---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Wed 09/15/21: 11 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:45 AM - Re: Carb Balancing (Area-51) 2. 01:47 AM - Fuel tank vent overflowing during climb (JohnFrance) 3. 02:29 AM - Re: Carb Balancing (davidjoyce@doctors.org.uk) 4. 03:13 AM - Re: Carb Balancing (budyerly@msn.com) 5. 04:18 AM - Re: Carb Balancing (h&jeuropa) 6. 04:23 AM - Re: Carb Balancing (GTH) 7. 04:23 AM - Re: Fuel tank vent overflowing during climb (h&jeuropa) 8. 05:05 AM - Re: Fuel tank vent overflowing during climb (JohnFrance) 9. 05:57 AM - Re: Carb Balancing (William Daniell) 10. 08:29 AM - Re: Carb Balancing (D McFadyean) 11. 12:02 PM - Re: Carb Balancing (Mallard) ________________________________ Message 1 _____________________________________ Time: 12:45:16 AM PST US Subject: Europa-List: Re: Carb Balancing From: "Area-51" What input data at 3500rpm makes you think its a carburettor related issue? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=503149#503149 ________________________________ Message 2 _____________________________________ Time: 01:47:59 AM PST US Subject: Europa-List: Fuel tank vent overflowing during climb From: "JohnFrance" <77alembert@gmail.com> Hi All, Once again, read one time too many, the top fuselage fuel tank vent mounted just in front of the fuel filler (classic) has dribbled out fuel during the climb and once due to expansion of the fuel with a nearly full tank while on the ground! I have added a reservoir in the shape of a large fuel filter in the vent line high up in the fuselage in the hope that it would allow air to pass by while keeping the fuel inside the aircraft. This has made a marginal improvement but not cured the problem. I am thinking a second vent in the bottom of the fuselage is the way to go. Has anyone done this, what was the shape, position and direction of the lower vent tube and can you supply any details and photos of your installation please? Thanks in advance, John -------- Europa mono Nr 192 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=503152#503152 ________________________________ Message 3 _____________________________________ Time: 02:29:46 AM PST US From: davidjoyce@doctors.org.uk Subject: Re: Europa-List: Carb Balancing I would look seriously at the possibility that you have air leaking into the carburettor bowl. This now seems to be a fairly common issue with older 914s that still have the old paper gaskets. Typically folk spend months and a small fortune trying to work out what is happening before replacing the gaskets with the new Rotax rubber ones and 'living happily ever after!' Tends to produce very rough running at 3500+ rpm and reluctance to produce any greater revs - very disturbing if taking off from a short runway! Look out the article in Europa Flyer a year or two ago by Jim Butcher (assuming you are in the club it is available and searchable on the website). David Joyce, GXSDJ On 2021-09-14 22:53, Mallard wrote: > > Has anyone had the experience of balancing the carbs on a Rotax 912 > type engine and after a couple of hours of smooth running across all > revs you suddenly get rough running at 3500 rpm. > > If you experienced a similar situation, how did you deal with it? > > I'd also be interested to hear from any 914 owners on the forum who > have had the above 'Carb Balancing' problems & what was done to keep > the Carbs Balanced? > > Thanks for any contributions. > James > > -------- > Seat of my pants > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=503143#503143 > ________________________________ Message 4 _____________________________________ Time: 03:13:25 AM PST US Subject: Europa-List: Re: Carb Balancing From: "budyerly@msn.com" Attached is a Rotax Troubleshooting guide that was updated this year. Most likely if smooth at idle with good carb balance you may have any of a few other issues. Spend time on the Rotax Owners.com and the videos. Rotax rebuild and tuning info is there. My article is long and boring also but may shed some insight. Best Regards, Bud Yerly Read this topic online here: http://forums.matronics.com/viewtopic.php?p=503154#503154 Attachments: http://forums.matronics.com//files/rotax_engine_troubleshooting_yerly_april_2021_105.pdf ________________________________ Message 5 _____________________________________ Time: 04:18:49 AM PST US Subject: Europa-List: Re: Carb Balancing From: "h&jeuropa" Bud's troubleshooting guide is also available on the Europa Club website. You can use the search