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
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Subject: | Re: Carb Balancing |
What input data at 3500rpm makes you think its a carburettor related issue?
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Subject: | Fuel tank vent overflowing during climb |
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
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Subject: | Re: 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
>
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Subject: | Re: Carb Balancing |
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
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http://forums.matronics.com/viewtopic.php?p=503154#503154
Attachments:
http://forums.matronics.com//files/rotax_engine_troubleshooting_yerly_april_2021_105.pdf
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Subject: | Re: Carb Balancing |
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
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Subject: | Re: Carb Balancing |
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
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Subject: | Re: Fuel tank vent overflowing during climb |
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
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Subject: | Re: Fuel tank vent overflowing during climb |
Thanks Jim
Do not archive
--------
Europa mono Nr 192
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Subject: | Re: 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 <davidjoyce@doctors.org.uk> 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://forums.matronics.com/viewtopic.php?p=503143#503143>http://www.m
atronics.com/Navigator
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Subject: | Re: Carb Balancing |
Or Viton.
> On 15 September 2021 at 13:57 William Daniell <wdaniell.longport@gmail.co
m> 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 <davidjoyce@doctors.org.uk mailto:dav
idjoyce@doctors.org.uk > 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" <james@kingdom.ie mailto:james@kingdom.ie >
> > >
> > > 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
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m" target="_blank" rel="noopener noreferf="http://wiki.matronics.com"
target="_blank" rel="noopener noreferre==========
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> > >
> > >
> > >
> > > http://www.matronics.com/Navigator?Europa-List
> > >
> > > > >
> > >
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Subject: | Re: Carb Balancing |
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
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