Getting a new exhaust sys. today

[Reg Evans]

I'm thinking that the larger diameter the tail pipes the lower the tone.

Am I correct? Any words of wisdom for dual exhaust? I don't want J Lo to sound like a high strung hornet.

[Rodger S-11]

Ah Ho Ho Ho Reg

This is some times an "touchie" subject. There are members of this site who believe an better exhaust system is one that sounds better and there are members who believe that an better exhaust system is one that performs better in all manners.

I am of the second group. I feel that louder sound is not performance and louder sound was not what our vehicles were known for back when.

Performace has always been what our vehicles are about. Enough of that.

The RPM's of our vehicles is not the highest. That means an larger diam pipe could mean " lazy air ". If this is so, then an larger diam exhaust system is not the greatest for an engine that is only driven as an regular vehicle.

The exhaust on my vehicles is the same diam as the out-let of the exhaust manifold, to the rear tip. This is as an performance vehicle would be since the average vehicles exhaust system is flared at the exhaust manifold to the manifold size. The smaller diam pipe flared at the manifold end was done as an cost savings to the mfg'r.

I have an extra exhaust manifold for the 236 to one day make into an dual exhaust maniflold. When this happens, it will be with the diam of the out-lets to an twin in-let/single out-let muffler.

Rodger & Gabby

COS

[greg g]

Reg mine is 2 in ID all the way, with a dynomax turbo flow seems to work well, but is quite quiet. Single pipe system. If you think of horns or wind instruments, the higher pitched ones are always the thin ones. Never seem many small diameter Tubas. In retrospect it seems the diameter must have something to do with the pitch.......

[Reg Evans]

I had some air horns once that were kind of high pitched. I cut the tubes before the bell end and added a same diameter 12" length of tube to each one and they sounded like the Titanic. Hey....maybe I could have him make me up some sliding tail pipes like a trombone.

Maybe the exhaust guy will know since he does it every day.

[Plymouthy Adams]

the ole trumpet horns were call that by design...be sure to have the ends bloney cut with the slice facing the dirt..keep the pop pop out...

[Don Coatney]

I am two inch from manifold to tailpipe running through Smithy glass packs. I do not have a crossover pipe. I will let the folks who have heard my car run comment on the sound. And of course the performance part is well known:cool:

[Reg Evans]

Thanks for the photo Don.

My exhaust guy did it differently than yours in that he put smaller (18" long) Magnaflow mufflers farther back right before the tail pipes go up and over the rear axle. He used 2" pipe all the way and did very nice work however I do not like the sound at certain rpm's. It sounds good at idle and up to about 1000rpm but after that it suddenly breaks out into a horrible very annoying staccato sound and makes this sound whenever there is a load on the engine. On the freeway at cruising speed that sound is there full time. CRAP !!!! I don't like it !!! Where'd it go wrong?

[Don Coatney]

Might be the mufflers???

[blueskies]

Where'd it go wrong?

The position of the mufflers, front to back, might also have something to do with it. Since the mufflers are near the rear of the car, there is little pipe after them to quiet them down.

My mufflers are right behind the tranny crossmember.

Pete

[Suddensix]

My set up is very similar to blueskies however just in front of the mufflers the exhaust pipes go into an "X" crossover pipe. That really seems to mellows the sound. I run 35" long smithys into 1/34" tailpipes.

[Reg Evans]

My muffler man is out of town so I can't ask him yet but I was wondering if a cross over might help on mine. The sound is almost like a jake brake sound only higher pitched.

[blueskies]

My set up is very similar to blueskies however just in front of the mufflers the exhaust pipes go into an "X" crossover pipe. That really seems to mellows the sound. I run 35" long smithys into 1/34" tailpipes.

My muffler man is out of town so I can't ask him yet but I was wondering if a cross over might help on mine. The sound is almost like a jake brake sound only higher pitched.

I have a crossover too, but it's not an "x" type. Just a pipe welded between the two.

You can hear sound clips of mine on my site and

.

Pete

[glendale]

i just got my exhaust done on the 24th. marco muffler in sac. 2" with glasspacks towards the rear. i do have a sbc though. my car sounds good not to quiet not to loud.

[BobT-47P15]

I think the longer muffler helps make the rumble more mild. The short

ones are more snappy, like you describe. One local muffler guy says

he uses the longest ones he can get in the duals system he sets up.

I think Smithys come in 22 and 26 or something like that - as well as

the short one. Don't know how much difference the location on the

tail pipe makes.

[pflaming]

Is the sound effect as fussy if the system is a single pipe and mufflerAnd is there enough performance benefit to pay the extra cost for dual pipes?

[Reg Evans]

That's a good question. Has anyone here done a time trial or performance test before and after a dual exhaust,carb.or head milling installation? I didn't with this car because I was also installing a fresher engine along with the other mods.

[Plymouthy Adams]

a three minute egg timer would work here...would have to be a significant difference else they wou;ld not have been popular back then..Tattersfield was a major maker for Mopar flat 6

[Young Ed]

Reg what did you work out for your throttle linkage for the 2bbl?

[Reg Evans]

Reg what did you work out for your throttle linkage for the 2bbl?

Ed, I did the Rube Goldberg thing and used two 2 to 1 bbl adapters so the 2 bbl carb would face the right way on my 2 bbl intake. The stock linkage worked well but the carb did not. I think the 2 bbl carb was squirting too much gas cause there was a real flat spot upon hitting the gas pedal. Maybe I could have it re jetted. I gave up on that carb and put a single stromberg carb on an upside down 2 to 1 adapter so I could get it to the muffler shop. It runs very well this way but what a waste of the 2 bbl intake.

[Young Ed]

Reg that is a waste you are right! Suggest you swap back to a 1bbl and send the 2bbl one my way

I wonder if its just that 2bbl causing you trouble or if its like you said and the engine just couldn't handle that much gas. Did you rebuild the 2bbl carb? Where did it come from originally?

[Reg Evans]

Ed, Here's the carb. It's a Carter B & B. The tag hanging off the thing has # 2896S with 02 under that. Cast into the float bowl is # 0-1383

I got the carb off the Bay and don't know what engine it's meant for. I do have 2 of the 2 bbl intakes. I might trade one for the real McCoy 56 Plym carb.

[Young Ed]

hmmm I've got the carb but then I'd have 2 intakes and no carbs. That could be jetted for a v8 of some sort in which case it might be overkill on the 6.

[Reg Evans]

You got the real McCoy carb ???? What's the number so I can look for one?!?!?!?!? I've never re jetted a carb. How would I find out what jet to use?

[Young Ed]

Reg The one I have looks just like the picture I have of that 56 engine. I'll try to clean it off and see what numbers are on it. The fuel line goes into the side of the bowl instead of the front where your 2bbl has it.

[Young Ed]

OK Reg here's what I found. My carb looks very much like the one pictured. Looking at my carb the same way pictured it says Bendix then Strombery Model WW(possibly WN) on the left side of the throat. Then on the top plate piece above where the fuel line attaches its stamped 3-142.

I'm also thinking its a good sign that these are right by the fact they appear to still be able to use the oil bath air cleaner.