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Engine Smoke Question  
User currently offlineDeltaJet757 From United States of America, joined Sep 2006, 243 posts, RR: 0
Posted (9 years 1 week 1 day 19 hours ago) and read 2009 times:

I was browsing through a bunch of NW 744 pics and videos recently and as I was watching a video of a NW 744 taking off to NRT from DTW I saw a lot of black smoke coming out of it's engines.


Is it common for the PW4000 engines to do that or are they in need of a coke wash? Perhaps both?

I also came upon a photo of a UA 744 departing SYD with a little bit of smoke noticably coming off engines 3 & 4 (1 & 2 if you look closely enough)

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Photo © Jackson Qiu


3 replies: All unread, jump to last
User currently offlineRandyWaldron From United States of America, joined Mar 2006, 324 posts, RR: 3
Reply 1, posted (9 years 1 week 1 day 17 hours ago) and read 1957 times:

Quoting DeltaJet757 (Thread starter):
I saw a lot of black smoke coming out of it's engines.

It's all about perception. Yes, you observed exhaust gases, but there is nothing overly exciting about them. Current weather conditions also contribute to the appearance of exhaust gases...No, the engines are not in need of a washup, and no, that was not "a lot" of black smoke.

[Edited 2007-02-05 08:16:15]

"Flaps 20, gear down, landing checklist please..."
User currently offlineDeltaJet757 From United States of America, joined Sep 2006, 243 posts, RR: 0
Reply 2, posted (9 years 1 week 22 hours ago) and read 1780 times:

Really? I never would have thought of that.


User currently offlineEMBQA From United States of America, joined Oct 2003, 9403 posts, RR: 10
Reply 3, posted (9 years 1 week 22 hours ago) and read 1770 times:

ALL engines smoke.... some more then others. It is most notiable during take off as the engine is under its biggest load. 'Coke washing' will do nothing for a smokey engine. Coke washing is done only to remove build up of material... most likely carbons...from inside the engine. It is also done rarely as it will reduce the life of the engine. Compressor washes are more common and done on a schedules basis. Compressor washing is the application of a water based 'degreaser' to the internals of the engine. It helps remove the build ups from inside the engine, but is far less agressive then coke cleaning.

If you want to see smokey engines, just look at some of the pices from the 1960's...!!

[Edited 2007-02-06 04:00:49]

"It's not the size of the dog in the fight, but the size of the fight in the dog"
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