gkainz
Final Approach
What do you think of these tidbits?
PA28-236 Piper Dakota 3400 total hours
Lycoming IO-540 1000 hrs SOH
Mufflers replaced last annual - 360 hrs flown on these. Examination at this year's annual reveals significant distortion and damage to the flame cones on front and middle mufflers, rear muffler appears serviceable.
Operating too lean?
Spark plugs - 360 hrs on these. All 6 lower spark plugs show significant leading. All 12 show significant center electrode deterioration.
Operating too rich?
Compression checks show 1-4 high 70s, while 5, 6 show low 70s.
5 and 6 always indicate they're running cooler via JPI ... I don't recall by how much.
Thoughts?
PA28-236 Piper Dakota 3400 total hours
Lycoming IO-540 1000 hrs SOH
Mufflers replaced last annual - 360 hrs flown on these. Examination at this year's annual reveals significant distortion and damage to the flame cones on front and middle mufflers, rear muffler appears serviceable.
Operating too lean?
Spark plugs - 360 hrs on these. All 6 lower spark plugs show significant leading. All 12 show significant center electrode deterioration.
Operating too rich?
Compression checks show 1-4 high 70s, while 5, 6 show low 70s.
5 and 6 always indicate they're running cooler via JPI ... I don't recall by how much.
Thoughts?