Thermocouple Questions

[lcaad1249]

After pulling my secondary turbo to get the HTT wastegate fixed, I noticed a few things. 1st, my front 3 cylinders always run hotter under a load. Could this be due to the probe being further up into the exhaust flow (about 2 inches instead of a half an inch on my TST probe)? 2nd, my thermocouple is bent towards the turbo, could this be to too extreme of heat? This thermocouple was only installed a month ago. Any ideas?

 

[triton]

location of the probe can play a part in what the gauge reads.

They other one being bent isn't good at all. If you did do it, it's likely started to bend itself from the heat.

You need to be sure you use a 2000F thermocoupler to avoid that. The last thing you need is for one to melt or break off and go through the turbo.

ISSPRO sells a nice 2K probe

 

[BigBadDodge]

Isspro P/N:R658-HT,
high temp leadwire 10’ P/N ^660-10

BBD

 

[Diesel Freak]

1/8" "K" Type TC clad in 316 stainless has served me well for a very long time

 

[lcaad1249]

I just spoke with SPA and it is a 2000 degree thermocouple that is used.

Where is the most accurate location for temp readings?

 

[mondtster]

1/8" "K" Type TC clad in 316 stainless has served me well for a very long time

x2, you pay a premium if you buy one from an automotive gauge company.

 

[Diesel Freak]

SPA uses a "K" type TC...nothing new or special

 

[mondtster]

SPA uses a "K" type TC...nothing new or special

Autometer does too. Actually, every pyro I've seen just uses a "K" type TC. There may be some odd ones out there, but the ones I've seen are all the same. The automotive TCs usually just come with some fancy mounting hardware, but that doesn't even come close to making up for the price difference.

 

[lcaad1249]

Here is a pic of the thermocouples: