MrNomad
Well Known Member
I now have 45 hours on my Superior A1A1 carbed O-360 engine in my 9A. Performance and reliability has been excellent. I asked Superior for their official recommendations concerning leaning. Pls read their comments.
Barry
Tucson
Hello Barry,
Glad that you are enjoying your new engine!
Here's the official Superior recommendations with regards to leaning:
At 100% power stay full rich at sea level and for higher altitudes lean until the engine just smoothes out. This will put you somewhere between 100 degrees and 200 degrees Rich of peak EGT. You will need to experiment a bit with your engine to find the exact point on your EGT gauge. You need that extra fuel to keep cylinder head temperatures down at higher power settings for a long engine life, fuel is cheaper than cylinders.
At 75% cruise power setting you can safely run anywhere from 25 degrees lean of peak to 50 degrees rich of peak. If the longest possible engine life is your goal, stay on the rich side of peak.
At 65% and below you can run pretty much lean as you like without fear of damage to the engine. Leaning beyond peak EGT at lower power settings will actually drop cylinder head temperature with a nice drop in specific fuel consumption to go along with it.
Use of AutoGAS will not change leaning recommendations but can effect sensitivity of the EGT instrument as you lean.
Hope this helps,
John Weber
Superior Customer Support
Barry
Tucson
Hello Barry,
Glad that you are enjoying your new engine!
Here's the official Superior recommendations with regards to leaning:
At 100% power stay full rich at sea level and for higher altitudes lean until the engine just smoothes out. This will put you somewhere between 100 degrees and 200 degrees Rich of peak EGT. You will need to experiment a bit with your engine to find the exact point on your EGT gauge. You need that extra fuel to keep cylinder head temperatures down at higher power settings for a long engine life, fuel is cheaper than cylinders.
At 75% cruise power setting you can safely run anywhere from 25 degrees lean of peak to 50 degrees rich of peak. If the longest possible engine life is your goal, stay on the rich side of peak.
At 65% and below you can run pretty much lean as you like without fear of damage to the engine. Leaning beyond peak EGT at lower power settings will actually drop cylinder head temperature with a nice drop in specific fuel consumption to go along with it.
Use of AutoGAS will not change leaning recommendations but can effect sensitivity of the EGT instrument as you lean.
Hope this helps,
John Weber
Superior Customer Support