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04-19-2017, 07:16 PM
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#1
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Senior Member
Join Date: Jan 2017
Posts: 464
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Upgrading Spartan's Spartan tail pipe tip
The only thing I can find fault with Spartan is using a car equivalent exhaust tip in an opening that can accommodate 2X the tip. The Freightliner has a duck bill type profile that looks more fitting for a 450 HP engine.
I bought a 4" OD pipe that was 7" long, cut at a fleet supply shop and added a straight 6" tip versus the stock 4" turn down pipe. Looks more fitting.
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2017 Newmar Dutchstar 4369
Spartan - ISL 450 Cummins
2016 Jeep Grand Cherokee tow
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04-19-2017, 07:57 PM
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#2
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Senior Member
Join Date: May 2013
Location: Ontario, California
Posts: 2,429
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You said you now have a straight pipe. It may look nice but the reason they use a turn down is when the engine regenerates. It will throw soot all over the place and it's red hot. (At least this is what I was told by a reputable diesel mechanic)
__________________
[SIGPIC][/SIGPIC]2016 Newmar Dutch Star 4369
Newmar Owners Club
USAF 1966-1969,- Law Enforcement 1969 - 2003, Retired since March 2003
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04-20-2017, 03:32 AM
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#3
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Senior Member
Newmar Owners Club Spartan Chassis
Join Date: Feb 2016
Location: MotorCoach Resort, St Lucie West
Posts: 215
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Quote:
Originally Posted by LJowdy
You said you now have a straight pipe. It may look nice but the reason they use a turn down is when the engine regenerates. It will throw soot all over the place and it's red hot. (At least this is what I was told by a reputable diesel mechanic)
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The reputable mechanic was correct. During regeneration temperatures in the DPF run at approximately 600 degrees. The exhaust then emitted is not at that temperature level but still very hot. I would recommend the turn down pipe.
Bob
__________________
2021 DSDP 4363 Spartan K2, NKK F21594
Bob, Loretta, & Paddy the Westy, No Pronouns, HOOTS
2021 Tesla MYP
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04-20-2017, 03:44 AM
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#4
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Senior Member
Join Date: May 2014
Posts: 1,368
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I like the looks of that straight pipe, but I know I would have an issue with the exhaust blowing directly onto my trailer.
Dtw
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Dan & Loretta, US Army Retired Aero Scout Pilot
2012 Fleetwood Providence 42P Class A/DP
Spartan Chassis, 8.9L Cummins 450HP
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04-26-2017, 10:03 PM
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#5
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Senior Member
Join Date: Mar 2017
Posts: 230
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Quote:
Originally Posted by slsbl77
The reputable mechanic was correct. During regeneration temperatures in the DPF run at approximately 600 degrees. The exhaust then emitted is not at that temperature level but still very hot. I would recommend the turn down pipe.
Bob
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A few corrections....
The exhaust throws NO soot during regeneration...that's defeating the purpose. It's all clean that comes out.
The exhaust also gets north of 1000 degrees. I've lit a cigarette before by putting it in the exhaust stream.
As long as the OP's unit can't do a regen at slow speeds, then it should be fine. But, I personally wouldn't want to find out and would keep the turndown on it.
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04-27-2017, 08:21 AM
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#6
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Senior Member
Join Date: May 2013
Location: Ontario, California
Posts: 2,429
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Chassisguy, I respectfully disagree to a point. The knowledgeable diesel mechanic I referred to in my first post told me on an instance where a straight exhaust pipe tip was used and someone was standing behind the pipe when it regenerated and they were burned by a piece of soot/carbon that flew out of the exhaust system. He cautioned me to leave the tip alone and don't modify it.
Granted it's suppose to be a 'clean' occurrence but what about soot/carbon that builds up on the inside of the exhaust system that's knocked loose during the regeneration process.
__________________
[SIGPIC][/SIGPIC]2016 Newmar Dutch Star 4369
Newmar Owners Club
USAF 1966-1969,- Law Enforcement 1969 - 2003, Retired since March 2003
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04-27-2017, 08:51 AM
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#7
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Senior Member
Join Date: Mar 2017
Posts: 230
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If you look in the exhaust it's like a large catalytic converter. It's almost impossible for much, if any, soot or carbon to build up downstream of that filter. The filter is very fine. Wipe the inside of your tailpipe and see how dirty it is with soot. It's so clean coming out that at one point there were talks of chrome plating the inside of the tailpipes. The old dirty engines would soot up the pipe and it wouldn't rust but the new ones won't soot up.
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04-27-2017, 09:08 AM
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#8
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Senior Member
Join Date: May 2013
Location: Ontario, California
Posts: 2,429
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I believe you however I also believe the mechanic I referred to so, who's correct?
__________________
[SIGPIC][/SIGPIC]2016 Newmar Dutch Star 4369
Newmar Owners Club
USAF 1966-1969,- Law Enforcement 1969 - 2003, Retired since March 2003
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