Everyone with EXUAST ? read
12-19-2001, 04:20 PM
#1
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Everyone with EXUAST ? read
I hate to start stuff on my first post but, when it comes to using pipe larger than 2.5 the problem has nothing to do with losing back pressure. Anthing larger will allow the exaust gases to slow down-cool off- become dense- create more back pressure. Hope I don't **** any body off and by the way HI I am a new member with a Black 94 SE 5 speed with 97k in RI (20 y/o male) Thanks
12-19-2001, 05:20 PM
#2
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Re: Everyone with EXUAST ? read
Originally posted by PATRICK94SE
I hate to start stuff on my first post but, when it comes to using pipe larger than 2.5 the problem has nothing to do with losing back pressure. Anthing larger will allow the exaust gases to slow down-cool off- become dense- create more back pressure. Hope I don't **** any body off and by the way HI I am a new member with a Black 94 SE 5 speed with 97k in RI (20 y/o male) Thanks
I hate to start stuff on my first post but, when it comes to using pipe larger than 2.5 the problem has nothing to do with losing back pressure. Anthing larger will allow the exaust gases to slow down-cool off- become dense- create more back pressure. Hope I don't **** any body off and by the way HI I am a new member with a Black 94 SE 5 speed with 97k in RI (20 y/o male) Thanks
Bwahahahaha... jk... my Greddy is 2.5, so I am in the clear right?
12-19-2001, 06:07 PM
#3
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Hey! thats freakin wierd!
you have a black VE 5 speed in RI and your name is patrick. sounds alot like someone i know...oh yeah..ME!
what town you in? you've probably seen me around if you're around SK and 'gansett...(black 92 SE, stained stock SE rims, no grill emblem, clear corners, up until today i didnt have my back seat in, blue APC headlights, APC blue corners, yellow fogs).
drop me a line
beakmoney on AIM
madmax024@aol.com for email.
-PaT-
you have a black VE 5 speed in RI and your name is patrick. sounds alot like someone i know...oh yeah..ME!
what town you in? you've probably seen me around if you're around SK and 'gansett...(black 92 SE, stained stock SE rims, no grill emblem, clear corners, up until today i didnt have my back seat in, blue APC headlights, APC blue corners, yellow fogs).
drop me a line
beakmoney on AIM
madmax024@aol.com for email.
-PaT-
12-19-2001, 07:10 PM
#5
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Posts: 2,105
Originally posted by Bman
I think 2.5" is just about right. I just remember reading that for single exhaust pipes, a car with 150-200 cubes pushing 200 horses should use a 2.5" exhaust. 2" if you can somehow run true duals.
I think 2.5" is just about right. I just remember reading that for single exhaust pipes, a car with 150-200 cubes pushing 200 horses should use a 2.5" exhaust. 2" if you can somehow run true duals.
12-19-2001, 08:57 PM
#6
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OK it looks like I got ahead of my self here what I meant was I have been visiting this site since about september (before that I had a V6 Stratus that I thought was fast) and notice all of the posts about exuast mention anything bigger than 2.5 is two much for a 3 liter engine. That is true however not because there won't be enough back pressure as usualy stated but because it will start a cycle of exaust gases slowing down,becoming dense, and creating more back pressure then you started with. If you get it exactly right in theory there is potential to get almost a vacum effect. As far as a dual set up I am not sure but I am asuming you will split it as close to the end as possible so I guess 2" should be ok.
MADMAX I actualy grew up in Sk my mother lives in the Oaks but I am Currently in Warwick
MADMAX I actualy grew up in Sk my mother lives in the Oaks but I am Currently in Warwick
12-19-2001, 10:01 PM
#7
Originally posted by PATRICK94SE
That is true however not because there won't be enough back pressure as usualy stated but because it will start a cycle of exaust gases slowing down,becoming dense, and creating more back pressure then you started with.
That is true however not because there won't be enough back pressure as usualy stated but because it will start a cycle of exaust gases slowing down,becoming dense, and creating more back pressure then you started with.
12-19-2001, 10:07 PM
#8
No. What he is saying is a large exhaust diameter will cause the exhaust gas velocity to slow down. It won't really create backpressure. But think of blowing into a straw and then a huge 4" pipe. See how the flow stays fast in the straw but in the 4" pipe, the flow pretty much stops about 1" into the pipe? If this happens, you lose all of the potential scavanging effect of the smaller dia. pipe. Now exhuast diameter theory is much more complicated than my post. Do a search on the net of you want more info. I ain't writing a thesis on this one again. 
