---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Sun 12/09/07: 11 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:49 AM - Re: Oil pressure (Carlos Trigo) 2. 03:14 AM - Re: Oil pressure (Gilles Thesee) 3. 05:32 AM - Re: Oil pressure (Carlos Trigo) 4. 07:03 AM - Re: Oil pressure (Roger Lee) 5. 07:04 AM - Re: Etanol Mandate for aAll Fuel in State (John M. Goodings) 6. 08:02 AM - 912 EFI kit (paul wilson) 7. 09:01 AM - Re: 912 EFI kit (Gilles Thesee) 8. 10:03 AM - Re: 912 EFI kit (paul wilson) 9. 10:39 AM - Re: 912 EFI kit (Gilles Thesee) 10. 08:11 PM - Re: 912ULS and XCOM760 Problem (rampil) 11. 08:14 PM - Re: Oil pressure (rampil) ________________________________ Message 1 _____________________________________ Time: 02:49:58 AM PST US From: "Carlos Trigo" Subject: RE: RotaxEngines-List: Oil pressure Merci Gilles Thanks Roger I read those numbers in the Manual, but they also state 4 bar as "nominal pressure", which I'm not sure what exactly means. So, anything above 1.5 bar and below 5 bar would be safe. Why this can be so variable? What exactly causes the differences in oil pressure between engines? Carlos ________________________________ Message 2 _____________________________________ Time: 03:14:22 AM PST US From: Gilles Thesee Subject: Re: RotaxEngines-List: Oil pressure Carlos Trigo a crit : > So, anything above 1.5 bar and below 5 bar would be safe. > Why this can be so variable? > What exactly causes the differences in oil pressure between engines? > Carlos, Oil pressure is dependent on - engine : RPM, relief valve setting, clearances in the engine, etc. - oil viscosity : oil grade, temperature, pollution. Some engine measure pressure upstream at the pump outlet, others downstream of the the oil galleries. Best regards, -- Gilles http://contrails.free.fr ________________________________ Message 3 _____________________________________ Time: 05:32:01 AM PST US From: "Carlos Trigo" Subject: RE: RotaxEngines-List: Oil pressure > > Oil pressure is dependent on > - engine : RPM, relief valve setting, clearances in the engine, etc. > - oil viscosity : oil grade, temperature, pollution. > > > Some engine measure pressure upstream at the pump outlet, others > downstream of the the oil galleries. > OK, now I got it! How good is the feeling of learning ... Merci de nouveau, Gilles Carlos ________________________________ Message 4 _____________________________________ Time: 07:03:40 AM PST US Subject: RotaxEngines-List: Re: Oil pressure From: "Roger Lee" Hi Carlos, Gilles is exactly right. Most 912's I have seen run between 40-55 psi normally. On another note I was running an oil pressure when new at around 55 psi and after a while (6-7 months) I was running 41 psi. I prefer my oil pressure higher just to help make sure it does a good lubrication job in the tight tolerance areas and in case things within the engine got too close to operational maximums. I put a Rotax shim under the oil pressure control spring. This didn't help at all. I checked the pressure in the system with a gauge and found with the shim my oil pressure sender was reading 20 psi low. I replaced the oil pressure sender with a new one and now I am at 58-60 psi under normal running rpm. Moral to the story is if you oil pressure seems too low then you might want to check it with a manual pressure gauge or at least against another known good oil pressure sender. Oil pressure senders on the 912's do occasionally go bad due to vibration. If you are in the experimental class then a remote mount of the sender is not a bad idea and very easy. I am in the SLSA class in the USA and can not legally do that without permission from the manufacturer. -------- Roger Lee Tucson, Az. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=151293#151293 ________________________________ Message 5 _____________________________________ Time: 07:04:44 AM PST US From: "John M. Goodings" Subject: RotaxEngines-List: Re: Etanol Mandate for aAll Fuel in State My apologies! Thom Riddle quite rightly pointed out to me that I meant ETHANOL, not METHANOL, in my post about alcohol additives to autogas in Canada. Sorry. John Goodings, C-FGPJ, CH601HD with R912S, Carp/Ottawa, Toronto/Waterloo. ________________________________ Message 6 _____________________________________ Time: 08:02:16 AM PST US From: paul wilson Subject: RotaxEngines-List: 912 EFI kit Interesting From another list Looking forward to hearing about the success