On the typical American-made vehicle we have an emissions control device in the exhaust system known as the catalytic converter. This device is mandated by the United States Government.
The stated function of the catalytic converter is to burn unused exhaust gasses exiting the engine before they reach the atmosphere.
WHAT?
Why, I ask you, are these gasses not burned in the engine, producing power to move the vehicle, and thus reducing fuel consumption?
In other words, we burn some of the fuel coming through the injection system in the engine, and then burn the rest of it in the CC where it produces absolutely no benefit whatsoever!
The CC might have made sense in the last days of the older systems when it was originally developed. Back then, gasoline engines used a fuel delivery system known as the carburetor which sprayed an manually adjustable mist of gasoline into the air intake system of the vehicle's engine.
While the parts were precision machined to the best spec's of the day, the design was NOT terribly efficient.
Today however, engines are controlled by an onboard computer that monitors and adjusts EVERY aspect of engine operation, including the exact moment the fuel is delivered to the cylinder, the exact moment the ignition spark is delivered, the exact moment the intake and/or exhaust valve is opened, and most importantly: the air-fuel ratio!
HOW CAN THERE BE UNBURNED FUEL?
GOOD QUESTION?
According to one source of information I have, your engine onlyuses about 20% of the fuel it takes in to produce power, the rest is wasted as heat and emissions!
Since every function of the engine is controlled by a computer programmed by the automobile manufacturer, I have to wonder if the auto companies are in league with the oil companies.
Duhh... Surely Not!
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