LogFAQs > #893073331

First of all, they weren't fuel injection, so they didn't have the precise computer controlled measurements of fuel to burn in relation to air (which on a modern car is accomplished through many variables, generally Air Intake Temperature, Mass Air Flow, Manifold Absolute Pressure, Throttle Position, and then the accuracy of this data's result is adjusted and double checked by your Oxygen Sensors), you were just kind of guesstimating air/fuel by vacuum pressure back then. (Lawnmowers and chainsaws operate the same way as really old carburetor cars, because it would be extremely cost inefficient to fuel inject a $50 leaf blower.)

Second of all, there was no such thing as catalytic converters (and at the very least was not a legal requirement), which converts a lot of dangerous parts of exhaust such as Carbon Monoxide into Carbon Dioxide and things like that to be less harmful to your body and the Earth. It also helps absorb unburned fuel that accidentally escapes during the exhaust cycle.

And not to mention, likely used different leaded fuels like the two above me pointed out.
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Ever since the day you left, my path's been set unknown... How many years to walk this path alone?
So why'd you close your eyes... why can't I shut mine?