That interesting. I have had some mild erosion at the tips with a couple of probe failures.     Do you know what material the outer shell is made of? I’m not sure about mine but I know inconel shells are available. I believe 3/16” and 1/4” inconel probes are available for pre-turbo applications vs 1/8”. 

Bobby

Several EGT thermocouples have failed internally during the last 500 hours of operation.  The failed thermocouple that I removed today was missing over an inch of the probe.  If it had been upstream of a turbo, the result would probably have been unpleasant.

Steve Boese

RV6A, 1986 13B NA, RD1C, EC2

<EGT TC failure s.jpg>

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