---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Mon 08/26/13: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:39 AM - Running 582 Engines LOP (BobP) 2. 07:52 AM - Re: Running 582 Engines LOP (Guy Buchanan) ________________________________ Message 1 _____________________________________ Time: 04:39:04 AM PST US Subject: RotaxEngines-List: Running 582 Engines LOP From: "BobP" I have a Rotax 582 with a warp comp prop in a Pulsar. The engine has the oil injection system fitted. Because of the slippery Pulsar profile (5000rpm and 90 knots at 12 litres/hour) EGTs tend to nudge the maximum limit when in fast cruise descent - because of the low load on the fast revving engine. I prefer the keep the engine away from red line limits, and can reduce EGTs by either throttling back even further so the engine is developing minimal power, or by slowing the plane down and applying flaps to make the plane more draggy. Neither of these options is ideal, and I wondered if it is possible to safely reduce EGTs (at cruise power) by running the 582 engine lean of peak (LOP) eg by using a hacman type device to weaken the mixture. The normal cruise mix seems fine (plugs noses mid to deep brown) so I don't want to raise the carb needle and richen this setting. Any thoughts/experience on running a 582 injected engine LOP appreciated - good and bad. Thanks Bob P -------- BobP Read this topic online here: http://forums.matronics.com/viewtopic.php?p=407485#407485 ________________________________ Message 2 _____________________________________ Time: 07:52:41 AM PST US From: Guy Buchanan Subject: Re: RotaxEngines-List: Running 582 Engines LOP On 8/26/2013 4:37 AM, BobP wrote: > Neither of these options is ideal, and I wondered if it is possible to safely reduce EGTs (at cruise power) by running the 582 engine lean of peak (LOP) eg by using a hacman type device to weaken the mixture. The normal cruise mix seems fine (plugs noses mid to deep brown) so I don't want to raise the carb needle and richen this setting. > Well. As far as I know there's no such thing as LOP for a 582. Or if there is, the peak is well beyond what the engine will handle. So you always live rich of peak, but constantly bump up against it, since the EGT limit gives you best power and fuel economy. (That said, I have run too lean by long descent with a lean mixture through "peak" until the engine quit. The engine was at idle, however, so I never noticed an EGT "peak".) Your idea of using a Hacman for EGT control is a good one, though. I used one all the time I had my 582 (4 years, 500 hours) and loved it. I only had to change mains a couple of times, in Utah and Idaho, when I was spending a lot of time at altitude and wanted to "re-center" my mixture control. (My home port was at 1500'.) The Hacman gave me about 80F EGT range, which seems small, but is quite useful. What Hacman will /not /do is give you enough control to go downhill any way you want. If your mains are set correctly you'll /always /be able to redline the EGT going down hill. You just have to get used to either very long or very short or stepped descents. (There was another system on the market which screwed the mid-range needles in and out that might have given more control. Don't know what happened to it.) I highly recommend the Hacman. (Easy to install, too.) Guy Buchanan Ramona, CA Kitfox IV-1200 / 912-S / Warp 3cs / 500 hrs. and grounded Now a glider pilot, too. ------------------------------------------------------------------------------------- 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.