That's what I use here, too, Tom. My pal Bob Grinder has one, too, and he
uses it on his MG-TD.
We've compared readings between his instrument and mine and they're quite
repeatable.
The Heathkit CI-1080 uses two thermistor beads in what's called a bridge
circuit. One thermistor bead is the reference, and it's at ambient
temperature. The other measures EGT (exhaust gas temperature). If the two
are the same temp the bridge is balanced at zero. When you insert the probe
in the exhaust stream, the bridge gets unbalanced and the zero-center meter
indicates CO and air/fuel ratio.
I like using it on my BT7's dual exhaust, to ensure a match between the two
pipes/carbs.
BTW, I used to work for Heathkit years ago!
== Alex in Maine
"The Blue Mainie," 1960 Austin Healey 3000 BT7
"Conkling," 1946 MG TC #1321
Former owner 1957 A-H 100-6, 1967 A-H BJ8,
1965 MG Midget
http://users.adelphia.net/~alexmm/ai2q.htm
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