---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Mon 10/31/11: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:23 AM - Re: #3 cylinder miss. (PHILLIPS I) 2. 05:08 AM - Re: #3 cylinder miss. (Thom Riddle) 3. 06:46 AM - Re: single intake manifold for 912 (ronlee) 4. 09:50 AM - Re: #3 cylinder miss. (Ron Hoyt) 5. 09:58 AM - Re: #3 cylinder miss. (Ron Hoyt) 6. 10:33 AM - Re: single intake manifold for 912 (europapa) ________________________________ Message 1 _____________________________________ Time: 01:23:04 AM PST US Subject: Re: RotaxEngines-List: #3 cylinder miss. From: PHILLIPS I The Obvious question Ron was it really missing? did you get a vibration and drop in performance? If not, Then check out the EGT probes and wiring and earthing points, If possible swap the EGT over with another cylinder to see if it swap's sides, regards Ivor On 31 October 2011 02:20, Ron Hoyt wrote: > > I am looking for ideas as to what might cause the following: > > On the first flight after about 1/2 hr the #3 cylinder exhaust temp went > to approximately 250 degrees. All other cylinders showed the normal temp of > about 1200 degrees. This occurred when the RPM was reduced to the low 4000 > range and continued down into the 3000 range. During the final to the > runway the engine was idled and the cold exhaust returned to normal. > > After landing the engine was given a MAG test and both MAGs worked > normally At 3500 rpm. > > The plugs were pulled and all looked normal, Grayish white porcelain, dry > and no soot. > > I believe the ignition is a wasted spark which means that I should have > more than 1 cylinder show the failure if it was the ignition system. > > Could it be a sticky valve? > > Any other ideas? > > Thanks for any feedback > Ron Hoyt > N232S > > ________________________________ Message 2 _____________________________________ Time: 05:08:41 AM PST US From: Thom Riddle Subject: Re: RotaxEngines-List: #3 cylinder miss. Assuming you are talking about a 912 engine, 1200F is not normal for normal cruise rpms. That is low. 912 EGTs are normally in the 1400-1450 range at 5000rpm or higher, unless you are flying at very high density altitudes, in which case they could be down in the low to mid 1300 range. Thom in Buffalo On Mon, Oct 31, 2011 at 4:20 AM, PHILLIPS I wrote: > The Obvious question Ron was it really missing? did you get a vibration > and drop in performance? If not, Then check out the EGT probes and > wiring and earthing points, > If possible swap the EGT over with another cylinder to see if it swap's > sides, > > regards > Ivor > > > On 31 October 2011 02:20, Ron Hoyt wrote: > >> >> I am looking for ideas as to what might cause the following: >> >> On the first flight after about 1/2 hr the #3 cylinder exhaust temp went >> to approximately 250 degrees. All other cylinders showed the normal temp of >> about 1200 degrees. This occurred when the RPM was reduced to the low 4000 >> range and continued down into the 3000 range. During the final to the >> runway the engine was idled and the cold exhaust returned to normal. >> >> After landing the engine was given a MAG test and both MAGs worked >> normally At 3500 rpm. >> >> The plugs were pulled and all looked normal, Grayish white porcelain, dry >> and no soot. >> >> I believe the ignition is a wasted spark which means that I should have >> more than 1 cylinder show the failure if it was the ignition system. >> >> Could it be a sticky valve? >> >> Any other ideas? >> >> Thanks for any feedback >> Ron Hoyt >> N232S >> >> ====**==============================**= >> -List" target="_blank">http://www.matronics.com/** >> Navigator?RotaxEngines-List >> ====**==============================**= >> http://forums.matronics.com >> ====**==============================**= >> le, List Admin. >> ="_blank">http://www.matronics.com/**contribution >> ====**==============================**= >> >> >> >> > * > > * > > ________________________________ Message 3 _____________________________________ Time: 06:46:49 AM PST US Subject: RotaxEngines-List: Re: single intake manifold for 912 From: "ronlee" I am with you on that one. One may loose a bit of power with only one carb but make life easier. As for fuel injection that is another concern. I had a Hirth with fuel injection that ran well until I lost my charging system. To make a long story short I did make it back to the airport, but only because the voltage didn't drop below 10.4 volts as that is where the injection computer stops working. Thank goodness for a flashing light on my EIS I knew the charging system quit . -------- Ron Lee Tucson, Arizona Read this topic online here: http://forums.matronics.com/viewtopic.php?p=356416#356416 ________________________________ Message 4 _____________________________________ Time: 09:50:50 AM PST US From: Ron Hoyt Subject: Re: