Kitfox-List Digest Archive

Tue 10/26/10


Total Messages Posted: 14



Today's Message Index:
----------------------
 
     1. 07:08 AM - Re: Follow me on Spot tomorrow to Yuma, AZ (Roger Lee)
     2. 09:53 AM - Re: engine quit due to ethanol (bjones@dmv.com)
     3. 10:23 AM - Re: engine quit due to ethanol (Pete Christensen)
     4. 11:27 AM - Re: Re: Follow me on Spot tomorrow to Yuma, AZ (Pete Christensen)
     5. 01:05 PM - Re: EGT's & Oil Temp (JetPilot)
     6. 01:07 PM - Rotax 912 Series Engine Cruise RPM's (JetPilot)
     7. 01:33 PM - Re: engine quit due to ethanol (Roger Lee)
     8. 01:43 PM - Re: EGT's & Oil Temp (Roger Lee)
     9. 02:00 PM - Re: Rotax 912 Series Engine Cruise RPM's (Roger Lee)
    10. 03:06 PM - Re: Re: engine quit due to ethanol (Pete Christensen)
    11. 05:14 PM - Re: Rotax 912 Series Engine Cruise RPM's (JetPilot)
    12. 07:36 PM - Re: engine quit due to ethanol (ctmcdowell@comcast.net)
    13. 07:48 PM - Re: engine quit due to ethanol (Roger Lee)
    14. 08:15 PM - Re: Rotax 912 Series Engine Cruise RPM's (Roger Lee)
 
 
 


Message 1


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    Time: 07:08:01 AM PST US
    Subject: Re: Follow me on Spot tomorrow to Yuma, AZ
    From: "Roger Lee" <ssadiver1@yahoo.com>
    Hi Noel, For some reason the link didn't copy completely. It is fixed now. It won't show anything until I turn my Spot on when I'm getting ready to leave. My last trip to Page, AZ isn't on there because I have my Spot to set wipe my track every seven days right now. When you get a Spot you can set up your preferences anyway you want and make your personal messages anything you want, plus send them to any one. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center 520-574-1080 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=317080#317080


    Message 2


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    Time: 09:53:38 AM PST US
    Subject: Re: engine quit due to ethanol
    From: bjones@dmv.com
    I have had two engines die because of phase seperation or settle-out of water and ethanol from auto gas. It got my attention. Here are a couple of take away points. When a certain amount of water is absorbed by the ethanol in auto gas, the ethanol and water settle-out to the bottom of the tank without much warning. If you sometimes saw a bit of water when you sumped your tanks in the days before the conversion to ethanol blended gas but have not seen it since, be careful. The ethanol in the auto gas may be absorbing that water now causing a false sense of security. At some point in time enough water might be absorbed to trigger settle-out. My settleout came right out of the pump because water got into the gas station tanks causing settleout to occur inside thier tanks. I had a long open and frank discussion with the folks who manage the distributers systems for most of the gas stations in my area of the state and picked thier brains. The gas distributer had major expenses at gas stations all across the region where cars stalled at the pumps or not far from the station needing tows and "repairs". I removed the settleout from my tanks and found that it passes right thru a funnel designed to capture water. So you can not rely on those funnels to catch settle-out. If you use auto gas that is not brownish in color but relatively clear looking, when you sump your tanks it will not be easy to distinguish gas from settleout. Both will look clear. If you use brownish gas and the sump fluid looks clear, suspect settle-out. When settle-out occurs you get a large volume of it fairly suddenly. About ten percent of the total quantity in the tank is settleout, so when you sump a tank you will not see the familiar "line" between water and gas that we are accustomed to with av-gas or ethanol free gas if a small amount of water is present. If your tank has 10 gallons of fuel, one gallon will be settleout, way more than most pilots routinely sump out of thier tanks. If you have a header tank it may be possible to get into the air before settle-out from a wing tank gets to the engine and kills it. As others have said, ethanol absorbs water from the atmosphere and from condensation inside your gas tanks, so leaving gas sitting for extended time frames in a plane or gas can may trigger settleout in areas of high humidity. Gas distributers do add the ethanol to tankers just as they leave on delivery in order to avoid absorption of water from the atmosphere. Planes and fuel containers that are vented and exposed to rain, wind driven rain or other water sources are at increased risk. Arid areas pose low risk. The test paste that is used on the end of rods to detect water in gas tanks requires a trained eye to detect settle-out. The gas distributers tech showed me and I could not detect settle-out although he thought he could. Most car gas systems are refilled with fresh fuel frequently, and are sealed so absorption of atmospheric moisture is minimal posing very low risk of settleout. Settleout is not a common problem, but when it occurs it can be dangerous.


