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  #1  
Old 09-13-2021, 11:57 AM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 3,163
Default Legacy R-12 Overheating Solution

I live in Phoenix. My 12 was licensed in 2012, and itís pretty much the original design with D180 avionics. In summer I frequently get CHT and Oil temperature alarms during climb out, and sometimes I just canít fly when it gets above 90F..

A few weeks ago I made some modifications suggested by my friend, Adam, at Flying Cacti flight school. I trimmed 3 1/2 inches from the lower cowl aft edge in the area of the cooling air outflow, installed two small deflectors just forward of the the edge on the outside to create a low pressure area at the air discharge and wrapped my muffler in a thin layer of exhaust insulation. Since then I have been flying in 98F temps and not picked up alarms although I still get into the caution range sometimes on climb out.

As an aside, Adam showed me the 12is his school is using, and he told me the relocation of the oil cooler and radiator have eliminated the overheat issue in the 12is.
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  #2  
Old 09-13-2021, 12:37 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,563
Default

Any chance of posting some photos? I'm curious what type of wrap you put on the muffler...
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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 750

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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  #3  
Old 09-13-2021, 12:39 PM
funflying funflying is offline
 
Join Date: Oct 2006
Location: arvada, co
Posts: 502
Default

Could you post a photo of this modification or a link to a couple photos.
Thanks
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Patrick Claar
Arvada, CO BJC
RV12, #401, Flying 2013, N612PC
RV6, 1996-2010 sold
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  #4  
Old 09-13-2021, 12:53 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,563
Default

I would caution against using a woven fiberglass cloth for wrapping the muffler. I used high-temp wrap on the right front exhaust tube with the thought of shielding the oil line that passes through the loop. The fiberglass breaks down with heat and vibration over time and sheds glass fibers everywhere inside the cowling including on the air filters. It would be bad if abrasive fiberglass found its way into the intake manifolds…
__________________
-
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 750

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 09-13-2021, 02:27 PM
NinerBikes NinerBikes is offline
 
Join Date: Dec 2018
Location: Granada Hills
Posts: 1,193
Default

What, exactly, are you using for exhaust insulation?

Pictures and dimensions of 2 small deflectors, as well as aprox angle from existing surface?

How much additional drag, and or loss in airspeed noted?
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RV-12, KWHP based

"Time to Spare, go by Air."

Last edited by NinerBikes : 09-13-2021 at 02:36 PM.
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  #6  
Old 09-13-2021, 11:10 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 3,163
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Iíll be out at the hangar Wednesday and get some pics. The muffler insulation I used was a sheet of fiberglass with adhesive on one side and shiny aluminum (?) on the other from Auto Zone.
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  #7  
Old 09-14-2021, 08:19 AM
Jcurry Jcurry is offline
 
Join Date: Jul 2021
Location: Cocoa,Fl
Posts: 33
Default

I would also like to see dimensions and pics of your modifications please.
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Jack
Cocoa, Fl
Proud new non-builder owner of RV12 N214LA
ASEL, A&P
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