Links for each section here isolate discussion items and include links to updated Avweb and GAMI articles that are useful in understanding the topic. The Avweb archive links will require registration on the site.

THE LEAN OF PEAK (LOP) DEBATE

LOP: Differences in recommended procedures for Mooney engines.
Original post: 7/7/1999
Entire thread: TIT Limit on 231 with -LB Engine
By John Eakin, "LOP operation is not new - however it has been pretty much forgotten since flat engines became common because most 'modern' flat engines don't run smoothly LOP ..."
Replies: 24
References:
Avweb.com
"Pelican's Perch #18, Mixture Magic," (John Deakin, June 14, 1999)

More LOP debate
Original post: 3/30/2000
Entire thread: Lean of Peak
By Trey Hughes, "After talking to many engine people (including Lyc., Teledyne and P&W) when operating at Lean Of Peak (even if it's the same absolute temperature i.e.: 1500 degrees) you operate without the added cooling of the excess fuel ..."
By John Eakin, "EGT is only a reference point or datum for controlling CHT. High CHT is what cooks engines and CHT is actually what we are manipulating when we adjust EGT ..."
Replies: 19

GAMIjectors in a 231
Original post: 3/30/2000
Entire thread: GAMIjectors in a 231
By Dave Piehler, "In fact, if you run a lean test as specified by GAMI and send them the data they will tell you if you can run LOP without their product ..."
By JT Small, " I use to run LOP at these lower altitudes, much of the time WOT, but then I lost two cylinders to cracks and generally all exhaust valves were showing signs of heat stress so I stopped that practice ... "
Replies: 33
References:
GAMI Lean Test (May 4, 2005)
GAMI article references.

Avweb.com
"Pelican's Perch #15, Manifold Pressure Sucks," (John Deakin, March 21, 1999)
"Pelican's Perch #16, Those Marvelous Props," (John Deakin, April 19, 1999)

"Pelican's Perch #18, Mixture Magic," (John Deakin, June 14, 1999)

"Pelican's Perch #19, Putting It All Together (engine management techniques)," (John Deakin, June 30, 1999)

All of John Deakin's engine-management columns.

Lycoming Engine Operation Tips
"The New Old Leaning Technique," (Textron Lycoming, 2000)

Lean of peak: mixed results.
Original post: 3/30/2000
Entire thread: GAMIjectors in a 231
By Chris Wilcox, "As for my LOP ops, so far I've met with mixed results ... in the high teens, where every up- and down-draft has resulted in a bootstrapping phenomenon of significant proportions."
By John Breitinger, "We decided early on to run rich of peak. We talked a lot with the guys from Continental, Willmar and several of the big engine shops before deciding to do this ..."
Replies: 37

Lean of peak: Bob Kromer on test results.
Original post: 2/25/2004
Entire thread: GAMIjectors in a 231
By Bob Kromer, "... operating a normally aspirated engine lean of peak will absolutely cause no harm or damage to the engine ... On the other hand, I remain firm in the opinion that running a turbocharged engine lean of peak is like flying to the dark side of the moon. "
Replies: 3

A TLS Bravo pilot gives up on lean of peak
Original post: 11/19/2006
Entire thread: GAMIjectors in a 231
By Don Kaye, "I am done trying to get my TIO540AFIB TLS engine to run LOP. I have literally spent thousands of dollars on this project ..."
Replies: 13

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Revision: 10/28/2010