---------------------------------------------------------- JabiruEngine-List Digest Archive --- Total Messages Posted Thu 11/08/07: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:13 PM - Re: Carb jet changes (avidflyer01) 2. 11:34 PM - Re: Re: Carb jet changes (Peter Harris) ________________________________ Message 1 _____________________________________ Time: 09:13:19 PM PST US Subject: JabiruEngine-List: Re: Carb jet changes From: "avidflyer01" Lynn,I also noticed that if I remove the SCAT tube which connects the carb to the air filter, there is some petrol sitting there (if the engine has just been running); I also experience some troubles as to idle, if I reduce power to around 800rpm the engine will progressively start slowing down and will eventually quit after some 30-45secs (as it occasionally does on final if I don't baby it with throttle). exhaust is definitely sooty in spite of high EGT in flight. I will try putting a new idle/seat; it sounds surprising, though, because I would expect to find a puddle of gas under the plane if left with a valve open - which is not the case in my plane. martin avid flyer STOL HH w/Jab2200 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=144710#144710 ________________________________ Message 2 _____________________________________ Time: 11:34:34 PM PST US From: "Peter Harris" Subject: RE: JabiruEngine-List: Re: Carb jet changes Martin, 1. The needle valve seat supplied is 2.25mm meant for gravity feed and Bing specify a 1.5mm seat for pump feed. The 2.25mm seat leaks under pump pressure causing an excessive rich mixture but this normally is worse at the higher throttle settings. 2. When throttle is reduced quickly some excess unused fuel runs back down the induction tubes and floods through the top of the carby. and into the scat. Peter H -----Original Message----- From: owner-jabiruengine-list-server@matronics.com [mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of avidflyer01 Sent: Friday, 9 November 2007 3:13 PM Subject: JabiruEngine-List: Re: Carb jet changes Lynn,I also noticed that if I remove the SCAT tube which connects the carb to the air filter, there is some petrol sitting there (if the engine has just been running); I also experience some troubles as to idle, if I reduce power to around 800rpm the engine will progressively start slowing down and will eventually quit after some 30-45secs (as it occasionally does on final if I don't baby it with throttle). exhaust is definitely sooty in spite of high EGT in flight. I will try putting a new idle/seat; it sounds surprising, though, because I would expect to find a puddle of gas under the plane if left with a valve open - which is not the case in my plane. martin avid flyer STOL HH w/Jab2200 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=144710#144710 ------------------------------------------------------------------------------------- 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.