function on any page on the website to find information related to this problem. Jim Butcher Read this topic online here: http://forums.matronics.com/viewtopic.php?p=503155#503155 ________________________________ Message 6 _____________________________________ Time: 04:23:04 AM PST US Subject: Re: Europa-List: Carb Balancing From: GTH Le 14/09/2021 23:53, Mallard a crit: > anyone had the experience of balancing the carbs on a Rotax 912 type > engine and after a couple of hours of smooth running across all revs > you suddenly get rough running at 3500 rpm. If you experienced a > similar situation, how did you deal with it? I'd also be interested to > hear from any 914 owners on the forum who have had the above 'Carb > Balancing' problems & what was done to keep the Carbs Balanced? / Hi all, Here is some info concerning our 914 UL and some other engines. We never had any carb synch issues, but 1) We never disconnected the cables from the throttle levers. 2) We have a mechanical stop on the throttle lever so as to never exert any force to the carb lever stops. It is our experience that many buddies and hangar mates complaining about carb losing synch invariably happen to not have a stop on the lever, and so are likely to distort the carb lever stops. Summarized some info here : http://contrails.free.fr/engine_rotax_stops.php Among the carb issues we heard of, are the change in float bowl gasket thickness. An engine rough running was driving a buddy mechanic mad, until we discussed carb gaskets, and it appeared that some Rotax dealer-supplied gaskets were too thin, raising the bottom of the bowl too close to the main jet and impairing the flow into the main jet. FWIW, -- Best regards Gilles http://contrails.free.fr http://lapierre.skunkworks.free.fr ________________________________ Message 7 _____________________________________ Time: 04:23:32 AM PST US Subject: Europa-List: Re: Fuel tank vent overflowing during climb From: "h&jeuropa" John, Look in the Bud Yerly articles on the club website for his suggestion on doing this. We did it during the initial build and basically used the factory vent pipe facing forward but shielded by the fairing for the stbd side flap actuator hinge. It will get dirt in it so during every inspection, we blow it out with solvent to ensure it is clear. Sorry no photo, but could take one next time at airport if desired. Jim & Heather Read this topic online here: http://forums.matronics.com/viewtopic.php?p=503156#503156 ________________________________ Message 8 _____________________________________ Time: 05:05:21 AM PST US Subject: Europa-List: Re: Fuel tank vent overflowing during climb From: "JohnFrance" <77alembert@gmail.com> Thanks Jim Do not archive -------- Europa mono Nr 192 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=503158#503158 ________________________________ Message 9 _____________________________________ Time: 05:57:53 AM PST US From: William Daniell Subject: Re: Europa-List: Carb Balancing I agree with David - I had air being sucked into my bowls but only above 11500. Nitrile is the way to go. William Daniell LONGPORT +1 786 878 0246 On Wed, Sep 15, 2021 at 5:32 AM wrote: > I would look seriously at the possibility that you have air leaking into > the carburettor bowl. This now seems to be a fairly common issue with old er > 914s that still have the old paper gaskets. Typically folk spend months a nd > a small fortune trying to work out what is happening before replacing the > gaskets with the new Rotax rubber ones and =98living happily ever a fter!=99 > Tends to produce very rough running at 3500+ rpm and reluctance to produ ce > any greater revs - very disturbing if taking off from a short runway! Loo k > out the article in Europa Flyer a year or two ago by Jim Butcher (assumin g > you are in the club it is available and searchable on the website). David > Joyce, GXSDJ > > > On 2021-09-14 22:53, Mallard wrote: > > > Has anyone had the experience of balancing the carbs on a Rotax 912 type > engine and after a couple of hours of smooth running across all revs you > suddenly get rough running at 3500 rpm. > > If you experienced a similar situation, how did you deal with it? > > I'd also be interested to hear from any 914 owners on the forum who have > had the above 'Carb Balancing' problems & what was done to keep the Carbs > Balanced? > > > Thanks for any contributions. > James > > -------- > Seat of my pants > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=503143#5bsp;--> > http://www.m