"Dan Luke" wrote in message
...

"Kyle Boatright" wrote:

Conventional wisdom is that the ring type will show significantly higher
temperatures than the probe type. I've seen differences reported as up
to 50F between the two types.

That's opposite to my experience. My JPI has one ring and three probes;
the ring always reads 40-50 deg. F. cooler in cruise.

--
Dan
C172RG at BFM

Interesting, Dan. I have two different CHT systems installed - one is a 4
position unit which has ring type thermocouples on each cylinder. The other
has a single probe mounted to Cylinder 4. I did it that way because I wanted
to have the most accurate measure on the hot cylinder (#4 in my application)
over the long term, but added the ring type system to allow comparisons
between cylinders during the flight test of my RV. Since I have not found a
need (or excess funds) to free up the panel space from the 2nd CHT gauge,
I'm still flying with both gauges.

I always see higher temperatures on the ring type CHT than on the probe type
installed on the same cylinder.

KB