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Dutra Duals or Headers
https://slantsix.org/forum/viewtopic.php?t=48714		 Page 2 of 2
Author:  Rug_Trucker [ Sat May 05, 2012 11:27 am ]
Post subject: 
Set the crossover as far forward as possible.
Author:  DusterIdiot [ Sat May 05, 2012 4:17 pm ]
Post subject:  You could...
Quote:
Is there some formula for how far the H is from the exhaust manifolds?
A good backyard trick is to paint your dual exhausts from under the firewall to about the tranny crossmember(or if headers from the flange to the crossmember) and run the car at high rpm (3000rpm or better)...look for the spot that is most burnt...locate your H-pipe there...

-D.Idiot
Author:  emsvitil [ Sat May 05, 2012 4:57 pm ]
Post subject: 
I think an X pipe would be slightly better than an H pipe........
Author:  ceej [ Sun May 06, 2012 10:29 am ]
Post subject: 
Better yet, run a single exhaust. Cut your system weight nearly in half. Simplify, and get basically the same performance results for a street driven car. (If not better.)
It will certainly live longer.

2¢

CJ
Author:  sandy in BC [ Sun May 06, 2012 11:03 am ]
Post subject: 
Run 2" primaries 32" long to a Flowmaster "Y" and run a single pipe 2 1/2" to a quality muffler and single to the rear. Most torque for a street build.

If you need a wow factor run a 3" single from the "Y".......and add a homemade Formula S tip.
Author:  Dart270 [ Mon May 07, 2012 3:03 am ]
Post subject: 
+1 on Sandy...

Lou
Author:  60jerry [ Mon May 07, 2012 7:39 am ]
Post subject:  My Dutra Dual install
Thanks for the responses to my question about the "H" or "X" pipe position. Seems I have two ideas there. I'll need to make a decision on that.

Interesting other ideas about routing into one tailpipe. I'm a bit old for the "bling thing", and am wanting to acquire the cool smooth sound of a split manifold six cylinder engine. I've never heard a slant six with a split, but while in high school in the early sixties, many guys had 216 and 235 Chevy's with splits. Damn but that sounds neat. A much cooler sound than a V-8. The slant 6 should sound similarly to the 235 since the firing order is the same. I think that all inline sixes are the same firing order.

I would like to get all the low and midrange torque I can, but high performance isn't the goal.

I surely do like this car site.

Thanks

Jerry in Denver
Author:  Doc [ Mon May 07, 2012 9:34 am ]
Post subject: 
Another vote for the 2 into 1 "Y" pipe system.
I use that type of system on most all of my SL6 set-ups.
DD

Image
Author:  Rug_Trucker [ Mon May 07, 2012 9:50 am ]
Post subject: 
My step dad had a 55 or 56 Chevy truck with Fenton exhaust manifolds, 2 1bbls. He ran straight pipes out to the bumper. It wasn't very loud.
Author:  '67 Dart 270 [ Mon May 07, 2012 10:50 am ]
Post subject:  manifold and exhaust pipes
Yes,

I too would like to see a pic or two of the H pipe or an X pipe set up under the Dart, where to run the pipes. I'm sure any competent muffler man could do a set up, but with a pic it would make it so much easier.

Also, thanks to DD for the info on the Offenhauser, great. Now that I had the whole weekend to ponder it (installed a remote hood release in my '67 dart) I think I might as well go with a four barrel or two two barrels with the Offenhauser set up. I prefer the two two barrels, but does anyone run the single four barrel offenhauser? It seems like the two carb set up would distribute fuel better, but if the single four is good, it would be much less work to set up. If I'm running the Dutra Duals with 2 1/4 in exhaust pipes, what four barrel would be optimum balance (in to out, so to speak)? What two barrels are best for the two two set up?

thanks all,

'67 Dart 270
Author:  sandy in BC [ Mon May 07, 2012 11:26 am ]
Post subject: 
What other (internal) modifications are you doing to this motor?
Author:  '67 Dart 270 [ Mon May 07, 2012 3:17 pm ]
Post subject:  other modifications
OK, call me simplistic, but I was going to order a long block from a reputable engine rebuilder. Essentially I was going to get the "towing package" cam for low end torque and maybe shave the head and/or block for some compression enhancement. The rest would be bolt on performance.
Author:  Fopar [ Mon May 07, 2012 5:01 pm ]
Post subject: 
"am wanting to acquire the cool smooth sound of a split manifold six cylinder engine. I've never heard a slant six with a split, but while in high school in the early sixties, many guys had 216 and 235 Chevy's with splits. Damn but that sounds neat. A much cooler sound than a V-8. The slant 6 should sound similarly to the 235 since the firing order is the same. I think that all inline sixes are the same firing order. "

Jerry those Chevy 6 cyl had the manifold split 2 & 4 . The slant six are usually split 3 & 3 so the sound isn't like a Chevy 6 from the old days.

Richard
Author:  60jerry [ Tue May 08, 2012 7:28 am ]
Post subject:  split six
Fopar,

Funny you should mention the split 2 and 4. I've never seen that on any of the Chevy sixes, but have heard many people tell about it. Even my late father told me of splitting his 216 '41 Chevy 2 and 4. The Fenton headers that I've seen are all 3 and 3. Have you ever seen Fentons with 2 and 4? I gotta tell ya, I'd like to hear how that sounds.

Jerry
Author:  CNC-Dude [ Thu May 10, 2012 10:08 am ]
Post subject: 
You also have to remember that the old Stovebolt engines had 2 cylinders that had siamese exhaust ports(only 4 ex. ports with 6 cylinders), kinda' like the Flathead Ford V8 with only 6 exhaust ports and 8 cylinders, so the sound of those engines with a split manifold is going to be somewhat different than an engine that truly has 6 individual exhaust ports in the head and is split.
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