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912uls cooling

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ajroseca(at)nf.sympatico.
Guest

Posted: Sun Aug 18, 2013 7:23 am Post subject: 912uls cooling

Hi Guys

 I have a zenair ch701  which has a 912uls engine..I recently put this  aircraft on

 full lotus floats and it gets off and flies good however it seems that the  oil temperature

 is going higher then normal,,I sometimes see the temperature a 230 and more  after take off

 It has the air scoop for the oil cooler on the passenger side and I widened  the scoop for more air

   The guide says 190 to 230 is the most favourable operating  temperatures.

 I consider it to be high as I usually see temps in the 200 â€“210 area..also  when I check the

 oil and follow the test of rotating the propeller and listening for the  gurgle in the header tank

 I do not hear it..I am using the mobile MX 4T racing oil as suggested...  what is the oil filter

 part number and which is the best suggested replacement filter to use..what  does the group

 consider normal temperatures for the 912ULS engine

 all advice and suggestions would be appreciated

 Happy flying

 AJ Rose

   [quote][b]

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asc23111964(at)hotmail.co
Guest

Posted: Sun Aug 18, 2013 8:49 am Post subject: 912uls cooling

Hi AJ,

Andy Cullum from UK.

I own a Rotax 912uls Europa Tri gear poised for test flying!

I suggest you contact Lockwood Aviation in the states,(I'm assuming youre stateside! )as they have oil

Filters for the 912uls in stock,they are genuine Rotax ones,don't be tempted to try and get cheaper automotive ones,as the mounting threads are similar but not the same.

There was an incident in the UK sometime back where a Europa had been fitted with one of these automotive filters,he lost all the oil,over the English Channel,and made an emergency landing on Sark,he was ok,

But the aircraft was sadly wrecked.

When you try and burp the engine,have

You removed the filler cap?

If you don't,you won't hear the gurgle,

Also pause between compressions,as this allows air to escape.

I find it normally takes about 25-30 compressions to get my engine to gurgle.

Best regards

Andy Cullum.

Sent from my iPhone



On 18 Aug 2013, at 16:27, "AJR" <ajroseca(at)nf.sympatico.ca (ajroseca(at)nf.sympatico.ca)> wrote:

[quote]    Hi Guys

 I have a zenair ch701  which has a 912uls engine..I recently put this  aircraft on

 full lotus floats and it gets off and flies good however it seems that the  oil temperature

 is going higher then normal,,I sometimes see the temperature a 230 and more  after take off

 It has the air scoop for the oil cooler on the passenger side and I widened  the scoop for more air

   The guide says 190 to 230 is the most favourable operating  temperatures.

 I consider it to be high as I usually see temps in the 200 â€“210 area..also  when I check the

 oil and follow the test of rotating the propeller and listening for the  gurgle in the header tank

 I do not hear it..I am using the mobile MX 4T racing oil as suggested...  what is the oil filter

 part number and which is the best suggested replacement filter to use..what  does the group

 consider normal temperatures for the 912ULS engine

 all advice and suggestions would be appreciated

 Happy flying

 AJ Rose

   [quote][b]

- The Matronics RotaxEngines-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?RotaxEngines-List

asc23111964(at)hotmail.co
Guest

Posted: Sun Aug 18, 2013 8:49 am Post subject: 912uls cooling

Hi AJ,

Andy Cullum from UK.

I own a Rotax 912uls Europa Tri gear poised for test flying!

I suggest you contact Lockwood Aviation in the states as they have oil

Filters for the 912uls in stock,they are genuine Rotax ones,don't be tempted to try and get cheaper automotive ones,as the mounting threads are similar but not the same.

There was an incident in the UK sometime back where a Europa had been fitted with one of these automotive filters,he lost all the oil,over the English Channel,and made an emergency landing on Sark,he was ok,

But the aircraft was sadly wrecked.



Sent from my iPhone



On 18 Aug 2013, at 16:27, "AJR" <ajroseca(at)nf.sympatico.ca (ajroseca(at)nf.sympatico.ca)> wrote:

[quote]    Hi Guys

 I have a zenair ch701  which has a 912uls engine..I recently put this  aircraft on

 full lotus floats and it gets off and flies good however it seems that the  oil temperature

 is going higher then normal,,I sometimes see the temperature a 230 and more  after take off

 It has the air scoop for the oil cooler on the passenger side and I widened  the scoop for more air

   The guide says 190 to 230 is the most favourable operating  temperatures.

 I consider it to be high as I usually see temps in the 200 â€“210 area..also  when I check the

 oil and follow the test of rotating the propeller and listening for the  gurgle in the header tank

 I do not hear it..I am using the mobile MX 4T racing oil as suggested...  what is the oil filter

 part number and which is the best suggested replacement filter to use..what  does the group

 consider normal temperatures for the 912ULS engine

 all advice and suggestions would be appreciated

 Happy flying

 AJ Rose

   [quote][b]

- The Matronics RotaxEngines-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?RotaxEngines-List

Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Sun Aug 18, 2013 5:02 pm Post subject: Re: 912uls cooling

Since you just put your plane on floats make sure your prop pitch is setup for the extra drag. You may want to set your prop pitch to achieve at least 5600 -5800 rpm at WOT flat and level.  Adding the drag will automatically increase the oil temp. No big deal as 230F isn't an issue. If you fly in the Southwest US 230F is an everyday  norm during the hot months. Up to 240F doesn't bother me, but mine seems to be good at around 230F - 235F in climb and around 220F for cruise (OAT 95-100F). My prop can achieve 5600-5650 rpm WOT flat and level. 

Use the correct oil filter. Rotax Part #825-012. Many years ago the difference from an automotive filter to a Rotax was negligible, but not when they came out with the latest oil filter. The automotive filter by pass pressure is only 12-15 psi and years ago the Rotax was 13-16 psi. Now days the Rotax by pass pressure is 18-22 psi, the filter has a check valve in it not found in an automotive filter and a much softer better designed anti drain back membrane. It still has a paper element, but there are now significant difference so stay with Rotax. Of course there are those that say I have had an automotive filter on for a while.  This is like smoking cigarettes. One cigarette or even one pack won't kill you or cause a disease, but a life time is deadly and causes debilitating diseases.



You own an expensive engine and an expensive one to repair treat it right and don't cause yourself any avoidable long term headaches and wallet strains.

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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

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