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Old 10-18-2020, 09:58 AM   #40
tubman
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Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,260
Default Re: Autolite Spark Users Only

An "Air/Fuel" meter will tell you the ratio of fuel to air in the intake charge (generally around 14:1) by analyzing the engines exhaust. They essentially need two inputs; 12 volts to power them and a feed from the exhaust. They come with a special cable and a sensor the mounts into the exhaust stream. This can be done in one of two ways; either a bung can be welded into the exhaust pipe (ideally 36" from the exhaust port), or a "Sniffer Tube" that clamps temporarily into your tail pipe. . Obviously, the former is a better way of doing it, but that latter usually is satisfactory.

I have one mounted on my engine test stand. It works well, and cost about $120, including the gauge, cable, and sensor.
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