RotaxEngines-List: #3 cylinder miss. Yes the engine vibration increased. The drop in performance was masked by the throttle reduction I'll check the probes anyway. Thanks Ron On 10/31/2011 2:20 AM, PHILLIPS I wrote: > The Obvious question Ron was it really missing? did you get a vibration > and drop in performance? If not, Then check out the EGT probes and > wiring and earthing points, > If possible swap the EGT over with another cylinder to see if it swap's > sides, > > regards > Ivor > > > On 31 October 2011 02:20, Ron Hoyt wrote: > >> --> RotaxEngines-List message posted by: Ron Hoyt >> >> I am looking for ideas as to what might cause the following: >> >> On the first flight after about 1/2 hr the #3 cylinder exhaust temp went >> to approximately 250 degrees. All other cylinders showed the normal temp of >> about 1200 degrees. This occurred when the RPM was reduced to the low 4000 >> range and continued down into the 3000 range. During the final to the >> runway the engine was idled and the cold exhaust returned to normal. >> >> After landing the engine was given a MAG test and both MAGs worked >> normally At 3500 rpm. >> >> The plugs were pulled and all looked normal, Grayish white porcelain, dry >> and no soot. >> >> I believe the ignition is a wasted spark which means that I should have >> more than 1 cylinder show the failure if it was the ignition system. >> >> Could it be a sticky valve? >> >> Any other ideas? >> >> Thanks for any feedback >> Ron Hoyt >> N232S >> >> >> >> >> > ________________________________ Message 5 _____________________________________ Time: 09:58:56 AM PST US From: Ron Hoyt Subject: Re: RotaxEngines-List: #3 cylinder miss. You are correct, the egt was in the high 1400, just below 1500 and the OAT was 33 deg. at 3800 ft where the engine was operating fine. The plugs indicate the engine was slightly on the lean side of combustion. Thanks Ron On 10/31/2011 6:05 AM, Thom Riddle wrote: > Assuming you are talking about a 912 engine, 1200F is not normal for normal > cruise rpms. That is low. 912 EGTs are normally in the 1400-1450 range at > 5000rpm or higher, unless you are flying at very high density altitudes, in > which case they could be down in the low to mid 1300 range. > > Thom in Buffalo > > On Mon, Oct 31, 2011 at 4:20 AM, PHILLIPS Iwrote: > >> The Obvious question Ron was it really missing? did you get a vibration >> and drop in performance? If not, Then check out the EGT probes and >> wiring and earthing points, >> If possible swap the EGT over with another cylinder to see if it swap's >> sides, >> >> regards >> Ivor >> >> >> >> On 31 October 2011 02:20, Ron Hoyt wrote: >> >>> --> RotaxEngines-List message posted by: Ron Hoyt >>> >>> I am looking for ideas as to what might cause the following: >>> >>> On the first flight after about 1/2 hr the #3 cylinder exhaust temp went >>> to approximately 250 degrees. All other cylinders showed the normal temp of >>> about 1200 degrees. This occurred when the RPM was reduced to the low 4000 >>> range and continued down into the 3000 range. During the final to the >>> runway the engine was idled and the cold exhaust returned to normal. >>> >>> After landing the engine was given a MAG test and both MAGs worked >>> normally At 3500 rpm. >>> >>> The plugs were pulled and all looked normal, Grayish white porcelain, dry >>> and no soot. >>> >>> I believe the ignition is a wasted spark which means that I should have >>> more than 1 cylinder show the failure if it was the ignition system. >>> >>> Could it be a sticky valve? >>> >>> Any other ideas? >>> >>> Thanks for any feedback >>> Ron Hoyt >>> N232S >>> >>> ====**==============================**= >>> -List" target="_blank">http://www.matronics.com/** >>> Navigator?RotaxEngines-List >>> ====**==============================**= >>> http://forums.matronics.com >>> ====**==============================**= >>> le, List Admin. >>> ="_blank">http://www.matronics.com/**contribution >>> ====**==============================**= >>> >>> >>> >>> >> * >> >> * >> >> > ________________________________ Message 6 _____________________________________ Time: 10:33:01 AM PST US Subject: RotaxEngines-List: Re: single intake manifold for 912 From: "europapa" Hi Ron, thank you for your reply. So many modifications have been developed for the Rotax 912 by people that would like to make it better but I cant find a single publishment of the idea I had. May be it is something wrong with it. The Rotec TBI doesn't need electricity, so give me an intake spider and Ill try it. I just kicked my vacuum pump and now there would be space. Regards Juergen Read this topic online here: http://forums.matronics.com/viewtopic.php?p=356433#356433 ------------------------------------------------------------------------------------- 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.