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 Post subject: 2.5” exhaust for /6?
PostPosted: Fri Jun 14, 2019 2:45 pm 
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2 BBL ''SuperSix''
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Joined: Wed Jan 23, 2019 4:18 pm
Posts: 17
Car Model*: 1985 Dodge D100
I have acquired several pieces of 2.5” exhaust with various bends and lengths for free. My only concern is loss of power at the low end RPM range. My /6 is in an ‘85 Dodge D100 2WD automatic trans. It is my daily driver and regularly tows about 2000 pounds. Thanks for the help, and, all my parts have arrived for my HEI conversion, thanks to this forum and users on it.


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PostPosted: Fri Jun 14, 2019 4:51 pm 
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Guru
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Joined: Sat Oct 12, 2002 11:22 am
Posts: 3554
Location: Sonoma, Calif.
Car Model*: Many Darts and a Dacuda
Use the 2.5 "head pipe" and step-down to 2.25 or 2' thru the muffler.
Step the pipe size down again ( 1.875 or 1.75) for the tailpipe, to keep the noise level down and prevent a 'drone' at higher RPMs.
Works for me...
DD


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PostPosted: Fri Jun 14, 2019 6:26 pm 
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3 Deuce Webber
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Joined: Sat Jan 27, 2018 4:26 pm
Posts: 56
Location: Utah-Idaho border
Car Model*: 1964 Dart 270
I installed a 2.5" system with a 2.5" muffler on my dart. It is a bone stock 64 with a pertronix conversion, the power is better at all rpm compared to stock exhaust. The only thing with 2.5" might be a little noisier than some people like.

Just for reference I quit my A body /6 habit in the mid nineties to drive Neons for a long time. Even the 132hp base model neons had 2 1/4" mandrel bent exhausts from the factory. No need to go smaller than that unless you want less noise, and even then I would just throw a resonator at the end instead if it were me.

Those Neons were more powerful than /6's though, lots of stock dyno runs from neons show 115-120 wheel horse power, which no factory /6 had that I am aware of.

Brandon

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PostPosted: Fri Jun 14, 2019 6:57 pm 
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EFI Slant 6

Joined: Thu Jun 04, 2015 6:19 pm
Posts: 252
Location: Florida
Car Model*:
"My only concern is loss of power at the low end RPM range."

There is nothing to support that concern here that you have shared, so far, and IMO a 2.5" is smart choice, with little downside.


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PostPosted: Sat Jun 15, 2019 1:16 am 
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2 BBL ''SuperSix''
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Joined: Wed Jan 23, 2019 4:18 pm
Posts: 17
Car Model*: 1985 Dodge D100
Thanks for the help. One more thing, “2 bbl super six” is on my profile under my user name. I checked the FAQ page and all the options in my control panel but didn’t find how to change that. I don’t have a super six, it’s just a single bbl bone stock Dodge D100.


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PostPosted: Sat Jun 15, 2019 1:44 am 
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Supercharged

Joined: Thu May 12, 2005 11:50 pm
Posts: 6105
Location: So California
Car Model*: 64 Plymouth Valiant
1985Sixer wrote:
“2 bbl super six” is on my profile under my user name.



It's based on post count

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64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes
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PostPosted: Sat Jun 15, 2019 6:34 am 
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Joined: Thu Oct 17, 2002 7:27 pm
Posts: 12145
Location: Park Forest, Illinoisy
Car Model*: 68 Valiant
I had 2-1/2" on a bone stock motor in my old Duster. It didn't really do much of anything as far as making the car faster, but it did collect a lot of water in the muffler. I figured it was because the pipes was so big the exhaust was cooling off before it got out. Doug's way of stepping down the pipes makes sense. If you do the 2-1/2 all the way back, drill a few small drain holes in the low spots. :oops:

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