Egt Probe, Pre Or Post Turbo Questions

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thebestofindica

47 posts · Joined 2003

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#2 · Dec 19, 2006

Pre-turbo is probably the way to go. Post will read 300* cooler or so than pre-turbo will. There are many airplanes with multi-million dollar engines that are running thermocouples that have never had problems. Either way is fine, pre-turbo is better.

 

chatcr250

402 posts · Joined 2006

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#3 · Dec 20, 2006

X2 On pre-turbo. I have had four different diesels and all have had the thermocouple in the manifold, pre-turbo, and have never had a problem. I have heard these stories of probes breaking, melting, ect, but have never seen one personally. I have carried over my Auto Meter pyrometer from my first diesel, and the thermocouple still looks fine, shows no signs of cracking or melting.

 

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Horsepower Upgrades

391 posts · Joined 2006

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#4 · Dec 21, 2006

These Inconel thermocouples are lifetime warrantied by companies like DiPricol, they wont break.

 

bo799

874 posts · Joined 2006

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#5 · Dec 22, 2006

Pre turbo here

 

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gmcya

704 posts · Joined 2006

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#6 · Dec 22, 2006

I find the post turbo reading to be pretty much useless. There is way to much cooling taking place in the turbo to get a consistent reading. I want to know what I am hitting it with. I look at it this way, either I run the probe and take a chance of it breaking/melting and killing the turbo or I don't run a probe and fry it from not being able to monitor the egt's. With a programmer a egt probe in the manifold is a must. I had the alarm set to 1450 and hit it on level 3 passing a rig up an overpass with no load. There is no way I would tow with any type of hp boost without it. That's my story and i'm sticking to it.

 

jevanb

702 posts · Joined 2006

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#7 · Dec 22, 2006

thebestofindica;1476431; said:

Pre-turbo is probably the way to go. Post will read 300* cooler or so than pre-turbo will. There are many airplanes with multi-million dollar engines that are running thermocouples that have never had problems. Either way is fine, pre-turbo is better.

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all TCharged horiz opposed light single and multi engine engines have the probe in the exhaust stack about 2-3 inches fron the flange, . the only multi million dollar aricraft engines are turbofan,turbo prop, and jet and their probes are the last thing the exhaust sees before it exits the exhaust nozzle, (right behind the turbine nozzle look in the exhaust and you can see it). if they break no big deal inless it hit you on the head forn 35k feet, for the last 23 years I have never seen one break, been flying a long time and as a licensed mechanic (A&P),(civ,navy)