Today's Message Index:
----------------------
1. 04:49 AM - Re: Re: egt probe, wrong location how bad (Dave G)
2. 05:17 AM - Re: 914 hot starts (dashwood)
3. 08:13 AM - Re: Re: egt probe, wrong location how bad (Dave G)
4. 09:28 AM - Re: Re: egt probe, wrong location how bad (Bob Comperini)
5. 09:43 AM - Re: Re: egt probe, wrong location how bad (Jay Hyde)
6. 12:14 PM - Re: Re: 914 hot starts (Mike Parkin)
7. 01:48 PM - Re: egt probe, wrong location how bad (Roger Lee)
8. 02:12 PM - Re: Re: egt probe, wrong location how bad (Dave G)
Message 1
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| Subject: | Re: egt probe, wrong location how bad |
There's this one. If it's off it won't be by much.
http://www.ultralightnews.ca/exhaustsystems/egt_probelocation.htm
----- Original Message -----
From: "carlisle" <carlisle_99@yahoo.com>
Sent: Thursday, August 06, 2009 1:21 AM
Subject: RotaxEngines-List: Re: egt probe, wrong location how bad
> <carlisle_99@yahoo.com>
>
> Actually, the reverse is true. A probe that's closer to the piston skirt
> will read lower. I believe the analogy is something like a welder's flame
> where the hottest part is at the tip of the embedded blue flame further
> from the tip of the torch.
>
> I've got this same problem on my 582 and would like to make sure my egt
> probes are exactly the right distance out on the manifold. There are all
> kinds of complex methods for determining this for those of us who don't
> have the pre-drilled manifolds. Instead, the easiest thing would be if
> someone with one of the factory drilled parts would just measure the
> distance from the edge of the exhaust flange where it mates to the
> manifold with the engine upright (spark plugs up) and publish it here.
>
> Anyone?
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=256295#256295
>
>
>
Message 2
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| Subject: | Re: 914 hot starts |
i can never start hot if i pulse or run the electric fuel pump before i try a turnover.
the engine will flood and not start. cold starts i check run the pump
first. turn off and start engine. i only run electric pump for low level and
take off and approaches , in flight am only running on engine fuel pump .
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=256313#256313
Message 3
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| Subject: | Re: egt probe, wrong location how bad |
I'm resisting the tempation to buy a new manifold and start over. In the
cleanup prior to begging a welding shop to close up the holes I noticed that
there actually were holes in approx the right place that have been welded
over in order to put the holes in the wrong place. Here is where the guy put
them, little too close.
Message 4
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| Subject: | Re: egt probe, wrong location how bad |
On 08:02 AM 8/6/2009, Dave G wrote:
>Here is where the guy put them, little too close.
WAYY too close. As I recall, the Westach probes were supposed to be something like
2 1/8 inches away. I can't remember the exact distance, but for some reason
2 1/8 sticks in my mind. It was clearly closer to the mid point between the
"Y" and the piston end of the manifold.
--
Bob Comperini
e-mail: bob@fly-ul.com
WWW: http://www.fly-ul.com
Message 5
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| Subject: | Re: egt probe, wrong location how bad |
To me it doesn't matter particularly where the holes are- these do look a
bit close though! Nonetheless, the important thing is to establish a trend.
Your actual temperatures may be off but the important thing is to note what
they are for YOUR engine- they seem to differ from installation to
installation in any case. If you know what they are normally in different
attitudes and speeds then you will be using those temps properly. When they
start to change then you know that something is wrong.
I had an engine failure 30 hours into a brand new engine (a manufacturing
fault) and I saw it coming because I was watching my temperatures. The
water temperature was looking higher than usual, but I thought that was
because I had moved my ballistic parachute. Then I noticed that the EGTs
were getting a bit higher than normal, and then their readings started
drifting apart- one cylinder getting hotter than the other. When this
started I was 6 feet high over a marsh. As soon as I saw the temps changing
I climbed and headed back towards my airfield. Just as I got near to the
field, on a sort of base leg, the engine died. Luckily I had height so it
was a simple dead stick landing.
An alternative my be to drill another set of holes, weld the threaded
inserts into both hole sets and then screw cap screws into the too close
ones and wire them shut.
Jay
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Dave G
Sent: 06 August 2009 05:02 PM
Subject: Re: RotaxEngines-List: Re: egt probe, wrong location how bad
I'm resisting the tempation to buy a new manifold and start over. In the
cleanup prior to begging a welding shop to close up the holes I noticed that
there actually were holes in approx the right place that have been welded
over in order to put the holes in the wrong place. Here is where the guy put
them, little too close.
Message 6
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| Subject: | Re: 914 hot starts |
Despite the subject, I take it you are not using a 914 - last time I looked
my 914 didn't have a mechanical pump.
Regards,
Mike
Do not archive
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of dashwood
Sent: 06 August 2009 13:17
Subject: RotaxEngines-List: Re: 914 hot starts
<dashwoodlock@hotmail.com>
i can never start hot if i pulse or run the electric fuel pump before i try
a turnover. the engine will flood and not start. cold starts i check run the
pump first. turn off and start engine. i only run electric pump for low
level and take off and approaches , in flight am only running on engine fuel
pump .
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=256313#256313
Checked by AVG - www.avg.com
18:23:00
Message 7
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| Subject: | Re: egt probe, wrong location how bad |
The correct placement is 100mm or 4 in. from the rear of the piston. You can just
plug your old holes up. Too close or too far will give an
in-accurate reading and although you will see a trend you won't really know what
the engine is doing. The better readings you have the better you can run and
tune the engine and know when things are not right before it is too late.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=256404#256404
Message 8
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| Subject: | Re: egt probe, wrong location how bad |
Holes are plugged and redrilled in the proper location, ~100mm and the
manifold is painted andback in place. I do wonder what reason the old owner
had for changing the location. Never know I guess.
----- Original Message -----
From: "Roger Lee" <ssadiver1@yahoo.com>
Sent: Thursday, August 06, 2009 5:48 PM
Subject: RotaxEngines-List: Re: egt probe, wrong location how bad
>
> The correct placement is 100mm or 4 in. from the rear of the piston. You
> can just plug your old holes up. Too close or too far will give an
> in-accurate reading and although you will see a trend you won't really
> know what the engine is doing. The better readings you have the better you
> can run and tune the engine and know when things are not right before it
> is too late.
>
> --------
> Roger Lee
> Tucson, Az.
> Light Sport Repairman - Maintenance Rated
> Rotax Service Center
> 520-574-1080
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=256404#256404
>
>
>
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