White ring around exhaust

[llebhsoj]

I don’t think this white ring has always been there. It looks like the metal is getting thin too. There’s a picture of my get/Cht in cruise. Any ideas?

[ArtVandelay]

It may be leaking through the crack, which needs to be fixed before it starts migrating.

[aaronk25]

The stain looks like lead from the exhaust similar to what you see inside the pipe. It just sucks around the end of the pipe in flight due to the exhaust shape creating a little low pressure zone behind the pipe. That’s my take on it anyway.


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[EricJ]

Your airplane may have a cocaine problem.

Otherwise, fix the crack. 

 

[llebhsoj]

So far I like Eric j’s explanation the best. 

[Cruiser]

If you run extremely rich mixture the unburned fuel will leave a black soot residue.

Running less rich to very lean burns all the fuel and only leaves the inorganic ash. That plus the excess lead and some burned oil will show as a light grayish, white residue on the exhaust pipe. Same with your spark plugs. 

Grayish white is better 

[MBDiagMan]

In the old days, yes, I am plenty old enough to have experienced them, before catalytic converters, us car guys worked toward getting our exhaust pipes to look like that.  That color means proper mixture, and no significant oil burning.  Be happy.

[Rmag]

On 4/3/2018 at 10:21 AM, EricJ said:

Your airplane may have a cocaine problem.

Otherwise, fix the crack. 

 

Isn’t a crack problem technically a cocaine problem?

[RobertGary1]

On 4/8/2018 at 7:00 AM, Rmag said:

Isn’t a crack problem technically a cocaine problem?

Who are you who is so wise in the ways of the world of the simulating pasttimes?

 

-Robert