Joined: Jan 2004
Posts: 1,468
N.Y.
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cab burge, what were the results,big-small? i guess its like indexing plugs, guys are not sure but still do it!
Hell Hath No Fury Like Mine
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Re: Header extentions?
[Re: Cab_Burge]
#1398992
03/09/13 03:20 PM
03/09/13 03:20 PM
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Joined: Dec 2005
Posts: 4,233
State of retirement
52savoy
master
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master
Joined: Dec 2005
Posts: 4,233
State of retirement
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Quote:
Quote:
cab burge, what were the results,big-small? i guess its like indexing plugs, guys are not sure but still do it!
.12 to .18 ET pick up in the 1/4 
That's pretty close to what I found in running them on a Hemi. 
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Re: Header extentions?
[Re: emarine01]
#1398997
03/10/13 10:43 AM
03/10/13 10:43 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Does a header extention have any value if its curved... say 45*
Normally we talk centerline length but on a curve you
might want to take the outside radius as the length
and try that... so if you figure the outside radius
you would be long, so try figuring that in
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We use to use a 18 inch, 12 inch and 6 ich colleteor extensions on both of the Hemi Stockers, 727 and 4 speeds, and the 18 inch was always faster 
After discusing our results with a SS/A 4 speed racer he had some big, 4 inch diameter, 18 inch long H pipe and extenions made up for his car, it went faster also 
