Turbo oil supplies have a limiting orfice like a pressure sensor to limit loss of oil due to a shaft break. And they would foul on the total amount pumped at normal oil pressure. The oil scavenge pump or check valve on the return is also important.
Marc Wiese
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> From: "Russell Duffy" <13brv3@bellsouth.net>
> Date: 2005/06/01 Wed AM 12:50:39 EDT
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: Turbo install: Solenoid valve order, new prop.
>
> I must not understand something, why are you putting a solenoid on the
> turbo feed line? It seems like a good way to ruin a turbo.
> Tim Andres
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>  
> There are some turbo failure modes that damage the oil seal in the turbo.
> Even if the turbo freezes solid, you can still continue with partial power,
> and possibly no real damage to the engine, so long as you don't allow all
> your oil to be pumped overboard through the damage turbo oil seal.  The only
> time you would close the valve is if you start blowing smoke, and you figure
> the turbo is a goner at that point anyway.  
>  
> Cheers,
> Rusty (kicked the turbo habit)  
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