Today's Message Index:
----------------------
1. 03:37 AM - Re: Re: Carb Heat with 912ULS (Duncan & Ami McFadyean)
2. 03:49 AM - Re: Throttle Cables sticking (Duncan & Ami McFadyean)
3. 05:16 PM - Re: Re: Carb Heat with 912ULS (Evan Gardiner)
4. 09:31 PM - Replace Needle? (Guy Buchanan)
5. 11:51 PM - Re: Re: Carb Heat with 912ULS (Robert C Harrison)
Message 1
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| Subject: | Re: Carb Heat with 912ULS |
With some makes of digital thermometer it is possible to buy additional
probes.
I have these (3 in total) wired through a selector switch. Problem then is
that the switch has its own resistance and reduces the reading by (in my
case) 6 deg; but at least this reduction is consistent.
I don't generally see carb body temps less than 20C (Europa Classic, cold
air supply to carbs., no formal carb heat), unless OAT is well below
freezing, whilst under-cowl temps in the proximity of the carbs are about
10C greater than this.
Elsewhere (Skydrive?) it has been mentioned that a carb body temp of
anything less than 2C is cause for worry; so not sure who is right on the
issue of limiting temperatures, and not willing to find out!
Duncan McF.
----- Original Message -----
From: "Gtblu" <gtbjbell@gmail.com>
Sent: Thursday, January 31, 2008 2:26 AM
Subject: RotaxEngines-List: Re: Carb Heat with 912ULS
>
> Good one. I've got some in the hangar. Did you put another probe onto the
> thermometer or did it already have two "externals". I f so what breed are
> they.. I have only seen indoor/outdoor with one internal probe and one
> extended external.
>
> --------
> Slepcev Storch
> 912 uls 731 hours
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=161465#161465
>
>
>
Message 2
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| Subject: | Re: Throttle Cables sticking |
I did something similar, but had the two Bowden cables connected directly to
the vernier via a slider arrangement.
This worked OK with two fuel injection throttle bodies, which are extremely
difficult to balance accurately (far more difficult than carbs, even without
a balance tube).
For the ROtax, I have teflon lined stainless Bowden cable which works OK,
and at reduced tension on carb springs. Has to be stainless with teflon, for
best effect. And same length of cable for each carb, irrespective of actual
requirement.
For nylon/acetyl lined cables, the possibility of the liner softening and
welding the throttle open on a long cruise (if the cable is routed near to
under-cowl hotspots such as exhausts) needs to be considered.
Duncan McF.
----- Original Message -----
From: "Steve Hagar" <hagargs@earthlink.net>
Sent: Thursday, January 31, 2008 1:59 AM
Subject: RE: RotaxEngines-List: Throttle Cables sticking
> <hagargs@earthlink.net>
>
> I have installed a Cessna Push pull vernier type throttle single cable up
> into the engine compartment. Once there, it is split into two where the
> normal motorcycle type cable that comes with the plane is used. Each
> length of these is 18 inches or less long and is easily overcome by the
> carberator springs.
>
> Steve Hagar
> A143
> Mesa, AZ
>
>
>> [Original Message]
>> From: Rich & Sandy Schultz <TheSchultzFamily@comcast.net>
>> To: <rotaxengines-list@matronics.com>
>> Date: 1/28/2008 10:49:46 PM
>> Subject: RotaxEngines-List: Throttle Cables sticking
>>
> <TheSchultzFamily@comcast.net>
>>
>>
>> I am looking to see what others have done to prevent throttle cable
>> bowing
>> of the twisted wire used in most throttle cables. I have a 914 installed
> on
>> a Europa and am having problems with one of the cables wanting to bow in
> the
>> throttle box and not allowing me to get full power. The throttle springs
> are
>> not strong enough to pull the cable and keep it in tension all the time.
> On
>> the Europa form others have talked about going to a solid cable .055 or
> .078
>> SS piano wire. I have some concerns about the carburetor attachment point
>> producing a stress crack and failing under the vibration. I am interested
> to
>> hear what others have done?
