---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Mon 02/23/09: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:06 AM - Re: Mitsubishi Turbo on a rotax 912 (K Dilks) 2. 03:17 PM - ROTAX 914 LOW OIL PRESSURE (ROBERT LINDSAY) 3. 04:20 PM - Re: ROTAX 914 LOW OIL PRESSURE (pjeffers@talktalk.net) 4. 04:25 PM - Re: ROTAX 914 LOW OIL PRESSURE (Roger Lee) 5. 04:41 PM - Re: ROTAX 914 LOW OIL PRESSURE (Ivan) 6. 06:04 PM - Re: ROTAX 914 LOW OIL PRESSURE (Paul McAllister) 7. 08:04 PM - Re: ROTAX 914 LOW OIL PRESSURE (ROBERT LINDSAY) 8. 08:13 PM - Re: ROTAX 914 LOW OIL PRESSURE (ROBERT LINDSAY) ________________________________ Message 1 _____________________________________ Time: 01:06:52 AM PST US Subject: RotaxEngines-List: Re: Mitsubishi Turbo on a rotax 912 From: "K Dilks" I think you are missing the reasons for the tcu and the difference in price. TCU is needed to allow the engine to operate without risk of over boost at low altitudes but still develop a full 100 hp at 15,000 ft. A wast gate does not work well enough. Secondly the price is high but the exhaust , engine mount and air box are standard fit, so add that cost in to the equation. Power cost money.......just ask Obama LOL -------- Austria ............. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=231621#231621 ________________________________ Message 2 _____________________________________ Time: 03:17:19 PM PST US From: "ROBERT LINDSAY" Subject: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE Recently I had the need to climb to FL180 on a below standard temp day. Oi l press in Rotax 914 UL3 (ser 4417756, 475 hrs) has always been normal, but on this occasion while climbing 34 inches 5500 rpm thru 15000 ft, oil pres sure began decreasing (OAT was 10 deg below stnd). At 18000 ft Grand Rapid s EIS oil pressure alarmed at 25 psi. Power was retarded to below 65 perce nt and descent commenced. Oil pressure returned to normal (about 50 psi) b elow 15 Kft where OAT was near stnd. Flight continued at 12Kft at 75 perce nt power, all engine parameters indicating normal. Oil quantity checked after landing indicated near full. Oil is Honda GN-4 10W40. Oil pressure on several flights since (altitude below 10 Kft) has b een normal. Why would oil pressure drop under the above conditions? I suspect a sensin g/indication problem. Thanx, all. Bob Lindsay, Europa XS monogear N77EU, San Diego CA ________________________________ Message 3 _____________________________________ Time: 04:20:36 PM PST US Subject: Re: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE From: pjeffers@talktalk.net Hi Bob, The one piece of info you did not supply was what was the oil temp at this time?? You had apparently been climbing at max continuous for quite a while which inevitably gets the oil pretty warm.? My experience would indicate that even if the temp stays within limits (just) it will result in a significant reduction in oil pressure also within limits (just).? I suspect you are seeing a normal consequence of high oil temp. A higher air speed in climb or better cooling or both would probably have prevented the potential problem. Pete Jeffers -----Original Message----- From: ROBERT LINDSAY Sent: Mon, 23 Feb 2009 18:14 Subject: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE Recently I had the need to climb to FL180 on a below standard temp day.? Oil press in Rotax 914 UL3 (ser 4417756, 475 hrs) has always been normal, but on this occasion while climbing 34 inches 5500 rpm thru 15000 ft, oil pressure began decreasing (OAT was 10 deg below stnd).? At 18000 ft Grand Rapids EIS oil pressure alarmed at 25 psi.? Power was retarded to below 65 percent and descent commenced.? Oil pressure returned to normal (about 50 psi) below 15 Kft where OAT was near stnd.? Flight continued at 12Kft at 75 percent power, all engine parameters indicating normal. ? Oil quantity checked after landing indicated near full.? Oil is Honda GN-4 10W40.? Oil pressure on several flights since (altitude below 10 Kft) has been normal. ? Why would oil pressure drop under the above conditions?? I suspect a sensing/indication problem. ? Thanx, all.? Bob Lindsay, Europa XS monogear N77EU, San Diego CA ________________________________ Message 4 _____________________________________ Time: 04:25:01 PM PST US Subject: RotaxEngines-List: Re: ROTAX 914 LOW OIL PRESSURE From: "Roger Lee" Most of these oil pressure issues tend to be sending units or bad grounds. If you really lose oil pressure you'll have some other serious issues to contend with. