KS Avionics, Inc.

The Tetra II is a top of the line systems that provide EGT and CHT monitoring on 4 cylinders. (note there are multi-engine versions of the Tetra, consult factory)

The Tetra II. The Tetra II is an EGT/CHT selectable instrument that has 4 vertical analog needle displays to monitor combustion in all 4 cylinders simultaneously. Since there are no switches to turn you have the full engine temp picture at once. The EGT/CHT scale control allows all 4 pointers to be aligned in flight, hence any engine temp changes will be immediately apparent.

Why use Tetra II?
Engine performance is a function of fuel-air ratio. Tetra II allows you to adjust the mixture properly by responding to exhaust gas temperature (EGT) readings as they reflect fuel-air ratio.

EGT/CHT measurement and response settings are simple on the Tetra II expanded scale, which covers 250° F in 25° increments.

At constant throttle setting, a variation in mixture will cause the EGT to rise and fall -- with the peak EGT occurring when the fuel-air ratio is chemically correct.

Engine manufacturers recommend the EGT be used for continuous operation be set at least 25°F below the peak EGT, preferably enriching the mixture.

Maximum available power is attained by enriching the mixture for an EGT drop of 100°F below the peak.

In this way, you choose between fuel economy or maximum available power, or any intermediate condition