[SPAM] Re: RE: OS mixture question

[DaveL322 at comcast.net]

Good setups I've seen typically go at least 100 flights (assuming about 10 minute flights) before needing a plug change.  My EFIs were good for 300 flights easy.

I usually change plugs because the element becomes gray in color and have small amounts of crystallization "growing" on the element - signs the platinum is used up.  If the element is distorted, it means the mixture is not correct (pushed in is lean, drawn out is rich) or debris has gone through the engine.

Dave

-------------- Original message -------------- 

Hi Jim,

I run about 3 clicks rich from peak RPM, with a good smoke trail from tick-over up to WOT. Both engines have newish rear bearings (below 50 flights). At around 25-30 flights on the plugs they start to falter lean on inverted pull ups, going to WOT. Usually changing the rear plug (which runs hotter) will cure it, sometimes it needs both. I have tried OS8s and A5s on the back, but have found the OSFs to be better on both. 
What do people see as an acceptable average plug life for the OS140? After my experience with a certain Italian motor, I thought 30 flights was PDG!! :-)
No offense Lance . . .!!!!
I seem remeber the OS140 manual says "treat glo plugs as expendible items and be prepared to change them when necessary", or words to that effect. In other words always keep a pair handy!!

Rodney


Jim_Woodward at beaerospace.com wrote:

Hi Rodney, 

Why are you changing plugs every 30 flights?  That get pretty expensive in the long run.  Is the engine running lean?  I've seen a few other using the 3M head and OSF plugs, and not having to change so often. 

Cameron, how often are you changing plugs? 

Thanks, 
Jim W. 


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