Pyrometer thermocouple installation location
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Yes, ideally it would be nice to see if I was about to melt piston 2, but that would require 8 pyros and gauges. Best measure then is at the manifold itself or as close to it on the up pipe. This leaves the passenger side to fend for itself as you assume that is the same. That is where a DP installed sensor can average but we have no idea how much cooling effect the turbo has for sure. The rule of thumb is about 200*. Since guessing is not cool, we go as close to one side as we can and assume the other is similar.
Pyros are not to save your turbo but to prevent melting a piston. Of course timers do help prolong the bearings in the turbo when they are hot so do not dismiss this. Never shut down a turbodiesel with high egts because it can supposedly cook the oil in the turbo bearings.
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Tuned
Joined: Dec 2008
Posts: 342
Likes: 5
From: San Diego, Tx
Thanks for the clarification. I do know what the exhaust manifold is, I've actually rebuilt gas engines but am still learning with diesel and turbos. I can follow the manifold out to the up pipe and figure it out from there.
Freshman User
Joined: Aug 2009
Posts: 31
Likes: 0
Mike,
Yep, you got it. To be totally right you'd have to measure each port. Not practical so go for the up-pipe. Good as anyone can expect.
And as a correction the EGT is not to measure a turbo melting temp...it's to measure what is going on in the combustion chamber. The turbo will only sustain damage if the pistons have done the same. At that point YER DONE!
Yep, you got it. To be totally right you'd have to measure each port. Not practical so go for the up-pipe. Good as anyone can expect.
And as a correction the EGT is not to measure a turbo melting temp...it's to measure what is going on in the combustion chamber. The turbo will only sustain damage if the pistons have done the same. At that point YER DONE!
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Tuned
Joined: Dec 2008
Posts: 342
Likes: 5
From: San Diego, Tx
Thanks, everyone, for the help. I was a little worried about installing the thermocouple but the info you guys gave me got me in the right spot and it was really a breeze. Installing the tranny temp sender took more time than putting in the pyro thermo.
Posting Guru
Joined: Jul 2004
Posts: 1,777
Likes: 0
From: Buckingham, IA
I see what you are saying but you want an aggregate of the temp going to the turbo from the manifold. This is more about melting pistons than damaging the turbo. That is why post turbo or down pipe pyro installs are less desirable.
Yes, ideally it would be nice to see if I was about to melt piston 2, but that would require 8 pyros and gauges. Best measure then is at the manifold itself or as close to it on the up pipe. This leaves the passenger side to fend for itself as you assume that is the same. That is where a DP installed sensor can average but we have no idea how much cooling effect the turbo has for sure. The rule of thumb is about 200*. Since guessing is not cool, we go as close to one side as we can and assume the other is similar.
Pyros are not to save your turbo but to prevent melting a piston. Of course timers do help prolong the bearings in the turbo when they are hot so do not dismiss this. Never shut down a turbodiesel with high egts because it can supposedly cook the oil in the turbo bearings.
Yes, ideally it would be nice to see if I was about to melt piston 2, but that would require 8 pyros and gauges. Best measure then is at the manifold itself or as close to it on the up pipe. This leaves the passenger side to fend for itself as you assume that is the same. That is where a DP installed sensor can average but we have no idea how much cooling effect the turbo has for sure. The rule of thumb is about 200*. Since guessing is not cool, we go as close to one side as we can and assume the other is similar.
Pyros are not to save your turbo but to prevent melting a piston. Of course timers do help prolong the bearings in the turbo when they are hot so do not dismiss this. Never shut down a turbodiesel with high egts because it can supposedly cook the oil in the turbo bearings.
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