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Old 06-07-2010, 02:34 PM   #1
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Location: Clearlake, Northern California
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Year: 1992
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Chassis: TC-2000 Frt Eng, Tranny:MT643
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Re: open exhaust on a 5.9 ?


I tore the muffler off Millicent a long time ago, making more room for water tanks and such. The increase in sound is slight. Healthier, but not loud. A turbocharger is an excellent "muffler".

Also, a long pipe dampens sound somewhat, even with nothing inside it. So you can take the edge off the sound by running a four inch pipe all the way to the rear bumper. But I dump mine in front of the rear tire, and I find it perfectly acceptable.
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Old 07-20-2010, 10:38 PM   #2
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Year: 1991
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Chassis: Ford B-700
Engine: 5.9 liter turbo Cummins
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Re: open exhaust on a 5.9 ?

On my 1978 Chevy crew cab one-ton dually, I removed the 454 gas hog and put in a 6-cylinder turbocharged Perkins diesel. The Perkins manual clealy said that 20 feet or more of exhaust pipe required no muffler, so I am assuming this will be true now for my 5.9L Cummins skoolie. The Perkins manual said the turbo reduced noise.
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Old 08-17-2010, 11:43 AM   #3
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Join Date: Jun 2010
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Year: 1991
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Chassis: Ford B-700
Engine: 5.9 liter turbo Cummins
Rated Cap: 28
Re: open exhaust on a 5.9 ?

Here is an update on the exhaust question. On our 28-passenger 5.9L Cummins-equipped Ford B700, we removed the huge muffler two weeks ago, and replaced it with 4" flexible exhaust pipe. Noise DID go up a little bit, especially when climbing mountains with the 28 kids on board. But I passed vehicle inspection yesterday with no problems. I DO feel the bus is a little perkier.

My two pesos' worth.

Dr. Steve, central old Mexico
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Old 12-26-2010, 03:17 PM   #4
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Re: open exhaust on a 5.9 ?

what do you think smitty,,,give us your two cents.................lol
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Old 12-26-2010, 05:01 PM   #5
Bus Crazy
 
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Join Date: Oct 2005
Location: Clearlake, Northern California
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Year: 1992
Coachwork: Blue Bird
Chassis: TC-2000 Frt Eng, Tranny:MT643
Engine: 5,9 Cummins
Rated Cap: 84
Re: open exhaust on a 5.9 ?

Please be aware that flexible exhaust pipe will eventually crack. Just keep an eye on it.
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