Mailing List flyrotary@lancaironline.net Message #43351
From: <wrjjrs@aol.com>
Subject: Re: [FlyRotary] Re: Running lean of peak
Date: Fri, 27 Jun 2008 12:17:34 -0400
To: <flyrotary@lancaironline.net>
Al, something else to think about. If you run lean mixtures is you may want to run the widest plug gap you can easily fire. The reason is that when doing lean operation studies engine manufacturers have found that a strong spark and wide gap is best to reliably ignite lean mixtures. Regular piston engines won't run as lean as a rotary, and they still run very large gaps. Ford has used hot coils and a .060-.070 gap. (It looks huge) Just an FYI.
Bill Jepson


-----Original Message-----
From: Kelly Troyer <keltro@att.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, 26 Jun 2008 8:14 pm
Subject: [FlyRotary] Re: Running lean of peak

  What plugs are you using currently Al ??..............Might be worth a new set
of plugs and a test flight before your trip to see if you get the same symptoms
when leaning........Even though I have heard of leaning up to 200 LOP I do
believe 100 to 150 LOP is a more practical range......... 
--
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold



 
-------------- Original message from "Al Gietzen" <ALVentures@cox.net>: --------------

 
Al,
 How many hours are on your sparkplugs and are you useing auto fuel or 100LL.........Something to
consider before a 2000 mile trip.........Could be possible indication before the dreaded "SAG"..........
 
I don’t recall (have to check the engine log), but I’d guess maybe 20 hrs; only 10 ga 100LL; all the rest unleaded mogas.  I took a leading and trailing out yesterday to look at them and they look fine.
 
Al
 
-------------- Original message from "Al Gietzen" <ALVentures@cox.net>: --------------
I’m finding that at about 100F LOP I sense that the engine is starting to not like it – like it doesn’t seem to be entirely smooth; maybe an occasional miss here and there.  Am I right that some of you guys run as much as 200 LOP; or is it my imagination – in both cases.
 
Would timing setting have much of anything to do with running LOP?
 
Just past by the 100 hr mark on the engine near the end of a 500 mile trip on Monday.  I plan to leave next Monday on a round trip of over 2000 nm over the following week.  That’ll rack up a few hours.
 
Al
Subscribe (FEED) Subscribe (DIGEST) Subscribe (INDEX) Unsubscribe Mail to Listmaster