Pyrometer install questions

[Scotty4]

I want to add a pyro to my truck. And my y-pipe is out right now. What is every one using as a bung to weld to the y-pipe?

The autometer gauge comes with a few mounting options including the threadolet (threaded bung). I would just find the one you want and check whats included. Summit racing sells bungs uf you get a gauge without.

 

[IDIBRONCO]

@IDIBRONCO how accurate is it when the probe is pre turbo?

What I've seen on here is it reads about 100* lower than it does 6"-8" from the head.

 

[Va_Mike]

The autometer gauge comes with a few mounting options including the threadolet (threaded bung). I would just find the one you want and check whats included. Summit racing sells bungs uf you get a gauge without.

I did a little research after I posted the question and found a couple pyrometers that have the weld in bung option.

My question now is people recommend installing the probe between the last two cylinders on the manifold I guess for ease of access. What kind of temperature difference will i see from that location versus installing the probe 3" lower than the flange on the y-pipe. I cant imagine 6-8" makes that much of a difference.

 

[IDIBRONCO]

I cant imagine 6-8" makes that much of a difference.

From what I've seen, the recommendation is 6"-8" from the head. So that's right in the ball park.

 

[The_Josh_Bear]

I did a little research after I posted the question and found a couple pyrometers that have the weld in bung option.

My question now is people recommend installing the probe between the last two cylinders on the manifold I guess for ease of access. What kind of temperature difference will i see from that location versus installing the probe 3" lower than the flange on the y-pipe. I cant imagine 6-8" makes that much of a difference.

I doubt you'd see a discernable difference between the two.
FWIW I did the top of my driver's manifold between the last two cyls. Had worked good for about 10 years. I had to replace the K-type thermocouple once, a cheap Amazon replacement worked great. That was before my turbo, and if I did it again I would do the bung in the y pipe, since shavings in the turbo and I can weld(sorta!).

 

[Scotty4]

I'm sure a company, maybe Mr. Banks, has some numbers of it. @Thewespaul done a test before? Could use a heat gun and measure exterior temp then find the equation for interior vs exterior temp. I bet it can't be but more than a few degrees difference, 30 tops.

 

[Scotty4]

I doubt you'd see a discernable difference between the two.
FWIW I did the top of my driver's manifold between the last two cyls. Had worked good for about 10 years. I had to replace the K-type thermocouple once, a cheap Amazon replacement worked great. That was before my turbo, and if I did it again I would do the bung in the y pipe, since shavings in the turbo and I can weld(sorta!).

Just found in the LeBlanc thread Wes states he saw no difference with the probe on the header or Y pipe.

 

[IDIBRONCO]

Like he told me, "it's still within 8" of the head".