EGT lead length and gauge accuracy???

[TomC]

You CANNOT make your own extension cord for the thermocouple for the Pyrometer out of 20 gauge wire.  The resistance will not be correct-hence your entirely too low temperature reading coming out of your engine.  400 degrees would be a good place to shut down the engine after cooling off.  The temp should read 600-900 degrees going down the road.  Get with ISSPRO and order the proper 50ft wire for the Pyrometer and you'll see the difference in reading.  Good Luck, TomC

[Reddog]

Tom,
  Thanks for the input. For what it's worth, I did order and use thermocouple specific wire. Not to say it is the correct gauge for my application, but it is the correct red/yellow thermocouple specific wire. D@8K'

[Reddog]

This stuff:
http://www.omega.com/ppt/pptsc.asp?ref=XC_K_TC_WIRE&Nav=temh06

[Reddog]

Tom,
  You are 100% correct. While I thought I was ordering the right thing, Isspro says (like you said) "wrong wire, too much resistance, low readings". I ordered the setup from Isspro and it's on it's way. Thanks, D@8K'

[Bob Belter]

Ahoy, RedDog,

Where is your probe 'plugged in'? 

Into the manifold before the turbo, or below the turbo.  The turbo takes 'work' out of the exhaust gas --  just think of it as heat.  Probably as much as a couple hundred deg F difference in reading.

Sounds too low  --  bigger wires like you have coming should do.

Enjoy   /s/   bob 

[TomC]

The best place to install a pyrometer bulb is before the turbo to get actual temp readings.  But the standard of the industry is to install it right after the turbo so if the bulb breaks off you don't loose the turbo also.
On large Diesels, they'll have an individual pyrometer per cylinder, pyrometer before and after the turbo and even a tachometer on the turbo to make sure the turbo doesn't over speed.  Good Luck, TomC