Joe Hull
Cozy Mk-IV #991 (In Phase1 Flight Test
- 10.9 hrs flown)
Redmond (Seattle),
Washington
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Lehanover@aol.com
Sent: Friday, April 28, 2006 7:54
PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Was Oil
Pressure and Now...
In a message dated 4/28/2006 8:08:03 P.M.
Eastern Daylight Time, russell.duffy@gmail.com writes:
I dropped the pan today and there were a
bunch of gold flakes in the pan. Not a huge amount overall but if I sloshed
things into a corner it looked significant. So, pondering my next step.
Remove the engine and return it to the
builder with all performance data up to the loss of pressure. I would insist on
being present for the disassembly.
I talked to the engine builder for a
National championship car about why they oiled both ends of the crank. They had
lost the front rotor bearing on several occasions. They found a coaxial sleeve
to fit over the crank nose, and ran the engine on the dyno at full power. The
oil pressure in the crank with the oil pressure gage reading 75 pounds, was 5
pounds.
So they began oiling the front main
bearing with its own hose. Also jacked up the oil pressure to 100 PSI. It is
probable that many builders found this same piece of data over the years.
When oil pressure drops below 50 pounds,
what is the pressure in the crank, and how much do you get back from the
centrifugal load on the oil column?
Once the engine is showing metal it has
to come out. I would expect a free rebuild with so few hours.