Pyrometer install Question.
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Freshman User
Joined: Oct 2005
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Pyrometer install Question.
At some point in the future, I intend to install a pyrometer. However, at this time I have spent all I can just getting the parts and having the heads redone, and so I must wait.
I am trying to plan ahead, since i have the manifolds off already, I had thought to drill & tap a hole for the pyrometer probe at this time rather than having to remove the manifold a second time. Of course I will run a plug into the hole after ti is tapped, I was just wondering if anyone knew what the size & pitch of the thermocouple is on an ISSPRO pyrometer. Thanks in advance.
I am trying to plan ahead, since i have the manifolds off already, I had thought to drill & tap a hole for the pyrometer probe at this time rather than having to remove the manifold a second time. Of course I will run a plug into the hole after ti is tapped, I was just wondering if anyone knew what the size & pitch of the thermocouple is on an ISSPRO pyrometer. Thanks in advance.
Senior User
Joined: Nov 2004
Posts: 315
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On the drivers side exhaust manifold, in line with the exhaust port on top of the manifold. Thier are 2 thoughts on the location if you run a turbo, one is the exhaust manifold - if the tip of the thermocouple ever breaks it will end up in the turbo, but gives you a real direct reading. The other is after the turbo on the down pipe - this gives you a cooler reading so you add 200/300 degrees or get a pyro that is for the down pipe. If I remember 1/4 NPT is the tread size, check the guage manuf. web site.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
I have personally driven pyrometer equiped trucks for several million miles. Never have I had a tip break off, may happen tomorrow though.
1/4" NPT is the correct size.
Drivers side manifold at the cross over pipe connection is where mine is.
After the turbo the numbers are correct plus or minus a couple of hunderd degrees.
A couple of hundred degrees is also the difference in no engine damage and engine damage.
Why guess it is OK after spending money on a pyrometer?
1/4" NPT is the correct size.
Drivers side manifold at the cross over pipe connection is where mine is.
After the turbo the numbers are correct plus or minus a couple of hunderd degrees.
A couple of hundred degrees is also the difference in no engine damage and engine damage.
Why guess it is OK after spending money on a pyrometer?
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
The location above the connector for the cross over pipe is almost outside the # 7 exhaust port. My thermocouple was to long to go in the runner for the port since I drilled and taped the manifold.
