Today's Message Index:
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1. 10:05 PM - 3300A - Full Throttle Roughness (Don Honabach)
2. 10:23 PM - Re: 3300A - Full Throttle Roughness (Peter Harris)
3. 10:35 PM - 3300A - Full Throttle Roughness (Don Honabach)
4. 10:58 PM - Re: 3300A - Full Throttle Roughness (Don Honabach)
5. 11:12 PM - Re: 3300A - Full Throttle Roughness (Peter Harris)
Message 1
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| Subject: | 3300A - Full Throttle Roughness |
I'm having an issue where during cruise flight if I go full throttle
either in straight and level or climb, the engine gets rough enough that
it feels like it will quit. At this point, I obviously don't want to
push the issue so I pull back on the throttle until the roughness goes
away.
Interestingly, I have no problem with full throttle roughness on
take-off/climb-out.
I also did some additional testing today and found that if I ease real
slow into full throttle from cruise that I still get the roughness but
not as bad and that the RPM will increase up to ~2,9xx and then start to
degrade as I continue to add power along with additional roughness.
Background info:
Full Throttle Static RPM/Ground Run Up is ~2,800RPM. No issues with
roughness.
On my 601HDS, I have a 3300A with the Sensenich Carbon Prop (64"?
2A0J5R64Z-N) that was purchased from Jabiru USA/Pete K. back in 2006.
Any help greatly appreciated. I've sent this same question to Jabiru USA
and haven't gotten a response yet (sent last Thursday and sent another
today asking for status).
Initially thought it was the SCAT intake hose which I replaced with the
rubber 90 degree elbow. Same issue with either intake method.
Thanks!
Don Honabach
Tempe, AZ
Message 2
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| Subject: | 3300A - Full Throttle Roughness |
It sounds like it may be too rich under the load conditions at WOT cruise.
The fuel bowl is fitted with 2.25mm needle valve seat which is meant for
gravity feed, but they have selected the power needle as a compromise. If
you are using a fuel pump it may cause the needle valve seat to leak and
overfill the fuel bowl causing excessive rich mixture near max rpm.
Another cause of over rich mixture is due to the starting choke not fully
closing due to friction in the cable.
Peter
_____
From: owner-jabiruengine-list-server@matronics.com
[mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of Don
Honabach
Sent: Tuesday, 13 January 2009 4:03 PM
Subject: JabiruEngine-List: 3300A - Full Throttle Roughness
I'm having an issue where during cruise flight if I go full throttle either
in straight and level or climb, the engine gets rough enough that it feels
like it will quit. At this point, I obviously don't want to push the issue
so I pull back on the throttle until the roughness goes away.
Interestingly, I have no problem with full throttle roughness on
take-off/climb-out.
I also did some additional testing today and found that if I ease real slow
into full throttle from cruise that I still get the roughness but not as bad
and that the RPM will increase up to ~2,9xx and then start to degrade as I
continue to add power along with additional roughness.
Background info:
Full Throttle Static RPM/Ground Run Up is ~2,800RPM. No issues with
roughness.
On my 601HDS, I have a 3300A with the Sensenich Carbon Prop (64"?
2A0J5R64Z-N) that was purchased from Jabiru USA/Pete K. back in 2006.
Any help greatly appreciated. I've sent this same question to Jabiru USA and
haven't gotten a response yet (sent last Thursday and sent another today
asking for status).
Initially thought it was the SCAT intake hose which I replaced with the
rubber 90 degree elbow. Same issue with either intake method.
Thanks!
Don Honabach
Tempe, AZ
Message 3
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| Subject: | 3300A - Full Throttle Roughness |
I'm having an issue where during cruise flight if I go full throttle
either in straight and level or climb, the engine gets rough enough that
it feels like it will quit. At this point, I obviously don't want to
push the issue so I pull back on the throttle until the roughness goes
away.
Interestingly, I have no problem with full throttle roughness on
take-off/climb-out.
I also did some additional testing today and found that if I ease real
slow into full throttle from cruise that I still get the roughness but
not as bad and that the RPM will increase up to ~2,9xx and then start to
degrade as I continue to add power along with additional roughness.
Background info:
Full Throttle Static RPM/Ground Run Up is ~2,800RPM. No issues with
roughness.
On my 601HDS, I have a 3300A with the Sensenich Carbon Prop (64"?
2A0J5R64Z-N) that was purchased from Jabiru USA/Pete K. back in 2006.
Any help greatly appreciated. I've sent this same question to Jabiru USA
and haven't gotten a response yet (sent last Thursday and sent another
today asking for status).
Initially thought it was the SCAT intake hose which I replaced with the
rubber 90 degree elbow. Same issue with either intake method.
Thanks!
Don Honabach
Tempe, AZ
Message 4
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| Subject: | 3300A - Full Throttle Roughness |
Peter,
Thanks for the quick reply.
FYI, I have a low-wing design and during take-off I use an electric
boost pump but during transition to cruise I turn it off and just use
the engine driven mechanical fuel pump on the 3300A. Even with the boost
pump, I don't exceed 3PSI (at least as much as I can trust the accuracy
of the gauge at such low values and a narrow range).
Assuming the needle leaking is the issue, is there a fix for non-gravity
feed setups?
As a side question, do those with gravity setups remove the engine
driven pump?
I'm assuming that if I turn on the boost pump during cruise and if I
have a needle leak issue that the problem should be noticeable sooner or
should be worse as the increased pressure will cause more leakage?
I'll check the choke cable as well to make sure it is fully closing.
Thanks!
Don
From: owner-jabiruengine-list-server@matronics.com
[mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of Peter
Harris
Sent: Monday, January 12, 2009 23:21
Subject: RE: JabiruEngine-List: 3300A - Full Throttle Roughness
It sounds like it may be too rich under the load conditions at WOT
cruise.
