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:
>
> 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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