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Date: Wed, 12 Sep 2007 23:21:53 -0400
From: John Slade <sladerj@sbcglobal.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: How cool is too cool?
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Hmmm. Maybe that's why I've been having small oil leaks all this time. 
You mean you're not supposed to vent the turbo wastegate into the oil 
breather ????    :)

Ernest Christley wrote:
> John Slade wrote:
>> >>I'd heard oil needs to see 212f minimum at some point so that it 
>> can boil off moisture that develops.
>> >Actually, at 6000 feet, where a lot of folks fly, the boiling point 
>> drops
>> >to 201F.  At 10K feet, it is only 192. Perhaps thats true at ambient 
>> pressure, but surely - not at 80 PSI. :)
>> John
>>
>
> Dude, if the oil in your sump is at 80psi, something is either broken 
> or soon will be. 8*)
>
> My understanding is that oil is constantly pickup up water from 
> combustion byproducts.  The desired running temperature is set such 
> that the water is boiled off at least as fast as it's coming in.  An 
> engine with good compression will have less blow-by and can get by 
> with lower temps.  The smoky contraption that Detroit was turning out 
> in the 70's, with gaps in the seal that you could read through, needs 
> an extra flame to heat the oil just to keep up.  (Yes, I exaggerate).
>
> I would think that we could run a little cooler in airplanes without 
> issue, because we don't have to burn off the extra water that has 
> built up from short drives where the oil barely got warm.
>
> -- 
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