Bud=2C
I am just a little bit confused. Should I order a type J thermocouple from
Sandy ? And the VDO ? It is a German make rated at 150C with the appropriat
e thread=2C I think 10mm.
My original notes have pin 4 white and pin 17 red for cht no. 1. I had an
early EIS=2C so maybe Grand Rapids made some wiring changes since then.
For coolant I have white/brown on pin 24.
Karl
From: budyerly@msn.com
Subject: Re: Europa-List: EIS problem identified
Date: Sat=2C 31 Jul 2010 18:29:56 -0400
Karl=2C
I have gone through 4 EIS CHT probes in 5 different aircraft. They are a b
it flimsy in my opinion. That unwanted opinion forwarded=2C I have always
found it wise to replace the CHT ring. Write to Sandy at Grand Rapids and
they may even send you one at a significant discount. The VDO probe sensor
(single wire) is Rotax proprietary (because of the thread) and is swapped
with any of the other VDO probes for testing. The two wire probes (the CHT
ring that is held in place by the VDO sensor tight against the head) I bel
ieve is a type J thermocouple. As the ring heats=2C the resistance in the
probe changes (magic) and is read by the magic box. If the ring shorts=2C
it sends improper voltage back to the EIS and the box is very unhappy.
I am confused at your pin 4 comment=2C as as that is Red CHT #5 from the th
ermocouple. #19 on the other plug is your water temp sensor wire.
It is amazing what one bad voltage input will do to our magic black boxes.
Hope I am not confusing you.
Bud
----- Original Message -----
From: Karl Heindl
Sent: Saturday=2C July 31=2C 2010 5:47 PM
Subject: Europa-List: EIS problem identified
Ian=2C Gary=2C Bud=2C
Ian was right about the sensors. I used the only consistently wrong value o
f 10.0 volt with the engine not runnunig as a refernce to work with.
I pulled my 24 pin connector apart=2C which disconnects all probes=2C and t
he volt display was good at 12.5. So now I just had to identify which wire
was the culprit.
I used one jumper and connected one wire at a time=2C until I came to the C
HT=2C which is pin4 on the EIS side. To be 100% sure I cut the wire=2C reco
nnected the plug and ran the engine. Everything looks good except for the c
ht of course.
One more question: Is the faulty part most likely the VDO probe or the two-
stranded wire ? The two wires are crimped onto a ring-connector=2C and are
hence shorted. I don't really understand theprinciple=2C but are the two wi
res necessary ? Where can I get a VDO probe quickly ? motorcycle or car par
ts shop ?
The mind boggles at the software in this EIS unit. It scrambled all importa
nt parameters. My battery move was purely coincidental.
I think our lives would be a lot more complicated if it wasn't for this for
um.
Thanks again for all your help.
Karl
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