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Date: Tue, 21 Dec 2004 18:52:41 -0600
From: David Staten <Dastaten@earthlink.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: front cover oil fitting thread?
References: <list-576012@logan.com>
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I think if you actually look at the oil system schematic, you will 
discover that the oil return portion is not under "suction" whatsoever 
but still positively pressurized. I'm not commenting on the diameters of 
the hoses. I'm simply saying the rationale you give doesnt make sense to me.

Dave

Marvin Kaye wrote:

>  "Russell Duffy" <13brv3@bellsouth.net>:
>
> """
>  My current oil system started out as AN12 all the way, but I ended up 
> having
>  to use an AN10 fitting at the engine, so the lines change from AN12 
> to AN10
>  along the way.
> ...snip....
>  Rusty (I know bigger is better, but AN10 is going to have to do)
> """
>
> Here's a data point for you, Rusty.  On the Eagle we use AN8 for the 
> oil presssure lines (between engine and oil coolers) and AN10 for the 
> returns. The pressure side can typically be smaller than the return, 
> something about flow under pressure vs flow under suction.  Ditto for 
> the coolant lines... 1.25ID for pressure, 1.50ID for suction.  I 
> thought you'd be interested.
>
>  <marv>
>  
>
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>>
>