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High oil and coolant temps

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2 months 3 days ago #22634 by amhst56@gmail.com
High oil and coolant temps was created by amhst56@gmail.com
Hi all,

I was hitting 230f cht and 240 oil temp today in sunny 70f weather.
In 60f weather I was hitting 220f cht and 230 oil temp.

Both temps above were in cruise 5200 rpm.
Temps hit higher if im climbing.

Since both are high, I'm figuring that the cowl is the problem?

I've read so many things on air flow in cowls, I'm not sure what to do...
1 to 3 air inlet to outlet
vents in the top of cowl to let heat out
Flange before bottom outlet for Venturi effect
Build baffles around engine

The rotax mechanic moved the oil cooler from front to firewall, blocked old opening and used 3 inch duct to oil cooler due to high temps that other owner had.

Thoughts on:
ducting a second 3 inch pipe to oil cooler?
unblocking opening and let air run through?

Any thoughts would be most helpful
Thx

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2 months 3 days ago #22635 by garrett
Replied by garrett on topic High oil and coolant temps
Don't reinvent the wheel. Just copy a cooling setup that works. Maybe get the oil cooler out front.

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2 months 3 days ago #22636 by amhst56@gmail.com
Replied by amhst56@gmail.com on topic High oil and coolant temps
Hi Garrett,

You are right, I shouldn t have to reinvent the wheel.

the rotax mechanic that put it in the firewall said there were issues with it getting hot out front. He also said that the original owner Installed a thermostat and had hoses everywhere. My personal opinion is that he moved to firewall because of the hoses...

Anyway, do you happen to have any pics of how the remos oil cooler is installed?
Or a link to the parts manual?
Or anyone else have any suggestions on how to install out front again?

Not sure if i should put it on rubber bushings or just use some aluminum angle or what.
The manufacturer of mine went out of business and the mechanic didn't leave any parts...

Thx

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2 months 2 days ago - 2 months 2 days ago #22654 by amhst56@gmail.com
Replied by amhst56@gmail.com on topic High oil and coolant temps
Hi all,

I'm having trouble thinking of the best way to make a bracket to put my oil cooler back out front.
If you dont mind, could a couple people post some pics of how your oil cooler is mounted out front?
Or send to my email at amhst56@gmail.com

Garrett mentioned he would get some pics of his remos. That one is mounted on the gearbox to the puller hole, not sure about other side

How is the the CT mounted or others?

Any help would be appreciated
Thx!
Last edit: 2 months 2 days ago by amhst56@gmail.com.

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2 months 2 days ago #22656 by alananpat
Replied by alananpat on topic High oil and coolant temps
Here is my oil cooler installation. It has lasted for 863 hours and almost 13 years. Pay no attention to the exhaust abnormality; one pipe cracked and departed in flight. This is the ferry solution.

Alan

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2 months 2 days ago #22657 by amhst56@gmail.com
Replied by amhst56@gmail.com on topic High oil and coolant temps
Thx Alan,

Top is attacked to the bolt used to the pull the case.
What's the other side attacked to?
Do u have a pic of the other side?
Is the bottom attacked to the frame?

Thx

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2 months 2 days ago - 2 months 2 days ago #22658 by DHeal
Replied by DHeal on topic High oil and coolant temps
You could attach the oil cooler directly to the front of the fiberglass cowling with long-ish oil lines connecting the cooler to the engine. Of course, this means that you would have to unfasten the cooler from the cowling if you want to remove the cowling. On the RV-12 this is easily accomplished by removing two AN-3 bolts at the top of the cooler -- the bottom of the cooler is indexed/attached to the cowling via two positioning slots. Make sure that you provide sufficient space (@ couple of inches?) between the cooler and the super-hot muffler assembly.

See: www.vansaircraft.com/service-information-and-revisions/49-2/
Last edit: 2 months 2 days ago by DHeal.

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2 months 2 days ago - 2 months 2 days ago #22660 by amhst56@gmail.com
Replied by amhst56@gmail.com on topic High oil and coolant temps
Thx D,

I like it not being attached to the gearbox, lot of shaking during startup and shut down.

Not sure mine would be that easy to mount to the the cowl. It indented and not flat.

I really like the bracket vans have though.
Last edit: 2 months 2 days ago by amhst56@gmail.com.

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2 months 1 day ago #22664 by alananpat
Replied by alananpat on topic High oil and coolant temps
Both sides are attached the same way and the bracket is one piece. I have zero problems with this. The harder it is to remove your cowling, the less it will get removed. I haven't had to even retighten it. I did remove the gearbox for the 600 hour inspection. Just put it back together the same way.

