---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Sun 02/26/06: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:11 AM - Re: RPM vs MP (Dave Grosvenor - DreamWings) 2. 08:46 AM - 901 Engine Starter Engaged with Spark Plug Wire Disconnected (WAYNE BEATTIE) 3. 09:02 AM - Re: 901 Engine Starter Engaged with Spark Plug Wire Disconnected (ivor.phillips) 4. 03:49 PM - Re: rpm (JetPilot) 5. 03:56 PM - Re: Re: rpm (Gilles Thesee) 6. 03:56 PM - Re: Re: rpm (Duncan McFadyean) 7. 05:04 PM - Re: rpm (David X) ________________________________ Message 1 _____________________________________ Time: 07:11:27 AM PST US From: "Dave Grosvenor - DreamWings" Subject: Re: RotaxEngines-List: RPM vs MP --> RotaxEngines-List message posted by: "Dave Grosvenor - DreamWings" Thanks to all for the input, that is the sort of info I was looking for. Dave ________________________________ Message 2 _____________________________________ Time: 08:46:01 AM PST US From: WAYNE BEATTIE Subject: RotaxEngines-List: 901 Engine Starter Engaged with Spark Plug Wire Disconnected By accident I engaged the starter of my 912 UL for several seconds with the spark plug wires disconnected from the plugs. Now I fear I may have damaged the ignition circuitry. Has anyone done this and what was the result? The L.E.A.F. Catalogue shows a piece of equipment that it says allows you to turn the engine over with the plug wires disconnected from the plugs. It does not show up on the website and when I call they have no listing on their computer. Has anyone heard of this being used? Wayne ________________________________ Message 3 _____________________________________ Time: 09:02:16 AM PST US From: "ivor.phillips" Subject: Re: RotaxEngines-List: 901 Engine Starter Engaged with Spark Plug Wire Disconnected Assuming you have a key switch and not toggles, then there is a slim chance that the Ignition modules have been damaged, They are quite robust so you may be OK! connect every thing back up and test, Ivor Phillips ----- Original Message ----- From: WAYNE BEATTIE To: RotaxEngines-List Digest Server Sent: Sunday, February 26, 2006 4:45 PM Subject: RotaxEngines-List: 901 Engine Starter Engaged with Spark Plug Wire Disconnected By accident I engaged the starter of my 912 UL for several seconds with the spark plug wires disconnected from the plugs. Now I fear I may have damaged the ignition circuitry. Has anyone done this and what was the result? The L.E.A.F. Catalogue shows a piece of equipment that it says allows you to turn the engine over with the plug wires disconnected from the plugs. It does not show up on the website and when I call they have no listing on their computer. Has anyone heard of this being used? Wayne ________________________________ Message 4 _____________________________________ Time: 03:49:58 PM PST US Subject: RotaxEngines-List: Re: rpm From: "JetPilot" --> RotaxEngines-List message posted by: "JetPilot" So does that mean that using a lower RPM like 4800 on a 912-S for cruise is bad ????? -------- NO FEAR - If you have no fear you did not go as fast as you could have !!! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=15202#15202 ________________________________ Message 5 _____________________________________ Time: 03:56:24 PM PST US From: Gilles Thesee Subject: Re: RotaxEngines-List: Re: rpm --> RotaxEngines-List message posted by: Gilles Thesee JetPilot a crit : >--> RotaxEngines-List message posted by: "JetPilot" > >So does that mean that using a lower RPM like 4800 on a 912-S for cruise is bad ????? > > > Hi JetPilot, Better follow the engine manufacturer recommendations. You may wish to download the Operator's Manual. All the tables are in it. As a rule, to insure the best specific consumption, you run at the highest manifold pressure, and the lowest RPM compatible with engine reliability. 4800 RPM seems quite right for circa 65-75% power. Regards, Gilles Thesee Grenoble, France http://contrails.free.fr ________________________________ Message 6 _____________________________________ Time: 03:56:49 PM PST US From: "Duncan McFadyean" Subject: Re: RotaxEngines-List: Re: rpm --> RotaxEngines-List message posted by: "Duncan McFadyean" Why would reducing both mechanical stress and thermal stress be bad? Duncan Mcf. ----- Original Message ----- From: "JetPilot" Sent: Sunday, February 26, 2006 11:48 PM Subject: RotaxEngines-List: Re: rpm > --> RotaxEngines-List message posted by: "JetPilot" > > > So does that mean that using a lower RPM like 4800 on a 912-S for cruise > is bad ????? > > -------- > NO FEAR - If you have no fear you did not go as fast as you > could have !!! > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=15202#15202 > > > ________________________________ Message 7 _____________________________________ Time: 05:04:39 PM PST US Subject: RotaxEngines-List: Re: rpm From: "David X" --> RotaxEngines-List message posted by: "David X" The only "bad" RPM settings that are evident from available documentation/bulletins are exceeding 5500 for more than 5 minutes, or running below 2000 RPM for extended periods; which may cause gear box "chatter". Max cruise power will give you most speed, 65% power will give you better economy and range, 75% power will give you the happy medium between speed and economy. I really don't know if running an engine mostly at 65% power vs. 75% will make it last longer or not. Theoretically, perhaps. I think the greater factors to long life have to do with running MOGAS instead of AVGAS, changing the oil every 50 hours instead of every 100, keeping the carbs tuned, keeping the fliters and plugs clean etc. Maybe someone who has worn out a few Rotax 912 might have more authoritative opinion. -------- Zodiac 601 XL - CZAW Built - Rotax 912S DO NOT ARCHIVE Read this topic online here: http://forums.matronics.com/viewtopic.php?p=15213#15213