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Oil and water hoses

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JonathanMilbank

Joined: 14 Apr 2012
Posts: 391
Location: Aberdeen area

Posted: Fri Jan 03, 2025 9:09 am Post subject: Oil and water hoses

Several years ago I bought a set of silicone hoses from someone in Sweden who created shaped coolant hoses for the Europa and also provided silicone hoses with protective lining for the oil system. He no longer makes or provides these items. Someone, but I can't remember who, stated that these hoses would last at least twice as long as the rubber types and I have no reason to doubt that.



However my engine is currently off the aircraft, so a fellow pilot who has a minor share of the aircraft would like the oil hoses to be replaced by rubber originals, even though the silicone looks and feels supple, as good as new! I would prefer to continue with silicone, because the recommendation is to replace ALL rubber items every 5 years. The oil hoses are the difficult ones to access, particularly the return line from the crankcase. But I must also consider my friend's opinion.



So two questions, pertaining only to the oil hoses. What's the problem with continuing to use lined silicone hoses for the oil? What specification do you recommend for the rubber oil hoses, which I hope to purchase from a local automotive parts supplier?

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Burrilla

Joined: 25 Apr 2015
Posts: 187

Posted: Sat Jan 04, 2025 4:34 am Post subject: Oil and water hoses

Not aware of anyone who has used silicone for oil hoses. Lots of people have silicone water hoses, including me, and life certainly better than 5 years in my experience. I also have silicone hose for the fuel filler and carb to air box which are fuel resistant.



I would start by looking at the ROTAX documents for hose specification, especially looking at pressure range, heat and oil, hydrocarbon, protection.

I have seen a silicone water hose damaged by external heat from exhaust.

A good source of info is the motorsport suppliers like 

Samco silicone Hoses, Kits, Clip Kits, Classic & Xtreme at Merlin Motorsport

merlinmotorsport.co.uk



[img]cid:C26ADA10-5A35-4410-A88D-A865C287E575[/img]



Silicone hoses have developed well but not sure about oil on an engine side or the fuel lines either.

If you are UK also you could consult the LAA on their thoughts.

Good luck.

Alan Burrill

Sent from my iPad



 	  Quote: 	
		  On 3 Jan 2025, at 17:10, JonathanMilbank <jdmilbank(at)yahoo.co.uk> wrote:



--> Europa-List message posted by: "JonathanMilbank" <jdmilbank(at)yahoo.co.uk>



Several years ago I bought a set of silicone hoses from someone in Sweden who created shaped coolant hoses for the Europa and also provided silicone hoses with protective lining for the oil system. He no longer makes or provides these items. Someone, but I can't remember who, stated that these hoses would last at least twice as long as the rubber types and I have no reason to doubt that.



However my engine is currently off the aircraft, so a fellow pilot who has a minor share of the aircraft would like the oil hoses to be replaced by rubber originals, even though the silicone looks and feels supple, as good as new! I would prefer to continue with silicone, because the recommendation is to replace ALL rubber items every 5 years. The oil hoses are the difficult ones to access, particularly the return line from the crankcase. But I must also consider my friend's opinion.



So two questions, pertaining only to the oil hoses. What's the problem with continuing to use lined silicone hoses for the oil? What specification do you recommend for the rubber oil hoses, which I hope to purchase from a local automotive parts supplier?





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=515189#515189

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Duncan McFadyean

Joined: 18 Jan 2011
Posts: 222

Posted: Sun Jan 05, 2025 2:00 am Post subject: Oil and water hoses

<<....What's the problem with continuing to use lined silicone hoses for the oil? ...>>   

           

       One reason would be that the polyester reinforcement used in normal silicone hoses will let go at the temperatures that can be seen by the oil (in the return especially and feed too before the oil cooler).   

       It is possible to get silicone hose with Nomex as the reinforcement fibre; I've used these successfully in place of the 1" cylinder head water hoses on the bottom of the engine.    

           

       Duncan McF   

    	  Quote: 	
		           On 04/01/2025 12:33 GMT Alan Burrill <alanb(at)dpy01.co.uk> wrote:    

              

              

 Not aware of anyone who has used silicone for oil hoses. Lots of people have silicone water hoses, including me, and life certainly better than 5 years in my experience. I also have silicone hose for the fuel filler and carb to air box which are fuel resistant.               

         I would start by looking at the ROTAX documents for hose specification, especially looking at pressure range, heat and oil, hydrocarbon, protection.    

              

         I have seen a silicone water hose damaged by external heat from exhaust.    

              

         A good source of info is the motorsport suppliers like     

              

                                                                                                                                                                     Samco silicone Hoses, Kits, Clip Kits, Classic & Xtreme at Merlin Motorsport                 

                                   merlinmotorsport.co.uk                 

                

               [img]cid:C26ADA10-5A35-4410-A88D-A865C287E575[/img]                                                                        

     

                 

           Silicone hoses have developed well but not sure about oil on an engine side or the fuel lines either.     

                 

           If you are UK also you could consult the LAA on their thoughts.     

                 

           Good luck.     

                 

           Alan Burrill     

                Sent from my iPad     

           

       	  Quote: 	
		         On 3 Jan 2025, at 17:10, JonathanMilbank <jdmilbank(at)yahoo.co.uk> wrote:        

       

                   --> Europa-List message posted by: "JonathanMilbank" <jdmilbank(at)yahoo.co.uk>        

       

        Several years ago I bought a set of silicone hoses from someone in Sweden who created shaped coolant hoses for the Europa and also provided silicone hoses with protective lining for the oil system. He no longer makes or provides these items. Someone, but I can't remember who, stated that these hoses would last at least twice as long as the rubber types and I have no reason to doubt that.        

       

        However my engine is currently off the aircraft, so a fellow pilot who has a minor share of the aircraft would like the oil hoses to be replaced by rubber originals, even though the silicone looks and feels supple, as good as new! I would prefer to continue with silicone, because the recommendation is to replace ALL rubber items every 5 years. The oil hoses are the difficult ones to access, particularly the return line from the crankcase. But I must also consider my friend's opinion.        

       

        So two questions, pertaining only to the oil hoses. What's the problem with continuing to use lined silicone hoses for the oil? What specification do you recommend for the rubber oil hoses, which I hope to purchase from a local automotive parts supplier?        

       

       

       

       

        Read this topic online here:        

       

        http://forums.matronics.com/viewtopic.php?p=515189#515189        

       

       

       

       

       

       

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