jetcareers - View Single Post

kellwolf · June 23rd, 2005, 18:55

[ QUOTE ]
more often thatn not, especially in a rental, you have a bit of oil in the cylinder, and the plug isn't hot enough (or more often isn't firing often enough because someone is trying to taxi around at 400RPM, when they should be up around 800-1000+) so it hardens and coats part of the plug.

[/ QUOTE ]

Add the low RPM with people that don't lean the mixture for taxi, and it's a textbook plug fouling situation. I actually have a "Spark plug cleaning" checklist with my Seminole stuff for this since I guess a lot of the time builders here tend to run full rich 24/7. Density altitude here is more or less above 3,000 on the ground from like 9 AM to 8 PM, so not leaning does a number on the plugs. I'd just never heard of using carb heat to help clean the plugs before.....

June 23rd, 2005, 18:55	#12
kellwolf Old Skool Join Date: Jun 2003 Location: Memphis, TN Posts: 14,337	Re: Fouled spark plugs? [ QUOTE ] more often thatn not, especially in a rental, you have a bit of oil in the cylinder, and the plug isn't hot enough (or more often isn't firing often enough because someone is trying to taxi around at 400RPM, when they should be up around 800-1000+) so it hardens and coats part of the plug. [/ QUOTE ] Add the low RPM with people that don't lean the mixture for taxi, and it's a textbook plug fouling situation. I actually have a "Spark plug cleaning" checklist with my Seminole stuff for this since I guess a lot of the time builders here tend to run full rich 24/7. Density altitude here is more or less above 3,000 on the ground from like 9 AM to 8 PM, so not leaning does a number on the plugs. I'd just never heard of using carb heat to help clean the plugs before.....