---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Fri 05/29/09: 9 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:12 AM - Re: Low oil temps on 912ULSLow oil temps on 912ULS (Catz631@aol.com) 2. 07:44 AM - Re: EGT Temps (rampil) 3. 07:59 AM - Re: Low oil temps on 912ULS (rampil) 4. 08:01 AM - Re: Low oil temps on 912ULS (Goodone) 5. 01:10 PM - Re: Re: Low oil temps on 912ULS (Graham Singleton) 6. 02:49 PM - Re: Low oil temps on 912ULS (lucien) 7. 03:29 PM - Re: Low oil temps on 912ULS (Noel) 8. 05:24 PM - Re: Re: Low oil temps on 912ULS (Noel) 9. 07:28 PM - Re: Re: Low oil temps on 912ULS (Matt Tucciarone) ________________________________ Message 1 _____________________________________ Time: 05:12:51 AM PST US From: Catz631@aol.com Subject: Re: RotaxEngines-List: Low oil temps on 912ULSLow oil temps on 912ULS Lowell Fitt at _highwingllc.com_ (highwingllc.com) makes a very nice set of cockpit controllable shutters for both the oil cooler and radiator. I have them on my Kitfox and they work well. Dick Maddux Kitfox 4-120 0 Rotax 912 UL Milton,Fl **************Discover the variety of Bisquick=AE mix. Get Recipes & Savin gs Now. =http:%2F%2Fad.doubleclick.net%2Fclk%3B215225813%3B37274670%3Be%3Fhttp:% 2F%2 Frecipes.bisquick.bettycrocker.com%3FESRC%3D971) ________________________________ Message 2 _____________________________________ Time: 07:44:30 AM PST US Subject: RotaxEngines-List: Re: EGT Temps From: "rampil" Hi Ron, I was just pointing out that most Rotax drivers are probably better off without EGTs than they would be with. I say that as a quant who has 4 EGTs, 6 CHTs (two duplicates to compare plug rings with Rotax probes) and coolant and carb temps. Ira -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=245887#245887 ________________________________ Message 3 _____________________________________ Time: 07:59:10 AM PST US Subject: RotaxEngines-List: Re: Low oil temps on 912ULS From: "rampil" Hi Matt, Actually the temp needs to touch and exceed 212F for some time after each flight. Usually on the ground after engine off. The reason is that water is a product of combustion of gasoline and if left in the oil will hasten corrosion. It needs to boil out. Remember the boiling point of water at the normal operation oil pressure is much higher than the safe temp of the rotax alloy in the heads, so the boiling usually, occurs when the engine stops. At 4 atm (60 psi) the boiling point of pure water is about 300C! -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=245891#245891 ________________________________ Message 4 _____________________________________ Time: 08:01:11 AM PST US Subject: RotaxEngines-List: Re: Low oil temps on 912ULS From: "Goodone" My engine is a 912UL on a Skyranger and the oil temp in it also runs cool. I normally cover my oil radiator with aluminum tape and only remove it when the temperatures here in Maryland get really hot in the summer. During the winter I add a layer of insulation to the tape. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=245893#245893 ________________________________ Message 5 _____________________________________ Time: 01:10:02 PM PST US From: Graham Singleton Subject: Re: RotaxEngines-List: Re: Low oil temps on 912ULS rampil wrote: > Remember the boiling point of > water at the normal operation oil pressure is much higher than the safe > temp of the rotax alloy in the heads, so the boiling usually, occurs when > the engine stops. > > At 4 atm (60 psi) the boiling point of pure water is about 300C! > > -------- > Ira N224XS Ira I suspect you taught a lot of us something we had not thought through. Very good point. ________________________________ Message 6 _____________________________________ Time: 02:49:53 PM PST US Subject: RotaxEngines-List: Re: Low oil temps on 912ULS From: "lucien" grahamsingleton(at)btinte wrote: > rampil wrote: > > > Remember the boiling point of > > water at the normal operation oil pressure is much higher than the safe > > temp of the rotax alloy in the heads, so the boiling usually, occurs when > > the engine stops. > > > > At 4 atm (60 psi) the boiling point of pure water is about 300C! > > > > -------- > > Ira N224XS > > Ira > > > > I suspect you taught a lot of us something we had not thought through. > Very good point. Well remember water evaporates readily at lower temperatures than the boiling point. You don't have to boil it to "burn" it off. You pretty much only have to get the engine and oil hot enough to actually get it all evaporated before it gets too cold again to do so. Whether that's 212F, tho, I dunno. I look at the oil cap after the engine cools down, there's usually a little condensation