Pyrometer
Senior User
Joined: Mar 2006
Posts: 201
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From: San Carlos, CA
Many post suggest mounting the pyro before the turbo and monitor piston temps that melt at above 1200f. You can order pyros calibrated for before or after the turbo. I just installed one before the turbo on the passenger side exhaust manifold. All I had to do was remove the tire and mud flap and there was the side of the exhaust. I bought a clamp type mount from ISSPRO so all I had to do was drill a 1/4 inch hole and tighten the clamp to mount (just made sure the clamp could go around the exhaust manifold).
i ain't rite
Joined: Mar 2005
Posts: 65,554
Likes: 5,590
From: Marlboro Mental Hospital.
Aaron, i would not worry about putting the pyrometer before the turbo. with the placement as it is, you will damage the turbo before you damage the engine.
that is why banks put it after the turbo.
that is why banks put it after the turbo.
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Joined: Jul 2006
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From: Prunedale CA
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i ain't rite
Joined: Mar 2005
Posts: 65,554
Likes: 5,590
From: Marlboro Mental Hospital.
normally a pyrometer in the exhaust manifold is done on non turbo engines. all my large trucks have the pyro after the turbo like the banks unit does so you can watch the temps to protect the turbo.
if the driver pays attention to the temps. i have had to replace 2 turbos in the past 3 months due to driver error in bot paying attention, and running the exhaust temps to 1300º+ for extended periods cause they were to lazy to downshift, and they melted the turbo impellers.
and in the past year mack has gotten 2 trucks back for warranty repair after the computers screwed up and read the wrong readings from the pyros and melted the engines.
if the driver pays attention to the temps. i have had to replace 2 turbos in the past 3 months due to driver error in bot paying attention, and running the exhaust temps to 1300º+ for extended periods cause they were to lazy to downshift, and they melted the turbo impellers.
and in the past year mack has gotten 2 trucks back for warranty repair after the computers screwed up and read the wrong readings from the pyros and melted the engines.
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Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
Actually the pistons have a lower melting temp than the turbo fan does.
Granted it is only 20 degrees lower and the oil cooling jets on the pistons probably offset that 20 degrees.
I am old school on pyrometers, I say exhaust manifold for the thermocouple.
I mounted mine on the drivers side right before the cross over pipe connection.
Pistons are in danger from heat damage at 1250 degrees and the turbo impeller is good for 1270. So I feel comfortable running it to 1200 degrees.
I have only driven one truck in my over the road career that had the thermocouple mounted after the turbo. It was hard to remember it could not go over 900 degrees after all those pre turbo trucks that could go to 1200.
Granted it is only 20 degrees lower and the oil cooling jets on the pistons probably offset that 20 degrees.
I am old school on pyrometers, I say exhaust manifold for the thermocouple.
I mounted mine on the drivers side right before the cross over pipe connection.
Pistons are in danger from heat damage at 1250 degrees and the turbo impeller is good for 1270. So I feel comfortable running it to 1200 degrees.
I have only driven one truck in my over the road career that had the thermocouple mounted after the turbo. It was hard to remember it could not go over 900 degrees after all those pre turbo trucks that could go to 1200.
i ain't rite
Joined: Mar 2005
Posts: 65,554
Likes: 5,590
From: Marlboro Mental Hospital.
hey Aaron, i just had a moment of intelegence where the senility took a few seconds off. i have no idea what i was thinking when i told you the thermocouple was after the turbo. it is BEFORE the turbo, in the turbo mounting plate, about 2-3 inches from the impellers.