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12 valve with a terrible fluttering paper bag sound from exhaust. HELP!!!

12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

12 valve with a terrible fluttering paper bag sound from exhaust. HELP!!!

  #11  
Old 12-08-2018, 04:12 PM
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It does flutter with a load but becomes less noticeable in higher gears at higher rpm, Itís most noticeable at idle for sure. As far as a resonator goes I feel like the flutter would still be there just masked more, Iím trying to eliminate the flutter all together even with it straight piped. Iíve heard plenty of 12 valves straight piped without any type of fluttering Iím encountering, there has to be an underlying issue.
 
  #12  
Old 12-08-2018, 07:39 PM
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You said you've had this noise from day 1, then you said you've had it since the HX35. Has it had the HX35 since day 1? Just trying to get this straight.
 
  #13  
Old 12-08-2018, 08:03 PM
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Yes Iíve had this problem since day one with the HX and the problem persists even with the he351, both turbos same issue.
 
  #14  
Old 12-09-2018, 06:47 AM
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Oh, I see. I misunderstood. Hopefully someone else comes through, because this makes no sense to me at all.
 
  #15  
Old 12-13-2018, 11:26 PM
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That sound clip would help. Because I , like many others that have read your post, don't know what sound you're chasing. Could be something simple. Could be something huge.

Considering all of the changes that you have made to the tuck and it still has the sound. I would start with a compression and a leak down test. Just to eliminate a base engine issue. Its also possible that you have an injection pump issue. But there's no way to tell without hearing it ourselves.

While I don't see this being it, have you ever verified the timing on the truck? I've seen timing do funky things.
 
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  #16  
Old 12-14-2018, 11:59 AM
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Thanks for the response Crawler. Yes I need to figure out how to upload a video, I know it would make this a lot easier if it could be heard rather than just what Iím trying to explain. And yes I did the timing myself shortly after the injector and delivery valve install, I bumped up to 18 degrees from 14 and the truck was at factory timing before I did the bump and the flutter was there before and continues to be so.
 
  #17  
Old 02-07-2019, 11:07 PM
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Default Still no luck yet!!!

anybody out there maybe have any new clues on what the issue can possibly be. I can better explain the sound as like an exhaust leak inside the exhaust and out the stacks. Very strange exhaust tone. Would incorrect valve adjustment cause such an issue. Iíve lashed the valves twice now since I installed a new head so I canít imagine thatís it but just a thought.https://share.icloud.com/photos/0ac6...#Las_Vegas,_NV
 

Last edited by Fievalfon; 02-07-2019 at 11:42 PM.
  #18  
Old 02-07-2019, 11:44 PM
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Default Another video

Hereís another video with the down pipe on out the back to just before the Y pipe to the stacks. I know this is not how a 12 valve is suppose to sound. I hope you all can hear what Iím talking about.

https://share.icloud.com/photos/0QWG...#Las_Vegas,_NV
 
  #19  
Old 02-17-2019, 01:38 PM
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Mine sounds like that until it warms up, Are you still on stock governor springs? if so changing to 3k springs will help.
What do you idle at?


 

Last edited by cfm56; 02-17-2019 at 02:14 PM.
  #20  
Old 02-17-2019, 03:39 PM
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I did some thinking, that fluttering sound is the interaction of your exhaust gas with the turbine wheel, at cold start my truck idles at 400 rpm, exhaust flow is not great enough to accelerate the turbo to a sufficient speed where it doesn't disturb exhaust flow, but as the engine warm up the exhaust drive pressure increases speeding up the turbo to a point where it doesn't impede exhaust flow and just sounds smooth with a nice whistle.. Thats why no matter what turbo you put on there that 12 valve will do that. Mine did it with a HX35 and does it with a Cheetah.

Try jamming something in the turbo to prevent it from spinning and see if the sound is still there. No amount of drive pressure will over come a piece of metal holding it static.

TLR

nothings wrong with your truck, its a completely mechanical turbo diesel and its normal with no temperature or barometric pressure compensation. stop worrying and drive it.

Just so you dont think I'm bullshitting, I'm a jet engine mechanic, turbo's are my life, knowing how this stuff works and interacts is my job(I made an account just to type in this thread)... I thought about this for awhile before posting. The other trucks you hear are probably have a high idle, my Idle is set to 750 RPM AC off.
 

Last edited by cfm56; 02-17-2019 at 03:44 PM.

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