---------------------------------------------------------- Engines-List Digest Archive --- Total Messages Posted Sun 08/05/12: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:52 AM - Re: Engines-List Digest: 3 Msgs - 08/04/12 (john kent) ________________________________ Message 1 _____________________________________ Time: 06:52:07 AM PST US Subject: Engines-List: Re: Engines-List Digest: 3 Msgs - 08/04/12 From: john kent Just a thought, have you checked your fuel tank venting? J.K. EI-DIY RV4. > > On Aug 3, 2012, at 6:55 PM, Speedy11@aol.com wrote: > >> >> Engine gurus, >> I have a problem with my engine that has me stumped. Maybe someone has seen > this situation before or has an idea for resolution. >> I have a Barrett IO-390 (essentially same as IO-360) that began missing and losing > power in June. I tracked down several "problems" which the solution to > I thought would solve the power loss. I found one spark plug that seemed to be > a problem. Replaced all plugs and tested them before installation. Problem > still there. Checked resistance in harness. All good. Replaced harness anyway. > Problem still there. Sent P Mags back to factory for overhaul. Essentially > have new P Mags now. Problem still there. Cleaned injectors and flow > tested. Flows all equal. Cleaned fuel filter - nothing there. There is no air > filter when I run ram air, so nothing to inhibit air flow. I checked the sniffle > valve but no leak there. >> On takeoff roll there seems to be slightly less power, but the power loss is > more noticeable (approx 20% loss) once airborne. At pattern altitude with reduced > power the engine runs ok. But as I add throttle (high RPM on prop) the engine > loses power as if it is loading up. The EGTs and CHTs are normal. The > RPM and MP are normal. >> So, there you go. Any ideas? >> Stan Sutterfield >> RV-8A. ------------------------------------------------------------------------------------- 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.