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From: "Bill Bradburry" <bbradburry@bellsouth.net>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
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Subject: RE: [FlyRotary] Re: Emailing: rotor 2 leading, rotor 2 leading b
Date: Tue, 7 Jul 2009 18:22:21 -0400
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Steve,
I hope Lynn chimes in here.  He has seen a lot of plugs under a lot of
conditions.  They look pitted to me.  There seems nothing wrong with your
conditions.  The only thing on the list would be too lean.??
Someone is out there writing up a great response right now!  :>)
Bill B 

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of sboese
Sent: Tuesday, July 07, 2009 6:05 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Emailing: rotor 2 leading, rotor 2 leading b

Bill,

The engine is normally aspirated.  Very little time was spent at more than
23 inches of manifold pressure with the majority of it at 21 inches or less.
My home field density altitude is almost always 7500 ft or higher.

The fuel used was about equal amounts of either 87 octane Mogas or 100LL.

Static timing was set up as in the EC2 manual.

Operation was at either max power mixture setting (ROP EGT) for take off and
climb or about 60 degrees LOP EGT for cruise.

Do any of the above conditions seem unreasonable?

The appearance in the pictures is what I have normally seen at less than 20
hours of plug operation in the 130 hours the plane has been flying.

Steve Boese

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Bill Bradburry
Sent: Tuesday, July 07, 2009 3:43 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Emailing: rotor 2 leading, rotor 2 leading b

Steve,
You did that in only 15 hours!?
Those plugs look like they were too lean.  They are pitted and the electrode
is pitted as well. On the NGK site

.Over-advanced ignition timing
.Fuel octane rating too low (knock is present) .Excessively lean air-fuel
mixture How much boost are you running?

Bill B

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of sboese
Sent: Tuesday, July 07, 2009 5:05 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Emailing: rotor 2 leading, rotor 2 leading b

Ed,

Here are two pictures of a plug removed after 15 hours of use, half with
100LL.  All the plugs look very similar.  Does this plug look typical to you
and satisfy your definition of "no discernable wear"?  I'm just trying to
satisfy myself that I'm not seeing something anomolous.

Steve Boese


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