REFLECTOR: Blow by

[Stockman, Bill]

I've got over 800 hours on my current IO-360C1C with good compressions.   I also  have dual oil coolers in the nose.     I normally keep my oil at the 5.5 to 6 qt point on the stick.   Anything above 6 seems to magically depart the aircraft after an hour or so.    
Many years ago on my first long cross country, I was a little nervous so filled it up to the 8 quart point on the stick.      4.5 hours later it was down to around 6.   I was concerned that I was burning oil.    Everyone said don't worry.   On the way back I took off
at 6 quarts and 4.5 hrs later it was still at about 6 quarts.       As you probably already know, our systems carry a lot more oil than the six quarts indicated by the stick.
________________________________________
From: reflector-bounces at tvbf.org [reflector-bounces at tvbf.org] On Behalf Of Lou Stedman [stedmanlou at roadrunner.com]
Sent: Saturday, March 10, 2012 12:01 PM
To: Velocity Reflector; Canard Aviators
Subject: REFLECTOR: Blow by

Last week we were discussing the amount of oil different engines burn in a given time. I mentioned that I do not fill up my crankcase because the first quart will blow out within an hour if I do that . However if I fill to six quarts I don’t go through another quart for about four to five hours. After that I got a note from someone that I should not do as I described as it is a indication that there is a blow by problem with my engine (Lyc IO-360). If this is true, what is the cause of blow by?

Lou Stedman
Velocity SEFG
N7044Q
Olean, NY