atronics.com/Navigator >  f="http://forums.matronics.com" target="_blank" > rel="noopener noreferf="http://wiki.matronics.com" target="_blank" > rel="noopener noreferre================ ======= > http://www.matronics================= === > > > > > ________________________________ Message 10 ____________________________________ Time: 08:29:42 AM PST US From: D McFadyean Subject: Re: Europa-List: Carb Balancing Or Viton. > On 15 September 2021 at 13:57 William Daniell wrote: > > I agree with David - I had air being sucked into my bowls but only ab ove 11500. Nitrile is the way to go. > William Daniell > LONGPORT > +1 786 878 0246 > > > On Wed, Sep 15, 2021 at 5:32 AM wrote: > > > > > > I would look seriously at the possibility that you have air lea king into the carburettor bowl. This now seems to be a fairly common issue with older 914s that still have the old paper gaskets. Typically folk spend months and a small fortune trying to work out what is happening before rep lacing the gaskets with the new Rotax rubber ones and =98living happi ly ever after!=99 Tends to produce very rough running at 3500+ rpm a nd reluctance to produce any greater revs - very disturbing if taking off f rom a short runway! Look out the article in Europa Flyer a year or two ago by Jim Butcher (assuming you are in the club it is available and searchable on the website). David Joyce, GXSDJ > > > > > > > > > > On 2021-09-14 22:53, Mallard wrote: > > rd" > > > > > > Has anyone had the experience of balancing the carbs on a Rotax 912 type engine and after a couple of hours of smooth running across all revs you suddenly get rough running at 3500 rpm. > > > > > > If you experienced a similar situation, how did you deal with it? > > > > > > I'd also be interested to hear from any 914 owners on the forum who have had the above 'Carb Balancing' problems & what was done to keep the Carbs Balanced? > > > > > > > > > Thanks for any contributions. > > > James > > > > > > -------- > > > Seat of my pants > > > > > > > > > > > > > > > Read this topic online here: > > > > > > http://forums.matronics.com/viewtopic.php?p=503143#5bsp ;--> http://forums.matronics.com/viewtopic.php?p=503143#503143 http://www .matronics.com/Navigator=  f="http://forums.matronics.co m" target="_blank" rel="noopener noreferf="http://wiki.matronics.com" target="_blank" rel="noopener noreferre========== ==============http://www.matronics==== ================ > > > > > > > > > > > > http://www.matronics.com/Navigator?Europa-List > > > > > > > > > > > ________________________________ Message 11 ____________________________________ Time: 12:02:43 PM PST US Subject: Europa-List: Re: Carb Balancing From: "Mallard" Thanks for your assistance David but fortunately the problem isn't as bad as that, at least not yet! The engine is producing normal power all the way from idle up to & including turbo boost. It just runs a bit rough @ 3500rpm. We didn't notice it while flying & only spotted it while sitting on the ground & holding the throttle steady @ 3500rpm. Btw, during the last annual inspection the Carb floats were changed by my engineer using the Rotax supplied (foc) kit which I'm fairly sure included the Rubber gaskets. Also, When we balanced the carbs we stopped all the vibrations which were present pretty much throughout the full rpm range. The vibrations were so bad it initially felt like the prop was out of balance. Regards James davidjoyce(at)doctors.org wrote: > I would look seriously at the possibility that you have air leaking into the carburettor bowl. This now seems to be a fairly common issue with older 914s that still have the old paper gaskets. Typically folk spend months and a small fortune trying to work out what is happening before replacing the gaskets with the new Rotax rubber ones and ‘living happily ever after!’ Tends to produce very rough running at 3500+ rpm and reluctance to produce any greater revs - very disturbing if taking off from a short runway! Look out the article in Europa Flyer a year or two ago by Jim Butcher (assuming you are in the club it is available and searchable on the website). David Joyce, GXSDJ > > > On 2021-09-14 22:53, Mallard wrote: > > > -------- Seat of my pants Read this topic online here: http://forums.matronics.com/viewtopic.php?p=503161#503161 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-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/europa-list Browse Digests http://www.matronics.com/digest/europa-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.