http://www.europaowners.org/gallery2/v/Begin-06-2003/Firewall+forward/album286/Monitoring+coolant+temperature/ en-us Gallery 2 RSS Module, version 1.1.8 Sat, 11 Apr 2026 00:17:28 +0000 120 http://www.europaowners.org/gallery2/d/78343-8/Monitoring+coolant+temperature.jpg http://www.europaowners.org/gallery2/v/Begin-06-2003/Firewall+forward/album286/Monitoring+coolant+temperature/ http://www.europaowners.org/gallery2/v/Begin-06-2003/Firewall+forward/album286/Monitoring+coolant+temperature/DSCN7196.JPG.html http://www.europaowners.org/gallery2/v/Begin-06-2003/Firewall+forward/album286/Monitoring+coolant+temperature/DSCN7196.JPG.html
My sender fits perfect inside UMAs probe housing. Note the black washer, it is coated with rubber.
Y10-06-11

Update:
Frans said he has the same sender body from UMA and he says dosen't really measure anything else other than outside temp of airbox. Too much thermal conductivity of Brass probe to airbox and too little airflow. This may be a carb air temp sender that measures a much faster airflow?
He is going to check design of how Rotax measures for TCU input of airbox .
Anyway I did a quick calculation:
At ~ 100% power airspeed in airbox ~13.9MPH and carbs 49.7MPH.
Mind you when less than full throttle carb velocity will be higher.
I used 800 gallons a minute with a 4" diameter for airbox and 400 gallons a minute and a 1.5" diameter for carb. 1 gallon = 231 cubic inches.
Y10-06-21]]> rparigoris photo Mon, 21 Jun 2010 21:20:30 +0000 http://www.europaowners.org/gallery2/v/Begin-06-2003/Firewall+forward/album286/Monitoring+coolant+temperature/DSCN7194.JPG.html http://www.europaowners.org/gallery2/v/Begin-06-2003/Firewall+forward/album286/Monitoring+coolant+temperature/DSCN7194.JPG.html ]]> rparigoris photo Fri, 11 Jun 2010 18:02:18 +0000 http://www.europaowners.org/gallery2/v/Begin-06-2003/Firewall+forward/album286/Monitoring+coolant+temperature/DSCN7193.JPG.html http://www.europaowners.org/gallery2/v/Begin-06-2003/Firewall+forward/album286/Monitoring+coolant+temperature/DSCN7193.JPG.html
The water temp probe is just there for comparison. UMA sold me one of their airbox probes without any electronic sender (left).
Y10-06-11]]> rparigoris photo Fri, 11 Jun 2010 18:01:24 +0000 http://www.europaowners.org/gallery2/v/Begin-06-2003/Firewall+forward/album286/Monitoring+coolant+temperature/DSCF0289.JPG.html http://www.europaowners.org/gallery2/v/Begin-06-2003/Firewall+forward/album286/Monitoring+coolant+temperature/DSCF0289.JPG.html ]]> rparigoris photo Fri, 09 Apr 2010 22:38:56 +0000 http://www.europaowners.org/gallery2/v/Begin-06-2003/Firewall+forward/album286/Monitoring+coolant+temperature/DSCF0290.JPG.html http://www.europaowners.org/gallery2/v/Begin-06-2003/Firewall+forward/album286/Monitoring+coolant+temperature/DSCF0290.JPG.html
Was able to lay up 3 BID from access holes on starboard side of fuse. Used a superball covered in Saran wrap. Here you see port side of fuse stabilator closeout. Will mount sender in middle of this crator.
Y10-04-09]]> rparigoris photo Fri, 09 Apr 2010 22:41:43 +0000 http://www.europaowners.org/gallery2/v/Begin-06-2003/Firewall+forward/album286/Monitoring+coolant+temperature/DSCN7077.JPG.html http://www.europaowners.org/gallery2/v/Begin-06-2003/Firewall+forward/album286/Monitoring+coolant+temperature/DSCN7077.JPG.html
Plan is to install a 6 position rotary switch so I can display 6 stations.
1) Certain, ambient temperature in a 1.5" dished depression in stabilator fairing
2) Certain airbox temperature
3) Certain under instrument module above Becker radio and transponder
4 to 6 uncertain.
ideas:
*Upper aft in cowl
*Perhaps inside cockpit
*Female connector in cowl which would give me ability to monitor anything
*Starter temp
*Ducati regulator
*Inside firewall/footwell shroud that covers TCU, wastegate servo, Ducati regulator, LR3C regulator if I go that route

