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Dual Exhaust routing
https://slantsix.org/forum/viewtopic.php?t=14869		 Page 1 of 2
Author:  bbbbbb9 [ Mon Oct 31, 2005 9:54 am ]
Post subject:  Dual Exhaust routing
I did a search and didn't find any info on how you folks who have installed duals route them Through the tranny crossmember.
I noticed Layson sells modified crossmembers and am confident I can do the same. Have have some of you routed the exhaust?
Is it possible to get one on either side of the tranny (a good trick if doable).
Author:  65 dartman [ Mon Oct 31, 2005 4:05 pm ]
Post subject: 
More years ago than I care to remember, I added 6 into 2 Clifford headers to my slant 65 Dart. IIRC I pretty much routed the driver's side in the stock location and the other side from the header to the rear of the transmission kthen over out the passenger side. My 65 273 4 speed Barracuda has duals done by the POd. Passenger side along the right side of the transmission and does hang a little lower due to the no cutout on the transmission support. Will correct that issue later.
Author:  sandy in BC [ Mon Oct 31, 2005 4:15 pm ]
Post subject: 
If the 65 Formula S was happy enough with a single exhaust , why cant a slant be,,,,go dual 1 1/2"primary pipes for about a metre (OK 36" for Americans)into a Flowmaster "Y" to a 2.5" single tailpipe....better torque,,,no "header buzz". Finish it with a Formula S style square exhaust tip....
Author:  SlantSixDan [ Mon Oct 31, 2005 4:47 pm ]
Post subject: 
Sandy's points are all completely right.

But...

...there is this particularly delicious "rappy" sound one can only get from an inline Six running through front-3/rear-3 duals with no balance pipe.
Author:  Dennis Weaver [ Mon Oct 31, 2005 5:11 pm ]
Post subject: 
Quote:
Sandy's points are all completely right.

But...

...there is this particularly delicious "rappy" sound one can only get from an inline Six running through front-3/rear-3 duals with no balance pipe.
Gawd, Dan the "sound" you're talking about sounds like crap :!: I did everything I could do to have mine not sound that way, including a crossover and small tip mufflers! :lol: It's a very obnoxious sound, particularly with free flowing mufflers.

D/W
Author:  SlantSixDan [ Mon Oct 31, 2005 5:12 pm ]
Post subject: 
Quote:
Gawd, Dan the "sound" you're talking about sounds like crap :!:
We are obviously not talking about the same sound.

DS (besides, any engine sounds good after a couple mugs of TransX.)
Author:  Dennis Weaver [ Mon Oct 31, 2005 5:16 pm ]
Post subject: 
Quote:
Quote:
Gawd, Dan the "sound" you're talking about sounds like crap :!:
We are obviously not talking about the same sound.

DS (besides, any engine sounds good after a couple mugs of TransX.)
I'm talking about the "rappy" sound that you are talking about which at one time emanated from my Duster with 1-2-3/4-5-6 separate duals and the Comp 264 cam. I'm sure we're talking about the same thing. Dif'rent strokes for dif'rent folks! :roll: :wink: :lol:

D/W
Author:  argentina-slantsixer [ Mon Oct 31, 2005 7:51 pm ]
Post subject: 
when I first got my true duals 1-2-3/4-5-6 no balance pipe complete ex, I thought I was in heaven, sounded pretty much like a classy jag, then I got tired of it and the sound that the car made in certain RPM range was making me sick. Add a balance pipe at the hotter spot, increased low end torque and that annoying nise went down considerably, I have now the low-purring style sound of a nice small V8 and the non restrictive ex is virtually undetectable in the city if I don't hit the throttle too much. When I nail the gas, tough, she likes to scream like a banshee.
Author:  bbbbbb9 [ Tue Nov 01, 2005 5:47 am ]
Post subject: 
Thanks all! It sounds like a single for me.
Author:  Avenger2040 [ Tue Nov 01, 2005 8:27 am ]
Post subject: 
I´m really thinking about going dual exhaust using a X-Pipe in the center, but if I do that I fear I will need to remove my little muffle tip and put a new pair that don´t make much noise or none.
Author:  Dart270 [ Tue Nov 01, 2005 10:22 am ]
Post subject: 
Duals are ONLY good for looks or sound quality on a Slant. You definitely do not need them for flow. A "Y" into single 2.5" (as Sandy said) is good for all but monster builds, and 3" would be fine after that.

