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Searhing for OEM-like exhaust system
https://slantsix.org/forum/viewtopic.php?t=19217		 Page 1 of 2
Author:  rebel_cat68 [ Wed Aug 16, 2006 10:21 am ]
Post subject:  Searhing for OEM-like exhaust system
Has there ever been a 2 1/4" exhaust system made for a -73 Valiant?
Have a supersix now so that's why I'm asking.
If there has been, is there any company still selling it? Would prefer with the "quiet package" if possible. Don't like the noise coming thru the back now, with only one muffler, on highway speeds.
BTW my car is equipped with a 4on-the-floor now taken from a -69 Signet, originally there was a 3on-the-floor.
Author:  SlantSixDan [ Wed Aug 16, 2006 10:38 am ]
Post subject:  Re: Searhing for OEM-like exhaust system
Quote:
Has there ever been a 2 1/4" exhaust system made for a -73 Valiant?
Not a 2¼" system front to back, no, not from the factory for any engine in any year Valiant.

The 340 had a 2¼" headpipe and a 1-7/8" tailpipe.

The 318 had a 2" headpipe and a 1-7/8" tailpipe.

The slant-6s in '73 all had head and tailpipes smaller than 2".

The '76 Feather Duster and Dart Lite got a 2¼" headpipe...and a 1-7/8" tailpipe. Starting in '76, the 2bbl slant-6s got this same configuration (2¼" headpipe, 1-7/8" tailpipe).
Quote:
Would prefer with the "quiet package" if possible.
Neither the factory sizes nor the "quiet package" option is relevant to you in 2006. All of the factory-replacement parts have been discontinued and are no longer available from any of the aftermarket exhaust component companies (Walker, Goerlich, Maremont, etc.). Having an exhaust system put on your car is now strictly a custom-build deal.
Quote:
Don't like the noise coming thru the back now, with only one muffler, on highway speeds.
What kind of noise are you getting? A drone, a rasp, a growl? What kind of muffler is on it now?
Author:  rebel_cat68 [ Wed Aug 16, 2006 10:52 am ]
Post subject: 
So no known companies can offer these days a complete system, sad to hear that.
I cannot describe the sound other than it's annoying. The pitch is not that high but the sound is annoying to listen to when driving and this is a daily driver.
Author:  LUCKY13 [ Wed Aug 16, 2006 12:13 pm ]
Post subject: 
I know of one option, but it is not cheap & would take some work on your part also. It is a system for a V8 tho, but it would be no problem to just use half of it for the slant & it only comes upto the cross member so you would have to finish it from there to your manifold. But it is mandral bends & high quality exhaust that is made for any model A body you may have. But like I said it would cost, about $450.00 for the center section & tial pipes. I am going to use them as duels for a turbo setup. If your interested the company is TTI.


http://www.ttiexhaust.com/

There stuff is top notch tho & it would be hard to beat as far as quality, but at a price. If you call them and talk to them they may sell you just the half of the system you need & then this would make it alot cheaper. I havnt tried this but it is worth asking them. There exhaust is among the best fiting & quality out there for the Mopars. But I think 2 1/2 is the smallest they make(not sure on that though).


Jess
Author:  Reed [ Wed Aug 16, 2006 12:58 pm ]
Post subject: 
Try getting a little 18 inch cherry bomb mufler and adding it behind your muffler as a resonator.
Author:  SlantSixDan [ Wed Aug 16, 2006 1:13 pm ]
Post subject: 
It really does not make sense to buy and ship pre-bent pipes. They are large and cost a lot of money to ship even inland (within North America, for instance), let alone overseas. The chances are high that damage will occur in shipping. And, if your car is just a little bit different than the book said it should be, for whatever reason, the pipe won't fit properly.

Find a good local custom exhaust shop -- I know you have them even in Norway -- and have a system made for your car, on your car. Carefully specify that you want a quiet system, not a "sporty" system. Make sure the installer understands that you want original-equipment type quiet exhaust. The strategy will probably be to install a muffler originally intended as an original-equipment replacement for a vehicle (of whatever brand) with an engine of around 3.5 to 4.0 litres.
Author:  ceej [ Wed Aug 16, 2006 7:48 pm ]
Post subject:  Funny you should mention it
I scored a Feather Duster exhuast from DusterIdiot a while back.

Monday I went into my favorite muffler shop and had a new muffler and a 2 1/4" tailpipe installed along with an O2 bung.