    Message 3


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    Time: 10:23:51 AM PST US
    From: Pete Christensen <pchristensen10@austin.rr.com>
    Subject: Re: engine quit due to ethanol
    Thanks BJ, That is one reason I wash my gasoline. I hangared in Las Cruces, NM (where I could get ethanol free gas) before I moved to the Austin, TX area (where they introduced ethanol starting last fall). Before I moved, I never found any water when I sumped my tanks. Now I get water every time I sump. I moved from a dry environment to a wet one AND lost the availability of ethanol free gas. Pete Leander, TX Kitfox III, 912 On 10/26/2010 11:50 AM, bjones@dmv.com wrote: > --> Kitfox-List message posted by: bjones@dmv.com > > I have had two engines die because of phase seperation or settle-out of > water and ethanol from auto gas. It got my attention. Here are a couple of > take away points. > > When a certain amount of water is absorbed by the ethanol in auto gas, the > ethanol and water settle-out to the bottom of the tank without much > warning. > > If you sometimes saw a bit of water when you sumped your tanks in the days > before the conversion to ethanol blended gas but have not seen it since, > be careful. The ethanol in the auto gas may be absorbing that water now > causing a false sense of security. At some point in time enough water > might be absorbed to trigger settle-out. > > My settleout came right out of the pump because water got into the gas > station tanks causing settleout to occur inside thier tanks. I had a long > open and frank discussion with the folks who manage the distributers > systems for most of the gas stations in my area of the state and picked > thier brains. > > The gas distributer had major expenses at gas stations all across the > region where cars stalled at the pumps or not far from the station needing > tows and "repairs". > > I removed the settleout from my tanks and found that it passes right thru > a funnel designed to capture water. So you can not rely on those funnels > to catch settle-out. > > If you use auto gas that is not brownish in color but relatively clear > looking, when you sump your tanks it will not be easy to distinguish gas > from settleout. Both will look clear. If you use brownish gas and the sump > fluid looks clear, suspect settle-out. > > When settle-out occurs you get a large volume of it fairly suddenly. About > ten percent of the total quantity in the tank is settleout, so when you > sump a tank you will not see the familiar "line" between water and gas > that we are accustomed to with av-gas or ethanol free gas if a small > amount of water is present. If your tank has 10 gallons of fuel, one > gallon will be settleout, way more than most pilots routinely sump out of > thier tanks. > > If you have a header tank it may be possible to get into the air before > settle-out from a wing tank gets to the engine and kills it. > > As others have said, ethanol absorbs water from the atmosphere and from > condensation inside your gas tanks, so leaving gas sitting for extended > time frames in a plane or gas can may trigger settleout in areas of high > humidity. > > Gas distributers do add the ethanol to tankers just as they leave on > delivery in order to avoid absorption of water from the atmosphere. > > Planes and fuel containers that are vented and exposed to rain, wind > driven rain or other water sources are at increased risk. > > Arid areas pose low risk. > > The test paste that is used on the end of rods to detect water in gas > tanks requires a trained eye to detect settle-out. The gas distributers > tech showed me and I could not detect settle-out although he thought he > could. > > Most car gas systems are refilled with fresh fuel frequently, and are > sealed so absorption of atmospheric moisture is minimal posing very low > risk of settleout. > > Settleout is not a common problem, but when it occurs it can be dangerous. > >


    Message 4


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    Time: 11:27:27 AM PST US
    From: Pete Christensen <pchristensen10@austin.rr.com>
    Subject: Re: Follow me on Spot tomorrow to Yuma, AZ
    This must be it. http://share.findmespot.com/shared/faces/viewspots.jsp?glId=0AvaI1rlZrsiSHpAmA4WO25eB0VkBu5Iv On 10/26/2010 9:05 AM, Roger Lee wrote: > --> Kitfox-List message posted by: "Roger Lee"<ssadiver1@yahoo.com> > > Hi Noel, > > For some reason the link didn't copy completely. It is fixed now. It won't show anything until I turn my Spot on when I'm getting ready to leave. My last trip to Page, AZ isn't on there because I have my Spot to set wipe my track every seven days right now. When you get a Spot you can set up your preferences anyway you want and make your personal messages anything you want, plus send them to any one. > > -------- > Roger Lee > Tucson, Az. > Light Sport Repairman - Maintenance Rated > Rotax Repair Center > 520-574-1080 > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=317080#317080 > >


