---------------------------------------------------------- Kolb-List Digest Archive --- Total Messages Posted Wed 04/10/19: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:00 AM - Re: 277 keeps falling off the pipe (slingshot003) 2. 07:10 AM - Kolb Plans Correction (slingshot003) 3. 02:38 PM - Re: 277 keeps falling off the pipe (Richard Pike) ________________________________ Message 1 _____________________________________ Time: 07:00:50 AM PST US Subject: Kolb-List: Re: 277 keeps falling off the pipe From: "slingshot003" Richard, Is the exhaust a stock 277 exhaust pipe? If not, an improper taper in the tuned section could be the cause. Also, adjusting the midrange/full power jetting in your carb might help. I would theorize that an overly rich mixture in the problematic throttle range could produce those symptoms, but you say the egt numbers are good so that doesn't seem likely. -Richard Swiderski Read this topic online here: http://forums.matronics.com/viewtopic.php?p=488658#488658 ________________________________ Message 2 _____________________________________ Time: 07:10:13 AM PST US Subject: Kolb-List: Kolb Plans Correction From: "slingshot003" Kolbers, A few weeks back, I said I spoke with Kolb about the getting the plans and builders manual and was told they do not have any for the FS KXP. Well I spent some time talking with Bryan Melborn at Sun & Fun, and he said they have plans and manuals for all the models. -Richard Swiderski Read this topic online here: http://forums.matronics.com/viewtopic.php?p=488659#488659 ________________________________ Message 3 _____________________________________ Time: 02:38:24 PM PST US Subject: Kolb-List: Re: 277 keeps falling off the pipe From: "Richard Pike" slingshot003 wrote: > Richard, > > Is the exhaust a stock 277 exhaust pipe? If not, an improper taper in the tuned section could be the cause. -Richard Swiderski Well, yes and no, I am starting to think no. The original pipe was a curlyque like the one in the bottom left of the attachment, but we wanted to try something to reduce the engine vibration, and I found a supplier of tapered cones for people who are fabricating their own exhausts and headers. Short version; got a cone that was exactly the right taper and diameter at both the top and bottom when cut to the length as referenced according to the top center pipe in the catalog. At 16 3/4" long, the top diameter where it welds to the can is the same as the diameter of the opening in the can. The diameter at the bottom (small end) is the same as the diameter of the 879-190 female joint connection. Consequently I would have bet money that the straight section would be identical to a stock Rotax pipe with that configuration, but I am starting to think it is not. Flew it twice last night, took a bit of pitch out of the prop each time, trying to compensate for it maybe being overpropped; this chart shows the correct prop diameter and pitch for a 277: http://www.ultralightnews.ca/articles/rotaxproprecommendation.htm Since we are running a 62" two blade IVO, it seemed possible we are overpropped, However I flew it twice more today each time taking out pitch, to the point that you can't even give it full throttle or it will overspeed, and that was not helpful, so I think I will assume it is not overpropped. I think I weld the original curleyque pipe back on and see if it runs properly. If that issue gets fixed, then I'll worry about the vibration. Or sell it and get a different engine. -------- Richard Pike Kolb MKIII N420P (420ldPoops) Kolb Firefly Part 103 legal Kingsport, TN 3TN0 Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=488665#488665 Attachments: http://forums.matronics.com//files/img450_medium_173.jpg ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kolb-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Kolb-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/kolb-list Browse Digests http://www.matronics.com/digest/kolb-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.