$174.50 All done. If it had been from the manifold back, I'm sure it would have been a wee bit more.

It is louder than original with the larger tailpipe.
It sounds good though. Kinda growly going down the road. At an idle, you really can't tell much difference unless you stand behind the car. I had him turn the tip down. It's fairly mellow.

Once the secondaries hit, it sounds a bit more serious.

Just find a good, reputable shop and get a quote. Took less than 45 minutes, including saving the original tailpipe for my local slantsix friends.

CJ
Author:  DusterIdiot [ Wed Aug 16, 2006 10:19 pm ]
Post subject:  Uhhhh.....
Quote:
The '76 Feather Duster and Dart Lite got a 2¼" headpipe...and a 1-7/8" tailpipe. Starting in '76, the 2bbl slant-6s got this same configuration (2¼" headpipe, 1-7/8" tailpipe).

Nope...2.25" head pipe...2.25" to the cat...2.25" to the muffler...1.875" out the muffler....

This thread:
http://www.slantsix.org/forum/viewtopic ... er+exhaust

I still have two of these OEM sets laying around....


-D.Idiot
Author:  rebel_cat68 [ Thu Aug 17, 2006 2:22 am ]
Post subject:  Thanks for the answers
I subscribe to both Mopar Muscle and Mopar Action so I'm familiar with the work that TTI makes.
I've already been talking with the one company that I know makes complete custom systems, but they are about 100 miles away.
They don't have any blueprints for a 2 1 /4" headpipe and the guy there weren't shure if there is enough space for it, so I think I have to drive there so we can get it right the first time.
I also own a -74 Dart Custom with auto and checked that out before, and it has a 2 1/4" headpipe, with ample room in my opinion, though the bends are different due to the auto linkage been about 4" back, than the clutch pedal linkage in my Valiant.

Why has the tailpipe always been 1 7/8" from the factory? Why downsize it from the muffler to the back?

Found one site that sells Cherry Bombs. http://www.racerpartswholesale.com/exhaust1.htm
What's so special with this one except that it's cheap? Corrosion resistance is good when we have salt on the roads during winter.
But other than that the design doesn't look any high tech to me inside, with two pipes with a holelotta holes and that's it.
So what are the major differences in a muffler versus a resonator? Isn't a resonator a "flowthrough" muffler?
Because if I understood 'Reed' correctly I should use the Cherry Bomb muffler as a resonator behind the axle to get the "quiet package" system done, and if so, then I have to position it vertically because of the lack of space between the leaf and the gastank.
BTW I called the local speed shop and the only thing 2 1/4" they could come up with was Flow Tech's 'Raptor' that's 12" long and costs 26 Euros (about $33), no resonators in that dimension, just 2" and 2 1/2". I already have one in the garage, with the pipes as in picture A, in the Cherry Bomb ad, and it's precisely the same design.
Should I use two of them, one as a muffler and the other as a resonator?
I think I have to go to the shop, then all this hopefully will be cleared once and for all.
Author:  SlantSixDan [ Thu Aug 17, 2006 7:34 am ]
Post subject:  Re: Thanks for the answers
Quote:
I've already been talking with the one company that I know makes complete custom systems, but they are about 100 miles away. They don't have any blueprints for a 2 1 /4" headpipe and the guy there weren't shure if there is enough space for it, so I think I have to drive there so we can get it right the first time.
Correct, you definitely want to drive the car to the shop and have them do the work on the car itself, not work to any kind of a blueprint.
Quote:
Why has the tailpipe always been 1 7/8" from the factory? Why downsize it from the muffler to the back?
Because as gas cools off, any given amount of it takes up less volume. Reducing the pipe size towards the rear of the car helps keep the car quiet without producing undue backpressure.
Quote:
Found one site that sells Cherry Bombs. http://www.racerpartswholesale.com/exhaust1.htm
What's so special with this one except that it's cheap?
Nothing special at all.
Quote:
Corrosion resistance is good when we have salt on the roads during winter.
Buy stainless, then.
Quote:
But other than that the design doesn't look any high tech to me inside, with two pipes with a holelotta holes and that's it.
Parts do not have to be "high tech" to work.
Quote:
So what are the major differences in a muffler versus a resonator? Isn't a resonator a "flowthrough" muffler?
Essentially, yes.
Quote:
Because if I understood 'Reed' correctly I should use the Cherry Bomb muffler as a resonator behind the axle to get the "quiet package" system done
The Cherry Bomb is one option for a resonator. They do not last very long in cold and/or salty climates, but there are stainless steel straight-through mufflers of the same general type that will last quite a long time.
Quote:
and if so, then I have to position it vertically because of the lack of space between the leaf and the gastank.
No, we're talking about a cylindrical (round) unit here.
Quote:
BTW I called the local speed shop and the only thing 2 1/4" they could come up with was Flow Tech's 'Raptor' that's 12" long and costs 26 Euros (about $33)
You think you got too much noise now, just wait til you install this pretend-muffler! :shock:

