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04-30-2009, 12:48 PM
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Join Date: Jan 2006
Location: South Africa
Posts: 840
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Hot oil temps
A friend's 10 did it's maiden flight today here in South Africa! Everything fine, but oil temp went up to 240 degrees C! He has used the standard oil cooler form Vans. The advise given to him now is to install a second oil cooler on the right side of the cooling baffles. What is the general feeling out there? Vans plan or extra oil cooler?
Much appreciated.
Jan.
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Jan Hanekom
South Africa
Approved Person nr 325
http://www.rvbits.com
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04-30-2009, 12:55 PM
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Join Date: Jun 2005
Location: Cedar Park, TX
Posts: 3,152
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Quote:
Originally Posted by Janekom
A friend's 10 did it's maiden flight today here in South Africa! Everything fine, but oil temp went up to 240 degrees C!
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Surely you mean 240 deg F ?
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Scott Card
CQ Headset by Card Machine Works
CMW E-Lift
RV-9A N4822C flying 2200+hrs. / Cedar Park, TX
RV8 Building - fuselage / showplanes canopy (Done!)
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04-30-2009, 01:00 PM
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Join Date: Jan 2006
Location: South Africa
Posts: 840
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Yep  We live in a wonderful world. I did mean 240 deg F.
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Jan Hanekom
South Africa
Approved Person nr 325
http://www.rvbits.com
RV10 - ZU-XOX - (Flying)
RV7A - ZU-JRV - (Flying)
RV10 - ZU-JVR - (Written off)
RV7 - ZU-LOL - (Flying)
RV10 - ZU-RVI - (Flying)
RV7A - ZU-MER (Bought back)
RV7A - ZU-JAD (Sold Flying)
Dues paid for 2020 WITH A SMILE
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04-30-2009, 02:30 PM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,624
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Jan, some more info on the engine and install might help. Is it injected or carb? Before you go installing a second oil cooler make sure you have good airflow to and across the current oil cooler. It is all about airflow across the cooler, and if it's not there, a second oil cooler won't help.
How ere the cylinder head temps? How long was the flight and at what power settings>
Vic
__________________
 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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05-01-2009, 03:53 AM
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Join Date: Jan 2006
Location: South Africa
Posts: 840
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Sorry guys. I should have given more info. This RV10 is as standard as can be as per Vans plans. Lyco IO-540 with Hartzell prop. This is the fourth RV this friend has built so he he knows what to do, but this is the first RV10 he did. Anyway he will go through everything again.
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Jan Hanekom
South Africa
Approved Person nr 325
http://www.rvbits.com
RV10 - ZU-XOX - (Flying)
RV7A - ZU-JRV - (Flying)
RV10 - ZU-JVR - (Written off)
RV7 - ZU-LOL - (Flying)
RV10 - ZU-RVI - (Flying)
RV7A - ZU-MER (Bought back)
RV7A - ZU-JAD (Sold Flying)
Dues paid for 2020 WITH A SMILE
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05-01-2009, 07:10 AM
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Join Date: May 2008
Location: Brisbane Qld. Aust.
Posts: 2,271
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Check the temp sender is working correctly!
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05-01-2009, 10:25 AM
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Join Date: Dec 2006
Location: Atlanta, GA
Posts: 1,231
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Quote:
Originally Posted by RV10inOz
Check the temp sender is working correctly!
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Yep - in particular, if you have the sort of oil temp sender included with Dynon and your battery is in the rear, then if the ground between the Avionics bus and the sender (e.g. thread sealant inhibiting connection or poor ground strap connections) then the sender will read "high" in proportion to the total resistance. I bought a 20 year old plane and upgraded to a Dynon, and the oil temps read as much as 50 degrees "hot" due to a corroded ground attach bolt. |
05-01-2009, 12:31 PM
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Join Date: Oct 2008
Location: Lake Country, B.C. Canada
Posts: 2,416
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hi temps
...I'm sure the 'real' mechanics will chime in anytime...
ensure you've plumbed the cooler bottom flow to top, that you don't have an 'air lock' etc. If you're 'breaking in' or running lean, you'll see elevated temps.......but they'll come down.
Fluid (air) dynmics suggest flow can be doubled by using a curved inlet and outlet lip.
..in short, exhaust all the options before adding the weight and plumbing of a second cooler!
best of luck!
__________________
Perry Y.
RV-9a - SOLD!....
Lake Country, BC
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05-01-2009, 02:40 PM
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Join Date: Dec 2006
Location: South Africa
Posts: 21
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Hi All,
I was (am) the test pilot.
As stated by Jan, the aircraft has a Lycoming IO-540.
The oil cooler is 100% as per the Van's installation instructions, fitted below the number 6 cylinder with the air feed from the baffle behind no 6.
We are using a temp probe supplied by Van's for the IO-540, being read by the MGL Odyssey glass panel.
We have not checked the probe yet but I can tell you that the oil got HOT.
The motor had run for 45 minutes on a bench prior to take off. Take off normal, CHTs initially all went to around 435. Kept the speed up and mixture rich and within about 15 minutes 4 of them were just below 400 deg and 2 just above - perfect for a new engine!
The oil temp gradually rose to 236 degrees after around 20 minutes into the flight. I joined the circuit to land and as I slowed on final approach, the temp rose to 242 degrees. Just prior to shut down after a short taxi it peaked at 243.
We have 6 10s flying in SA. Two have added another cooler and the problem has gone away.
A third cannot maintain full power (70 hrs on the engine) without the temps exceeding 230. We are planning another cooler into this one as well.
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05-01-2009, 03:51 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,026
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Quote:
Originally Posted by ZU-RVZ
Hi All,
I was (am) the test pilot.
As stated by Jan, the aircraft has a Lycoming IO-540.
The oil cooler is 100% as per the Van's installation instructions, fitted below the number 6 cylinder with the air feed from the baffle behind no 6.
We are using a temp probe supplied by Van's for the IO-540, being read by the MGL Odyssey glass panel.
We have not checked the probe yet but I can tell you that the oil got HOT.
The motor had run for 45 minutes on a bench prior to take off. Take off normal, CHTs initially all went to around 435. Kept the speed up and mixture rich and within about 15 minutes 4 of them were just below 400 deg and 2 just above - perfect for a new engine!
The oil temp gradually rose to 236 degrees after around 20 minutes into the flight. I joined the circuit to land and as I slowed on final approach, the temp rose to 242 degrees. Just prior to shut down after a short taxi it peaked at 243.
We have 6 10s flying in SA. Two have added another cooler and the problem has gone away.
A third cannot maintain full power (70 hrs on the engine) without the temps exceeding 230. We are planning another cooler into this one as well.
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One piece of info not yet provided is what the OAT was at the time of the flight?
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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
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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