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  #11  
Old 01-17-2013, 06:43 AM
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miyu1975 miyu1975 is offline
 
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Thanks.. will look at mine next time to see what color. I was running rich at first but have gotten much better at leaning, especially leaning on the ground... what is best procedure to clean the exhaust?....ie..what should be used to do so?
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  #12  
Old 01-17-2013, 06:57 AM
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Sam Buchanan Sam Buchanan is offline
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Default auto gas sooty--100LL gray

Running auto gas can produce a sooty black exhaust stack (and spark plugs). The gray residue we see is the result of lead in 100LL.
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  #13  
Old 01-17-2013, 09:05 AM
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longranger longranger is offline
 
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Quote:
Originally Posted by miyu1975 View Post
Thanks.. will look at mine next time to see what color. I was running rich at first but have gotten much better at leaning, especially leaning on the ground... what is best procedure to clean the exhaust?....ie..what should be used to do so?
Just run the engine in a properly leaned conditon; it'll clean itself (at least my O-300 does).



Quote:
Originally Posted by Sam Buchanan View Post
Running auto gas can produce a sooty black exhaust stack (and spark plugs). The gray residue we see is the result of lead in 100LL.
Thank you Sam! For years I've thought I'm the only one that's had problems with sooty exahust with mogas. Regardless of how agressively I leaned, the pipes looked like they were attached to a diesel.
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  #14  
Old 01-17-2013, 09:07 AM
swixtt swixtt is offline
 
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Quote:
Originally Posted by Sam Buchanan View Post
Running auto gas can produce a sooty black exhaust stack (and spark plugs). The gray residue we see is the result of lead in 100LL.
that is exactly correct.
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