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Old 04-19-2017, 08:16 PM   #1
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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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Old 04-19-2017, 08:57 PM   #2
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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)
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Old 04-20-2017, 04:32 AM   #3
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Quote:
Originally Posted by LJowdy View Post
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)
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.

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Old 04-20-2017, 04:44 AM   #4
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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.

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Old 04-26-2017, 11:03 PM   #5
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Originally Posted by slsbl77 View Post
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


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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Old 04-27-2017, 09:21 AM   #6
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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.
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Old 04-27-2017, 09:51 AM   #7
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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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Old 04-27-2017, 10:08 AM   #8
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I believe you however I also believe the mechanic I referred to so, who's correct?
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