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912 oil return line in silicon

 
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JohnFrance



Joined: 17 Sep 2014
Posts: 61
Location: Grenoble France

PostPosted: Fri Feb 21, 2020 10:49 am    Post subject: 912 oil return line in silicon Reply with quote

Hello,
I am replacing the hoses on my 912 and I am thinking of using silicon hose for the oil return line. This is probably the hose that is the most affected by heat as just above the exhaust system. It works in a low over pressure environment of around 0,35 bar yet I have never seen a silicon tube used on this line. On the other hand the oil pump feed line (used in an under pressure environment) is often made of silicon.
Is there a reason for not using a silicon return line as the rubber ones harden due to heat?
Regards,
John


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PostPosted: Fri Feb 21, 2020 10:58 am    Post subject: 912 oil return line in silicon Reply with quote

I think silIcone is good just watch your routing!

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Quote:
On Feb 21, 2020, at 1:53 PM, JohnFrance <77alembert(at)gmail.com> wrote:



Hello,
I am replacing the hoses on my 912 and I am thinking of using silicon hose for the oil return line. This is probably the hose that is the most affected by heat as just above the exhaust system. It works in a low over pressure environment of around 0,35 bar yet I have never seen a silicon tube used on this line. On the other hand the oil pump feed line (used in an under pressure environment) is often made of silicon.
Is there a reason for not using a silicon return line as the rubber ones harden due to heat?
Regards,
John

--------
Europa mono Nr 192




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=494929#494929











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PostPosted: Fri Feb 21, 2020 11:01 am    Post subject: 912 oil return line in silicon Reply with quote

John I believe silicon is fine just watch the routing around the exhaust. I have them on my 912

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Quote:
On Feb 21, 2020, at 1:53 PM, JohnFrance <77alembert(at)gmail.com> wrote:



Hello,
I am replacing the hoses on my 912 and I am thinking of using silicon hose for the oil return line. This is probably the hose that is the most affected by heat as just above the exhaust system. It works in a low over pressure environment of around 0,35 bar yet I have never seen a silicon tube used on this line. On the other hand the oil pump feed line (used in an under pressure environment) is often made of silicon.
Is there a reason for not using a silicon return line as the rubber ones harden due to heat?
Regards,
John

--------
Europa mono Nr 192




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=494929#494929











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SPURPURA



Joined: 04 Apr 2015
Posts: 48
Location: KAPV

PostPosted: Fri Feb 21, 2020 1:37 pm    Post subject: Re: 912 oil return line in silicon Reply with quote

Silicone will work but I’d still fire sleeve it.

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rickofudall



Joined: 19 Sep 2009
Posts: 1386
Location: Udall, KS, USA

PostPosted: Sat Feb 22, 2020 9:15 am    Post subject: 912 oil return line in silicon Reply with quote

What is the manufacturer's recommendation?  IF they say it's okay, you're good to go.  I've only used the blue silicone hose on coolant lines and the stuff, though pricey, is amazing.  After 15 years on a 582 install (with a lot of outside time) it's still as supple as new.  Over time it pays off in replacement costs and time spent.  For your application I would recommend you run fire sleeve over it though.Best of luck and safe flying,
Rick
On Fri, Feb 21, 2020 at 1:05 PM Robert Toth <rtoth4310(at)gmail.com (rtoth4310(at)gmail.com)> wrote:

Quote:
--> RotaxEngines-List message posted by: Robert Toth <rtoth4310(at)gmail.com (rtoth4310(at)gmail.com)>

John I believe silicon is fine just watch the routing around the exhaust. I have them on my 912

Sent from my iPhone

> On Feb 21, 2020, at 1:53 PM, JohnFrance <77alembert(at)gmail.com (77alembert(at)gmail.com)> wrote:
>
> --> RotaxEngines-List message posted by: "JohnFrance" <77alembert(at)gmail.com (77alembert(at)gmail.com)>
>
> Hello,
> I am replacing the hoses on my 912 and I am thinking of using silicon hose for the oil return line. This is probably the hose that is the most affected by heat as just above the exhaust system. It works in a low over pressure environment of around 0,35 bar yet I have never seen a silicon tube used on this line. On the other hand the oil pump feed line (used in an under pressure environment) is often made of silicon.
> Is there a reason for not using a silicon return line as the rubber ones harden due to heat?
> Regards,
> John
>
> --------
> Europa mono Nr 192
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=494929#494929
>
>
>
>
>
>
>
>
>

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kenryan



Joined: 20 Oct 2009
Posts: 378

PostPosted: Mon Feb 24, 2020 7:00 am    Post subject: 912 oil return line in silicon Reply with quote

The Rotax Installation Manual lays out the required specs on oil hoses. As far as heat, silicone is usually better than rubber ((at)500F vs (at)375F). Another spec is resistance to vacuum (hose collapse). I don't remember what else is discussed. Check the Installation Manual against the specs of the hose you are considering.

On Fri, Feb 21, 2020 at 9:53 AM JohnFrance <77alembert(at)gmail.com (77alembert(at)gmail.com)> wrote:

Quote:
--> RotaxEngines-List message posted by: "JohnFrance" <77alembert(at)gmail.com (77alembert(at)gmail.com)>

Hello,
I am replacing the hoses on my 912 and I am thinking of using silicon hose for the oil return line. This is probably the hose that is the most affected by heat as just above the exhaust system. It works in a low over pressure environment of around 0,35 bar yet I have never seen a silicon tube used on this line. On the other hand the oil pump feed line (used in an under pressure environment) is often made of silicon.
Is there a reason for not using a silicon return line as the rubber ones harden due to heat?
Regards,
John

--------
Europa mono Nr 192




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=494929#494929






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