REFLECTOR: Cold Weather Flying

[David Rene Dugas]

Larry, 
I did not know that. Sooooo 300-400 is ok?  Not desirable but ok?

Rene' Dugas
Sent from an Apple. 

On Dec 21, 2012, at 5:00 PM, "Laurence Coen" <lwcoen at hotmail.com> wrote:

> Most engine applications measure the oil temperature where it enters the engine oil galleys   In other words, after it has gone through the oil cooler.  Oil that is splashed against the bottom of a piston gets much hotter.  Not to worry, petroleum based oil starts to "coke" at temperatures above 608F.  The only place that this is likely to happen is in a turbocharger.
> 
> Larry Coen
> N136LC
> 
> --------------------------------------------------
> From: "John Dibble" <aminetech at bluefrog.com>
> Sent: Friday, December 21, 2012 4:44 PM
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Subject: Re: REFLECTOR: Cold Weather Flying
> 
>> Oops.  I meant 175F.  Thanks for pointing that out, Rene, Scott.
>> 
>> John
>> 
>> On 12/21/2012 4:05 PM, Scott Derrick wrote:
>>> I noticed that too but forgot to say something.  275f is above any red line I've ever seen.  That oil is cooked.
>>> 
>>> David Rene Dugas <renedugas at gmail.com> wrote:
>>> 
>>>> No one else commented so I will. The oil temp seems quite high. Maybe dangerously.
>>>> 
>>>> Rene' Dugas
>>>> Sent from an Apple.
>>>> 
>>>> On Dec 21, 2012, at 10:04 AM, John Dibble <aminetech at bluefrog.com> wrote:
>>>> 
>>>>> Had a good flight from MS to NY on Wednesday.  Stopped at DKX Knoxville for fuel.  That's a hard airport to find hidden in the hills.  A while back I reported that my temps were too low in cold weather and not enought cabin heat.  I decided to go after the source of the heat and reduce the engine cooling air, see pic.  I thought this would be over kill and I would have to trim it a bit, but it turns out that this just gets the engine temps to the bottom of the desired range (250-300F) with an OAT of 40 F.  At 30F CHTs are 240-245F.  Still, the oil temp ran at 275F with the diverter flap fully deployed and that gave too much cabin heat.  During descent for landing, temps got very low and I had no cabin heat.  I would like to have a way to adjust engine cooling air from the cabin, so I can have max cooling for T/O and reduce cooing air at cruise and reduce it further for descent.  Has anyone done this?
>>>>> When the OAT got down to 30F, I decided it would be a good idea to add some carb heat even though my manifold pressure was holding steady.  I did not see an expected increase in the carb temp gauge, but the MP did decrease by a few tenths indicating that the carb heat was working. Guess I need to work more on the the carb temp sensor placement.  I had moved it to the fitting where the manifold pressure line connects (carb outlet).  It seemed to be giving sensible readings at higher OATs, but not at 30 F where it counts. Looking forward to returning to warmer weather after the holidays.
>>>>> 
>>>>> John
>>>>> 
>>>>> 
>>>>> <cooling air scoop.jpg>
>>>>> _______________________________________________
>>>>> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
>>>>> 
>>>>> Visit the gallery!  www.tvbf.org/gallery
>>>>> user:pw = tvbf:jamaicangoose
>>>>> Check new archives: www.tvbf.org/pipermail
>>>>> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
>>>> _______________________________________________
>>>> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
>>>> 
>>>> Visit the gallery!  www.tvbf.org/gallery
>>>> user:pw = tvbf:jamaicangoose
>>>> Check new archives: www.tvbf.org/pipermail
>>>> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
>>> _______________________________________________
>>> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
>>> 
>>> Visit the gallery!  www.tvbf.org/gallery
>>> user:pw = tvbf:jamaicangoose
>>> Check new archives: www.tvbf.org/pipermail
>>> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
>> 
>> 
>> 
>> 
>> _______________________________________________
>> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
>> 
>> Visit the gallery!  www.tvbf.org/gallery
>> user:pw = tvbf:jamaicangoose
>> Check new archives: www.tvbf.org/pipermail
>> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
> _______________________________________________
> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
> 
> Visit the gallery!  www.tvbf.org/gallery
> user:pw = tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail
> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html