I'm sure I read on autospeed or somewhere about flanges to make your
exhaust effectively smaller. It was something to do with noise but if
Geordies theory is correct this would be great to have to progressively
open as the rpm's increase. Anyone know of such a system? or would the
complexity of it outweigh (literally) the benefits?
From: [EMAIL PROTECTED]@datascribe.com.au on 27/04/2004 16:48
ZE10
Please respond to [EMAIL PROTECTED]
Sent by: [EMAIL PROTECTED]
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cc:
Subjec Re: exhausts questions
t:
No scientific basis here, but I am under the impression there is an optimum
pipe size for flow
too small and it's restrictive, too large and you don't get the air speed
you need.
Ideally, you would have a small pipe for low rpm and a larger pipe for
higher rpm when more gas needs to flow. and everything inbetween but we all
know that pipes can not change size all by themselves :D
So a typical exhaust system is a compromise of some sort, whether it is
midrange pipe size optimised for midrange power or larger pipe size
optimised for high end power.
----- Original Message -----
From: maldat
To: [EMAIL PROTECTED]
Sent: Tuesday, April 27, 2004 4:12 PM
Subject: Re: exhausts questions
I use 4-1 headers that are quite long, the 4-1 collector is just about
under the seat.
I also use a exhast thats one size down from 2"..everyone else had 2+" and
my car was faster..??
Malcolm
"new theory, you can move more air quicker thru a smaller pi[pe than a big
one.... what do you guys think of that?.
----- Original Message -----
From: Jeff Oldham
To: [EMAIL PROTECTED]
Sent: Tuesday, April 27, 2004 1:51 PM
Subject: RE: exhausts questions
There is some debate about exhausts being too big & not providing enough
back pressure.
But i think its only the first part of your exhaust (the headers) that
affect this.
that why some new exhaust systems run variable exhaust manifolds as it
affects your torque at various revs.
go to about halfway down on this web page for some info.
http://www.autospeed.com/cms/A_46/article.html
I am running 4-2-1 motivator extractors into 2 1/2 with 3" tail pipe &
turbo muffler.
the 4-2-1 (or "y" extractors) give a slightly more spread torque range
than 4-1
I think 2 1/2 inches is biggest that will fit in the rear cross member of
a 510
without enlarging the hole :)
When i got rid of the bit of curtain rod that was on my car i noticed not
more power
but that the engine felt like it could rev out further easier.
BUT i could have it all wrong so ask some professionals :-)
cheers Jeff
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of kla
Sent: Sunday, April 25, 2004 12:47 AM
To: [EMAIL PROTECTED]
Subject: exhausts questions
I've been wondering about sports exhausts, as i was thinking of
getting a system installed (extractors to the back)
and i was wandering. as a general rule. sizes. obviously too small
means not enough flow, but what about big?
what happens when you get too big, and what is generally the best
size for a 1.5litre (standard, non-turbo etc.)
if its too big do you get a dead space effect where it cant move
enough of the air or what?
cheers.
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