---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Fri 08/20/10: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:56 AM - Re: Re: 447 analysis (rparigor@suffolk.lib.ny.us) 2. 06:40 AM - Re: 447 analysis (lucien) ________________________________ Message 1 _____________________________________ Time: 02:56:45 AM PST US Subject: Re: RotaxEngines-List: Re: 447 analysis From: rparigor@suffolk.lib.ny.us Hi Rick "Do you still fly the balloon? That articleyou sent me was a hit with my EAA chapter." I haven't in several years. building a Europa XS, but will drag it out when I am flying the XS. BTW I needed to cut and paste back together the expansion chamber to get it to fit the "Screwball" frame which changed things a little and also installed a sock air filter that changed things a lot. That engine is 73cc and puts out 22HP. After some fiddeling the thing runs great! Ron Parigoris ________________________________ Message 2 _____________________________________ Time: 06:40:20 AM PST US Subject: RotaxEngines-List: Re: 447 analysis From: "lucien" undoctor wrote: > Thanks to both of you for your contributions, Lucien and Rick. I've > messed with the load factor and there are times I can get it to pull > steady at 48 - 5000, but I seem to be descending (just ordered a digital > Attitude Indicator which will make it easier than using the VSI) It's > encouraging to know that this part of my question seems to be the > "nature of the beast." The 50% tan 50% black spark plug has me a bit > more concerned, though. > > You probably won't ever be able to get the mixture exactly the same on both cyls when running the single carb. Like I said, the 503 has the same problem when run single-carb, tho to a lesser degree. So it's not really just a problem with the 447. So the best you can do is identify the lean cylinder and ensure that that one always runs sufficiently rich. Generally, tho, when jetted according to Rotax specs, you're practically always where you need to be with that. So if you find that you have to jet a long ways from the recommended settings for your altitude and temp, then you know you have a problem. Rick is right tho that the load on the motor is the main treatment. Particularly if you're underpropped the engine will really wander around in that midrange throttle setting, is what I found. Finally, and not meaning to be contrary, 6000 rpm all the time is really too much. The 2-strokes, especially the 582, aren't like the 912 series which can be run at max power pretty much all the time. They're 2-stroke engines and they work harder than the 4-stroke 912's do. The 447 is generally more forgiving of this than the other two, but for the longest life I'd personally limit the max rpm on a continuous basis to about 5600; 5400 is the "sweet spot" for the 447/503. 6000+ all the time will knock a bit off your TBO as well as use a lot more gas than you really need to burn. LS -------- LS Titan II SS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=309514#309514 ------------------------------------------------------------------------------------- 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.