External thermocouple placement for pyrometer
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Senior User
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External thermocouple placement for pyrometer
I have seen lots of posts about drilling and tapping the sensor.
The previous owner of my truck installed a pyro by attaching the sensor to the exhaust pipe with a band clamp. (post turbo)
The gauge has never worked since i have had the truck so when I tracked down the thermocouple i found the way it was installed and assumed it was wrong and probably damaged it.
I called around today looking for a replacement and DIS tells me that mounting to the outside of the pipe is the way they install thermocouples! Thet say it is preferrable.
Anyone heard of this - I have never seen a post about this method?
The previous owner of my truck installed a pyro by attaching the sensor to the exhaust pipe with a band clamp. (post turbo)
The gauge has never worked since i have had the truck so when I tracked down the thermocouple i found the way it was installed and assumed it was wrong and probably damaged it.
I called around today looking for a replacement and DIS tells me that mounting to the outside of the pipe is the way they install thermocouples! Thet say it is preferrable.
Anyone heard of this - I have never seen a post about this method?
Post Fiend
Joined: Jul 2005
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From: 21791
that way is alot easier than drilling and tapping a hole. however i feel it is the "jerry rig" way of doing it, to put it in FTE language. i would want the connection as strong as possible, so i used the tap in the manifold. when i bought my gauges, there was an option for drilling the up-pipe and using a clamp, but i didnt.
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From: Carhenge
I'm not sure I am understanding how it was installed.
If a hole was drilled in the pipe, and the clamp supplied with the gauges is used to hold the thermocouple in the pipe, that is a perfectly acceptable way of installing the sensor, although it would be better pre turbo.
I think you are saying that the thermocouple is simply clamped to the outside of the pipe(with no hole drilled at all)!? That is hillbilly.
If a hole was drilled in the pipe, and the clamp supplied with the gauges is used to hold the thermocouple in the pipe, that is a perfectly acceptable way of installing the sensor, although it would be better pre turbo.
I think you are saying that the thermocouple is simply clamped to the outside of the pipe(with no hole drilled at all)!? That is hillbilly.
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Joined: Jul 2001
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From: Palatka, FL
You got it it is hillbilly. The probe needs to be inside the pipe for best accuracy and needs to be BEFORE the turbo. Either drilled and tapped into the manifold or into one of the up pipes from the manifold to the turbo with the band clamp. I used the band clamp and drilled my up pipe and I've had no problems for almost 2 and a half years now. Plus I would think that if the thermocouple were on the outside of the pipe, The guage would never read as hot as it should or respond as fast due to the exhaust heating the metal before the probe.
Posting Guru
Joined: Feb 2004
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From: Elverson, PA
Originally Posted by Boss300
Plus I would think that if the thermocouple were on the outside of the pipe, The guage would never read as hot as it should or respond as fast due to the exhaust heating the metal before the probe.
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Thats what I was thinking.. but Diesel Injection Service says otherwise. ?
They did say that they use a different thermocouple for the external (slightly more $)
Gotta admit it would be a heck of a lot easier!
They did say that they use a different thermocouple for the external (slightly more $)
Gotta admit it would be a heck of a lot easier!
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Post Fiend
Joined: Feb 2002
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From: Carhenge
Pretty much all the pyro kits come with a weld in bung or the clamp for pipe installation, but they all require a hole to be drilled so the thermocouple goes in the actual exhaust stream. I can't imagine you can get any useful real time readings from outside.
Drilling and tapping the manifold is not at all hard to do. It probably takes 5 minutes. The hardest part is building up the fortitude to just do it.
Drilling and tapping the manifold is not at all hard to do. It probably takes 5 minutes. The hardest part is building up the fortitude to just do it.
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From: 21791
Originally Posted by clux
Pretty much all the pyro kits come with a weld in bung or the clamp for pipe installation, but they all require a hole to be drilled so the thermocouple goes in the actual exhaust stream. I can't imagine you can get any useful real time readings from outside.
Drilling and tapping the manifold is not at all hard to do. It probably takes 5 minutes. The hardest part is building up the fortitude to just do it.
Drilling and tapping the manifold is not at all hard to do. It probably takes 5 minutes. The hardest part is building up the fortitude to just do it.
Post Fiend
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From: Carhenge
Originally Posted by strokin_it7.3
took me almost an hour. plus it was 10:30 at night, and it was a schoolday the next day, so i had to hurry, yet take my time because i didnt want to 'eff it up. the cast iron destroyed the tap, although it cut perfect threads in the manifold.
I had my pod all assembled, but it took me just over an hour to install all three gauges, and I tapped the intake horn for boost as well.
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Joined: Oct 2004
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From: Portland, Maine
I was thinking that the probe clamped on the outside was alittle more than hillbilly kinda the other end of the spectrum, I dont even think a hillbilly would screw something like that up that bad. IMHO that just sounds rigged and dont know how it could ever work "right" I have used both drilled and tapped and drill and clamp and both have worked perfectly well with no problems
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From: Elkhorn, WI
i cant believe someone would actually do that. common sense tells you it has to go into the exhaust flow if you are reading exhaust temperature. he might as well just taped it on the mirror. i would check the truck carefully to make sure nothing else is messed up like that.
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