Does Walker or Goerlichs distribute OE replacement mufflers in your country? Call exhaust shops (not speed shops) to find out.
Author:  rebel_cat68 [ Thu Aug 17, 2006 9:40 am ]
Post subject: 
Off to the exhaust shop then...

One more question though, how is the downsizeing done in practice?
2 1/4" in to the muffler and 1 7/8" exit-diameter or does the tailpipes diameter change in the same way as a stepheader?
Author:  Reed [ Thu Aug 17, 2006 9:59 am ]
Post subject: 
If you are going to go ahead and have a complete system fabricated I wouldn't bother with the downsizing. Use the same size pipe for the complete exhaust line.

2 1/4 is a very standard size. You should be able to have the pipe custom bent and choose from a wide variety of aftermarket mufflers.

Try:

www.jegs.com or www.summitracing.com or even www.jcwhitney.com

My brother used to own a 68 Dodge Dart. We had a 2 1/4 inch single exhaust line made up for it and we used a cherry bomb for the main muffler. It was rather loud and the drone was pretty horrible at highway sped, so we added a second smaller cherry bomb behind the rear axle. it helped a little, but it still droned. I recommend a free flowing regular muffler over cherry bombs.
Author:  SlantSixDan [ Thu Aug 17, 2006 10:16 am ]
Post subject: 
Quote:
how is the downsizeing done in practice?
2 1/4" in to the muffler and 1 7/8" exit-diameter

That is a common way to do it.
Quote:
or does the tailpipes diameter change in the same way as a stepheader?
That is another common way to do it. It doesn't matter which way is chosen.

Downsizing will help a lot to keep the system quiet. Running 2-1/4" all the way back, especially if you use a "performance" muffler, will aggravate the drone/noise condition, because it creates a megaphone effect.
Author:  Reed [ Thu Aug 17, 2006 11:18 am ]
Post subject: 
Quote:
Downsizing will help a lot to keep the system quiet. Running 2-1/4" all the way back, especially if you use a "performance" muffler, will aggravate the drone/noise condition, because it creates a megaphone effect.
True, but what is the point of using 2 1/4 at all if you restrict the last few feet of the line with a smaller diameter? If the point is to lessen the restriction on flow by using 2 1/4 pipe, putting a section of smaller diameter pipe defeats the purpose of the exercise. Might as well save some money on the cost of pipe and use the smaller diameter for the whole line.

I still say 2 1/4 pipe wiht a quiet low restriction muffler, followed by a resonator if you really want to be silent.
Author:  SlantSixDan [ Thu Aug 17, 2006 11:33 am ]
Post subject: 
Quote:
Quote:
Downsizing will help a lot to keep the system quiet. Running 2-1/4" all the way back, especially if you use a "performance" muffler, will aggravate the drone/noise condition, because it creates a megaphone effect.
True, but what is the point of using 2 1/4 at all if you restrict the last few feet of the line with a smaller diameter?
You're missing the point: Because gas takes up less volume as it cools, you don't "restrict" the last few feet of the line with a smaller diameter.

You do, however, keep velocity up, and that's a good thing.
Quote:
If the point is to lessen the restriction on flow by using 2 1/4 pipe, putting a section of smaller diameter pipe defeats the purpose of the exercise.
Nope. If we were talking about doing something dumb like using 2¼" pipe off the manifold and then 1-7/8" pipe into the muffler and then 2¼" tailpipe size, then you'd be right, but we're not.
Quote:
Might as well save some money on the cost of pipe and use the smaller diameter for the whole line.
Nope. Hotter gas = larger pipe, cooler gas = smaller pipe. You lose a lot of heat in the muffler. Basic physics. Sometimes the factory did things the way they did...for a good reason! :shock:
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