Exhaust condensation

[DeansRedRam]

I've taken notice that on a cold start of my 2018 after sitting about a week, I see steam out the exhaust. I never recall seeing this on my 2001 with a 5.9 diesel. Is there a reason for this out the new truck only?

I'm thinking something with the DPF/DEF or the soot from my 2001 that is all inside the exhaust pipe doesn't let water collect? Just curious

 

[nukegm]

https://www.turbodieselregister.com/threads/emissions-compliant-white-smoke.268176/#post-2615658

comrade - perhaps this thread might help any? good luck. cheers!

 

[DeansRedRam]

Thank you, I did in-fact see that thread.But I was still perplexed as to more so of the reason behind that these new emissions trucks do it and gassers, but the older diesels do not.

 

[Ozymandias]

Thank you, I did in-fact see that thread.But I was still perplexed as to more so of the reason behind that these new emissions trucks do it and gassers, but the older diesels do not.

It's more or less the catalyst that absorbs water, either from the environment of parked for a prolonged period or just after the start of the engine.
Old Diesels don't have that and only smoke white if it is very cold in winter.

 

[EZeis]

The catalyst produces the water vapor.


Earl

 

[Signal73]

Very common, and completely normal. My 2500 does it, along with my large trucks at work.

 

[Newsa]

H20 is a by product of hydrocarbon combustion (both gas and diesel).

The catalyst doesn't produce water. But water can be trapped in the chambers of the DPF and SCR components and condensed after shut down. Water is 66.7% of DEF, so additional water is injected. I am under the impression that the DEF pump doesn't start pumping until the SCR chamber gets hot enough to do it's thing.

I am pretty impressed how resistant the exhaust and treatment system is to corrosion with so many different chemicals being pushed through it. No wonder replacing those exhaust components is so expensive.

 

[Ozymandias]

Actually it's all stainless today, and I mean real stainless not the poor man's stainless.
In the early days of SCR they had huge corrosion problems.

 

[mfurrh55]

H20 is a by product of hydrocarbon combustion (both gas and diesel).

The catalyst doesn't produce water. But water can be trapped in the chambers of the DPF and SCR components and condensed after shut down. Water is 66.7% of DEF, so additional water is injected. I am under the impression that the DEF pump doesn't start pumping until the SCR chamber gets hot enough to do it's thing.

I am pretty impressed how resistant the exhaust and treatment system is to corrosion with so many different chemicals being pushed through it. No wonder replacing those exhaust components is so expensive.

Local muffler shop here said new trucks system was 15- 17k to replace

 

[Ozymandias]

Local muffler shop here said new trucks system was 15- 17k to replace

I just know from home, this number is realistic.

 

[mfurrh55]

I just know from home, this number is realistic.

I'll keep my 07 5.9, i just replaced exhaust from turbo back 5" all the way to muffler, then 4" dual coming out of muffler, aluminized for 268.00 and shipped free

 

[Ozymandias]

I'll keep my 07 5.9, i just replaced exhaust from turbo back 5" all the way to muffler, then 4" dual coming out of muffler, aluminized for 268.00 and shipped free

Yep, only the SCRs (or DEF) are so expensive.
On the positive side- they never need replacement aside from mechanical damage through accident or so.

 

[Regcabguy]

I'll keep my 07 5.9, i just replaced exhaust from turbo back 5" all the way to muffler, then 4" dual coming out of muffler, aluminized for 268.00 and shipped free

My local muffler shop said if my 2007 system goes down that they always have complete stock systems on the back rack. Primal compared to the new ones.

 

[Regcabguy]

I'll keep my 07 5.9, i just replaced exhaust from turbo back 5" all the way to muffler, then 4" dual coming out of muffler, aluminized for 268.00 and shipped free

Hopefully it's not as loud as my buddy's MBRP turboback.