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Originally Posted by Howerton Engineering
On a side note, I have number of TC's throughout the inlet track on my car and find that some fail very quickly from what seems to be high frequency vibration. I use small exposed element units as well. 3500km seems about average for some of the problem units I have. It's hard to find something that reacts fast enough but is durable as well.
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Tell me about it, on this car I have recorded on average much higher EGT temps than I am usually used to but Ironically the pipes and turbo after a run show not as much basic color "glowing" I always used shielded probes and run them much closer to the wall of the pipe, this time I decided to use exposed versions of smaller wire diameter for both elements and allot closer to the center region of gas flow, the response was unreal and for the first time I was getting real EGT readings that were comparable to other data I have on file from SAE wankel engine reports *turbocharged* even have one from an old Lotus 4 cyl turbo which showed 1000+deg C temps pre turbo on moderate power of only about 200bhp or so and T3 frame turbo.
I believe I got the true readings but as you say the longevity is just not there, I guess there is no basic solution to this... all things like moving them closer to outer wall, using thicker wire constructions and even shielding will all help but you will never know the true temperatures :? They did do their job though so am happy, I established a pattern for fuel richness to EGT and try to strike a balance between those two and not have miss fire due to inadequate ignition energy. Thing I did notice (just as in one excellent paper I have on the topic) that excessive WI on a heavy mixture even with full spark and no apparent miss fire does cost a lot of power with coolish charge temperature.