of the kit and all the changes required. http://www.sdsefi.com/aircraft.html You need to scroll down the page for the announcement. I have no affiliation with these people Regards, Paul ________________________________ Message 7 _____________________________________ Time: 09:01:32 AM PST US From: Gilles Thesee Subject: Re: RotaxEngines-List: 912 EFI kit paul wilson a crit : > http://www.sdsefi.com/aircraft.html > You need to scroll down the page for the announcement. Paul, Please note that adding electronic fuel injection to an engine means adding dependence on electricity. > The extra current draw of the electric fuel pump, ECU and injectors > comes to around 7-9 amps. Operation with the existing internal 20 amp > alternator will demand that other normal electrical loads don't exceed > 8-10 amps And considering the standard Rotax regulator cannot supply more than 12-14 amps continuous without tending to self destruct, there is not much left for the ordinary appliances and battery on board. The maximum regulator momentary output is in the vicinity of 18 amps. Regards, -- Gilles Thesee Grenoble, France http://contrails.free.fr ________________________________ Message 8 _____________________________________ Time: 10:03:51 AM PST US From: paul wilson Subject: Re: RotaxEngines-List: 912 EFI kit True Rotax has minimal electrical power. To bad. The fix would be a proper alternator, then use the Rotax one for backup with just essential items on line. There are more than one add-on alternator kits available for the 912. I probably will need one anyway. The EFI does add more complexity with a required high pressure pump or two and return line and who knows what else. It would be nice to modernize the engine. BTW, I read about a lot of regulator failures, but have not read about the stator generator failures. Paul =========== At 08:59 AM 12/9/2007, you wrote: >Thesee > >paul wilson a crit : >>http://www.sdsefi.com/aircraft.html >>You need to scroll down the page for the announcement. > >Paul, >Please note that adding electronic fuel >injection to an engine means adding dependence on electricity. >>The extra current draw of the electric fuel >>pump, ECU and injectors comes to around 7-9 >>amps. Operation with the existing internal 20 >>amp alternator will demand that other normal >>electrical loads don't exceed 8-10 amps >And considering the standard Rotax regulator >cannot supply more than 12-14 amps continuous >without tending to self destruct, there is not >much left for the ordinary appliances and battery on board. >The maximum regulator momentary output is in the vicinity of 18 amps. > > >Regards, >-- >Gilles Thesee >Grenoble, France >http://contrails.free.fr > > ________________________________ Message 9 _____________________________________ Time: 10:39:10 AM PST US From: Gilles Thesee Subject: Re: RotaxEngines-List: 912 EFI kit paul wilson a crit : > > It would be nice to modernize the engine. Adding complexity is justified only for correcting some defect. Not sure whether the 912 really is in need of fuel injection. > > BTW, I read about a lot of regulator failures, but have not read > about the stator generator failures. The stator itself is very robust. It took a lot of abuse when we bench tested it : http://contrails.free.fr/elec_ducati.php Best regards, -- Gilles http://contrails.free.fr ________________________________ Message 10 ____________________________________ Time: 08:11:39 PM PST US Subject: RotaxEngines-List: Re: 912ULS and XCOM760 Problem From: "rampil" Gee Tom, I don't know what other vendors you use with your aircraft, but a month for radio repair all the way to Oz seems pretty short to me. I just waited three months for delivery of equipment that was "in stock" when I purchased it! Yes, I was grounded the whole time. I suggest relaxing a bit, after all, this is a hobby we choose to reduce stress on the ground ;-) Ira FAA AME Read this topic online here: http://forums.matronics.com/viewtopic.php?p=151400#151400 ________________________________ Message 11 ____________________________________ Time: 08:14:27 PM PST US Subject: RotaxEngines-List: Re: Oil pressure From: "rampil" Carlos, Nominal means perfect. More or less! Ira Read this topic online here: http://forums.matronics.com/viewtopic.php?p=151401#151401 ------------------------------------------------------------------------------------- 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.