---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Thu 04/26/12: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:40 PM - Re: 912ULS starts missing at cruise power (Phil) 2. 02:44 PM - Re: 912ULS starts missing at cruise power (chris davis) ________________________________ Message 1 _____________________________________ Time: 01:40:14 PM PST US From: Phil Subject: Re: RotaxEngines-List: 912ULS starts missing at cruise power You can test for ethanol laden gas (if you should ever doubt the source you bought from) by adding 10% water to a small, tall, thin container of gas, shaking, and watching to see if the 10% mark increases. If the level of the water (at the bottom) stays the same, you have ethanol- free gas. If it increases to, say, roughly 15%, that means you have 10% alc ohol in the gas - I read that in a test like this, only half the ethanol wi ll "disolved down into the water; the other 5% will stay suspended in the g as. Phil H FF11-4-00076; still building CRE mz201 626cc maiden voyage hopefully the first week of May. --- On Wed, 4/25/12, bjones@dmv.com wrote: From: bjones@dmv.com Subject: Re: RotaxEngines-List: 912ULS starts missing at cruise power Someone with technical expertise might offer comments on the risk of phase seperation of ethanol and water from mo gas with a big decrease in temp at altitude. When I have experienced phase seperation, the full ten percent (roughly) of the fuel that is ethanol & water settled to the bottom of the tanks and the engines would not run on the settleout. So the idea of a little bit of settleout does not fit my experience. Love to hear from someone in the fuel science industry. My prevetive measure is to use ethanol free auto gas from marina's and by checking puregas.com when traveling to find gas stations with ethanol free gas. BJ Kitfox IV 912 old fiberglass tanks so can not use gasahol > > > I though I might throw this out for the group to ponder.- I was out fly ing > yesterday and I had just leveled off at 8500 feet when the engine started > to miss.- I reduced power (to 5000) and the miss went away.- Increase > power again and it was back.- I pulled the power back and went the long > safe way around the mountains instead of over as I had intended.- When I > got closer to home, I could run the engine at extended high power and no > miss.- The miss is just like when I discovered some water in the float > bowls.- My theory is that when I climbed to 8500ft, the temperature was a > full 40 degrees less than- when I took off and that caused water to > condense out of the fuel.- When I got close to home, the temperature wa s > 80 degrees and the water went back in solution and the problem went away. > I am using premium mo gas with 10 percent ethanol. > > Jason > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=371723#371723 > > le, List Admin. ________________________________ Message 2 _____________________________________ Time: 02:44:27 PM PST US From: chris davis Subject: Re: RotaxEngines-List: 912ULS starts missing at cruise power Phil Your building is going well if you are going to fly the first-week o f may! Good luck hope that 201 is a smooth strong runner=0AChris Davis=0AKX P 503 492 hrs=0AGlider Pilot=0ADisabled from crash building Firefly=0A=0A =0A________________________________=0AFrom: Phil =0ATo: rotaxengines-list@matronics.com =0ASent: Thursday, April 26, 2012 4:37 PM =0ASubject: Re: RotaxEngines-List: 912ULS starts missing at cruise power=0A =0AYou can test for ethanol laden gas (if you should ever doubt the source you bought from) by adding 10% water to a small, tall, thin container of ga s, shaking, and watching to see if the 10% mark increases.=0A=0AIf the leve l of the water (at the bottom) stays the same, you have ethanol-free gas. I f it increases to, say, roughly 15%, that means you have 10% alcohol in the gas - I read that in a test like this, only half the ethanol will "disolve d down into the water; the other 5% will stay suspended in the gas.=0A=0APh il H=0AFF11-4-00076; still building=0ACRE mz201 626cc=0Amaiden voyage hopef ully the first week of May.=0A=0A=0A=0A--- On Wed, 4/25/12, bjones@dmv.com wrote:=0A=0A=0A>From: bjones@dmv.com =0A>S ubject: Re: RotaxEngines-List: 912ULS starts missing at cruise power=0A>To: rotaxengines-list@matronics.com=0A>Date: Wednesday, April 25, 2012, 10:42 e with technical expertise might offer comments on the risk of phaseseperat ion of ethanol and water from mo gas with a big decrease in temp ataltitude .When I have experienced phase seperation, the full ten percent (roughly)of the fuel that is ethanol & water settled to the bottom of the tanks andthe engines would not run on the settleout. So the idea of a little bit ofsett leout does not fit my experience.Love to hear from someone in the fuel scie nce industry.My prevetive measure is to use ethanol free auto gas from mari na's and bychecking puregas.com when traveling to find gas stations with et hanol freegas.BJKitfox IV 912old fiberglass tanks so can not use gasahol> - .com>>> I though I might throw this out for the group to ponder.- I was o ut flying> yesterday and I had just leveled off at 8500 feet when the engin e started> to miss.- I reduced power (to 5000) and the miss went away.- Increase> power again and it was back.- I pulled the power back and went the long> safe way around the mountains instead of over as I had intended. - When I> got closer to home, I could run the engine at extended high pow er and no> miss.- The miss is just like when I discovered some water in t he float> bowls.- My theory is that when I climbed to 8500ft, the tempera ture was a> full 40 degrees less than- when I took off and that caused wa ter to> condense out of the fuel.- When I got close to home, the temperat ure was> 80 degrees and the water went back in solution and the problem wen t away.> I am using premium mo gas with 10 percent ethanol.>> Jason>>>>> Re ad this topic online here:>> http://forums.matronics.com/viewtopic.php?p= 371723#371723>>>>>>> http://www.matronics.com/Navigator?RotaxEngines-Lis- ----> http://www.matronics.c============== ====== ------------------------------------------------------------------------------------- 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.