Cooling engine iS

by Stanislav Zubar in 912iS Technical Questions 8 years ago

Good day to everyone here.
I'm very glad to join your community.
My name Stanislav and I'm from Ukraine.
I have bought new aircraft with iS Sport engine.

I realized that iS engine is not very easy to operate.)
I will try to understand how and what to do to it was comfortable to operate it.

I have one question, on which now I think:

What are the RPM engine cools better on the ground after long taxi? 2500 RPM or another?

In the air, there are no problems with the cooling of the engine, enough to make a horizontal flight, and then again to continue the climb.
But on the ground can be a long taxi, where the temperature can rise and then what should a pilot do?

Re: Cooling engine iS

by Roger Lee » 8 years ago

Roger Lee

125 5.11k 4.52k

No special rpm to cool. Try around 1900-2000 rpm. I wouldn't let it idle for excessive time just to let it cool a few degrees. If it isn't hot just shut it down.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

Thank you said by: Stanislav Zubar

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Re: Cooling engine iS

by Richard Boslaugh » 8 years ago

Richard Boslaugh

9 122 84

You ask about engine cooling after long taxi. 1: I taxi at 2000 RPM, if taxi is at a lower RPM the normal play in the gear box will
allow the gears to mesh/un-mesh causing early wear of the gear box. It is much easier and costs less to replace brake pads than to
overhaul the gear box. As a result of taxi at a higher RPM the engine cooling is more efficient. 2: I have never had any cooling problem
at any outside temperature. 3: I usually run the engine at 2500 RPM while doing pre-takeoff checks. 4: However, the design of the engine cowling plays a very important part in engine cooling. There are some past comments in this forum concerning cowling design and cooling
radiator location which you can find using the forum search function. Taxi at 2000 RPM is my personal choice and to my knowledge is not
a ROTAX endorsed procedure.

Concerning you comment about the 912iS not being easy to operate: I find the engine much easier to operate than the average aircraft engine. The computers take care of many functions giving the pilot more time to fly the aircraft. The absolute DO NOT issues are,
do not exceed max RPM, do not advance throttle rapidly (that causes very large forces to be applied to the gear box/engine), do not
operate at continuious cruise power above 5500 RPM.

Thank you said by: Stanislav Zubar

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Re: Cooling engine iS

by Stanislav Zubar » 8 years ago

Stanislav Zubar

3 8 0

I have a little problem with temperature of oil.

When I fly "touch and go" or climbing I see that temperature of oil can increase to yellow zone and reach 113 degrees.
Aircraft is new. It (or she...) has flown only 55 hours.
I asked from designer about this temperature (113 degrees). He told me that everything is OK and this temperature is normal for this iS Sport engine.

What do you think about 113 degrees during climbing?
Should I level off or I can continue to fly with temperature of oil?

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Re: Cooling engine iS

by Roger Lee » 8 years ago

Roger Lee

125 5.11k 4.52k

Hi Stanislav,

133C (235F) is very normal for climbing for all 912 engines. Part of this is also dependent on how the cowl and radiators are setup. Some are a little less and some are a tad more.
230F is the start of the yellow for oil temps and all it's saying is keep an eye on me in case I go too high. When you level off and flight it should go down to 210F-220F depending on the OAT's and your plane's configuration. I wouldn't worry if that's all you see.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

Thank you said by: Stanislav Zubar

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Re: Cooling engine iS

by Geoffrey McDougall » 8 years ago

Geoffrey McDougall

2 7 0

Had a cooling issue with the engine on the ground and suspected an airlock in the coolant system. after draining and refilling the system the cooling issue was resolved. See my post on page 4 from over 2 years ago.

Thank you said by: Stanislav Zubar

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Cooling engine iS

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