---------------------------------------------------------- JabiruEngine-List Digest Archive --- Total Messages Posted Tue 05/06/08: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 10:27 AM - Re: Re: JabiruEngine-List Digest: 3 Msgs - 05/04/08 (Lynn Matteson) ________________________________ Message 1 _____________________________________ Time: 10:27:01 AM PST US From: Lynn Matteson Subject: Re: JabiruEngine-List: Re: JabiruEngine-List Digest: 3 Msgs - 05/04/08 Peter- I envy you guys who have the room to build/install a plenum/manifold. I do not, or I'd be doing it....I'd love to see yours when finished. Lynn Matteson Grass Lake, Michigan Kitfox IV Speedster w/Jabiru 2200 flying w/503+ hrs do not archive On May 5, 2008, at 5:36 PM, Peter Harris wrote: > Bob, > > I replaced the Bing with a simple throttle body and two injectors. > I have a potentiometer to over ride the ECU if necessary and this > was useful when fixing fuel maps . I am monitoring EGT at #5 and > #6. With the present map settings I have even EGT (about 690degC) > at TOC but if I leave the throttle open and accelerate I see EGT 5 > goes to 780degC ie almost 100 deg hotter, and the engine starts to > shake because of uneven power strokes R to L. > > I think the problem is caused because there is no intake manifold, > only a 1/2L collector. I am building a 3.5L induction manifold > using 64MM tube fittings and will be able to report on that soon. > > Peter > > > From: owner-jabiruengine-list-server@matronics.com [mailto:owner- > jabiruengine-list-server@matronics.com] On Behalf Of BobsV35B@aol.com > Sent: Tuesday, 6 May 2008 2:28 AM > To: jabiruengine-list@matronics.com > Subject: JabiruEngine-List: Re: JabiruEngine-List Digest: 3 Msgs - > 05/04/08 > > > Good Morning Bob and All, > > > The key point here is that the actual temperature means very little > and there really is NO need for all of them to read the same. What > we really want to know is how close the cylinder is running to a > stoichiometric mixture. Peak EGT occurs close to that mixture. > > > On the lean side of stoichiometric, the engine will run cooler and > on the rich side of stoichiometric, the engine will also run cooler. > > > Since there are so many variables introduced by probe placement and > incidental airflow considerations, the actual temperature IS > immaterial. What we need to do is slowly lean and see just where > each cylinder peaks in relation to fuel flow. I see no way to do > that exercise with Jabiru and it's BMW motorcycle BING carburetor. > > > Cooling or insulating your Lycoming was just messing around. It did > nothing to adjust the mixture and that is what is important. > > > I sure wish someone would come up with a method whereby we could > lean the Jabiru so as to determine just how well balanced the > mixtures actually are. > > > On your Lycoming, that is fairly easy to do IF you have a good all > cylinder monitor and a very accurate electronic fuel flow unit. > > > Happy Skies, > > Old Bob > AKA > Bob Siegfried > Ancient Aviator > 628 West 86th Street > Downers Grove, IL 60516 > 630 985-8502 > Stearman N3977A > Brookeridge Air Park LL22 > > > In a message dated 5/5/2008 10:11:36 A.M. Central Daylight Time, > rtmarshall@gotsky.com writes: > > > > Hello Jabiru users, On your Egt issues while not flying one,I have > a lyc, I > was having some of the same issues a while back and in particular on a > cylinder that would not come up to within a few degrees of all the > rest, > even after changing the injector nozzle, it was way cold. the > reason was, > the cooling air going by the out side of the EGT probe, I wrapped > the pipe > down about six inches and the temp came up. ! IMHO and FWIW. Bob > > > Wondering what's for Dinner Tonight? Get new twists on family > favorites at AOL Food. > > http://www.matronics.com/Navigator?JabiruEngine-Listhttp:// > forums.matronics.comhttp://www.matronics.com/contribution > forums.matronics.com_- > ============================================================ _- > contribution_- > =========================================================== ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message jabiruengine-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/JabiruEngine-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/jabiruengine-list Browse Digests http://www.matronics.com/digest/jabiruengine-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.