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  #21  
Old 05-14-2012, 05:43 PM
jrs14855 jrs14855 is offline
 
Join Date: Apr 2008
Location: Lake Havasu City AZ
Posts: 2,393
Default leaning

The first fuel injected Aztecs as well as the Twin Commanches fouled the spark plugs badly. I have always leaned the fuel injected Lycs on the ground.
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  #22  
Old 05-14-2012, 11:59 PM
RV10inOz's Avatar
RV10inOz RV10inOz is offline
 
Join Date: May 2008
Location: Brisbane Qld. Aust.
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Quote:
Originally Posted by N427EF View Post
I think we are homing in on the problem.
Your question to OZ tells me that you are cranking with the mixture full rich,
yet a few lines above you correctly describe the cold start procedure as stated by AFP.
4th line from the top

You must have added a step by moving the mixture back to rich prior to cranking. This will most certainly flood your engine.
Your right hand will be on the power Knob (mixture) when the engine fires, advance the mixture knob.
You are correct, the adjustments to the idle mixture is very sensitive and unless you accomplish this task with an engine at operating temperature as described in the AFP manual you'll be chasing that sweet spot, where you get a 50 RPM rise on shut down forever.
As to leaning the mixture to the max with fuel injected engines I can't argue with Walt's real life experiences when looking at engines at overhaul time.
However, the 50 RPM rise you get on shut down is added richness you don't need for taxiing around and at today's fuel prices you might as well lean it to the max, you can't hurt the engine by leaning it on the ground.
While fouling the plugs is indeed a problem of less concern in injected engines, leaning to the max on the ground especially on the way back to the hangar will keep the plugs cleaner and ready for an easy start next time you go flying.
Geeze my work here is done!

We are like a mutual admiration society

RV10CH I will send you a PM with contact details. Maybe we can talk one day. Although as Ernst will tell you.....it could take a few hours!

Cheers!

David Brown


PS the AFP procedure is fine, only slightly differenet to mine. Just worded different and a different measurement method. And if fuel flow for you is taking longer to get the value they talk about, try my method. You may be flooding things. I know I sound like a smart A$$ all the time but really, what I am telling you is the best way, does everything it should, and nothing it shouldn't! :-)

Last edited by RV10inOz : 05-15-2012 at 12:03 AM.
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