Home > VansAirForceForums

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

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

Old 05-29-2019, 04:39 PM
kdedmunds kdedmunds is offline
Join Date: Jul 2013
Location: Tallahassee, FL
Posts: 80
Default Oil Temps too High

I have flown my RV14 for close to 50 hours. Most of that time has been in the winter when temps were a little cooler. On an aggressive climb i would get oil temperatures in the 220s but leveling out I would get back to 180s and could lean the fuel injected IO 390 to about 10 gal per hour. Now Im climbing at 300 ft/min to reach altitude and forget leaning at all. I can keep the temps in the high 190's running the engine at full rich but as soon as I lean I start climbing in temperature. The oil cooler is standard for the engine and I know there are 14's out there that are running with oil temps just fine. Any suggestions?
K Edmunds
Reply With Quote
Old 05-29-2019, 05:08 PM
bkervaski's Avatar
bkervaski bkervaski is offline
Join Date: Mar 2017
Location: Birmingham, Alabama
Posts: 1,757

Did you seal your baffle so no air is escaping? There are a number of areas that need filled with RTV.
RV-14A #140376
N196 (Flying)
2019 Bronze Lindy
Reply With Quote
Old 05-29-2019, 06:25 PM
Bavafa Bavafa is offline
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,523

Hi Ed,
For a better comparison with other 14s, perhaps a bit more info would be useful. What are the OAT for those temps and what is the target altitude?

As a reference, my temps have also gone up a fair amount than during the winter time but not nearly as high as you are reporting.
On my last cross country trip, I was able to climb to 12000 ft from sea level at 700-800 fpm with the OAT of 86 but my temp got as high as 212. During slow flight (practice approach) I easily see temps in the 200+ range but if I speed up to the normal cruise speed, it comes back down quickly. My cruise speed temps are in the 185 range unless I am high up and cooler temps.
As mentioned above, make sure all baffles are sealed well including the oil cooler.
I miss my oil temp during the winter time.
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Flying
Dues paid
Reply With Quote
Old 05-30-2019, 04:51 AM
vic syracuse vic syracuse is offline
Super Moderator
Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,682

I really don't think there is anything wrong with those temps. Hitting 220 or so in the climb in the summer is fine, especially since you are getting back into the 180's in cruise. Make sure the quantity is at 6 qts.
I saw the same thing with the factory demos, and the first time I saw it climbing above 210 I was a little concerned, but then I started experimenting with full power climbs to 10K' in the Atlanta summer heat and noticed it cooled right back down very quickly, so I quit being concerned about it. I also think as you get more time on the engine they will come down some as well.

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"

Last edited by vic syracuse : 05-30-2019 at 04:53 AM. Reason: more explanation
Reply With Quote
Old 05-30-2019, 06:01 AM
DanH's Avatar
DanH DanH is online now
Join Date: Oct 2005
Location: 08A
Posts: 9,894

The IO-390 operator's manual is clear. For maximum engine life, the desired oil temperature is 185F.

No one, including the staff at Vans, would consider this performance acceptable:

Originally Posted by kdedmunds View Post
Now I'm climbing at 300 ft/min to reach altitude and forget leaning at all. I can keep the temps in the high 190's running the engine at full rich but as soon as I lean I start climbing in temperature.
There is something wrong. Happy to help, but we'll need more information, photos, etc. ID the ignition system and timing, and post a few photos with the upper cowl removed.
Dan Horton
Barrett IO-390

Last edited by DanH : 05-30-2019 at 06:43 AM.
Reply With Quote
Old 05-30-2019, 07:47 AM
F1Boss's Avatar
F1Boss F1Boss is offline
Join Date: Aug 2006
Location: Taylor Texas
Posts: 835
Default Inlets?

I know the 14 has a wider fuselage, so the cowling is from a different mold to allow it to fit - but are the inlets also reworked to allow for the larger engine? If all the other recommended checks and fixes are done, and the temps still are not what they should be - it could be time to add a set of (non-patented) Dan Horton Inlets - sure fixed all temp problems for me!

Yes, the plane should be able to climb at ~130KIAS all the way to cruise altitude with no problems.

"Not everyone needs a Rocket. Some folks, however, shouldn't live life without one.
You know who you are."
Budd Davisson, 1997
Reply With Quote
Old 05-30-2019, 08:18 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,901

Like Dan said, you have problem(s) to investigate. With a stock setup you should have lower temps. I'd start by looking for obvious stuff, like a blockage in the air going to the cooler. Leave a rag in the oil cooler plenum?

Side note - I have used the Airflow Systems 2006X cooler in two airplanes and recommend them over the one Van's provides in their Firewall Forward kit.

Reply With Quote
Old 05-30-2019, 08:27 AM
Bavafa Bavafa is offline
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,523

From my Lycoming manual
"Oil Temperature: The maximum permissible oil temperature is 235?F (118?C). For maximum engine life, the desired oil temperature should be maintained between 165?F (73.8?C) and 200?F (93.3?C) in level-flight cruise conditions."

In checking with other RV14 drivers, temps in the 210 range in the steady climb and 185-195 during cruise has been the common temp.
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Flying
Dues paid
Reply With Quote
Old 05-30-2019, 09:42 AM
rvbuilder2002's Avatar
rvbuilder2002 rvbuilder2002 is offline
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,265

During development of the RV-14 (and the FWF kit specifically), flight testing was done in relatively hot temps (90-95 F.) by doing a take-off from 160 ft MSL and climbing to 10K feet at Vy (best rate) for the entire climb, with the aircraft ballasted to gross weight.

The highest peak oil temp I recall was just over 220F. This would occur at some point during the climb and the temp would begin to drop before reaching 10K feet.

Keep in mind that this was a climb to 10K feet using best rate of climb speed for the entire climb. This is not a typical operation mode. Using a cruise climb airspeed has a very small impact on ROC but a very large impact on cooling. If traveling cross country it also gets you down the road more quickly and provides for a higher overall miles per gallon on a cross country trip.
I personally cruise climb (and descend) at 500 FPM unless there are terrain constants.

New engines will tend to run a bit hotter in oil temp. Some engines will have temps continue to reduce further going out beyond 50 hrs, but in this case I would be searching for issues that would be allowing air leakage from the baffle system.
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 ")
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 05:37 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.