on it if I didn't run the engine long enough to get it hot enough to burn off all the moisture. As for the oil temp, I too have an oil thermostat installed on mine and it helps keep the temps up quite a bit. There are times in the winter tho where even that won't allow it to get to 180+. I"ve landed and put it away a few times in the very cold weather because I still couldn't get the oil temps over 160 or something like that without just really running the motor too hard. LS -------- LS Titan II SS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=245960#245960 ________________________________ Message 7 _____________________________________ Time: 03:29:23 PM PST US From: "Noel" Subject: RE: RotaxEngines-List: Low oil temps on 912ULS Sound to me like a set of Lowell's shutters would be right up your alley. Open then in the climb and close them to cruise in warmer weather. Noel -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Les Goldner Sent: 28 May 2009 08:01 PM Subject: RotaxEngines-List: Low oil temps on 912ULS I fly a Zenith CH701 with a 912 ULS engine and my oil temps are running low. Rotax says the operating temps should be between 190 and 230-degrees F. My normal temps with 60-degree outside air run about 130-degrees at about 4800-RPM. I only get in the "normal" range when running near full RPM, about 5250 with my prop setting. I mostly use 91 octane mogas and CPS's semi-synthetic AV-9 motor oil (which is supposed to be designed especially for the 912). Should I be concerned that the oil temps run below the normal range? Les ________________________________ Message 8 _____________________________________ Time: 05:24:20 PM PST US From: "Noel" Subject: RE: RotaxEngines-List: Re: Low oil temps on 912ULS Remember your lubrication system isn't sealed and under pressure like the cooling system. Noel -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of lucien Sent: 29 May 2009 07:19 PM Subject: RotaxEngines-List: Re: Low oil temps on 912ULS grahamsingleton(at)btinte wrote: > rampil wrote: > > > Remember the boiling point of > > water at the normal operation oil pressure is much higher than the safe > > temp of the rotax alloy in the heads, so the boiling usually, occurs when > > the engine stops. > > > > At 4 atm (60 psi) the boiling point of pure water is about 300C! > > > > -------- > > Ira N224XS > > Ira > > > > I suspect you taught a lot of us something we had not thought through. > Very good point. Well remember water evaporates readily at lower temperatures than the boiling point. You don't have to boil it to "burn" it off. You pretty much only have to get the engine and oil hot enough to actually get it all evaporated before it gets too cold again to do so. Whether that's 212F, tho, I dunno. I look at the oil cap after the engine cools down, there's usually a little condensation on it if I didn't run the engine long enough to get it hot enough to burn off all the moisture. As for the oil temp, I too have an oil thermostat installed on mine and it helps keep the temps up quite a bit. There are times in the winter tho where even that won't allow it to get to 180+. I"ve landed and put it away a few times in the very cold weather because I still couldn't get the oil temps over 160 or something like that without just really running the motor too hard. LS -------- LS Titan II SS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=245960#245960 ________________________________ Message 9 _____________________________________ Time: 07:28:44 PM PST US From: "Matt Tucciarone" Subject: RE: RotaxEngines-List: Re: Low oil temps on 912ULS I have never heard that. I was told that 190 would burn out the water in the engine that would condensate in it. And it would make sense that 190 number was correct because my thermostat keeps the oil between 190 and 200. Again I have never heard that it has to be about 212. -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of rampil Sent: Friday, May 29, 2009 10:59 AM Subject: RotaxEngines-List: Re: Low oil temps on 912ULS Hi Matt, Actually the temp needs to touch and exceed 212F for some time after each flight. Usually on the ground after engine off. The reason is that water is a product of combustion of gasoline and if left in the oil will hasten corrosion. It needs to boil out. Remember the boiling point of water at the normal operation oil pressure is much higher than the safe temp of the rotax alloy in the heads, so the boiling usually, occurs when the engine stops. At 4 atm (60 psi) the boiling point of pure water is about 300C! -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=245891#245891 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.