Today's Message Index:
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0. 12:10 AM - Some Nice Comments... (Matt Dralle)
1. 04:28 AM - Re: A spectacle in Uk Norflok (Troy Maynor)
2. 04:55 AM - Re: GRT EIS Rotax probes for CLASSIC installation (Troy Maynor)
3. 05:16 AM - SV: Re: GRT EIS Rotax probes for CLASSIC installation (Sidsel & Svein Johnsen)
4. 12:58 PM - Re: GRT EIS Rotax probes for CLASSIC installation (Bud Yerly)
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Subject: | Some Nice Comments... |
Dear Listers,
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Message 1
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Subject: | Re: A spectacle in Uk Norflok |
Hi Graeme,
Very nice picture. I love pix of places that I've never been but would like to.
Ah...wonderlust.
Troy
do not archive
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=388507#388507
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Subject: | Re: GRT EIS Rotax probes for CLASSIC installation |
Hi Chris,
I will reply as I have a classic install but admit I won't be much help. I used
an engine monitor that went out of business, called Audio Flight Avionics. It
came with two threaded (5mm?) CHT probes that screwed into two holes already
tapped on the front left and right rear cylinders. I am 40 miles from my hanger
so I can't go out and look or take any measurements very soon. The 3/8" ring
terminal you mention is meant to go under on of the spark plugs on the same cyclinder
most likely. Don't understand the 1/8" one though. I'd call Grand Rapids
for guidance unless someone here knows.
I remember having to move the EGT probes slightly away from the heads very slightly,(again
can't measure today) in order to get away from the thick area of the
exhaust pipe. With that, coincidentally, I was about to broach the subject
of EGT here in a few days when I have gathered some data on my plane. It seems
two of my cylinders are hotter than they should be, but thats off the point for
now. Hope you can get the answers you want.
Troy Maynor
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=388509#388509
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Subject: | Re: GRT EIS Rotax probes for CLASSIC installation |
Troy and Chris,
> The 3/8" ring terminal you mention is meant to go under on of the spark
> plugs on the same cyclinder most likely.
I heard this when I was about to do my installation, but as I recall there
is no space for a ring terminal in the spark plug recess in the cylinder
head.
My memory may be failing, though .........
Regards,
Svein
Message 4
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Subject: | Re: GRT EIS Rotax probes for CLASSIC installation |
Chris,
Please check the grtavionics.com website for installation notes and the
updated manual . I've attached Rev K. We are a sales point for GRT and
install them frequently.
EGT s normally are two inches from the outlet of the head, but that is
in the crux of the bend.
2.75 is not that bad. Anything beyond that like out to a max of 8
inches decreases accuracy but is still great for trends. Normally only
the two rear cylinders are needed on a 912/914 engine. Place the EGT
probes on a fairly straight section and drill the hole so as to keep the
probe from rubbing on anything. Pay attention to the foot well and oil
tank and plan accordingly.
GRT avionics has the larger CHT ring terminals which go on the Rotax CHT
probes. You unscrew the probes and put the CHT supplied rings on there
and they are an exact fit. I believe for the Rotax it is a 12mm..
There is an option for those who desire a bolt on probe to the cylinder
fins. This is normally not provided and I am surprised you received
one...
Regards,
Bud Yerly
Custom Flight Creations.
----- Original Message -----
From: Christoph Both<mailto:christoph.both@acadiau.ca>
To: europa-list@matronics.com<mailto:europa-list@matronics.com>
Sent: Tuesday, November 20, 2012 9:03 AM
Subject: Europa-List: GRT EIS Rotax probes for CLASSIC installation
Hello Europa builders:
I am about to drill holes into the stainless steel CLASSIC exhaust
headers to mount the EGT probes. Rotax912S manual says to locate the EGT
probes 70mm or 2.75 inches from the exhaust port. Both back exhaust
pointing stacks end up drilling the thicker, double side flange if I
take this measurement. Is this OK? Front exhaust measures 70mm (2.75
inch) on the not- welded part. Is this OK or have CLASSIC engine
installations chosen a different distance.
I have a GRT EIS Model 4000 for Rotax 912. It came with a number of
probes but no description of probes and where to mount them. EGT was no
issue (see above). However, there is a set of what I assume CHT probes,
one terminating at one end with a large ring terminal (3/8 inch) and one
with a very small ring terminal (1/8 inch). What are they for and where
do I mont those? Rotax installation manual specifies that 2 probes are
to be connected to the hot water location locations provided but then on
one page describe tapping a M-5 (5mm) thread to "install" a probe
measuring the CHT directly at the cylinder cooling fins as described.
I would appreciate some quick clarification for those who have
installed this combination. Pictures appreciated.
Thanks very much.
Christoph Both
#223 CLASSIC Wolfville, Nova Scotia, Canada
www.aeroelectric.com<http://www.aeroelectric.com/>
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