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Yvon, I don't know the minimum, but I used to have the same problem. I
would have to drain 1/2 cup of crankcase oil after about 10 hours of flight.
So I started reducing the amount of 2 cycle oil. I have flow for the last
three years mixing 3/4 oz of 2-cycle oil to one gallon (US) of fuel with no
apparent ill effects on the engine and I am no longer accumulating 2 cycle
oil in the oil pan.
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
http://www.andersonee.com
http://www.dmack.net/mazda/index.html
http://www.flyrotary.com/
http://members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.rotaryaviation.com/Rotorhead%20Truth.htm
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Yvon Cournoyer
Sent: Friday, July 03, 2009 11:29 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] INJECTION OIL IN FUEL
My engine is a 1986 13B with 88 hrs since remanufacture.
I fly a Zenair Zenith with a cogbelt PSRU and a Warp Drive 3-blades prop
and this engine never runs above 5700 rpm
When I installed this engine in my Zenith I removed the metering oil
pump and have been using two stroke injection oil mixed in the
automobile fuel ( 87 octane gasoline)
At first I used a volume mix of 128:1 gas to oil and soon noticed an
increase of engine lubricating oil volume in the oil pan
I have gradually reduced the volume mix of gas to oil to 140:1 but there
is still a slight increase of engine lubricating oil in the pan.
Also a local mechanic has mentionned that the two stroke injection oil
is degrading the 20W-50 engine oil.
How much can I reduce the volume mix of gas to oil ?
Please advise
Yvon
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