hi, how about having several of those exhaust cut out things that have a cable operated flap? a few of them and you could cut of ,divert etc exh gases ???
mark k ----- Original Message ----- From: "Richard Webb" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, April 27, 2004 5:45 PM Subject: Re: exhausts questions > > > > > 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] > > > > To: <[EMAIL PROTECTED]> > > > 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. > > --membersozdat---------------------------------------------------- --- > > OZDAT Mailing List Please Note:- > Send (un)subscribe requests to [EMAIL PROTECTED] > Send submissions to [EMAIL PROTECTED] > No unauthorised redistribution of this email > http://www.ozdat.com/ozdatonline/index.htm > http://www.ozdat.com/ozdatonline/listindex.html > http://www.mail-archive.com/[EMAIL PROTECTED]/ > ------------------------------------------------------------------ --- > > --membersozdat------------------------------------------------------- > OZDAT Mailing List Please Note:- > Send (un)subscribe requests to [EMAIL PROTECTED] > Send submissions to [EMAIL PROTECTED] > No unauthorised redistribution of this email > http://www.ozdat.com/ozdatonline/index.htm > http://www.ozdat.com/ozdatonline/listindex.html > http://www.mail-archive.com/[EMAIL PROTECTED]/ > --------------------------------------------------------------------- > > --membersozdat------------------------------------------------------- > OZDAT Mailing List Please Note:- > Send (un)subscribe requests to [EMAIL PROTECTED] > Send submissions to [EMAIL PROTECTED] > No unauthorised redistribution of this email > http://www.ozdat.com/ozdatonline/index.htm > http://www.ozdat.com/ozdatonline/listindex.html > http://www.mail-archive.com/[EMAIL PROTECTED]/ > --------------------------------------------------------------------- > > --membersozdat------------------------------------------------------- > OZDAT Mailing List Please Note:- > Send (un)subscribe requests to [EMAIL PROTECTED] > Send submissions to [EMAIL PROTECTED] > No unauthorised redistribution of this email > http://www.ozdat.com/ozdatonline/index.htm > http://www.ozdat.com/ozdatonline/listindex.html > http://www.mail-archive.com/[EMAIL PROTECTED]/ > --------------------------------------------------------------------- > > > > > > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[EMAIL PROTECTED]/ ---------------------------------------------------------------------
