Still waiting the Blackstone results for this change but wanted to share my results and get some feedback...
RV-9A
O-320-E2D
No air-oil separator on breather
20W-50XC
~30 hours on oil
Used about 1qt in that 30 hours with level kept at 6-6.5 qts.
Prior analysis showed "upper end" (Blackstone comment) corrosion which coincides with limited use while the aircraft sat for sale with limited flying last year. Jug was pulled during pre-buy to look at cam and tappets, which were normal.
I flew aircraft for 45 mins and drained oil. This was an easier than expected, but a little messy pulling screen.
Here's what I observed...
Here's some picts filter inspection process and magnet...I want to get some opinions...Tim
RV-9A
O-320-E2D
No air-oil separator on breather
20W-50XC
~30 hours on oil
Used about 1qt in that 30 hours with level kept at 6-6.5 qts.
Prior analysis showed "upper end" (Blackstone comment) corrosion which coincides with limited use while the aircraft sat for sale with limited flying last year. Jug was pulled during pre-buy to look at cam and tappets, which were normal.
I flew aircraft for 45 mins and drained oil. This was an easier than expected, but a little messy pulling screen.
Here's what I observed...
- Oil was remarkibly clean looking for 30 hours. With the limited burn I would guess this means the upper end is runing tight with limited blow-by.
- Screen caught a small amount of carbon and what seemed to been some old rubber gasket/seal material. Total...it was an immeasurable amount with no metal
- Oil filter - Filter media inspected and run over with strong magnet, no metal found
- Oil filter media washed with mineral spirts and fluid was strained in coffee filter, no metal, and only few small specks of carbon found
- Strong magnet was placed in jar while washing filter media to pick up anything ferrous. Only a very small amount of ferrous material was found (see picture).
- The ferrous material collected by the magnet was very fine...like dust, but there was a couple small flecks of metal < 0.5 mm wide and very thin.
Here's some picts filter inspection process and magnet...I want to get some opinions...Tim
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