---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Thu 07/04/13: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:41 AM - Re: Re: RotaxEngines 912uls power loss on takeoff (FLYaDIVE) 2. 06:03 AM - Re: Re: RotaxEngines 912uls power loss on takeoff (John Cox) 3. 08:40 AM - Re: Engine run on when trying to stop. (Catz631@aol.com) ________________________________ Message 1 _____________________________________ Time: 05:41:43 AM PST US Subject: Re: RotaxEngines-List: Re: RotaxEngines 912uls power loss on takeoff From: FLYaDIVE Paul: Question: Where is the sensor located in relation to the closest fitting in the direction of fuel flow? Why do I ask? Fluid Dynamics 101 - The tap in the feed line must be 7 x the ID BACK from the nearest fitting. I'm not going to get into the complete answer but the simple answer is wave progression with peaks and troughs. If you are too close or at a trough there will be fluctuations and low pressure readings. *Barry* *"Do you know why pilots think they are mechanics? Because they can buy tools at Home Depot.'* ________________________________ Message 2 _____________________________________ Time: 06:03:46 AM PST US Subject: Re: RotaxEngines-List: Re: RotaxEngines 912uls power loss on takeoff From: John Cox LOVE that quote! Don't forget to research Matt Dralle's fuel accumulator as a potential fix along with the 7x I.d. factoid. John On Jul 4, 2013 5:44 AM, "FLYaDIVE" wrote: > Paul: > > Question: Where is the sensor located in relation to the closest fitting > in the direction of fuel flow? > > Why do I ask? Fluid Dynamics 101 - The tap in the feed line must be 7 x > the ID BACK from the nearest fitting. > I'm not going to get into the complete answer but the simple answer is > wave progression with peaks and troughs. If you are too close or at a > trough there will be fluctuations and low pressure readings. > > *Barry* > > *"Do you know why pilots think they are mechanics? Because they can buy > tools at Home Depot.'* > > * > > * > > ________________________________ Message 3 _____________________________________ Time: 08:40:32 AM PST US From: Catz631@aol.com Subject: Re: RotaxEngines-List: Engine run on when trying to stop. Dennis, I have had this problem for about a year (or more) now. I have done the carbs,gearbox shimming,fuel additives,new plugs,bore scoping cylinders for carbon deposits,high octane boosters/gas,shut down at higher rpms,gone to a lighter prop( which helped a little),etc..you name it I have done it ALL to no avail.( I thought I was the only one in the country with this problem) Now when my engine diesels ,it turns backwards about 3-6 revolutions.( my theory is that the prop stops at the peak of the"dogs" in the gearbox and it flips the prop backwards) As a result ,I have to do the valve check to make sure I don't have any air ingestion in the lifters (I have done it at least a dozen times and can do this check in my sleep now) I have never found any air, at least according to the tappet clearance check Rotax specifies. I thought about using Velcro to attach my cowl as it would come off easier during these checks ! (lol) However, I have not had this problem in the last few months because I have used a different shutdown method and it appears to be working well. I now pull the throttle back to about 1500 rpm,shut off one mag then pull further back to about 1000-1100 rpm then shut off the other mag. This seems to have solved my problem, even with a warm engine (mine never really gets hot in my radial nosed Kitfox) Prior to this method I would shut down at around 1800 rpm and then I might get the diseling on occasion. I know the gearbox doesn't like low rpm's but you are only there for a very short time before the engine quits. Give this a shot and see if it works for you. Please let us know. Dick Maddux 912 UL (400 hrs tt) ------------------------------------------------------------------------------------- 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.