Paul, I just looked at the EGT probes (not yet installed) that came with my
EIS and they fit in the 914 exhaust fittings. I asked GRT about bending one
for cowling clearance and they said OK up to 90 deg. Anyone know where I
obtain an airbox temp probe, 1/8"npt, for the 914?
Sounds like maybe you need to exchange your EGT's Paul?
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com]On Behalf Of Jim Brown
Subject: Re: Europa-List: EIS Questions
Paul
Grand Rapids has an EGT probe that screws into the welded boss on the
exhaust pipe. I just recently ordered a replacement for one of mine that
went bad.
The 914 has two CHT sensors. One is installed on one of the front cylinders,
the other is installed on the other side of the engine on one of the rear
cylinders. I forget which is which. These are the sensors I used. Dealers
choice on which
way to go.
The water jacket surrounds the area where the Rotax supplied CHT sensor are
installed. On the ground while taxing if the CHT gets to about 240-250
degrees F, I know that its going to dump some water in the overflow bottle,
at this point I am
indirectly seeing coolant temp. In the air I'm seeing normal cylinder head
temp. I do not have a separate sensor to measure coolant temp. Since the
cylinder heads are water cooled I would think that a sensors installed under
a bolt head would
show about the same temperatures as the installed Rotax sensors.
The air box temp would be a good thing.
In the 914, Rotax set the TCU so that at 165 degrees F in the airbox, the
TCU will retard the timing to prevent detonation (spark knock) This is one
reason inter coolers are installed, so that the airbox temp's do not each
the threshold.
Jim Brown
N398JB
Paul McAllister wrote:
<paul.mcallister@qia.net>
>
> Hi all,
>
> I have a couple of questions regarding the engine sensors for the EIS.
>
> EHT. The Rotax has a sleeves with a nipple welded onto each exhaust pipe,
however Grand Rapids supply a probe with a hose clip. Should I use this or
is there a sensor that fits into the nipple.
>
> CHT. Rotax has a sensor on at the front of the engine, but Grand Rapids
supply two sensors that fits under the head bolts. What have people been
doing here.
>
> Coolant temperature. Rotax provide no means for measuring this. The EIS
has a coolant input but no sensor supplied. I'd be interested in knowing
what folks have done. One thought was to re use this input as an air box
temperature input.
>
> Thanks, Paul
>
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