David .... you mention about the lack of "straight" (I assume you mean pure or molecular) oxygen gas (or O2). You mention detecting oxygen in CO2 and NO2 ..... are you saying those oxygen "atoms" (not molecules) are involved with all of this in measuring the oxygen levels in engine exhaust? I know little of how this all works for exhaust analysis but the oxygen in NO2 and CO2 is not molecular oxygen anymore I don't think (just like the hydrogen in water (H2O) is not molecular hydrogen. I would be very surprised if those atoms were involved with the O2 measurement in exhaust gases. But correct me if I'm wrong or misreading what you said.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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