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  #1  
Old 05-02-2010
Paul Paul is offline
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Default Cooler exhaust temps

Replaced most of my exhaust with stainless steel parts. Am now on a trip with the new exhaust and I have noticed my pyro readings are MUCH cooler. Previously, I would cruise 550-650 degrees with a rise to 750-800 in the mountains. Now I cruise at 450 and haven't exceeded 650-700 degrees pulling long climbs in 4th and 3rd.

We reused my new/old pyro (installed new in NH in a parking lot in the fall) so the only change was to SS.
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  #2  
Old 05-02-2010
davidmbrady
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Paul,

I wish your exhaust gas temps were reduced but it's not likely. More likely is that stainless has a higher resistivity than steel. 304 stainless has a resistivity of around 7.2(10**-7) ohm-m while 1020 low carbon steel has a resistivity of 1.6(10**-7) ohm-m. What's probably happening is that a larger part of the induced voltage on the pyrometer sensor is being eaten up by the stainless steel. In other words, it's behaving like a bad ground!
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Old 05-02-2010
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rwoody rwoody is offline
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And if its not in the exhaust manifold its is not too accurate for the safety of the valves and pistons
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Old 05-05-2010
fxdwg fxdwg is offline
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BB put the pyro for the 60 in the up tube coming out of the turbo. It's probably 1 foot or more from that, too. Only useful for comparison and something to look at. Not worth a hoot to protect the motor.
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Old 05-05-2010
davidmbrady
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Quote:
Originally Posted by fxdwg View Post
BB put the pyro for the 60 in the up tube coming out of the turbo. It's probably 1 foot or more from that, too. Only useful for comparison and something to look at. Not worth a hoot to protect the motor.
Why not add an offset (couple hundred degrees) to get the manifold temp?
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Old 05-05-2010
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jyclegg jyclegg is offline
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Quote:
Originally Posted by davidmbrady View Post
Paul,

I wish your exhaust gas temps were reduced but it's not likely. More likely is that stainless has a higher resistivity than steel. 304 stainless has a resistivity of around 7.2(10**-7) ohm-m while 1020 low carbon steel has a resistivity of 1.6(10**-7) ohm-m. What's probably happening is that a larger part of the induced voltage on the pyrometer sensor is being eaten up by the stainless steel. In other words, it's behaving like a bad ground!
What type of probe is it? Is it a thermocouple? How does the ground enter into the result? Are there connections?
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Old 05-05-2010
davidmbrady
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Quote:
Originally Posted by jyclegg View Post
What type of probe is it? Is it a thermocouple? How does the ground enter into the result? Are there connections?
I believe it's a probe with a single wire connected to it.
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  #8  
Old 05-05-2010
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aaronw aaronw is offline
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Quote:
Originally Posted by davidmbrady View Post
I believe it's a probe with a single wire connected to it.
I have one in my tool box, two wire device. I have no idea how it works though. Put the power of Google to work............
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Old 05-05-2010
davidmbrady
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Originally Posted by aaronw View Post
I have one in my tool box, two wire device. I have no idea how it works though. Put the power of Google to work............
Wow, I'll have to check mine. If it's 2 wire, then Paul's exhaust temps may indeed have gone down - maybe due to decreased backpressure????
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  #10  
Old 05-05-2010
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Ed Wimberley Ed Wimberley is offline
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Gentlemen

The pyro temp sensor is a platinum wire RTD Restive thermal device
it operates by changing resistance with temperature this is scaled to temp
readout on gauge,really simple but can break wire from time to time.
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