Exhaust Wrap

[pcarlson]

What do you guys think about using an insulation blanket on the exhaust like the attached photos? My thinking is I would keep the DPF and other catalysts in their preferred temperature range (hot). I'm also inclined to think that the passive regen would be more effective.



Any thoughts?



These photos are courtesy of ATP.

 

[HBarlow]

My guess is if additional heat retention was desired for the regen mode the engineers would have built it that way. I'd be reluctant to tamper with it.

What if heat retention raises the temperature in the catalytic converter or diesel particulate filter to a level that exceeds design capabilities and causes unanticipated damage?

The new emissions equipment may be too sensitive for backyard engineering and too expensive to damage and be forced to pay for replacement after unintended consequences.

 

[pcarlson]

My guess is if additional heat retention was desired for the regen mode the engineers would have built it that way. I'd be reluctant to tamper with it.



What if heat retention raises the temperature in the catalytic converter or diesel particulate filter to a level that exceeds design capabilities and causes unanticipated damage?



The new emissions equipment may be too sensitive for backyard engineering and too expensive to damage and be forced to pay for replacement after unintended consequences.

Harvey, heat retention is desired. Have the engineers got this system right yet? DPF's need a sustained temp of 600-700 degrees F to passive regen properly and temps above 1000 degrees to active regen. DPF's are also desired to be mounted as close to the manifold as possible. How close is ours to the manifold?



Now don't take my word for it but inquire to Donaldson, Cummins and CAT as to what their DPF and DOC heat requirements are. Exhaust blankets are used on commercial applications for the DPF's and its function is to retain heat so the DPF cleans properly. In some commercial applications that had DPF problems with pluging do not have that problem anymore and the only change was the blanket. In other words heat is designed into the systems and engineers have designed this for the commercial applications so are they backyard engineers?



Our systems are also exposed to ambiant temperatures which draw heat away from system and a wrap would minimize that exposure. How much heat is drawn away at -20? Then drive 65mph and I would guess that there is a substantial heat loss. If you have your EGT probe reading 1000 degrees at the manifold what is the ECU reporting on its EGT down stream?



You have good points but I believe that you are off-base on this one. My secondary intention was if there was interest I would set up a TDR purchase price with the vendor in the vendor section.



This is just my two cents and the approach to handling future DPF problems and I do not expect everyone to agree, you included Harvey but it is a better option for myself than taking the DPF off the truck. To clarify I have not had a DPF problem as the truck is still new but I also want prevention and an engineered solution that has worked on other applications and that is why I decided to do this to my truck.

 

[HBarlow]

I wasn't criticising your idea or disagreeing, I simply don't know what, if anything, will happen with increased heat. I'm too cautious, considering the cost of a DPF, to take the risk of damage without knowing how it will turn out. If you never experience any emissions related problems in 30,000 miles or so it could be proven an excellent idea.

Keep the members posted on your results.

 

[Bob4x4]

That is correct high egts are required if you notice the engineers have taken another step to increase egts by going to a smaller intercooler. The pipe itself can last with exhaust wrap.

I have had my turbine housing and downpipe wrapped with a double layer on my 94 for ay least 10 years with no ill effects

 

[CKelley1]

a better solution is to delete the egr and do a 5" turbo back with a donoldson muffler that way wiith the dpf in the scrap pile temp not a problem and 20% better mpg is not bad ether

 

[Jim W]

I am not sure what the latest trend are with the off highway equipment manufactures since I retired from one this year. But we were extremely concerned with under hood temps doing damage to fuel lines, wiring and hydraulic lines. This is why we were using blankets to protect the external components from the heat that is generated from the DPF during regen. We would/will also wrap the Turbo to prevent the turbo heat from damaging surrounding areas but this can lead to turbo damage from heat. Thus we used water cooled turbos and blankets on them when needed. I do know that they are looking at adding a fan system to run under the hood to cool the engine area. This would run on a timer/ temperature probe and would be required to reach a certain temp before shut down or timed event.

This could be what you are seeing on the aftertreament for emission control equipment.

 

[Trashdawg]

Wraping the exhasut is a great idea, If Dodge could design the truck around the dpf it would be located a lot closer to the motor.

 

[pcarlson]

The pictures are of the test blankets. When mine are done and mailed out I will take some picture of the product and installation.



Bob mentioned another alternative with using a wrap material and he has his own real world test data to support it's use. I decided on the blanket over wrap for my application because I believed that it would be quicker to remove if I had to remove it for whatever reason.



I will keep the group posted as I go. I will be gone for three weeks so it might be awhile before I get it installed.

 

[Bob4x4]

a better solution is to delete the egr and do a 5" turbo back with a donoldson muffler that way wiith the dpf in the scrap pile temp not a problem and 20% better mpg is not bad ether

That is very easy to say since you are driving an 06 :-laf and since the 50 state emmisions test program has not been launched yet.

It is comming and hopefully it will not be too intrussive. My guess is it will include a visual that many trucks will fail on before it gets any further.

 

[pcarlson]

I just got back in town and I installed my exhaust wrap this morning. I will log the current mileage and see what my success is with this as time goes on, but I do not expect any issues. Fit and finish was just like the photos at the top of the post and was not hard to install. If anyone else is interested in this venture just call Tim at ATP.