>>
>>
>>
>>
>
>
>
Message 3
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| Subject: | Re: Carb Heat with 912ULS |
Your point is very valid, it is not so important what the actual normal
tempereture reading of your carb body is - what the temp guage gives you is
the ability to recognise that the carb body has, over a short period of
time, cooled by 4-6 degrees. Under these circumstances the only thing that
could have caused the carb body to cool that much, that quickly, must be
that a build up of ice has formed on the carb throat. Time to deal to the
problem!
Evan Gardiner
MCR 01 ULC
> <ami@mcfadyean.freeserve.co.uk>
>
> With some makes of digital thermometer it is possible to buy additional
> probes.
> I have these (3 in total) wired through a selector switch. Problem then is
> that the switch has its own resistance and reduces the reading by (in my
> case) 6 deg; but at least this reduction is consistent.
>
> I don't generally see carb body temps less than 20C (Europa Classic, cold
> air supply to carbs., no formal carb heat), unless OAT is well below
> freezing, whilst under-cowl temps in the proximity of the carbs are about
> 10C greater than this.
>
> Elsewhere (Skydrive?) it has been mentioned that a carb body temp of
> anything less than 2C is cause for worry; so not sure who is right on the
> issue of limiting temperatures, and not willing to find out!
>
> Duncan McF.
--
Message 4
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All 582 drivers, past and present,
I'm doing my 150 hour check and the book says I should
change the needles and needle jets. Should I? Or does this date back
to the days before the needle O-rings? Do these wear out from
vibration? Anything else I should change out at 150 hours?
Thanks,
Guy Buchanan
San Diego, CA
K-IV 1200 / 582-C / Warp / 100% done, thanks mostly to Bob Ducar.
Message 5
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| Subject: | Re: Carb Heat with 912ULS |
Hi! All
I have been passed a Rotax CD which seems to recommend some form of carb
heat when a 914 is fitted with an intercooler (yes, you've guessed it I
have such a combination!) Whilst I do appreciate that the presence of
moisture and ambient humidity provide a huge range of Carb icing
probabilities I had understood that on a straight turbo combination the
final intake temps are in the 40deg to 60 deg. Fitting the intercooler
does drop the intake temps to approx 16 deg at 10,000ft with ground
ambient 4 deg (all celcius)and the inside of the screen freezing over!
With the air filter directly turbo intake mounted it will be a humongous
task to re-route hot air to the system.
ST Aviation have a metal carb heat electric element (obviously two
needed on the Rotax which "pull" 10 amps when switched on )has anyone
tried these guismos on a Rotax? Alternatively does anyone have
suggestions concerning collection of engine compartment air to provide
carb heat in an icing emergency?
Regards (here we go again!)
Bob Harrison G-PTAG
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Evan
Gardiner
Sent: 01 February 2008 01:12
Subject: Re: RotaxEngines-List: Re: Carb Heat with 912ULS
<chunk@xtra.co.nz>
Your point is very valid, it is not so important what the actual normal
tempereture reading of your carb body is - what the temp guage gives you
is
the ability to recognise that the carb body has, over a short period of
time, cooled by 4-6 degrees. Under these circumstances the only thing
that
could have caused the carb body to cool that much, that quickly, must be
that a build up of ice has formed on the carb throat. Time to deal to
the
problem!
Evan Gardiner
MCR 01 ULC
> <ami@mcfadyean.freeserve.co.uk>
>
> With some makes of digital thermometer it is possible to buy
additional
> probes.
> I have these (3 in total) wired through a selector switch. Problem
then is
> that the switch has its own resistance and reduces the reading by (in
my
> case) 6 deg; but at least this reduction is consistent.
>
> I don't generally see carb body temps less than 20C (Europa Classic,
cold
> air supply to carbs., no formal carb heat), unless OAT is well below
> freezing, whilst under-cowl temps in the proximity of the carbs are
about
> 10C greater than this.
>
> Elsewhere (Skydrive?) it has been mentioned that a carb body temp of
> anything less than 2C is cause for worry; so not sure who is right on
the
> issue of limiting temperatures, and not willing to find out!
>
> Duncan McF.
--
--
27/01/2008 18:39
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