When I started my conversion training on the KR2 I had just bought, on the second flight, the engine missed a beat. At that time, I had partially redundant ignition (two electronic timing systems, but only one set of coils and plugs). The second system was supposed to be used for backup only. That showed me what a real pilot is made of. The instructor had owned a KR2 before, but he was hardly familiar with that specific KR2. Yet, he reached for the ignition switches at lightspeed, and before I knew it, we were on backup mode.
Back at the hangar, I investigated the problem. To my absolute shame, I realized it was all my fault. One of the spark plug caps was loose. A light turbulence had it jump up for a couple seconds. Never happened again. Serge Vidal KR2 "Kilimanjaro Cloud" Paris, France "Orma" <[email protected]> Envoyé par : [email protected] 2005-07-06 10:04 Veuillez répondre à KRnet Remis le : 2005-07-06 10:04 Pour : "KRnet" <[email protected]> cc : (ccc : Serge VIDAL/DNSA/SAGEM) Objet : Re: KR> Carb options? Hello Net An occasional miss can be real confusing, especially when you are using a single ignition system. If you are really concerned you could eliminate ignition as the cause by installing a dual ignition system. What is the chance that both systems could have a miss at the same time. My old 1915 had an occasional miss. On my new 2366 I installed dual ignition and have only had one miss, and I feel it was mixture related due to turning off my boost pump at full power. I have come to the conclusion that their might be other problems that could cause the random miss. One possibility is a sticking valve. This could happen when the engine is really heat soaked from extended taxi time and a lot of pattern work where the engine is not allowed to cool between full power operations. Another possibility is for momentary fuel vapor lock. Again a heat soaked engine compartment on a hot day could be enough to boil the fuel. I have practiced limiting full power operations on warm days. I do pattern work early in the morning when the temp is cool. On hot days I only use enough power to get off the ground and power back as soon as I can to allow the engine to stay cool. Catching or finding the cause of a random miss is not easy. Orma Southfield, MI N110LR Tweety, old enough to drink this year Flying and more flying, to the gathering or bust http://www.kr-2.aviation-mechanics.com/ _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to [email protected] please see other KRnet info at http://www.krnet.org/info.html
