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06-22-2022, 10:52 AM
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Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,735
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As promised... I flew today to test oil temp with ground temp at 90F. Per post #24 I modified lower cowling to move oil cooler 1" forward of the muffler.
Today's Flight: 80 F OAT, 222 F Oil Temp, 50 PSIG Oil Pressure.
Looks like I'm good for summer ops in northern OH... 
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 780
LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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06-22-2022, 11:22 AM
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Join Date: Dec 2018
Location: Granada Hills
Posts: 1,257
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What was your IAS and your RPM and how long did you run it at that rpm and altitude?
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VAF dues paid 2022
RV-12, KWHP based
"Time to Spare, go by Air."
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06-22-2022, 01:09 PM
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Join Date: Nov 2013
Location: Cumming,GA
Posts: 115
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Oil temperature
Jim, I'm glad you got the oil temperature back in the normal ops zone. I was starting to think my old muffler was most of the problem. The temps you saw were very much what I had with that exhaust system. I didn't want to modify the cowl , for only a little temperature relief, so I replaced with the new (2016) setup. I flew over the weekend,with ground temps in the mid 90's and never got over 220*.
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N412DR
Kit 120797
First flight 8/21/15 what an awesome aircraft!
HOBBS @380
Dues paid 2021
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06-22-2022, 03:23 PM
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Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,735
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Quote:
Originally Posted by NinerBikes
What was your IAS and your RPM and how long did you run it at that rpm and altitude?
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115 KIAS
5500 RPM
45 Minutes Cruise @ 2500 MSL
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Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 780
LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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06-23-2022, 06:10 AM
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Join Date: Nov 2018
Location: Peachtree City, GA
Posts: 234
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I did a few things that lowered my oil temp, I sprayed mineral spirits through the cooling fins of my oil cooler then blew it dry, also the replacement of the oil return line with the TS Flight line version (banjo fitting). I'm in SC and have been flying 1500' agl 95f at 5400...oil temps between 219-222F...I used to see 230-235F...I'm not sure which had the greater effect, washing the oil cooler or the new oil line. I did re pitch my prop to 71.4 from 71.
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06-23-2022, 07:35 AM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,811
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Quote:
Originally Posted by bobg56
I did a few things that lowered my oil temp, I sprayed mineral spirits through the cooling fins of my oil cooler then blew it dry, also the replacement of the oil return line with the TS Flight line version (banjo fitting). I'm in SC and have been flying 1500' agl 95f at 5400...oil temps between 219-222F...I used to see 230-235F...I'm not sure which had the greater effect, washing the oil cooler or the new oil line. I did re pitch my prop to 71.4 from 71.
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An over pitched prop can definitely cause elevated oil temps.
I am doubtful that either of the other things had any influence on oil temp.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Hubbard, Oregon
Van's Aircraft Engineering Prototype Shop
FAA/DAR
RV-6A (aka "Junkyard Special ")
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06-23-2022, 10:08 AM
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Join Date: Dec 2019
Location: Highland, CA
Posts: 494
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Quote:
Originally Posted by bobg56
I did a few things that lowered my oil temp, I sprayed mineral spirits through the cooling fins of my oil cooler then blew it dry, also the replacement of the oil return line with the TS Flight line version (banjo fitting). I'm in SC and have been flying 1500' agl 95f at 5400...oil temps between 219-222F...I used to see 230-235F...I'm not sure which had the greater effect, washing the oil cooler or the new oil line. I did re pitch my prop to 71.4 from 71.
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What is your airspeed @ 5400 RPM?
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Live as if you were to die tomorrow. Learn as if you were to live forever.
-- Walt --
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06-24-2022, 06:35 AM
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Join Date: Nov 2018
Location: Peachtree City, GA
Posts: 234
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About 110 KIAS @5400...replacing the oil return line created some needed space from the muffler, old line had about 1/8" clearance
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