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
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| Subject: | Wow! A Ton of Comments! |
Dear Listers,
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Matronics Email List Administrator
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Message 1
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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
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| Subject: | Re: 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
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| Subject: | Re: 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 <cffd@pgrb.com> 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
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| Subject: | Re: Rough Engine |
Message 5
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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
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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
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| Subject: | Re: Stripped Thread Question? |
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?
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