REFLECTOR: Blow by

[David Rene Dugas]

My IO 540 does the same at 8.5 quarts it burns almost no oil but if I fill above 9 qts it blows out in 30 min of flight.  I don't know this but I always thought it was from standard blow-by forcing many more and bigger droplets out because of climb and descent causing the oil to slosh and stay either forward or aft and the oil is now being struck by the crank as it turns throwing large drops around and some go out the breather instead of a faint mist it is like a storm.  I get very little actual negative G flight experiences but with our plane the angle of the engine is fairly dramatic in climbs and descents.  I don't have an engine to test this but sure would like to hear from someone who tilts and engine 15 degrees up or down and see where the oil strikes the internal rotating parts.
I may be way off and I'll probably be bashed but seems reasonable.
Rene'

On Mar 10, 2012, at 11:01 AM, Lou Stedman wrote:

> 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
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