EGT guage

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Garry

Garry

10 Year 15 Year
Joined
Oct 10, 2006
Threads
13
Messages
233
Location
Timaru, South Canterbury, New Zealand
Hey guys, I've been reading on some your threads about running a pyro guage to monitor head temps etc, and since I am going to be doing a bit of towing this summer, I thought it would be a good idea to have one.
I picked up a used guage and probe (I think it came from a light plane) but it didn't come with wiring instructions:doh: Am I right in assuming that the guage runs completely independent from the vehicle electric system? It only has two wires from the probe (yellow & red) and two terminals in the back of the guage.:confused:
Any ideas?
 
usually you have the probs 2 wires and a light wires and a power source, 5 wires in all. take a pic and post it up, this will help us to figure out the wiring with you...
cheers
 
i think most automotive pyrometers will have 5 leads, 2 to the pyrometer, a ground, 1 from igniton power, and one to head lights to light it up at night. if it were to only have 2 it could be running in series with the gauge and would not have a light. the probe acts like a variable resistor changing how much current will go through it based on temp, and the gauge acts as a amp- meter telling how much current runs through it. best thing to do is ask the previous owner or try and find some info from manufacturer. no need to break your new toy before you get to play with it.
 
Today I connected the two wires from the probe to the terminals on the back of the guage (yellow wire to the post marked "Y" and the red wire to the post marked "R" :doh::grinpimp:) I then cranked up my old kerosine blow torch and aimed the flame at the end of the probe. Instantly the needle shot up to 1600 deg F!:idea:
So I think I might have answered my own question;)
 
All the reading that I've done seem to point out that the thermocouple, wiring harness, and gauge are calibrated together in order to provide an accurate reading. This is why I chose ISSPRO's EV Pyrometer with the quick connect, because there's no screws and sleeves to fiddle around with to connect the thermocouple.

If there's something not right with the wires or connections, you won't get an accurate reading.
 
so you just connected the probe in series with the gauge, hooked up one end of the prometer to positive an the other lead off the gauge to negative?

No Cody, I didn't connect to any power source at all!! It works under its own power:D
Yesterday I drilled a hole in the exhaust pipe about 1.5" below the manifold flange and installed the probe. I then ran the lead up under the dash and mounted the guage to the right of the instrument clustre (between the speedo and the pillar) Seems to work just fine, not bad for $40.;) Ive been driving it today and so far the guage seems to work well. Dosen't move much at low speeds but when I pushed it up hill the guage popped up to around 1100 deg F.
What temp range EGT should a non turbo 2H run?
 
Last edited:
Garry said:
so you just connected the probe in series with the gauge, hooked up one end of the prometer to positive an the other lead off the gauge to negative?

No Cody, I didn't connect to any power source at all!! It works under its own power:D
Yesterday I drilled a hole in the exhaust pipe about 1.5" below the manifold flange and installed the probe. I then ran the lead up under the dash and mounted the guage to the right of the instrument clustre (between the speedo and the pillar) Seems to work just fine.;) Ive been driving it today and so far the guage seems to work well. Dosen't move much at low speeds but when I pushed it up hill the guage popped up to around 1100 deg F.
What temp range EGT should a non turbo 2H run?
Click to expand...


LOL. :cool: Well done, bit of Kiwi know how,:D cheers. Dam great game of league the other night your boys were great. :beer: :beer:
 
cody c said:
ive never heard of a self powered gauge like this before. what brand did you say it was? thats pretty cool.
Click to expand...

It's just a mechanical pyrometer with no amplifier circuit like most of the ones that you've seen. The only electrical that these mechanical gauges need is to light up the bulb for the gauge.
 
Here are some pictures of the guage and probe unit installed.
Nov28555.webp
Nov28556.webp
Nov28557.webp
 
Ok, I took the cruiser for a 2 hour drive today.
Into a headwind the guage was reading approx 1150-1250 deg F at 110kph, but coming home again (tailwind) it only ran about 800 deg F at most. This got me thinking.
Because the probe is in the exhaust pipe below the flange, then the temperature will be being influenced by all 6 cylinders and therefore will be reading alot higher than it would if I was running a set of extractors and the probe was only being heated by one cylinder.
Reading other threads, the general max temp is 1200 deg F for a diesel, so am I getting a correct reading?
I do intend to add a set of extractors and a bigger bore exhaust to my rig when funds allow. It might be interesting to see what differences there are in EGTs when this is done. Any thoughts?:cheers:
 
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