Today's Message Index:
----------------------
1. 12:20 PM - Rotax 912 oil analysis (Paul Kuntz)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Rotax 912 oil analysis |
I tried to post this previously, but I'm not sure it appeared on the list.
I'd be interested in your thoughts on oil analysis trends for my Rotax 912
UL. The engine has been operating for four years, with 410 Hobbs hours to
date. The aircraft is a Pipistrel Sinus motorglider with a Pipistrel
controllable pitch and feathering propeller. Most of the time I use
ethanol-free mogas, but avgas on occasion. I have been changing oil and
filter at roughly 50 hour intervals, and began sending oil samples in for
analysis at 285 hours. I'm using AeroShell Sport Plus 4 oil and Rotax oil
filters. I'm using Aviation Laboratories (AvLab) for this service.
The iron content values are of some concern. AvLab reports metal content
in parts per million, with values for my engine accompanied by what they
say are average values for the same engine model with similar operating
hours. For my engine, the iron content over the 125 hours since I began
sending in samples has risen from 51 to 76 to 117 ppm, versus average iron
values for this engine model of 21 to 27 ppm. I always check the magnetic
plug and the oil filter element at each oil change, and have never detected
any metal on either the magnetic plug or in the filter element.
The other metal components AvLab measures (copper, nickel, chromium,
aluminum, lead, silicon and tin) are either below or only somewhat elevated
from their corresponding average values. The elevated values are for
nickel, silicon and chromium, although they are well below the five times
above average value for iron in the latest sample.
What are your thoughts? Should I be concerned?
Regards,
Paul Kuntz
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|