Thought about it... two things come to mind. 1) Manifold vacuum leak causing an imbalance in the fuel mixture side to side. Interesting to note that the plugs with the 'RICH' symptoms had the "BEST" compression readings. 2) I don't know what your ignition set up is, but that would be the next thing I would look to. Finally, a blocked air passage, mis-functioning choke/enricher, primer valve not closing properly.
If I recall, didn't you say that this bird was down for some significant maintenance issues? What did you change or "mess" with? As in anything, ask what is different now compared to the last time it ran well? Sorry to belabor the obvious! -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of Mark Jones Sent: Sunday, April 22, 2007 7:01 AM To: KRnet Subject: KR> Fw: Aborted takeoff. I sent the post below to Corvair Net last night. Thought you Kr'ers may have some advice too. Mark Jones (N886MJ) Wales, WI Visit my web site: www.flykr2s.com E-mail: flyk...@wi.rr.com ----- Original Message ----- From: Mark Jones To: Corvair Net Sent: Saturday, April 21, 2007 2:02 PM Subject: Aborted takeoff. This morning I arrived the airport at the break of dawn. I was looking forward to a nice flight in the 45° smooth morning air. My run up seemed fine. All indications were everything was good to go. I taxied onto the 5,800' runway and firewalled her. As she picked up speed I noticed my rpm was not getting above 2600 and this is not normal for me. I usually see around 3000 on take off roll and will get 3250 on climb out. Something in my gut told me to abort, which I did. I called the tower and since I was the only one on the field at the time they said I could do a 180° and taxi back, which I did a high speed taxi back. I decided to take her to the hangar and do some checking. At 1000 rpm: Oil PSI 18 lbs, Oil temp 280°, EGT off low end scale, CHT 280°. At 2600 rpm: Oil PSI 28 lbs, Oil temp 230°, EGT 1225°, CHT 270°. Next I pulled the plugs: 2-4-6 were black sooty showing richness on that bank. 1-3-5 were clean slightly white showing leanness on that bank. Next I did a compression check: 1 = 80/76 3 = 80/70 5 = 80/70 2 = 80/76 4 = 80/77 6 = 80/77 Thoughts anyone? Mark Jones (N886MJ) Wales, WI Visit my web site: www.flykr2s.com E-mail: flyk...@wi.rr.com _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net Post photos, introductions, and For Sale items to http://www.kr2forum.com/phpBB2/index.php please see other KRnet info at http://www.krnet.org/info.html
