REFLECTOR: Air Filter (was: RAM air and a "cold box" intake), oil analysis
Sid Knox
sbjknox at earthlink.net
Sun Jul 9 12:20:17 CDT 2006
> What is your experience with not having an air filter?
I have no quantative data that I consider meaningful. For a few years I
sent an oil sample to the lab and sometimes the silicon would be near the
recommended limit but sometimes not. The engine (IO-320) and mating Hartzel
constant-speed prop came from a Texas airplane junk yard (one side of a twin
Comanche). The log book indicated about 1600 hours. It sat for about 25
years in a guys garage before I got it. The diaphragms in the Bendix fuel
servo had turned to stone and it would have cost at least $1300 to fix it
(including upgrades). That's when I decided to roll my own.
The engine runs strong, compression in high 70's, burns a quart of oil every
8 hours, and does not leak oil.
I have quit doing the oil analysis because I was never able to gain any
useful insight trying to interpret the nearly random-appearing reported
values of the various contaminants. When I first cranked it up after its
25-year siesta, I ran it for a few hours (not flying yet) and drained the
oil. It (and the filter) was loaded with dirt and carbon but no metal, so I
went ahead with the EFI. After about 10 or so hours, the engine had
cleansed itself and so it remains today. I do cut open the oil filter each
time I change it and so far my junk-yard engine is as clean as my relatively
low-time IO-360 Velocity engine.
Sid Knox
Oklahoma
Velocity N199RS
Starduster N666SK
W7QJQ
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