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Service Center 520-574-1080 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=231712#231712 ________________________________ Message 5 _____________________________________ Time: 04:41:09 PM PST US From: "Ivan" Subject: Re: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE As long as the oil is withing limits (as opposed to being "hot") I would assume that the pressure would be fine. After all is not that the function of the pressure regulator? Ivan ----- Original Message ----- From: pjeffers@talktalk.net To: rotaxengines-list@matronics.com Sent: Monday, February 23, 2009 5:19 PM Subject: Re: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE Hi Bob, The one piece of info you did not supply was what was the oil temp at this time? You had apparently been climbing at max continuous for quite a while which inevitably gets the oil pretty warm. My experience would indicate that even if the temp stays within limits (just) it will result in a significant reduction in oil pressure also within limits (just). I suspect you are seeing a normal consequence of high oil temp. A higher air speed in climb or better cooling or both would probably have prevented the potential problem. Pete Jeffers -----Original Message----- From: ROBERT LINDSAY To: rotaxengines-list@matronics.com Sent: Mon, 23 Feb 2009 18:14 Subject: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE Recently I had the need to climb to FL180 on a below standard temp day. Oil press in Rotax 914 UL3 (ser 4417756, 475 hrs) has always been normal, but on this occasion while climbing 34 inches 5500 rpm thru 15000 ft, oil pressure began decreasing (OAT was 10 deg below stnd). At 18000 ft Grand Rapids EIS oil pressure alarmed at 25 psi. Power was retarded to below 65 percent and descent commenced. Oil pressure returned to normal (about 50 psi) below 15 Kft where OAT was near stnd. Flight continued at 12Kft at 75 percent power, all engine parameters indicating normal. Oil quantity checked after landing indicated near full. Oil is Honda GN-4 10W40. Oil pressure on several flights since (altitude below 10 Kft) has been normal. Why would oil pressure drop under the above conditions? I suspect a sensing/indication problem. Thanx, all. Bob Lindsay, Europa XS monogear N77EU, San Diego CA ________________________________ Message 6 _____________________________________ Time: 06:04:29 PM PST US From: Paul McAllister Subject: Re: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE Hi Bob, One possibility is that you are getting oil foaming at altitude. I seem to recall John Hurst back in the days he was at Europa that he had a problem w ith some oils doing this.- I can't remember which oil he had the most trouble with, but I seem to reca ll that he got good results with Valvoline Durablend.- Paul --- On Mon, 2/23/09, ROBERT LINDSAY wrote: From: ROBERT LINDSAY Subject: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE Recently I had the need to climb to FL180 on a below standard temp day.- Oil press in Rotax 914 UL3 (ser 4417756, 475 hr s) has always been normal, but on this occasion while climbing 34 inches 5500 rpm thru 15000 ft, oil pressure began decreasing (OAT was 10 deg below stnd). - At 18000 ft Grand Rapids EIS oil pressure alarmed at 25 psi.- Power was retarded to below 65 percent and descent commenced.- Oil pressure returne d to normal (about 50 psi) below 15 Kft where OAT was near stnd.- Flight continued at 12Kft at 75 percent power, all engine parameters indicating normal. - Oil quantity checked after landing indicated near full.- Oil is Honda GN-4 10W40.- Oil pressure on several flights since (altitude below 10 Kft) has been normal. - Why would oil pressure drop under the above conditions?- I suspect a sensing/indication problem. - Thanx, all.