---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Wed 01/07/09: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:01 PM - Re: Rejetting a 914 during Winter? (Roger Lee) 2. 06:36 PM - Re: Re: Rejetting a 914 during Winter? (Ivan) 3. 08:04 PM - Re: Rejetting a 914 during Winter? (darinh) ________________________________ Message 1 _____________________________________ Time: 06:01:19 PM PST US Subject: RotaxEngines-List: Re: Rejetting a 914 during Winter? From: "Roger Lee" Don't worry about the jetting. Re-pitch the prop. You will loose 100-125 engine rpm due to the colder denser winter air verses the warmer summer air with the prop. We do it in Tucson all the time. The summer temps are 90 F + and the winter mornings are 32-40F. You will run better. Take out approximately 1/2 degree to pick up another 100 rpm. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Service Center 520-574-1080 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=223466#223466 ________________________________ Message 2 _____________________________________ Time: 06:36:54 PM PST US From: "Ivan" Subject: Re: RotaxEngines-List: Re: Rejetting a 914 during Winter? Why are we flattening the prop pitch? Are we doing this for better climb or are we doing this for mixture control with the Bing altitude compensating carburetor having a needle to control the mixture rather than a mixture control? I thought flattening the prop will make it run leaner and we want to richen up things a bit for the winter? I am confused about something. Ivan ----- Original Message ----- From: "Roger Lee" Sent: Wednesday, January 07, 2009 6:57 PM Subject: RotaxEngines-List: Re: Rejetting a 914 during Winter? > > Don't worry about the jetting. Re-pitch the prop. You will loose 100-125 > engine rpm due to the colder denser winter air verses the warmer summer > air with the prop. We do it in Tucson all the time. The summer temps are > 90 F + and the winter mornings are 32-40F. You will run better. Take out > approximately 1/2 degree to pick up another 100 rpm. > > -------- > Roger Lee > Tucson, Az. > Light Sport Repairman - Maintenance Rated > Rotax Service Center > 520-574-1080 > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=223466#223466 > > > ________________________________ Message 3 _____________________________________ Time: 08:04:37 PM PST US Subject: RotaxEngines-List: Re: Rejetting a 914 during Winter? From: "darinh" Roger, Thanks for the post but I have an Airmasters CS prop so that is not the issue. It is not a problem with load on the prop, rather when it hits the top 10% of throttle, it runs a bit rough as though it is jetted wrong. My understanding is that the main jet controls the top end and the engine is smooth as silk through the the range from idle to approximately 90% throttle then is runs rough so this is why I was thinking it may have something to do with the main jetting. -------- Darin Hawkes Series 7 914 Turbo Kaysville, Utah Read this topic online here: http://forums.matronics.com/viewtopic.php?p=223487#223487 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-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/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-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.