REFLECTOR:Synthetic Oil

[Larry]

Maybe I missed something is Engines 101 but the sumps of internal 
combustion engines are vented to the atmosphere or to the engine intake 
manifold.  The size of the vent will determine the pressure differential 
but the sump pressure will always be positive to its discharge point.


At 11:04 AM 11/12/03, you wrote:
>Please???
>
>Hey Al, lighten up.  We don't need the smart ASS comments.
>
>Vacuum compared to the front of the airplane.  Some have observed that the 
>manifold pressure drops when the intake air is from INSIDE the cowl.  Just 
>take a look the engine's position compared to a tractor.  The tractor 
>faces the wind and gets close to pitot pressure - at 175 knots this is 
>approximately 20 inches of water PRESSURE.  On the back end of the plane, 
>there would be a opposite pressure (often called VACUUM).  This negative 
>pressure (often called VACUUM) is approximately 20 inches of water.  40 
>inches of water - is approximately 1.5 psi.
>
>It would be awfully nice if folks would engage their brain before putting 
>their mouth in gear!!!!
>
>Ronnie
>----- Original Message -----
>From: <mailto:ALVentures@cox.net>Al Gietzen
>To: <mailto:reflector@tvbf.org>reflector@tvbf.org
>Sent: Wednesday, November 12, 2003 12:26 PM
>Subject: RE: REFLECTOR:Synthetic Oil
>
>   He said some of the problem with oil consumption with our pusher 
> Velocities are that they are running in a vacuum compared to pressure on 
> tractor airplanes
>
>
>
>Oh; please!  Vacuum compared to what?  Isn't the engine breather also in 
>the engine compartment?  And the difference in the cowling pressure 
>between a tractor and a pusher may be all of 0.2 psi.
>
>
>
>Al
>
>