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Exhaust pipe color

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06 Mar 2020 21:45 #2621 by Matt Gunsch
Replied by Matt Gunsch on topic Exhaust pipe color
Black is too rich, chalky to white is too lean, tan is about right, but since we have air cooled engines, I would run more to the rich side.

A&P, IA, PPSEL
30+ years GA and Warbird Maint
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06 Mar 2020 12:55 #2620 by Jeffrey Tipton
Replied by Jeffrey Tipton on topic Exhaust pipe color
The tan color is indicative of an engine running leaded fuel “Avgas”.

The black sooty deposits are from running auto fuel. Look at the tail pipe of your car.

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06 Mar 2020 07:40 #2619 by Gale York
Exhaust pipe color was created by Gale York
Anyone have opinions about the engine condition that produces a chalky vs black exhaust pipe interior? I seem to remember that
a whitish exhaust pipe (not smoke) suggest good engine condition, but most of us have black. Thoughts?

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