---------------------------------------------------------- JabiruEngine-List Digest Archive --- Total Messages Posted Wed 11/28/07: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 0. 12:29 AM - Wow! A Ton of Comments! (Matt Dralle) 1. 09:32 AM - Rough Engine (Chuck Deiterich) 2. 10:04 AM - Re: Rough Engine (Lynn Matteson) 3. 10:12 AM - Re: Rough Engine () 4. 10:42 AM - Re: Rough Engine (BobbyPaulk@comcast.net) 5. 12:57 PM - Re: Rough Engine (Peter Harris) 6. 01:01 PM - Re: Rough Engine (Peter Harris) 7. 04:18 PM - Re: Stripped Thread Question? (Jeffrey J Paris) ________________________________ Message 0 _____________________________________ Time: 12:29:11 AM PST US From: Matt Dralle Subject: JabiruEngine-List: Wow! A Ton of Comments! Dear Listers, I've been getting a ton of great comments from Listers along with their List Support Contributions lately! I've shared a bunch more below. 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Jim S ________________________________ Message 1 _____________________________________ Time: 09:32:17 AM PST US From: "Chuck Deiterich" Subject: JabiruEngine-List: Rough Engine I have a Jabiru 2200, serial # 988 with 91 hours. It is on a Zenith 701 with a Prince P-Tip prop 64X26. During the last couple of flights I noticed some vibration starting a couple of minutes after takeoff while still climbing at wide open throttle (about 3000 rpm). Throttling back to 2800 rpm the vibration went away. But climbing later in flight at wide open throttle the vibration returned, the vibration was not bad but noticeable. On my most recent flight, the vibration started again a couple of minutes into the flight. Later in flight to climb the vibration got very bad (rough) and shook the whole airplane. Throttling back it was a smooth as glass. It seemed that the vibration would now start before wide open throttle and also carb heat seemed to make it worse. I throttled back to 2800 rpm and headed for home and landed in about 10 minutes. Engine was smooth. I periodically check the exhaust pipes for soot. Usually there would be a little on my finger, but this past flight it was very black and completely covered the end of my finger. Any suggestions as to what the problem is and how to fix it? Thanks, Chuck D. N701TX ________________________________ Message 2 _____________________________________ Time: 10:04:32 AM PST US From: Lynn Matteson Subject: Re: JabiruEngine-List: Rough Engine The blackness might be an indication of high fuel level, caused by a stuck open or leaky float needle valve/seat. My 2200 exhibited a roughness at idle and I traced it to a leaky needle valve and/or seat, and replacing them (with a smaller size, by the way) cured my problem. It could be that yours likes to leak at WOT instead of like mine, which was at idle. Lynn Matteson Grass Lake, Michigan Kitfox IV Speedster w/Jabiru 2200 flying w/440+ hrs On Nov 28, 2007, at 12:27 PM, Chuck Deiterich wrote: > I have a Jabiru 2200, serial # 988 with 91 hours. > It is on a Zenith 701 with a Prince P-Tip prop 64X26. > > During the last couple of flights I noticed some vibration starting > a couple of minutes after takeoff while still climbing at wide open > throttle (about 3000 rpm). Throttling back to 2800 rpm the > vibration went away. But climbing later in flight at wide open > throttle the vibration returned, the vibration was not bad but > noticeable. > On my most recent flight, the vibration started again a couple of > minutes into the flight. Later in flight to climb the vibration > got very bad (rough) and shook the whole airplane. Throttling back > it was a smooth as glass. It seemed that the vibration would now > start before wide open throttle and also carb heat seemed to make > it worse. I throttled back to 2800 rpm and headed for home and > landed in about 10 minutes. Engine was smooth. > > I periodically check the exhaust pipes for soot. Usually there > would be a little on my finger, but this past flight it was very > black and completely covered the end of my finger. > > Any suggestions as to what the problem is and how to fix it? > Thanks, > Chuck D. > N701TX > ============================================================ _- > forums.matronics.com_- > =========================================================== ________________________________ Message 3 _____________________________________ Time: 10:12:16 AM PST US From: Subject: Re: JabiruEngine-List: Rough Engine Seems like you are running too rich at high throttle settings Chuck. First thing to check would be the float valve. Make sure that when you drop the bowl off the carb (carefully to prevent spilling any fuel) you should have about 7/16" from the fuel level to the edge of the bowl. Your mid-range jet and needle may be keeping the mixture corectly until you open up enough to run on the main jet alone. Could be an adjustment problem or something preventing the valve from seating fully. Second, make sure that the balance line from the carb to the airbox is in place securely at both ends. Third, check the airfilter and airbox/scat tube/NACA scoop for obstructions. Finally, make sure that the enrichment circuit (choke) is not being activated as you open the throttle. Keep us posted on what you find and how it all shakes out. Dred ---- Chuck Deiterich wrote: > I have a Jabiru 2200, serial # 988 with 91 hours. > It is on a Zenith 701 with a Prince P-Tip prop 64X26. > > During the last couple of flights I noticed some vibration starting a couple of minutes after takeoff while still climbing at wide open throttle (about 3000 rpm). Throttling back to 2800 rpm the vibration went away. ________________________________ Message 4 _____________________________________ Time: 10:42:20 AM PST US From: BobbyPaulk@comcast.net Subject: Re: JabiruEngine-List: Rough Engine ________________________________ Message 5 _____________________________________ Time: 12:57:29 PM PST US From: "Peter Harris" Subject: RE: JabiruEngine-List: Rough Engine Chuck, I had minor to moderate patches of vibration in the J3300 so when we had a week of bad weather I spent three days static balancing the prop very carefully with the spinner and backing plate. Next flight when turning left and decelerating I had major vibration shaking the cowl and reduced throttle had no immediate effect. It was scary. I got a dynamic balance done and we had to add a 1'4" bolt X3/4 long with washer and nut to the backing plate. >From the first start it was like a different engine even in the hangar it was very noticeable. It is clear to me that the engine itself was out of balance and I have now compensated for the problem. My prop/spinner assembly is now no way static balanced. I think the broken flywheel bolts could be due to poorly balanced engines. I would recommend a dynamic balance. You need to mark the boss and the prop and backing plate when the job is done for reassembly. Peter H _____ From: owner-jabiruengine-list-server@matronics.com [mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of Chuck Deiterich Sent: Thursday, 29 November 2007 3:27 AM Subject: JabiruEngine-List: Rough Engine I have a Jabiru 2200, serial # 988 with 91 hours. It is on a Zenith 701 with a Prince P-Tip prop 64X26. During the last couple of flights I noticed some vibration starting a couple of minutes after takeoff while still climbing at wide open throttle (about 3000 rpm). Throttling back to 2800 rpm the vibration went away. But climbing later in flight at wide open throttle the vibration returned, the vibration was not bad but noticeable. On my most recent flight, the vibration started again a couple of minutes into the flight. Later in flight to climb the vibration got very bad (rough) and shook the whole airplane. Throttling back it was a smooth as glass. It seemed that the vibration would now start before wide open throttle and also carb heat seemed to make it worse. I throttled back to 2800 rpm and headed for home and landed in about 10 minutes. Engine was smooth. I periodically check the exhaust pipes for soot. Usually there would be a little on my finger, but this past flight it was very black and completely covered the end of my finger. Any suggestions as to what the problem is and how to fix it? Thanks, Chuck D. N701TX ________________________________ Message 6 _____________________________________ Time: 01:01:55 PM PST US From: "Peter Harris" Subject: RE: JabiruEngine-List: Rough Engine I agree with Lynn. I also had a problem caused because the start throttle lever was not fully returning due to friction in the cable. This caused over rich running throughout the power range. Peter -----Original Message----- From: owner-jabiruengine-list-server@matronics.com [mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of Lynn Matteson Sent: Thursday, 29 November 2007 4:04 AM Subject: Re: JabiruEngine-List: Rough Engine The blackness might be an indication of high fuel level, caused by a stuck open or leaky float needle valve/seat. My 2200 exhibited a roughness at idle and I traced it to a leaky needle valve and/or seat, and replacing them (with a smaller size, by the way) cured my problem. It could be that yours likes to leak at WOT instead of like mine, which was at idle. Lynn Matteson Grass Lake, Michigan Kitfox IV Speedster w/Jabiru 2200 flying w/440+ hrs On Nov 28, 2007, at 12:27 PM, Chuck Deiterich wrote: > I have a Jabiru 2200, serial # 988 with 91 hours. > It is on a Zenith 701 with a Prince P-Tip prop 64X26. > > During the last couple of flights I noticed some vibration starting > a couple of minutes after takeoff while still climbing at wide open > throttle (about 3000 rpm). Throttling back to 2800 rpm the > vibration went away. But climbing later in flight at wide open > throttle the vibration returned, the vibration was not bad but > noticeable. > On my most recent flight, the vibration started again a couple of > minutes into the flight. Later in flight to climb the vibration > got very bad (rough) and shook the whole airplane. Throttling back > it was a smooth as glass. It seemed that the vibration would now > start before wide open throttle and also carb heat seemed to make > it worse. I throttled back to 2800 rpm and headed for home and > landed in about 10 minutes. Engine was smooth. > > I periodically check the exhaust pipes for soot. Usually there > would be a little on my finger, but this past flight it was very > black and completely covered the end of my finger. > > Any suggestions as to what the problem is and how to fix it? > Thanks, > Chuck D. > N701TX > ============================================================ _- > forums.matronics.com_- > =========================================================== ________________________________ Message 7 _____________________________________ Time: 04:18:29 PM PST US Subject: JabiruEngine-List: Re: Stripped Thread Question? From: "Jeffrey J Paris" Thanks Ralph! JJP --- On Wed 11/28, jetboy < sanson.r@xtra.co.nz > wrote: From: jetboy [mailto: sanson.r@xtra.co.nz] Subject: JabiruEngine-List: Re: Stripped Thread Question? _______________________________________________ Join Excite! - http://www.excite.com The most personalized portal on the Web! ------------------------------------------------------------------------------------- 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.