    Message 5


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    Time: 01:05:35 PM PST US
    Subject: Re: EGT's & Oil Temp
    From: "JetPilot" <orcabonita@hotmail.com>
    lcfitt(at)sbcglobal.net wrote: > Regarding the cruise RPM, the max cruise is 5500 and most of the guys I flew > with ran that or close to that as we allways flew at the speed of the > slowest airplane. I also know folks that use that as a max RPM - Just flew > in a SeaRay that the guy maxes at 5300. I have heard Eric Tucker say 5500 > is fine for contiuous cruise. I also understand that the biggest factor > with RPM and the 912, is running it too slow in cruise as torsional > vibration at the lower RPMs are not good for the gearbox. Keep it over 5000 > to 5100 minimum in cruise. > > Lowell Fitt > Cameron Park, CA > Model IV-1200 R-912 UL > Currently focusing on the Left Wing Rudder Gapseal Cuffs and Landing Gear > Fairing > > --- The above is simply false information. There is NO information by Rotax that says you can not cruise your 912 series engine at less than 5000 RPM. Think about it, an engine you were required to run at 5000 RPM or more ( about 75 % power or more ) all the time would be pretty useless in many sport airplanes. Since this issue has come up a lot, and Lowell constantly gives people bad advice on this, I took the time to look this up in the Rotax manual and service bulletins. What Rotax says is to avoid high RPM settings with high throttle settings which would lug the engine.. ( This is good advice with any aviation engine. ) So you can take Lowell's " I heard an an airshow " advice or you can operte your engine according to what Rotax tells publishes. Below is what Rotax says: After a pretty good search, I found ZERO publications limiting cruise of 912 engines below 5000 RPM. Second, there are many mentions operating RPM's, INCLUDING crusing below 5000 RPM. Here it is straight from the Rotax operators manual: http://www.rotax-aircraft-engines.co...kus/d04670.pdf Page 5-3 Revision April 01 2010 " RUN THE ENGINE ACCORDANCE WITH THE FOLLOWING TABLE " They list RPM's of 5800 RPM 5500 RPM 5000 RPM 4800 RPM 4300 RPM The graphs on the previous pages cover the full RPM range from 2500 to 5800 RPM. There is a service letter Rotax SL-912-016 that warns against " HIGH ENGINE LOAD WITH LOW RPM " and a couple other things. http://www.rotax-aircraft-engines.co...kus/d04670.pdf http://www.rotax-aircraft-engines.co...kus/d04645.pdf Mike -------- &quot;NO FEAR&quot; - If you have no fear you did not go as fast as you could have !!! Kolb MK-III Xtra, 912-S Read this topic online here: http://forums.matronics.com/viewtopic.php?p=317123#317123


