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Oh... well... to heck with that then I thought it helped with hp and stuff... I do need to go get some work done on my exhaust though, the previous owner chopped out the catalytic converter. And, there's a pretty significant crimp in the pipe...
Necoa #: 6381
Location: 7(AL,GA,TN)
Joined: Nov 02, 2005
Posts: 1019
Year: 1986
Model: El Camino
Posted: Wed Aug 06, 2008 5:37 pm Post subject:
bear in mind that a large single pipe will look strange and may cause clearance problems around the rear end. if you go that route at least stick a big Banks muffler back there to look like a diesel (or a ricer) _________________
Formerly 86Conquista
Currently undergoing resto.
Planned:
-350/?/3.42
-ZQ8 wheels
-Disc Brakes
-More
I ran a single 2.5" exhaust on mine with a Camaro 2.5" single in and dual out flow and it worked great. Sure the flow of exhaust would of been better with some short headers and a better Y pipe but I prefered a single exhuast on my elky.
When I went from single to dual with Flowmasters I noticed a significant MPG increase, it went from 18 to 22 highway.
I'm curious about one thing though... over the weekend I was watching the Red Bull Air Races. The typical engine is a Lycoming 502ci opposed six and the commentators would make a point to comment that many of the planes have now changed from dual exhausts to single for an INCREASE in HP. They neglected to explain why. _________________ Leo
1986 El Camino
1997 Lincoln Mark VIII LSC
"Randy! He drives an El Freakin' Camino! That's like the Cadillac of cars!"
Earl Hickey
When I went from single to dual with Flowmasters I noticed a significant MPG increase, it went from 18 to 22 highway.
And, that's what I was wondering about... I've heard that dual exhaust can help with that, which is why I was curious. Replacing my carb nabbed me an extra 4 mpg, but that still only puts me at 16... And with gas prices rising, any work I do towards that end will pay for itself fairly quickly.
I can see it having an increase in torque going to the single, but then I do recall some guys running large diameter single exhaust on some Camaros and Formula Firebirds a few years ago. _________________ "Still Just Truck'in"
"Johnny"
Bradley, Illinois
When I went from single to dual with Flowmasters I noticed a significant MPG increase, it went from 18 to 22 highway.
And, that's what I was wondering about... I've heard that dual exhaust can help with that, which is why I was curious. Replacing my carb nabbed me an extra 4 mpg, but that still only puts me at 16... And with gas prices rising, any work I do towards that end will pay for itself fairly quickly.
I just drove down to Truck Carlisle from LI on Friday. Tonight I filled up for the return trip tomorrow morning... 233 miles on 11 gallons... thats 21 MPG, not bad I'd say. _________________ Leo
1986 El Camino
1997 Lincoln Mark VIII LSC
"Randy! He drives an El Freakin' Camino! That's like the Cadillac of cars!"
Earl Hickey
When I went from single to dual with Flowmasters I noticed a significant MPG increase, it went from 18 to 22 highway.
And, that's what I was wondering about... I've heard that dual exhaust can help with that, which is why I was curious. Replacing my carb nabbed me an extra 4 mpg, but that still only puts me at 16... And with gas prices rising, any work I do towards that end will pay for itself fairly quickly.
I just drove down to Truck Carlisle from LI on Friday. Tonight I filled up for the return trip tomorrow morning... 233 miles on 11 gallons... thats 21 MPG, not bad I'd say.
If I could get that many mpg, it would be worth having to pay for 2 mufflers every time I go through them... but, I don't drive in winter, so they should last a loooong time.
I think I just have stock exhaust more-or-less at the moment, though someone chopped the Catalytic converter out. With an upgrade to either large diameter, or dual exhaust, would I benefit at all?
You know in addition to gearing and exhaust a lot about MPG has to do with power to weight ratios. I cruise at about 70 depending on the speed limits so I'm not really pushing it, the engine is barely working at those speeds. _________________ Leo
1986 El Camino
1997 Lincoln Mark VIII LSC
"Randy! He drives an El Freakin' Camino! That's like the Cadillac of cars!"
Earl Hickey
Necoa #: 61
Location: 4(MD,VA)
Joined: Jan 31, 2003
Posts: 67
Year: 1979
Model: El Camino
Posted: Tue Sep 23, 2008 5:13 pm Post subject: Single versus dual exhaust
I found a very interesting article at "Third Generation Camaro" just a few weeks ago. Now I'm thinking about shorty headers to a single exhaust, 2 1/2 inch should do the trick _________________ NECOA #061
IYAAYAS
i have knelt at the alter of dual exhausts for as long as i can remember. however, a couple of things have dawned on me in the last few years that have started to throw a different light on the idea. dual's advantage over 'stock' single exhaust should be pretty obvious, but if we are talking simple volume and flow rates, one large pipe has about the same effect as two small pipes. you can get better torque with a cross over pipe or an X joint, which essentially makes for one pipe at that point. and it has also been shown over the course of decades with motorcycles that have well designed 4 into 1 exhaust can make better power over bikes with open or multiple exhausts. also, stock cars....engines that need precise exhaust control, are using one large exhaust system in conjunction with performance-designed baffles [tuned in with the intake and cylinder/valve design].
things start to get complicated when we start talking about exhaust flow, feedback and harmonics, and the power gained over the weight of a full dual vs. single exhaust, but what it boils down to with a car that is mostly driven in day to day traffic with only an occasional high speed blast is will it be more for looks or actual performance. what i would like to see is a large single exhaust built with oval pipe, as this would answer the issue of clearance as well as flow. _________________ Rob Tabish
Missoula, Montana
77 El Camino
83 Toyota Landcruiser
81 Honda CB900F
81 Honda CB900Custom
Necoa #: 10837
Location: 2(CT,MA,ME,NH,RI,VT)
Joined: Jan 22, 2008
Posts: 15
Year: 1984
Model: El Camino
Posted: Sat Oct 18, 2008 1:05 pm Post subject:
I Made My Exhaust True Duals from the manifolds and no cats with cherry bomb super turbo mufflers and felt a significant increase in hp but mostly torque
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I thought it helped with hp and stuff... I do need to go get some work done on my exhaust though, the previous owner chopped out the catalytic converter. And, there's a pretty significant crimp in the pipe...
(or a ricer)
I can see it having an increase in torque going to the single, but then I do recall some guys running large diameter single exhaust on some Camaros and Formula Firebirds a few years ago. 
