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  #31  
Old 04-18-2022, 09:18 AM
moosepileit moosepileit is offline
 
Join Date: Dec 2010
Location: Louisville, KY
Posts: 805
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$- jets seem to thermostat to run over 212 degrees F/100 C.

Though synthetic- I think it keeps the water content as low as possible.

Someone can correct me, but our oil temp is measured at its coolest point and sees about 35 degrees F rise in circulation.

That gets the water out each pass, and combustion continually adds water vapors.

Not sure if cool oil impacts its short life in aviation, but water during hangar life sounds negative.

If 180 was not "right" why the Vernatherm action there and not 140 or 212?
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  #32  
Old 04-18-2022, 09:51 AM
turbo's Avatar
turbo turbo is offline
 
Join Date: Jan 2007
Location: Stuart, FL /Hartford, CT/Virgin Gorda,BVI
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Default thank you. I believe you are correct

Quote:
Originally Posted by moosepileit View Post
$- jets seem to thermostat to run over 212 degrees F/100 C.

Though synthetic- I think it keeps the water content as low as possible.

Someone can correct me, but our oil temp is measured at its coolest point and sees about 35 degrees F rise in circulation.

That gets the water out each pass, and combustion continually adds water vapors.

Not sure if cool oil impacts its short life in aviation, but water during hangar life sounds negative.

If 180 was not "right" why the Vernatherm action there and not 140 or 212?
thank you I believe you are correct
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  #33  
Old 04-18-2022, 10:03 AM
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Walt Walt is offline
 
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
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Originally Posted byjrs14855 View Post
170 oil temperature is too low. 180 minimum.

Originally posted by Walt:
Where did 180 minimum come from?
165-220 is the recommended range from Lyc.
Some documents even state 140 min for continuous operation.


Just to be clear, I was not implying that 180 isn't a desirable temp, but there's nothing wrong if it's at 165 or 220.
I just don't like it when folks make "factual" statements that 170 is too low and it has to be 180, that implies something is wrong when it's not.
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  #34  
Old 04-18-2022, 10:14 AM
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Walt Walt is offline
 
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Quote:
Originally Posted by moosepileit View Post
$- jets seem to thermostat to run over 212 degrees F/100 C.

Though synthetic- I think it keeps the water content as low as possible.
Turbines don't have an oil sump exposed to combustion gases, water cannot be introduced into the oil system from turbine section like an internal combustion engine.
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Walt Aronow, DFW, TX (52F)

EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 2000+ hrs, New Titan IO-370, Bendix Mags, MTV-9 prop
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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  #35  
Old 04-18-2022, 12:25 PM
jrs14855 jrs14855 is offline
 
Join Date: Apr 2008
Location: Lake Havasu City AZ
Posts: 2,794
Default Pumping the Throttle

Article by Paul Dye July 5, 2017 Kitplanes advocated pumping the throttle is fine as long as the engine is is turning over with the starter.
I agree with this completely. Further there are Lycoming powered airplanes with engines that only have the mechanical primer plumbed to two cylinders. In that case pumping the throttle is more efficient because it provides fuel to all cylinders.
On my carburated 0 320 I prime with the throttle most of the time. I engage the starter with the throttle fully closed. If it doe's not fire on the second blade I quickly push the throttle about 1/4 open and then back to near closed. The engine starts immediately at any ambient temperature above 40 degrees.
DO NOT prime by pumping the throttle before engaging the starter.
Regarding oil temperature, Lycoming says that when the engine will take full throttle without stumbling it is ok for takeoff regardless of oil temperature. In other words Lycoming has no minimum oil temp for takeoff with normally aspirated engines.
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