View Full Version : Dual Exit Exhaust?
I was walking along the road to uni, seeing the usual Porsche Turbo's, Jag XK and XJ's and was wondering
What is the function of a dual exit exhaust pipe? I don't see how it could be more efficient as such? :confused:
If you noticed those cars have TWO banks of cylinders, hence they use TWO exhausts, and it IS more efficient to use TWO hence why they DO.
disco-tom
27-04-2004, 20:27
Aaw, Vez. I don't think anyone wanted to say, really.... ;)
Was my reply patronising enough? I can edit on suggestion? :wack:
disco-tom
27-04-2004, 20:45
Well, if I had the knowledge to have replied in a proper, technical way, I'd have done so. But seeing as I don't, I thought it best to just let it be.. :wack:
If you noticed those cars have TWO banks of cylinders, hence they use TWO exhausts, and it IS more efficient to use TWO hence why they DO.
that makes so much sense. D'oh :wack:
i must have been too confused after seeing all those saxo's and novas with dual exhausts! :wack: :wack:
i must have been too confused after seeing all those saxo's and novas with dual exhausts! :wack: :wack:
All is forgiven my child, you are clensed, you may go now :D
disco-tom
27-04-2004, 20:59
And if you're lucky, Vez might even be kind enough to delete this thread for you. :D
hehe.. If more exhausts make an engine go faster then the corsa in this thread should fly at the speed of sound! :D
http://www.sxoc.com/vbb/showthread.php?t=89176
AshT_200
27-04-2004, 21:10
If you noticed those cars have TWO banks of cylinders, hence they use TWO exhausts, and it IS more efficient to use TWO hence why they DO.
WTF has that got to do with it? Scoobies have twin banks of cylinders, but only one exhaust :nod:
It cos it looks better innit :D
Maybe this is a dumb question too, but here goes...
The standard S14a exhaust has 2 exit pipes (albeit off one back box). I like the look of this, and it's a bit different to all the jap exhausts that you could hide a dead body in... But all the aftermarket performance exhausts I can find seem to be the jap style. Is this just the fashion, or do they actually perform better than the twin exit ones? (Of course I am assuming that the area of the two pipes is the same as one fat one...) Maybe they sound different?
Hope this makes sense... :confused:
Martin T
27-04-2004, 22:03
On a standard car there are a variety of reasons. One of them is noise. 2 pipes with the same flow capabilities will not drone as much as 1 of larger bore for instance. Also twin exits tend to be associated with power/sports cars etc.
So, is noise the only consideration? Or are there performance implications as well? I quite like the look of the dual pipe boxes...
Has anyone else seen em for sale, and could point me in the right direction?
Martin T
27-04-2004, 22:14
So, is noise the only consideration? Or are there performance implications as well? I quite like the look of the dual pipe boxes...
Has anyone else seen em for sale, and could point me in the right direction?
My mongoose has 2 pipes.
http://www.tarala.me.uk/images/sigpic4.jpg
Spot the (unusually) dead cossie in the background :D
ScoobyDoo
27-04-2004, 22:47
WTF has that got to do with it? Scoobies have twin banks of cylinders, but only one exhaust :nod:
Scoobies are only 4 cyl though, most standard twin exhausts seem to be on 6 or 8 cyl engines - has it got something to do with exhaust cycle?
sroberts
27-04-2004, 23:21
http://www.200sx.org/gallery/s14/blown_away2.jpg
Si :)
The Artist
27-04-2004, 23:30
Mine has two exit pipes from one back box but its not the standard one....quite large bore and the pipes are like an angle cut to them.....sounds nice though as someone told me the other day...
No to keen on the 'blunderbuster' exhausts that seem the standard these days....
Scoobies are only 4 cyl though, most standard twin exhausts seem to be on 6 or 8 cyl engines - has it got something to do with exhaust cycle?
The cylinders on the boxer engine are opposed to each other though aren't they, rather than in-line on most 4 cylinder engines.
I think it's generaly to do with how v & horizontaly opposed engines have their exhaust manifolds setup, how much power is to be produced and how much space there is to have the exhaust gasses come together to exit from a single exhaust... or not, as the case may be :)
imo for straight engines.. twin exhausts are an utter waste of time and weight .. and space. it's almost always going to be cheaper (on space and weight) to widen the bore than to double the amount of pipework.
2 Black Lines
28-04-2004, 08:07
Personally I thought it was just for looks.
Its only when manufacturers spend tons on developing a low back pressure or some other specific design element into the design that needs more than one tail pipe( BMW M3 CSL/ Ferrari 360 Challenge), most American V8's have been using cross-over pipes for years, tho they do run split systems.
Just thought I'd confuse things a bit :wack:
and then of course there's the difference between a N/A engine and a F/I engine ie: one needs backpressure and the other needs flow.
2 Black Lines
28-04-2004, 08:34
and then of course there's the difference between a N/A engine and a F/I engine ie: one needs backpressure and the other needs flow.
and turbo engines :nod:
Mine has two exit pipes from one back box but its not the standard one....quite large bore and the pipes are like an angle cut to them.....sounds nice though as someone told me the other day...
Which one have you got then mate?
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