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| Street Exaust specs https://slantsix.org/forum/viewtopic.php?t=26224 |
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| Author: | MichaelS [ Wed Dec 12, 2007 10:18 am ] |
| Post subject: | Street Exaust specs |
Ive seen alot of chat about the exaust sizes for optimal street performance, ie MPG and power. Do you recomend 2 1/4" pipe all the way or just for the head pipe? What have you found works best. I have a 225 with stock carb at the moment, will change to super six when I find one so it should be best with the 2 barrel set up. thanks |
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| Author: | Aggressive Ted [ Wed Dec 12, 2007 10:51 am ] |
| Post subject: | 2 1/4" exhaust |
With the stock carb 2 1/4 all the way back works great!  Try to get them mandrel bent for extra smooth bends.There are three of us in our neighborhood that have made the switch. No losses, performance gains only. I am going to try a Super Six set up and have a four barrel set up waiting as well. |
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| Author: | MichaelS [ Wed Dec 12, 2007 11:35 am ] |
| Post subject: | Tail pipe |
I thought I saw someone suggest a smaller diameter for the tail pipe, why would this be better if at all? |
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| Author: | Matt Cramer [ Wed Dec 12, 2007 11:37 am ] |
| Post subject: | Re: Tail pipe |
Quote: I thought I saw someone suggest a smaller diameter for the tail pipe, why would this be better if at all?
The only advantages I can think of are that it's fractionally lighter and has just a little bit more clearance. Once you're downstream of the header collector or manifold, it's hard to hurt the engine's performance with too big a pipe.
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| Author: | Aggressive Ted [ Wed Dec 12, 2007 12:24 pm ] |
| Post subject: | |
I think they went to smaller tail pipe to cut costs....technically once the exhaust gases start to cool they don't need as much room. Another point is to reduce sound levels. Personally with my tall gearing the 2 1/4 pipe isn't that noisy because I cruise at 2500 rpm which is 60 mph. So from 50 to 60 it is pretty quiet. At 3000 to 4000 rpm the noise level is another matter. You definitely know something is going on......
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| Author: | DusterIdiot [ Wed Dec 12, 2007 1:12 pm ] |
| Post subject: | The 'F-Duster pipe' |
Quote: Personally with my tall gearing the 2 1/4 pipe isn't that noisy because I cruise at 2500 rpm which is 60 mph.
No it's because you have a small opening on the intake side (1 barrel carb) which also determines how your exhaust sounds due to the reversion waves... Once you go for the 4 barrel and open air cleaner it'll get more annoying at that cruise level...The most talked about single pipe is 2.25" from the exhaust manifold to the muffler, then neck down to a 2" or 1 7/8" to keep the noise down (especially if you choose a cheap turbo muffler as the quickie exhaust shop). If it's all correct this might garner about 1-2 mpg highway over the stock noodle pipe, and a smidge of power as the engine can now get the exhaust out a bit faster... I just got my old pipe out of the 'shed' which is built this same way and about to install it into 'beater' valiant so I can see how much HP and MPG I get from going to this over stock... good luck, -D.Idiot |
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| Author: | Aggressive Ted [ Wed Dec 12, 2007 1:18 pm ] |
| Post subject: | |
So a two barrel is going to be allot noisier? I have fully covered (not open) stock air cleaner housings for all three setups with cold air intake hoses for each of them. |
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| Author: | MichaelS [ Wed Dec 12, 2007 3:16 pm ] |
| Post subject: | stock tube size? |
What is the stock exaust tube diameter of a '74 225 dart? Mine is at the shop or I would go out and measure it myself. |
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| Author: | DusterIdiot [ Wed Dec 12, 2007 3:34 pm ] |
| Post subject: | Excuse me while I whip this out... |
Quote: What is the stock exaust tube diameter of a '74 225 dart?
1.875" IDQuote: So a two barrel is going to be allot noisier?
Stock Super Six, no...closed stock (silenced) air cleanerOpen Air Cleaner, no restrictions...yes... (use a Holley 500, definately yes...) Used a cheap muffler/glass pack/ $50 turbo muffler... yes... I just swapped the pipe two hours ago on the Beater Valiant (stock 1 barrel/ 1973 silenced aircleaner...and the noise is about as quiet, but the tone is lower...can't wait until the Holley 2300 goes on...  )-D.Idiot p.s. I just passed a 'fart' 280zx in traffic this morning... the Hpak Duster with dual 2" to the back, was louder than that vehicle when I let the clutch out at 2500 rpm... |
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| Author: | SlantSixDan [ Wed Dec 12, 2007 9:34 pm ] |
| Post subject: | |
In reality, the OE mufflers had baffles and packing. |
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| Author: | 68barracuda [ Thu Dec 13, 2007 2:47 am ] |
| Post subject: | |
I am running a 2 1/4 from front to silencer and a 2 from there out to the back. Was wondering if i should double this system when I have my headers made up 
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| Author: | 66aCUDA [ Fri Dec 14, 2007 7:14 am ] |
| Post subject: | |
68 Barracuda Thats what I am doing from my headers on my 66. Frank |
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| Author: | sandy in BC [ Fri Dec 14, 2007 7:36 am ] |
| Post subject: | |
If a stock.....mufflerd 65 Valiant can scare the crap outta you when it starts , you had better run and hide when I start my car....... |
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| Author: | Brian [ Fri Dec 14, 2007 10:52 am ] |
| Post subject: | |
Quote: If a stock.....mufflerd 65 Valiant can scare the crap outta you when it starts , you had better run and hide when I start my car....... 
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| Author: | Zipper [ Sat Dec 15, 2007 10:55 pm ] |
| Post subject: | |
Quote: If a stock.....mufflerd 65 Valiant can scare the crap outta you when it starts , you had better run and hide when I start my car.......
I know I can with my '68 Dart. I'm looking to do a 2.25 when the time comes, and it has a 4brl offie
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