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  #31  
Old 06-22-2022, 10:52 AM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
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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
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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

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  #32  
Old 06-22-2022, 11:22 AM
NinerBikes NinerBikes is offline
 
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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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  #33  
Old 06-22-2022, 01:09 PM
DBRuth DBRuth is offline
 
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Location: Cumming,GA
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Default 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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  #34  
Old 06-22-2022, 03:23 PM
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Piper J3 Piper J3 is offline
 
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Quote:
Originally Posted by NinerBikes View Post
What was your IAS and your RPM and how long did you run it at that rpm and altitude?
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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  #35  
Old 06-23-2022, 06:10 AM
bobg56 bobg56 is offline
 
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Location: Peachtree City, GA
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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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  #36  
Old 06-23-2022, 07:35 AM
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rvbuilder2002 rvbuilder2002 is offline
 
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Location: Hubbard Oregon
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Quote:
Originally Posted by bobg56 View Post
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.
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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  #37  
Old 06-23-2022, 10:08 AM
seagull seagull is offline
 
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Location: Highland, CA
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Quote:
Originally Posted by bobg56 View Post
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.
What is your airspeed @ 5400 RPM?
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  #38  
Old 06-24-2022, 06:35 AM
bobg56 bobg56 is offline
 
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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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