    Message 6


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    Time: 01:07:02 PM PST US
    Subject: Rotax 912 Series Engine Cruise RPM's
    From: "JetPilot" <orcabonita@hotmail.com>
    lcfitt(at)sbcglobal.net wrote: > Regarding the cruise RPM, the max cruise is 5500 and most of the guys I flew > with ran that or close to that as we allways flew at the speed of the > slowest airplane. I also know folks that use that as a max RPM - Just flew > in a SeaRay that the guy maxes at 5300. I have heard Eric Tucker say 5500 > is fine for contiuous cruise. I also understand that the biggest factor > with RPM and the 912, is running it too slow in cruise as torsional > vibration at the lower RPMs are not good for the gearbox. Keep it over 5000 > to 5100 minimum in cruise. > > Lowell Fitt > Cameron Park, CA > Model IV-1200 R-912 UL > Currently focusing on the Left Wing Rudder Gapseal Cuffs and Landing Gear > Fairing > > --- The above is simply false information. There is NO information by Rotax that says you can not cruise your 912 series engine at less than 5000 RPM. Think about it, an engine you were required to run at 5000 RPM or more ( about 75 % power or more ) all the time would be pretty useless in many sport airplanes. Since this issue has come up a lot, and Lowell constantly gives people bad advice on this, I took the time to look this up in the Rotax manual and service bulletins. What Rotax says is to avoid high RPM settings with high throttle settings which would lug the engine.. ( This is good advice with any aviation engine. ) So you can take Lowell's " I heard an an airshow " advice or you can operte your engine according to what Rotax tells publishes. Below is what Rotax says: After a pretty good search, I found ZERO publications limiting cruise of 912 engines below 5000 RPM. Second, there are many mentions operating RPM's, INCLUDING crusing below 5000 RPM. Here it is straight from the Rotax operators manual: http://www.rotax-aircraft-engines.co...kus/d04670.pdf Page 5-3 Revision April 01 2010 " RUN THE ENGINE ACCORDANCE WITH THE FOLLOWING TABLE " They list RPM's of 5800 RPM 5500 RPM 5000 RPM 4800 RPM 4300 RPM The graphs on the previous pages cover the full RPM range from 2500 to 5800 RPM. There is a service letter Rotax SL-912-016 that warns against " HIGH ENGINE LOAD WITH LOW RPM " and a couple other things. http://www.rotax-aircraft-engines.co...kus/d04670.pdf http://www.rotax-aircraft-engines.co...kus/d04645.pdf Mike -------- &quot;NO FEAR&quot; - If you have no fear you did not go as fast as you could have !!! Kolb MK-III Xtra, 912-S Read this topic online here: http://forums.matronics.com/viewtopic.php?p=317124#317124


    Message 7


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    Time: 01:33:03 PM PST US
    Subject: Re: engine quit due to ethanol
    From: "Roger Lee" <ssadiver1@yahoo.com>
    If you ever see water in the gascolator or sump using fuel with ethanol then the entire system including the fuel tanks must be drained. That means the entire fuel is fully saturated with water and there is so much of it, it is falling out of solution. This is not the same with Avgas as that fuel will not absorb the water and it settles to the low points right away. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center 520-574-1080 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=317130#317130


    Message 8


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    Time: 01:43:46 PM PST US
    Subject: Re: EGT's & Oil Temp
    From: "Roger Lee" <ssadiver1@yahoo.com>
    Depending on where you live and the altitude you fly EGT's will run 1350F to 1470F under normal conditions. There are several factors that effect this and not purely the fuel. In the warmer months 1420F-1470F is very normal. I would question EGT's over 1500F because even though it can fly there that usually isn't normal. The EGT's can be cooler than 1350F if you fly really high or it is really cold out. Normal oil can be anywhere from 175F-230F for normal temps, again it all depends on altitude and OAT. I also tape my radiator during the winter and try to keep oil temps to at least 200F+. If you live where it is really cold this can be a challenge. If you live where it is cold you may want to look into a Tanis engine preheat system. they are designed with the Rotax in mind and work extremely well. With OAT around zero the Tanis can have you entire engine block and oil up to 65F-70F. I have installed several of these and highly recommend them. You can see a video on the ROAN website. Quite impressive. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center 520-574-1080 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=317132#317132


    Message 9


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    Time: 02:00:25 PM PST US
    Subject: Re: Rotax 912 Series Engine Cruise RPM's
    From: "Roger Lee" <ssadiver1@yahoo.com>
    Hi Mike, Your right that it is not written in the manual. The only place to get this info is to look at the published engine torque curve (5000 rpm max torque), take Eric's class where he will tell you or talk to one of the people from the factory where they will tell you that the engine was engineered to run between 4800-5200 rpm for cruise. Yes it will run lower, but it isn't good for it. Eric will tell you 5000-5300 is a really good place to be. Your 912 (UL or ULS) can do a lot of things and will run there, but what is healthy for the continued longevity of the engine is a different story. Just like cholesterol and smoking. Won't kill you today, but the accumulative affects over time are destructive. We work on "Best Practices" from accumulated history since 1989 for the 912. Keep the best and toss out what causes premature rebuild or extra maint. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center 520-574-1080 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=317133#317133