Lou
Author:  argentina-slantsixer [ Tue Nov 01, 2005 6:59 pm ]
Post subject: 
Quote:
Duals are ONLY good for looks or sound quality on a Slant. You definitely do not need them for flow. A "Y" into single 2.5" (as Sandy said) is good for all but monster builds, and 3" would be fine after that.
Lou
I beg to differ.

I think that a good tuned dual exhaust is better than a single on a slant. Even better because it doesn't paradiddles (the V8 firing order causes this rhythm... very well defined as paradiddling by SSD)

Depending on your rear end ratio, you don't even need a balance pipe (if your rear axle has higher than 3.23 numerical ratio, you won't be noticing nothing on the low end with non-balanced duals). If you're below 3.23, a good balance pipe (mine is about where the trans ends) will make some diffrence both in cutting down annoying vvvbroooms at certain rpm ranges and will improve low end torque without hurting top end low backpressure.

And definitely if you want to go EFI or dual 1 barrels or dual staged small 2 barrels, duals is a good thing to have. I'm prepairing my new induction system wich will include dual hallmeters, one sensor on each branch, so I can monitor both carbs separately and do the fine tuning even more precise.
Author:  SlantSixDan [ Tue Nov 01, 2005 7:15 pm ]
Post subject: 
All I can say for those saying the sound sucks is: Go beg a ride in Bob Stepp's ratty silver '66 Dart 4-speed wagon. Ask him to accelerate onto a highway. Roll down the window, close your eyes and ignore the duct tape upholstery, and just by the sounds coming out of the car, you'll think "1961 Ferrari GT250 California".
Author:  Dennis Weaver [ Tue Nov 01, 2005 7:34 pm ]
Post subject: 
...you need to go for a ride in the Duster - it sounds pretty bitchen with the ceossover pipe. :)

I agree with Lou. In the future, it'll be a big single exhaust system with a straight six for me. All the "rapping" tells me theres a bunch of dead air in there, and I want to keep the velocity up, not start/stopping of the flow.

D/W
Author:  sandy in BC [ Tue Nov 01, 2005 9:49 pm ]
Post subject: 
at the risk of....

My theories on single exhaust v/s duals came to fruition as a result of 2 different projects. (1 61 Falcon with a 305" Ford 6 with Clifford headers and dual exhaust (2 an 84 Suburban 4x4 with a factory 250 Chev 6 with Factory split manifold

The Chev had a factory split manifold with dual primary pipes 32" long and 1 3/4" dia...these led to a 2 1/4" Y and 2 1/2" tail pipe and Muffler. The factory carb was 1/2 of a Rochester Q-jet (primary/secondary)

The Clifford header gave far more "peak" power and way more off peak "noise"

The Chev had a very wide torque band and a pleasing tone at any RPM

The Chev sounded "tuned"...and it probably was. It made more usable torque than any six I ever had with the least fuss.

The Ford was noisy , peaky and way fun for the 23 year old I was at the time.

All my builds (V8 or 6) now use the same principle as the Chev 6: Primary tubes of the right size and length leading to a Y and a "sewer Pipe" tail pipe and Muffler. It broadens the torque band and reduces the need for a restrictive muffler to reduce sound.

My tow vehicle (73 Sub , 350 TBI with split duration Comp cam) uses Hedman Elite headers with 2.25 primaries to a 3" flomaster Y and a stainless Flowmaster 3" Muffler to a full length 3" tail pipe.

This increased usable torque considerably, reduced exhaust system cost and increased sound quality. Dont worry,,,,at full throttle with a load it still sounds like a P51 with a short runway.
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