humptybump
Well Known Member
Over the past year I've felt my O320-E2A (150hp) hasn't been performing optimally. It has 450 hours since a major overhaul when it was install circa 2007.
Initially it was mostly a feeling. Recently I needed to test my current Catto propeller against my old Aymar Demuth (here after as AD).
In 2012, I did RPM tests of static and WOT@8000' DA:
Now in 2016 I've conducted multiple RPM tests of static and WOT@8000' DA on different days:
Also in 2016 I did a couple of static tests immediately after landing and would see a static RPM close to 2012 number but wishing 2-3 seconds it would drop back to 2016 numbers.
I'm looking for thing to examine and test. The A&P I work with is investigatng this issue with me.
Thus far I have checked:
Initially it was mostly a feeling. Recently I needed to test my current Catto propeller against my old Aymar Demuth (here after as AD).
In 2012, I did RPM tests of static and WOT@8000' DA:
AD: 2300 and 2725
Catto: 2025 and 2750
Catto: 2025 and 2750
Now in 2016 I've conducted multiple RPM tests of static and WOT@8000' DA on different days:
AD: 2260 and 2720
Catto: 1985 and 2740
Catto: 1985 and 2740
Also in 2016 I did a couple of static tests immediately after landing and would see a static RPM close to 2012 number but wishing 2-3 seconds it would drop back to 2016 numbers.
I'm looking for thing to examine and test. The A&P I work with is investigatng this issue with me.
Thus far I have checked:
- throttle linkage for binding and full travel - no performance changes
- air filter was cleaned and then replace - no performance changes
- MAG checks are consistent over the past 4 years
- fuel burn on XC flights appears to be unchanged (but could be up a tenth or so)