Originally posted by James92SE
Ummm, so in essence you're saying that if you go bigger than 2.5", you'll create MORE backpressure? Ummm....
Ummm, so in essence you're saying that if you go bigger than 2.5", you'll create MORE backpressure? Ummm....
12-19-2001, 10:13 PM
#10
Originally posted by Jeff92se
No. What he is saying is a large exhaust diameter will cause the exhaust gas velocity to slow down. It won't really create backpressure. But think of blowing into a straw and then a huge 4" pipe. See how the flow stays fast in the straw but in the 4" pipe, the flow pretty much stops about 1" into the pipe? If this happens, you lose all of the potential scavanging effect of the smaller dia. pipe. Now exhuast diameter theory is much more complicated than my post. Do a search on the net of you want more info. I ain't writing a thesis on this one again.
No. What he is saying is a large exhaust diameter will cause the exhaust gas velocity to slow down. It won't really create backpressure. But think of blowing into a straw and then a huge 4" pipe. See how the flow stays fast in the straw but in the 4" pipe, the flow pretty much stops about 1" into the pipe? If this happens, you lose all of the potential scavanging effect of the smaller dia. pipe. Now exhuast diameter theory is much more complicated than my post. Do a search on the net of you want more info. I ain't writing a thesis on this one again.
12-19-2001, 10:15 PM
#11
Originally posted by PATRICK94SE
Exactly I just made it sound more complicated
Exactly I just made it sound more complicated
12-19-2001, 10:31 PM
#13
Nope. Dense air is contracted not expanded like hot exhaust air.
Originally posted by PATRICK94SE
OK here we go, if the velocity slows down the gases are in the exaust system longer leading to potential to cool down (CAI theory cool air is more dense) dense air then must be pushed out
OK here we go, if the velocity slows down the gases are in the exaust system longer leading to potential to cool down (CAI theory cool air is more dense) dense air then must be pushed out
12-19-2001, 10:38 PM
#14
Originally posted by PATRICK94SE
OK here we go, if the velocity slows down the gases are in the exaust system longer leading to potential to cool down (CAI theory cool air is more dense) dense air then must be pushed out
OK here we go, if the velocity slows down the gases are in the exaust system longer leading to potential to cool down (CAI theory cool air is more dense) dense air then must be pushed out
12-19-2001, 10:45 PM
#16
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No problem at all with either of you JAMES OR JEFF I kinda enjoy
these exchange as long as they don't go to far they can
be very informative. Besides as A "newbie" I expect a little #### busting and I am sure the are problems with my explanation as well as how I explained it. But hoped it might help some people a little
these exchange as long as they don't go to far they can
be very informative. Besides as A "newbie" I expect a little #### busting and I am sure the are problems with my explanation as well as how I explained it. But hoped it might help some people a little
12-20-2001, 12:58 AM
#18
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Join Date: Aug 2001
Posts: 2,941
I remember reading a long time ago about someone who built a custom dual exhaust system for his musclecar (a Nova or AMC or something) and it took this theory very very seriously. The piping started off at like 3" off the header collectors, then necked down to 2.5" midway, then ran 2.25" out of the mufflers!
All this because he was worried about loosing exhaust velocity! I think even the magazine's editors thought this measure was excessive. No point here, just an interesting anecdote.
All this because he was worried about loosing exhaust velocity! I think even the magazine's editors thought this measure was excessive. No point here, just an interesting anecdote.
12-20-2001, 05:35 PM
#19
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Originally posted by Bman
I remember reading a long time ago about someone who built a custom dual exhaust system for his musclecar (a Nova or AMC or something) and it took this theory very very seriously. The piping started off at like 3" off the header collectors, then necked down to 2.5" midway, then ran 2.25" out of the mufflers!
All this because he was worried about loosing exhaust velocity! I think even the magazine's editors thought this measure was excessive. No point here, just an interesting anecdote.
I remember reading a long time ago about someone who built a custom dual exhaust system for his musclecar (a Nova or AMC or something) and it took this theory very very seriously. The piping started off at like 3" off the header collectors, then necked down to 2.5" midway, then ran 2.25" out of the mufflers!
All this because he was worried about loosing exhaust velocity! I think even the magazine's editors thought this measure was excessive. No point here, just an interesting anecdote.
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