The fuel bowl is fitted with 2.25mm needle valve seat which is meant for
gravity feed, but they have selected the power needle as a compromise.
If you are using a fuel pump it may cause the needle valve seat to leak
and overfill the fuel bowl causing excessive rich mixture near max rpm.
Another cause of over rich mixture is due to the starting choke not
fully closing due to friction in the cable.
Peter
________________________________
From: owner-jabiruengine-list-server@matronics.com
[mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of Don
Honabach
Sent: Tuesday, 13 January 2009 4:03 PM
Subject: JabiruEngine-List: 3300A - Full Throttle Roughness
I'm having an issue where during cruise flight if I go full throttle
either in straight and level or climb, the engine gets rough enough that
it feels like it will quit. At this point, I obviously don't want to
push the issue so I pull back on the throttle until the roughness goes
away.
Interestingly, I have no problem with full throttle roughness on
take-off/climb-out.
I also did some additional testing today and found that if I ease real
slow into full throttle from cruise that I still get the roughness but
not as bad and that the RPM will increase up to ~2,9xx and then start to
degrade as I continue to add power along with additional roughness.
Background info:
Full Throttle Static RPM/Ground Run Up is ~2,800RPM. No issues with
roughness.
On my 601HDS, I have a 3300A with the Sensenich Carbon Prop (64"?
2A0J5R64Z-N) that was purchased from Jabiru USA/Pete K. back in 2006.
Any help greatly appreciated. I've sent this same question to Jabiru USA
and haven't gotten a response yet (sent last Thursday and sent another
today asking for status).
Initially thought it was the SCAT intake hose which I replaced with the
rubber 90 degree elbow. Same issue with either intake method.
Thanks!
Don Honabach
Tempe, AZ
http://www.matronics.com/Navigator?JabiruEngine-List
http://forums.matronics.com
http://www.matronics.com/contribution
Checked by AVG - http://www.avg.com
1/12/2009 07:04
Message 5
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| Subject: | 3300A - Full Throttle Roughness |
Don
I have the J3300 in a Quickie Q-200 and getting 170KTS at 3000 ft CAS but
still not happy with the higher power settings and feel it has more
potential.
Yes you could try the boost pump and that would indicate if there is a
problem with the needle valve seat. It is possible to almost stop the engine
if it gets too rich even at WOT.
The setup is supposed to be OK at 3PSI.
Some have fitted a fuel pressure regulator but if you are sure you have 3PSI
up to WOT I don't see any value in adding another fail point.
Maybe it is the choke. The return spring is not very strong.
Peter
_____
From: owner-jabiruengine-list-server@matronics.com
[mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of Don
Honabach
Sent: Tuesday, 13 January 2009 4:55 PM
Subject: RE: JabiruEngine-List: 3300A - Full Throttle Roughness
Peter,
Thanks for the quick reply.
FYI, I have a low-wing design and during take-off I use an electric boost
pump but during transition to cruise I turn it off and just use the engine
driven mechanical fuel pump on the 3300A. Even with the boost pump, I don't
exceed 3PSI (at least as much as I can trust the accuracy of the gauge at
such low values and a narrow range).
Assuming the needle leaking is the issue, is there a fix for non-gravity
feed setups?
As a side question, do those with gravity setups remove the engine driven
pump?
I'm assuming that if I turn on the boost pump during cruise and if I have a
needle leak issue that the problem should be noticeable sooner or should be
worse as the increased pressure will cause more leakage?
I'll check the choke cable as well to make sure it is fully closing.
Thanks!
Don
From: owner-jabiruengine-list-server@matronics.com
[mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of Peter
Harris
Sent: Monday, January 12, 2009 23:21
Subject: RE: JabiruEngine-List: 3300A - Full Throttle Roughness
It sounds like it may be too rich under the load conditions at WOT cruise.
The fuel bowl is fitted with 2.25mm needle valve seat which is meant for
gravity feed, but they have selected the power needle as a compromise. If
you are using a fuel pump it may cause the needle valve seat to leak and
overfill the fuel bowl causing excessive rich mixture near max rpm.
Another cause of over rich mixture is due to the starting choke not fully
closing due to friction in the cable.
Peter
_____
From: owner-jabiruengine-list-server@matronics.com
[mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of Don
Honabach
Sent: Tuesday, 13 January 2009 4:03 PM
Subject: JabiruEngine-List: 3300A - Full Throttle Roughness
I'm having an issue where during cruise flight if I go full throttle either
in straight and level or climb, the engine gets rough enough that it feels
like it will quit. At this point, I obviously don't want to push the issue
so I pull back on the throttle until the roughness goes away.
Interestingly, I have no problem with full throttle roughness on
take-off/climb-out.
I also did some additional testing today and found that if I ease real slow
into full throttle from cruise that I still get the roughness but not as bad
and that the RPM will increase up to ~2,9xx and then start to degrade as I
continue to add power along with additional roughness.
Background info:
Full Throttle Static RPM/Ground Run Up is ~2,800RPM. No issues with
roughness.
On my 601HDS, I have a 3300A with the Sensenich Carbon Prop (64"?
2A0J5R64Z-N) that was purchased from Jabiru USA/Pete K. back in 2006.
Any help greatly appreciated. I've sent this same question to Jabiru USA and
haven't gotten a response yet (sent last Thursday and sent another today
asking for status).
Initially thought it was the SCAT intake hose which I replaced with the
rubber 90 degree elbow. Same issue with either intake method.
Thanks!
Don Honabach
Tempe, AZ
http://www.matronics.com/Navigator?JabiruEngine-List
http://forums.matronics.com
http://www.matronics.com/contribution
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