---------------------------------------------------------- RV-List Digest Archive --- Total Messages Posted Thu 06/14/12: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:09 AM - Re: rough running during taxi after landing (Panama Red) ________________________________ Message 1 _____________________________________ Time: 08:09:51 AM PST US From: "Panama Red" Subject: Re: RV-List: rough running during taxi after landing YEP. Exact same problem. Keep the boost pump on and the RPMs above 1000. Install a fuel pump cooling shroud. On hot days, the problem does not go away, just have to learn to manage it. Bob ----- Original Message ----- From: thomas sargent To: rv-list Sent: Wednesday, June 13, 2012 2:15 PM Subject: RV-List: rough running during taxi after landing This is a question for all of you who have AirFlow Performance fuel injection, as I do on mt RV-6A. When I start up and taxi around prior to take off, I have no problem, even in warm Arizona weather. However, after I've been flying and return to land, taxiing is a problem. The engine runs very unevenly and almost stops completely some times. The guys at AFP, and I think they are right, say it is fuel vaporizing in the skinny stainless steel lines that go from the spider to the injector nozzles. "These planes do that." I notice on a warm day when I hit the brakes to slow down for a turn, it always gets worse, as though the slight decrease in air moving through the cowl aggravates the vaporization. Turning on the boost pump has no effect. I should mention that I have a fiberglass cooling plenum which means there is a bit less enclosed volume over the engine than there would be if I'd use the stock baffling scheme that has the airseal fabric pressing against the top of the cowl. I one time had the thing stop completely as I was turning off the runway and heard the tower advise the next aircraft to go around. Embarassing, but at least, I can always restart the engine quickly. If the fuel flow is a bit higher than you'd use for taxi, the engine smooths out - also consistent with fuel vaporization. Does anybody else have this same problem? -- Tom Sargent, RV-6A N811WT ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV-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/rv-list Browse Digests http://www.matronics.com/digest/rv-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.