Ernest,

I chose to keep the oil injection system.  That system has a clean air line from the atmospheric side of the throttle body to the injection ports.  With prolonged operation at or near WOT, injection oil would work its way back up that line to the throttle body inlet.  A check valve was needed to prevent this from happening.  At or near WOT it appears that although the average pressure at the oil injection port may be slightly less than atmospheric, the dynamic nature of that pressure may prevent that port location from being very effective at scavenging.  For what it is worth, that’s what happened with my installation. 

Steve Boese

RV6A 1986 13B NA RD1A EC2

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ernest Christley
Sent: Thursday, March 10, 2011 8:36 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Crankcase ventilation

I've not provided for clean way to vent the crankcase, yet.  And I'm also not going to use the oil injection ports.  As

I understand it, the injection ports should always be at a negative pressure.  Would it be a crazy idea to have the

ports pull the dirty air out of the crankcase and not spread it across my airplane's belly?

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