    Message 10


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    Time: 03:06:48 PM PST US
    From: Pete Christensen <pchristensen10@austin.rr.com>
    Subject: Re: engine quit due to ethanol
    Thanks Roger. That is one great reason I first wash my gas. Pete On 10/26/2010 3:30 PM, Roger Lee wrote: > --> Kitfox-List message posted by: "Roger Lee"<ssadiver1@yahoo.com> > > If you ever see water in the gascolator or sump using fuel with ethanol then the entire system including the fuel tanks must be drained. That means the entire fuel is fully saturated with water and there is so much of it, it is falling out of solution. This is not the same with Avgas as that fuel will not absorb the water and it settles to the low points right away. > > -------- > Roger Lee > Tucson, Az. > Light Sport Repairman - Maintenance Rated > Rotax Repair Center > 520-574-1080 > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=317130#317130 > >


    Message 11


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    Time: 05:14:55 PM PST US
    Subject: Re: Rotax 912 Series Engine Cruise RPM's
    From: "JetPilot" <orcabonita@hotmail.com>
    Hi Roger, You are one of the most knowledgeable people on the Rotax 912 that I have ever seen post on any forum. You are the first guy I would go to if I ever had a 912 question ! ( I am still using the oil filters based on your research. ) Many planes, such as mine, and the twin engine AirCam are happy with cruise RPM's in the mid 4,000 RPM range. My plane feels best at 4200 RPM and that is where I have always cruised at. Since Rotax publishes power curves and specs for low RPM's, why is this bad ? My theory is that somewhere along the line some Rotax guy wanted to prevent people from propping their Rotax 912' in the 4,000's and running a very high throttle setting therefore " Lugging the engine " The Rotax service bulletin even talks about this. Rotx has given us a huge amount of information from on RPM's in their manuals and service bullitens, Maximum RPM limitations, Minimum idle RPM, Power VS RPM in cuise, etc. Things like minimum idle will not destroy the engine fast, it happens over time, but Rotax still takes the trouble to tell us. I think that if cruising below 5000 RPM's was in any way bad, Rotax would have told us. I believe that someone close to Rotax early on misunderstood the over propped condition with high power and the " Cruise Above 5000 RPM " myth started. I was hoping you would comment on this, so if I a missing something, by all means let me know ! Mike -------- &quot;NO FEAR&quot; - If you have no fear you did not go as fast as you could have !!! Kolb MK-III Xtra, 912-S Read this topic online here: http://forums.matronics.com/viewtopic.php?p=317149#317149


    Message 12


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    Time: 07:36:29 PM PST US
    From: ctmcdowell@comcast.net
    Subject: Re: engine quit due to ethanol
    =C2-=C2- I have the drain on the bottom of my tank but I never use it. =C2- I made a=C2-clear tubing siphon with a primer bulb near one end. I slide a piece or white pvc over the tubing to keep it strai ght. I then put the pvc & tube into the tank to the bottom and siphon the b ottom of the tank like a swimming pool bottom sweeper. This picks up not on ly any water but it will pick up any sediment in the tank. Never had a prob lem with water due to the ethanol using this method . I sweep the tank once a month.=C2- I also have stripped out ethanol but never put the straight gas in my plane.=C2- Works fine in all my other I/C engines. Hope this h elps someone.-Lion8 ----- Original Message ----- From: bjones @ dmv .com Sent: Tuesday, October 26, 2010 12:50:46 PM Subject: Re: Kitfox-List: engine quit due to ethanol I have had two engines die because of phase seperation or settle-out of water and ethanol from auto gas. It got my attention. Here are a couple of take away points. When a certain amount of water is absorbed by the ethanol in auto gas, the ethanol and water settle-out to the bottom of the tank without much warning. If you sometimes saw a bit of water when you sumped your tanks in the days before the conversion to ethanol blended gas but have not seen it since, be careful. The ethanol in the auto gas may be absorbing that water now causing a false sense of security. At some point in time enough water might be absorbed to trigger settle-out. My settleout came right out of the pump because water got into the gas station tanks causing settleout to occur inside thier tanks. I had a long open and frank discussion with the folks who manage the distributers systems for most of the gas stations in my area of the state and picked thier brains. The gas distributer had major expenses at gas stations all across the region where cars stalled at the pumps or not far from the station needing tows and "repairs". I removed the settleout from my tanks and found that it passes right thru a funnel designed to capture water. So you can not rely on those funnels to catch settle-out. If you use auto gas that is not brownish in color but relatively clear looking, when you sump your tanks it will not be easy to distinguish gas from settleout . Both will look clear. If you use brownish gas and the sump fluid looks clear, suspect settle-out. When settle-out occurs you get a large volume of it fairly suddenly. About ten percent of the total quantity in the tank is settleout , so when you sump a tank you will not see the familiar "line" between water and gas that we are accustomed to with av-gas or ethanol free gas if a small amount of water is present. If your tank has 10 gallons of fuel, one gallon will be settleout , way more than most pilots routinely sump out of thier tanks. If you have a header tank it may be possible to get into the air before settle-out from a wing tank gets to the engine and kills it. As others have said, ethanol absorbs water from the atmosphere and from condensation inside your gas tanks, so leaving gas sitting for extended time frames in a plane or gas can may trigger settleout in areas of high humidity. Gas distributers do add the ethanol to tankers just as they leave on delivery in order to avoid absorption of water from the atmosphere. Planes and fuel containers that are vented and exposed to rain, wind driven rain or other water sources are at increased risk. Arid areas pose low risk. The test paste that is used on the end of rods to detect water in gas tanks requires a trained eye to detect settle-out. =C2-The gas distribute rs tech showed me and I could not detect settle-out although he thought he could. Most car gas systems are refilled with fresh fuel frequently, and are sealed so absorption of atmospheric moisture is minimal posing very low risk of settleout . Settleout is not a common problem, but when it occurs it can be dangerous. =========== =========== MS - =========== e - =C2- =C2- =C2- =C2- =C2--Matt Dralle , List Admin. ===========


