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  #1  
Old 05-18-2023, 06:07 PM
Jcurry Jcurry is offline
 
Join Date: Jul 2021
Location: Cocoa,Fl
Posts: 169
Default Legacy -12 Oil cooler relocation?

Has anyone moved your oil cooler an inch or so forward on the legacy -12 to gain more exhaust clearance? If so, did it bring the oil temps down? I have been using a titanium wrap with success but it makes a mess. I am aware there is a new style exhaust.
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Titusville, Fl
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  #2  
Old 05-18-2023, 06:24 PM
seagull seagull is offline
 
Join Date: Dec 2019
Location: Highland, CA
Posts: 615
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When I got my -12 the cowl had already been modified to move the cooler forward. I still had oil temps that were not acceptable. I am in HOT SoCal and I wanted to use full power without worrying about overheating the oil. I added a second oil cooler. It absolutely ended my heat issues.

http://waltsrv12.com/engine/adding-second-oil-cooler/
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  #3  
Old 05-18-2023, 07:16 PM
rgmwa rgmwa is offline
 
Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,751
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It was a forum topic a few years ago. I modified my cowl during the build in 2013 to bring the oil cooler forward about an inch, as did a number of other builders around that time. I've never had an issue with temperatures in hot summer weather.
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  #4  
Old 05-18-2023, 07:45 PM
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Piper J3 Piper J3 is offline
 
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Location: Hinckley, Ohio
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Default

See... https://vansairforce.net/community/s...ght=oil+cooler
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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 850

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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  #5  
Old 05-19-2023, 06:33 AM
Jcurry Jcurry is offline
 
Join Date: Jul 2021
Location: Cocoa,Fl
Posts: 169
Default Exhaust clearance

Quote:
Originally Posted by Piper J3 View Post
Hi Jim,
I can't tell in the completed picture. Did you have to make an indentation for the exhaust stack on the LH side or just move 1" forward and tab back in?

Thank you
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  #6  
Old 05-20-2023, 12:04 AM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 3,393
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I live in Phoenix. Last year I trimmed a couple of inches from the lower cowl trailing edge to open the air exit and increase air flow. It made some improvement in temps, but not as much as I needed. This year I cut a 4Ē diameter circular hole in front of the cooler. The top edge of the hole is about 3/4Ē below the original cowling air intake opening. One flight so far at 90F OAT at takeoff. It still runs hot during climb out, but at least I was able to make a continuous climb to 6500 MSL (5500 AGL) without hitting 250F oil temp. After a few more flights Iíll be able to better judge the effectiveness, and Iíll post again.
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  #7  
Old 05-20-2023, 02:05 AM
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Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
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Quote:
Originally Posted by Jcurry View Post
Hi Jim,
I can't tell in the completed picture. Did you have to make an indentation for the exhaust stack on the LH side or just move 1" forward and tab back in?

Thank you
The LH exhaust spring was touching the cooling air duct for the water radiator. This modification was done prior to moving the oil cooler 1" forward.
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__________________
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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 850

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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  #8  
Old 05-20-2023, 09:15 AM
azonslow azonslow is offline
 
Join Date: Mar 2017
Location: Maricopa County, AZ
Posts: 31
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My partner and I moved the radiator opening about 1" forward using posts here to guide us because of the heat in Phoenix. It helped somewhat but I believe the only real fix is to install Vans later exhaust system that moves the muffler itself back a few inches. We did not do that.
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  #9  
Old 05-20-2023, 10:21 AM
seagull seagull is offline
 
Join Date: Dec 2019
Location: Highland, CA
Posts: 615
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I know several -12is owners in hot climates that still get hot. They have the new exhaust. Thatís a big $ investment.
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  #10  
Old 05-29-2023, 09:55 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
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I have flown three times with OAT on takeoff of 90 F since cutting the cooling hole in the lower cowling. It has stopped the Oil Temp alarms on climb out to 3500 MSL from a field elevation of about 1000 MSL. Still runs high into the yellow band, but a distinct improvement.
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