- Bob Lindsay, Europa XS monogear N77EU, San Diego CA =0A=0A=0A ________________________________ Message 7 _____________________________________ Time: 08:04:55 PM PST US From: "ROBERT LINDSAY" Subject: Re: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE Oil temp during my cruise climb of 100 KIAS was actually a little cool at a bout 160 to 170F. ----- Original Message ----- From: pjeffers@talktalk.net To: rotaxengines-list@matronics.com Sent: Monday, February 23, 2009 4:19 PM Subject: Re: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE Hi Bob, The one piece of info you did not supply was what was the oil temp at thi s time? You had apparently been climbing at max continuous for quite a whi le which inevitably gets the oil pretty warm. My experience would indicate that even if the temp stays within limits (just) it will result in a signi ficant reduction in oil pressure also within limits (just). I suspect you are seeing a normal consequence of high oil temp. A higher air speed in cli mb or better cooling or both would probably have prevented the potential pr oblem. Pete Jeffers -----Original Message----- From: ROBERT LINDSAY To: rotaxengines-list@matronics.com Sent: Mon, 23 Feb 2009 18:14 Subject: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE Recently I had the need to climb to FL180 on a below standard temp day. Oil press in Rotax 914 UL3 (ser 4417756, 475 hrs) has always been normal, b ut on this occasion while climbing 34 inches 5500 rpm thru 15000 ft, oil pr essure began decreasing (OAT was 10 deg below stnd). At 18000 ft Grand Rap ids EIS oil pressure alarmed at 25 psi. Power was retarded to below 65 per cent and descent commenced. Oil pressure returned to normal (about 50 psi) below 15 Kft where OAT was near stnd. Flight continued at 12Kft at 75 per cent power, all engine parameters indicating normal. Oil quantity checked after landing indicated near full. Oil is Honda GN- 4 10W40. Oil pressure on several flights since (altitude below 10 Kft) has been normal. Why would oil pressure drop under the above conditions? I suspect a sens ing/indication problem. Thanx, all. Bob Lindsay, Europa XS monogear N77EU, San Diego CA ________________________________ Message 8 _____________________________________ Time: 08:13:15 PM PST US From: "ROBERT LINDSAY" Subject: Re: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE I don't know what actually causes oil to foam. Honda GN-4 was recommended by Rotax rep Eric Tucker. I plan on trying to repeat the situation on a fo rthcoming high altitude flight. ----- Original Message ----- From: Paul McAllister To: rotaxengines-list@matronics.com Sent: Monday, February 23, 2009 6:02 PM Subject: Re: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE Hi Bob, One possibility is that you are getting oil foaming at altitude. I seem to recall John Hurst back in the days he was at Europa that he had a p roblem with some oils doing this. I can't remember which oil he had the most trouble with, but I seem to recall that he got good results with Valvoline Durablend. Paul --- On Mon, 2/23/09, ROBERT LINDSAY wrote: From: ROBERT LINDSAY Subject: RotaxEngines-List: ROTAX 914 LOW OIL PRESSURE To: rotaxengines-list@matronics.com Date: Monday, February 23, 2009, 5:14 PM Recently I had the need to climb to FL180 on a below standard tem p day. Oil press in Rotax 914 UL3 (ser 4417756, 475 hrs) has always been n ormal, but on this occasion while climbing 34 inches 5500 rpm thru 15000 ft , oil pressure began decreasing (OAT was 10 deg below stnd). At 18000 ft G rand Rapids EIS oil pressure alarmed at 25 psi. Power was retarded to belo w 65 percent and descent commenced. Oil pressure returned to normal (about 50 psi) below 15 Kft where OAT was near stnd. Flight continued at 12Kft a t 75 percent power, all engine parameters indicating normal. Oil quantity checked after landing indicated near full. Oil is H onda GN-4 10W40. Oil pressure on several flights since (altitude below 10 Kft) has been normal. Why would oil pressure drop under the above conditions? I suspec t a sensing/indication problem. font face="Arial" size="2">Thanx, all. Bob Lindsay, Europa X S monogear N77EU, San Diego CA ------------------------------------------------------------------------------------- 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.