    Message 13


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    Time: 07:48:46 PM PST US
    Subject: Re: engine quit due to ethanol
    From: "Roger Lee" <ssadiver1@yahoo.com>
    Pete, I see you are running a 912. Is it the UL 80 hp or the ULS 100 hp? The washed gas with the 80 hp is ok if you washed 91 oct.at the left over 88 octane, but if you have the ULS 100 hp. You need to add some Avgas to get the octane back up to 91. If you are washing 87 oct. then it isn't sutible for the UL either and would need some Avgas to bring it's octane rating back up. Rotax says no less than a 50/50 mix when trying to raise octane with Avgas from a low auto fuel octane. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center Home 520-574-1080 TRY HOME FIRST Cell 520349-7056 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=317163#317163


    Message 14


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    Time: 08:15:46 PM PST US
    Subject: Re: Rotax 912 Series Engine Cruise RPM's
    From: "Roger Lee" <ssadiver1@yahoo.com>
    Howdy Mike, It is two things and there are of course a few variables that we could talk ourselves to death over. The main two issues without throwing in all the variables is vibration and metal stress or lugging if you like that term. Now of course prop pitch plays a part here. Low 4000's aren't good to stay at for long periods. We all operate in high and low rpms we just usually never stay there. The engine torque is set up to come on strong at 4800, 5000 max torque and at 5200 the torque is where it was at 4800. This 400 rpm range is it's sweet spot so to speak. As the rpm climbs past 5000 the engine torque starts to drop off and continues to drop, but as the rpm climbs the HP goes up until it hits it's theoretical design peak at 5800 rpm. The publishing of the data you speak of is just part of the technical data that was tested and produced by Rotax. Some times I think we all are subject to too much info and we don't always know what to do with it, me included because I'm the analytical type anyway. I have been to a number of Rotax classes over the years and in all of them this question comes up. In every class the answer over the years has been the same. Cruise somewhere between 4800-5300 rpm. This rpm will depend of course on how you have your prop set and to some degree on your plane. You should run the higher rpms if using Avgas to help keep the lead blown out. Our little engines will fly what ever rpm we choose and even if you do other not so good things to them, but what I think many of us want is a reliable engine, one that we don't have to maint. often, shell out any more money than we have to and keep it in good health so it will be that way to TBO. Doing non recommended things to it like eating high cholesterol foods or smoking will only cause its earlier than normal demise, which means a bunch of money out of your pocket. Doing the right thing by our Rotax engine is like keeping it on a healthy diet and exercise routine for life. I'm not doing such a good job on that part with my body, but my Rotax will out live me. [Laughing] I'm never here to dictate how someone should run their engine because it is their engine, but only offer good choices to keep it the way I know people want it, in good solid shape for many years. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center Home 520-574-1080 TRY HOME FIRST Cell 520349-7056 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=317166#317166




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