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From: <cardmarc@charter.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] turbo oil drain
Date: Tue, 14 Jun 2005 10:04:50 -0400
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All turbo oil drains must go downhill (good to also have a check valve), and return oil must enter oil pan above the level of the oil------if you can't mount the turbo high enough for this you must have a scavenge pump.
Marc Wiese
> From: "Russell Duffy" <13brv3@bellsouth.net>
> Date: 2005/06/13 Mon PM 10:51:14 EDT
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] turbo oil drain
> 
> Let me start this message by saying- shut up John :-)
>  
> Now that that's out of the way, my little brain is concocting another turbo
> scheme for the RV-3.  It seems that I have an almost perfect place to put a
> turbo now, which is right at the cowl exit.  The only problem I see is the
> oil return from the turbo.  
>  
> It's my understanding that you can't have any backpressure at all on the
> return.  Is that true for all turbos, or just some?  In other words, can you
> specify a certain type of bearings and seals that will allow this uphill
> return of oil?  
>  
> I've heard of scavenging pumps to handle the oil return, but in the bit of
> searching I've done, I just can't find anything that appears to be made for
> this.  
>  
> If I could work around this oil return, and hold off long enough for someone
> to find a turbo that works, this could be a sweet deal.  
>  
> Cheers,
> Rusty (OK, John,  go ahead and say it)
> 
>