A lot has been written about GAMI injectors but they are far from required for LoP operation.  I had a Lyc IO360 by Aero Sport Power, Kamloops BC  in my GlaStar and ran the GAMI fuel burn test.  The fuel flows were beautifully balanced and I ran LoP just fine. The plugs were clean at every check and I had 500 hrs on it when I sold it.  Changed the plugs once.  Saved 1.5 gph as I recall.

After break-in of my Cont. TSIO550 by Performance (yes, THAT Performance) I ran the same burn test and lo and behold it too had great balance.  All cylinders peaked at about the same time although at different temperatures.  I cruise it TIT 1550-1600, EGT 100F LoP 17.3 gph set at 2500rpm and 32”.  Plugs are clean and the engine runs smoothly.  

Aircraft have run LoP for decades without GAMI injectors, so test the engine before you hurry to pay the cost.

Robert M. Simon
ES-P N301ES

From: Danny Miller [mailto:danny.miller@verizon.net]
Subject: RE: How do I run lean of peak?
Gary, et.al,
I certainly can’t speak to what others are getting but I have GAMI injectors and my engine has been flow balanced.