Black Sooty Exhaust

I don't understand why the exhaust on my 350is continues to be black and sooty. Was like that when I uncrated it and hasn't improved after 10 hours of operation.

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Permalink Reply by Ralph Powell on September 22, 2020 at 6:48pm

Tom,

Break in period of an engine is complete when the rings seat. You can tell when the rings seat by when the engine stops using oil. On a UL that should be around 10 hours. Until then you will be blowing oil past the rings and out the exhaust. Use the recommended oil and watch your oil level. Your rate of consumption will slow and then drop to an ounce every couple of hours. 

Enjoy flying!

Ralph

N750RP

Permalink Reply by Lynn S. Beckhorn on September 22, 2020 at 7:19pm

I had the same problem with my 260i until I took a trip to high desert Oregon for the full solar eclipse.  After the engine was run hard and hot the black went away and my oil consumption went to almost 0.  Don't be too easy breaking in your engine or the rings will never seat properly.  My A/I is in total agreement with this, run it hard and hot.     Cheers,,,,,,,,,,,,, Lynn N984LD

Permalink Reply by Tom Sullivan on September 22, 2020 at 9:42pm

OK,  thanks guys. Will be running it hard now that it's flying and looking for improvement. 

Permalink Reply by Greg Buckmaster on February 23, 2021 at 7:18am

You might check out a blog myULpower.com.  The article is ‘ Fix the mix’. I’m planning on doing the mod.

Permalink Reply by Tom Sullivan on February 23, 2021 at 9:46pm

Thanks Greg.  Yet another mod to put on my to do list.

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