Doesn’t this depend on the filter
brand?
Mark S.
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of David Staten
Sent: Wednesday, April 20, 2005
9:21 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: stock 3rd
gen oil filter- bypass valve?
Al Gietzen wrote:
The question was
- Does the stock 3rd gen filter have a bypass? I'm guessing it
does.
Rusty
I’m not sure why it would –
it is not a full flow filter. The filter block is ported so some oil goes
through the filter to the engine, and some bypasses to the pressure control
valve – back to the pan.
Al
I disagree.. but I don't know the answer for sure. What I do know is that if
the filter plugs up under the situation you are describing, oil flow to the
engine (through the filter) would be nil.. Because the ONLY path for oil into
the engine from the stock rear-iron pedestal is THROUGH the filter assembly
(out the pedestal to the filter, then back into the pedestal to the interior of
the engine). I've proven this conclusively with my multiple cores... But
you would still get an adequate oil pressure reading because the oil pressure
transducer gets it's feed off the path to the pressure regulator, which
originates "before" the filter in the plumbing scheme.
That is an unacceptable possibility that would destroy the engine for want of a
"cheap" oil filter. Having a filter with an internal bypass provides
that protection to the engine.. dirty lubrication is usually a mite or two
better than no lubrication at all. I should have cut open one of my used
filters on the set of 3 engines when I disassembled them.. but never thought
about it then.. and I've since cleaned out the "factory" er.. garage.
Dave