---------------------------------------------------------- Engines-List Digest Archive --- Total Messages Posted Sat 01/03/09: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:16 PM - Re: Lousy Idle (Miguel Azevedo) ________________________________ Message 1 _____________________________________ Time: 05:16:57 PM PST US From: "Miguel Azevedo" Subject: Re: Engines-List: Lousy Idle Dean, Have you notice any symptons of engine running richer and richer as the idle slows down? Like brown smoke coming out of exhaust? If you have a paper air filter, try without it. I've seen some paper filters clog up under higher temps. Cheers, Miguel Azevedo N8714D PA22/20-150 On Wed, Dec 31, 2008 at 3:42 PM, DEAN PSIROPOULOS < dean.psiropoulos@verizon.net> wrote: > dean.psiropoulos@verizon.net> > > Anyone have a few words of wisdom for me: > > I'm pulling my hair out over a crappy engine idle that I can't seem to > tame. > The basic problem is that I'll start the engine and it fires right up and > runs at about 700-750 RPM just like the book says it should. But from > there, all it seems to want to do is gradually idle slower and slower as > the > engine warms up until it barely runs (between 450-500 RPM) by the time I've > done all my checks and am ready to take the runway for takeoff. > > > The engine is a new Mattituck built TMX-IO360 Lycoming clone with > Lightspeed > electronic ignition on one side and a magneto on the other. It also has > Airflow Performance fuel injection with purge valve, a Sterba wood prop and > Mark Landoll's 11 pound steel inertia ring bolted to the flywheel. The > configuration is updraft with the AFP fuel controller bolted to the bottom > of the sump (like carbureted engines) and uses Van's airbox. I've read the > AFP manual and talked to the tech there and adjusted the idle mixture and > stop numerous times but I can't seem to stabilize it. When I have the > cowling off, I make the adjustments and taxi around a bit to warm up the > engine and it seems to be ok. Then I'll put the cowling back on and the > symptoms seem to reappear. There isn't anything banging against the > cowling > that I can see that would be causing trouble so I'm totally stumped! > > Anyone else having this problem? I'm flying out of a long but narrow strip > with trees on three sides and no good places to land near the airport. > Needless to say it makes me nervous, even though the engine runs strong > just > off idle and at full power. Thanks. > > Dean Psiropoulos > RV-6A N197DM > 4.1 hours > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message engines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Engines-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/engines-list Browse Digests http://www.matronics.com/digest/engines-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.