Home > VansAirForceForums

-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

Go Back   VAF Forums > Main > RV Ongoing Maintenance Issues
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Thread Tools Search this Thread Display Modes
Old 11-29-2020, 11:33 AM
edclee edclee is offline
Join Date: Aug 2008
Location: Lancaster, SC
Posts: 166
Default UPDATE-SUCCESS Ball Valve to control Oil Cooler FLow

Has anyone attempted installing a ball valve in one of the oil cooler lines to deal with too cool oil temps? I am concerned that completely blocking oil flow to the cooler may create oil flow to the engine. I know the vernatherm should act as a pressure bypass even if the oil temp is high enough to cut off the vernatherm blocking the bypass port but I does seem it would restrict oil pump output.
Sonex/Corvair 2016 Finished, Sold 2020
RV-9A 2005 Purchased
IO-320 160 hp
Exempt but happily paid for 2021

Last edited by edclee : 12-08-2020 at 11:01 AM. Reason: Update
Reply With Quote
Old 11-29-2020, 12:04 PM
pierre smith's Avatar
pierre smith pierre smith is offline
Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,896
Default Nope

Hi Ed,
The general approach to oil temp control is in the air supply. Much safer than oil restriction....simpler too. Lotsa information on here regarding oil cooler control.

Rv10 Sold
46 years ag pilot/CFI
Air Tractor 502/PT-6
Building RV-12, Wings, fuse, emp complete. FWF in progress.
Reply With Quote
Old 11-29-2020, 02:12 PM
Ironflight's Avatar
Ironflight Ironflight is offline
VAF Moderator / Line Boy
Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,606

I flew with Larry Vetterman in his Super Cub a few years back, and he’s got a knob to a ball valve to control flow to the cooler. No vernatherm installed. He says this is pretty common in the back country Cub world, and it sure seemed to work well for him!

Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
Reply With Quote
Old 11-29-2020, 04:07 PM
pierre smith's Avatar
pierre smith pierre smith is offline
Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,896
Default ??

...and if the valve is closed, do you starve the engine of oil?

There has to be more....
Rv10 Sold
46 years ag pilot/CFI
Air Tractor 502/PT-6
Building RV-12, Wings, fuse, emp complete. FWF in progress.
Reply With Quote
Old 11-29-2020, 06:12 PM
jrs14855 jrs14855 is offline
Join Date: Apr 2008
Location: Lake Havasu City AZ
Posts: 2,446
Default Oil Cooler Valve

It is not possible to compromise oil pressure by closing the ball valve. Basically with the valve closed the engine reverts back to the same configuration as a non oil cooler engine, one example being early 0 235 engines installations as in some Pipers.
Reply With Quote
Old 11-29-2020, 06:13 PM
AlexPeterson's Avatar
AlexPeterson AlexPeterson is offline
Join Date: Sep 2005
Location: Ottertail, MN
Posts: 2,411

The valve is in the oil cooler line. The vernatherm is disassembled, with the guts taken out, and the housing tightened back in to plug that hole. The oil cooler bypass spring and plunger are put in the accessory housing (Lycoming parts 69436 and 62415). It is this spring/plunger which would then "ride" open if you closed the oil cooler flow completely. One should probably not allow the valve to completely close. I got this info from Larry V directly.

Most of our engines simply have a plug in this hole, which is just forward of the oil filter housing, on top.
Alex Peterson
RV6A N66AP 1700+ hours
KADC, Wadena, MN
Reply With Quote
Old 11-30-2020, 09:58 AM
Ralph Inkster Ralph Inkster is offline
Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 1,288

A couple friends run with a bypass valve in the cooler lines. In cold weather operation, the oil normally on its way to the cooler is diverted back into the circuit . No need to remove or modify the Vernatherm
built a few RVs, rebuilt a few more, hot rodded more, & maintained/updated a big bunch more
Reply With Quote
Old 12-01-2020, 08:06 AM
219PB 219PB is offline
Join Date: Aug 2014
Location: Victoria, Tx
Posts: 481
Default Modify the ball valve

I am not being a proponent of this solution but could not resist this recommendation. A hole can be drilled into the ball of the ball valve so that when it is in the closed position, a minimum amount of oil would still flow through the valve.

Sizing of the hole would be calculated based on the viscosity of the oil at temperature, pressure of the oil system, and the diameter of the ball.
Paul Bonorden
RV-6A Flying
My Builders Website
Victoria, TX
Reply With Quote
Old 12-01-2020, 11:28 AM
vetterman vetterman is offline
Join Date: Oct 2006
Location: TX
Posts: 64
Default Ball valve

Let me chime in here as I have this unit in my airplanes. I didnít invent it but in 1984 my first -4 ran way too cool. A fellow and very knowledgeable RV recommended this to get the oil temperature up to a reasonable number. I was skeptical but took his advise and never looked back. It is important to set the valve up so full off still allows a small amount of oil to flow thru the cooler. No we never drilled any hole in the valve.
I was at Oshkosh and was approached by a guy explaining he had a problem with the oil temperature running too hot. I explained exactly how to do it and he called me with the results. Deleting the vernatherm and installing the spring and plunger reduced his oil temperature 35-40 degrees.
All of my years building exhaust systems I would get calls about high oil temps and if the builder was a hands on type I would explain how and why it works. I was asked many times to go public and post it, but I never did as I figured some guy would forget to watch the temperature and let it get too hot and blame me for it.
RVs arenít the only place this is a common practice. The PA-18 150 supercub came out with the spring and plunger along with the oil screen and there was a plate that went on the nose bowl over the oil cooler entrance when the temperature was below 40F. The addition of the vernatherm and oil filter setup excluded the spring and plunger. Now there are different brands of oil filter setups and some use the same hole in the accessory case as the spring and plunger and some donít.
Bottom line is the ball valve setup has been around for many years and thousands of hours of engine time and it works. The key is to watch and adjust the valve just like RPM and MP.
Reply With Quote
Old 12-01-2020, 11:29 AM
PerfTech's Avatar
PerfTech PerfTech is offline
Join Date: Sep 2010
Location: Redlands, Ca.
Posts: 1,508
Talking Problem Solved!!

... Go to our website and see our oil cooler shutters that are opened and closed
via a cockpit control cable. Thanks, Allan..
Allan Nimmo
Innovative Aircraft Safety
Products, Tools & Services
Southern California (KREI)
RV-9A / Edge-540
(909) 824-1020
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -6. The time now is 10:22 AM.

The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.