Alan

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1 month 3 weeks ago #22709 by amhst56@gmail.com
Replied by amhst56@gmail.com on topic High oil and coolant temps
I have the cooler mounted out front, right below the oil pump.
It is tight...

I have to run the outlet pipe from the cooler up over the copilot cylinders and back under, then a 90 into the oil pump.

Any issue with the oil hose back up?
Thx

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1 month 3 weeks ago #22712 by garrett
Replied by garrett on topic High oil and coolant temps
I would try to keep it short, put a spring inside the hose (Like Roger Lee) has suggested in the past or use a couple of 90 deg fittings to make the bend.

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1 month 3 weeks ago #22713 by amhst56@gmail.com
Replied by amhst56@gmail.com on topic High oil and coolant temps
Thx Garret,

I thought of that, but putting in those bends would put 4 more places for possible leaks.
Was thinking the longer hose would be better in the long run?

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1 month 3 weeks ago #22714 by garrett
Replied by garrett on topic High oil and coolant temps
I just came across some Rotax data somewhere in the manuals where it defines hose I.D. based on length, keep that in my also keep in mind the hose chafing due to vibration. It probably does not matter how you do it as long as the hose is not kinked or restricted in some way.

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1 month 3 weeks ago #22715 by amhst56@gmail.com
Replied by amhst56@gmail.com on topic High oil and coolant temps
Thx fir the info!

Do u remember what manual by chance?
I looked for data on that and couldn't find it.
It would be just under 4ft with 1/2 inch mil h 6000 hose

Doing it this way would give me the most gradual bends and no chaffing.

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1 month 3 weeks ago #22716 by garrett
Replied by garrett on topic High oil and coolant temps
Here is Spec from the install manual.
www.manualslib.com/manual/847567/Rotax-912-Series.html?page=71

Also found this on a light Sport Forum.
According to the engine manufacturer, a fractured oil shaft drive pin is indicative of an oil system with restrictive
hoses and fittings that can result in a pulsating oil supply to the oil pump. The pulsating loading of the drive pin can result in a fractured drive pin. The Rotax 912 installation manual stipulates that oil hoses have an inside diameter of 11 millimeters. The oil hoses recovered with the wreckage had inside diameters that measured 9 millimeters. Additionally, the Rotax 912 installation manual stipulates full-flow angled fittings for oil hose connections. Examination of the oil cooler revealed a right-angle fitting that did not meet the engine manufacturer's full-flow fitting specification.
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1 month 1 day ago #22915 by amhst56@gmail.com
Replied by amhst56@gmail.com on topic High oil and coolant temps
Hi all,

I moved my oil cooler out front and it has been working good with just myself.
The oil cooler is not as wide as the opening so I could get a slightly wider cooler if need be.
Yesterday was a sunny 75 degrees, full fuel and passenger. Oil temp was hitting 230 in cruise and 250 climbing.

Is this normal on a warm day or should I get the slightly bigger oil cooler?

Thx

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1 month 1 day ago #22916 by amhst56@gmail.com
Replied by amhst56@gmail.com on topic High oil and coolant temps
Hi all,

I moved my oil cooler out front and it has been working good with just myself.
The oil cooler is not as wide as the opening so I could get a slightly wider cooler if need be.
Yesterday was a sunny 75 degrees, full fuel and passenger. Oil temp was hitting 230 in cruise and 250 climbing.

Is this normal on a warm day or should I get the slightly bigger oil cooler?

Thx

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1 month 1 day ago #22918 by kenryan
Replied by kenryan on topic High oil and coolant temps
Regarding oil operating temperatures, the Operators Manual for the 912ULS states:

Max 285
Min 120
Normal operating range: approximately 190 - 230

Based on that, if it were me I would try to get the temperatures down.

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1 month 1 day ago #22919 by amhst56@gmail.com
Replied by amhst56@gmail.com on topic High oil and coolant temps
Thx ken,

I was thinking the same, but wanted some other opinions since I'm new to this motor.

I have a 9x3 opening in my cowl, would a slightly bigger one help?

Anyone know what the sizes and part numbers are for the rotax one or should I go aftermarket and get one from earl's or setrab?

Thx

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1 month 21 hours ago #22921 by MesquiteTim
Replied by MesquiteTim on topic High oil and coolant temps
Be sure that your exit opening is larger than the inlet opening. You could install a lip at the exit opening to create a vacuum at the rear

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