Today's Message Index:
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1. 01:25 AM - Re: Rotax 914 Exhaust Leak (davidjoyce@doctors.org.uk)
2. 05:30 AM - Re: Rotax 914 Exhaust Leak (Remi Guerner)
3. 06:17 AM - Re: EUROPA XS GAS STRUTS (willydewey)
4. 06:52 AM - Skysports bendable capacitive probe calibration? (clivesutton)
5. 10:58 AM - Re: Skysports bendable capacitive probe calibration? (Richard Scanlan)
Message 1
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Subject: | Re: Rotax 914 Exhaust Leak |
Dave, I had a somewhat similar experience having invested in a new
electronic CO detector instead of one of those useless cardboard dots. I
found my leak was through the slots in the join where the exhaust stub
fits onto the silencer. Filling that with exhaust cement totally fixed
my problem, although naturally that is not going to help you if your
remaining problem is still with the exhaust down pipes, but worth
checking anyway.
Regards, David Joyce, GXSDJ (914 XS)
On 2017-01-25 04:13, djaflyact wrote:
>
> I have a motor glider with the 914 engine. Just bought a good CO detector and
was surprised that I have been flying for years with low level CO in the cockpit.
I did the classic shop vac blowing in the exhaust to see if I could determine
any leaks. To my huge surprise, I didn't need soapy water to find a leak.
All four slip joints are blowing air like crazy. The fit seems very loose. I
did the same test on a friend's newer 914 and there was no leak at all.
>
> Anyone have any experience with this. I loaded up the joint with anti seize compound
as a test and the leak was reduced significantly. The cockpit readings
at idle lowered from 20 to 5 on the ground. I am considering using a pipe expanding
tool to slightly increase the smaller pipe to make it a tight fit. The
metal is stainless steel and I don't know if that can be done. It won't take much
to provide the increased tightness.
>
> A big concern is the cost off the exhaust parts if I need to replace them. Rotax
is extremely proud of their parts. the 4 pipes and the gatherer total approximately
$4700. That is crazy.
>
> Any isights would be appreciated.
>
> Dave A
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=465414#465414 [1]
>
> Attachments:
>
> http://forums.matronics.com//files/screen_shot_2016_12_29_at_74111_pm_173.png [2]
>
Links:
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[3] http://www.matronics.com/Navigator?Europa-List
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Message 2
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Subject: | Re: Rotax 914 Exhaust Leak |
I think it is illusory to try to get a 100% sealed exhaust system. Metal to metal
joints are not perfect, especially when they are subjected to thermal expansion
and vibrations. They can be improved using some sort of sealant but that
will not last for long due to the huge temperatures involved. Leaks are more likely
on the 914 due to the higher back pressure caused by the turbo when it is
working at full boost with the waste gate fully closed. Leaks are also likely
on the 912 with the CKT exhaust when the springs age and become weaker.
One solution to prevent fumes to get into the cockpit is to make sure cockpit pressure
is always higher than both cowling pressure and outside pressure. To achieve
that, the cowling should be well vented with small air intakes and an exit
area big enough to suck the airflow. Fresh and/or heated air vents should
be at least partially open to create a pressure build-up inside the cockpit. I
still have to perform some CO measurements to determine if I was successful at
achieving that.
Remi Guerner
F-PGKL
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=465424#465424
Message 3
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Subject: | Re: EUROPA XS GAS STRUTS |
Hi John
thank you for your reply
I have tried Karen for the last 10 days now on the phone and left messages but
with no response until as a last resort phoned David at Swift Aircraft, that
got things sorted.
I will use SGS as prompted by your goodself
Appreciated your message
Bill Dewey G-IANI
--------
Give a wise man knowledge and he will be yet wiser
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=465426#465426
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Subject: | Skysports bendable capacitive probe calibration? |
I have fitted the above fuel level sensor into the RH lobe of my fuel tank. The
probe design is the same type sold by Airworld for many years.
The system already has a 'needle-on-scale' type readout via a VDO-type gauge -
but i would also like to connect its signal output on an AUX channel of my EIS4000
engine monitor to display actual figures in Litres
For that to work, the EIS4000 needs a 'scale factor'. Has anyone done this already
- and if so, what SF (and 'offset' value) did you use please?
If it has not been done already but you know the approximate voltage outputs from
this probe expected at 'empty' and 'full', that data would also be very useful
Looking forward to your replies
Clive Sutton, UK Kit 121
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=465428#465428
Message 5
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Subject: | Re: Skysports bendable capacitive probe calibration? |
The probes sold by Airworld would not 'talk' to my Dynon and I had to buy genuine
ones from an alternative source. Airworld ones look identical but are copies
and work in a different way and would only work with their analogue gauges.
Rich S.
CEIW
Sent from my iPad
> On 25 Jan 2017, at 14:52, clivesutton <clive.maf@googlemail.com> wrote:
>
>
> I have fitted the above fuel level sensor into the RH lobe of my fuel tank.
The probe design is the same type sold by Airworld for many years.
>
> The system already has a 'needle-on-scale' type readout via a VDO-type gauge
- but i would also like to connect its signal output on an AUX channel of my EIS4000
engine monitor to display actual figures in Litres
>
> For that to work, the EIS4000 needs a 'scale factor'. Has anyone done this already
- and if so, what SF (and 'offset' value) did you use please?
>
> If it has not been done already but you know the approximate voltage outputs
from this probe expected at 'empty' and 'full', that data would also be very useful
>
> Looking forward to your replies
>
>
> Clive Sutton, UK Kit 121
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=465428#465428
>
>
>
>
>
>
>
>
>
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