Robert Dunleavy
>> Be very careful using a ring terminal under the spark plug. In my
experience in my volksplane it was very difficult to prevent them from
leaking, which lets the cylinder suck in air and run lean, ie hot. <<
Ring terminals are a pretty common way of mounting CHT thermocouples to
all kinds of things. Don't you have a ring terminal under your head
stud now? Seems like a leakage problem with the under-the-sparkplug CHT
probe would most likely be caused by putting a ring larger diameter than
the sparkplug over the plug's counterbore, thus never really sealing at
all. That's why I was careful to choose a ring terminal that would fit
in the counterbore. Otherwise, it's just an aluminum crush washer, very
similar to what normally comes with spark plugs, oil drain plugs, and
sensors on cars. Also I can say is that I've never had that problem,
and I've been running CHT probes under plugs for something like 45 years
now, and the one time I tried the stud method the stud broke a few days
or weeks later. Only stud I've ever had break, and I've been driving
and flying behind VWs and Corvairs for a long time.
Mark Langford
[email protected]
http://www.n56ml.com
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