As far as the ambient temperature sender per Bob 1):
*We install a small dished cup in the tailplane fairing..
*The cup is recessed into the fuselage faring not the stabilator. There are
a number of ways to make a small cup to insert into a 1 ½ inch hole with the
probe mounted to the base of the cup just enough that it does not protrude
past the edge of the fairing. Simple and effective.
*The small cup overlaps with 2 layers bid with 4 layers in the bottom where the probe attaches. A little filler to smooth it out.
Y10-02-18

After researching my options, I am going to install my OAT sender on the port stabilator fairing on the fuse. It can be accessed through starboard inspection cover to do layup. Location is a few inches forward of the stabilator torque tube/spar. I have a procedure to install that includes first drilling with a Unibit leaving the outside skin with a larger hole than the inside. Then dig foam between fuse glass and fill with flox. Then insert a sphere, in my case a superball with saran wrap streached over it and 3 BID (The stepped hold follows sphere. I will end up with a dished out recess with my sender being slightly below fairing height. My sender is a 3/16" cylinder with a flat and 3/16' long. Outside hole is .870".

I fooled with a ping pong ball, but since my sender is so small I opted for a smaller hole.
Ron P.
Y10-02-19]]> rparigoris photo Fri, 19 Feb 2010 07:52:12 +0000 http://www.europaowners.org/gallery2/v/Begin-06-2003/Firewall+forward/album286/Monitoring+coolant+temperature/DSCN7075.JPG.html http://www.europaowners.org/gallery2/v/Begin-06-2003/Firewall+forward/album286/Monitoring+coolant+temperature/DSCN7075.JPG.html ]]> rparigoris photo Sun, 23 Feb 2014 04:11:51 +0000 http://www.europaowners.org/gallery2/v/Begin-06-2003/Firewall+forward/album286/Monitoring+coolant+temperature/DSCN7074.JPG.html http://www.europaowners.org/gallery2/v/Begin-06-2003/Firewall+forward/album286/Monitoring+coolant+temperature/DSCN7074.JPG.html
Ilec SC-7 readout stops at 190°F which is good enough for what I need it for. 190°F just happens to the airbox intervention temperature on the TCU (new style) on my 914. I will mount a semiconductor temperature sender in a brass probe that I will screw into airbox.
Y10-02-18]]> rparigoris photo Thu, 18 Feb 2010 22:36:06 +0000 http://www.europaowners.org/gallery2/v/Begin-06-2003/Firewall+forward/album286/Monitoring+coolant+temperature/DSCN7073.JPG.html http://www.europaowners.org/gallery2/v/Begin-06-2003/Firewall+forward/album286/Monitoring+coolant+temperature/DSCN7073.JPG.html
I have an Ilec SC-7 Variometer that has a temperature read out. It is driven by tiny 3/16" cylinder x 3/16" long precision semiconductor thermal sender.
Here we are warming along with a thermocouple driven probe. Tracking is very very close to thermocouple driven probe. 32°F was spot on with snow cup. Sprayed some freeze spray and it went to at least -40°F. Here it is at 165°F.
Precision temperature sensor specs:
National Semiconductor
3-TO-92 package
-55 to 150C
Y10-02-18]]> rparigoris photo Tue, 23 Feb 2010 02:15:01 +0000