Future Directions For The Internal Combustion Engine And How It Has Af

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Also a small amount of solid matter, or particulates, is emitted in the form of lead from the tetraethyl lead used in fuel to increase its octane rating. It was found that these pollutants were having an adverse effect on the environment and in extreme cases were actually causing visible ?smog.' But exhaust emissions in pre-70's cars were only accounting for 55% of automotive air pollutants...
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Another major source was emissions of hydrocarbons from the engine's crankcase. They occurred because during combustion there is a small amount of gas ?Blow-By' past the rings, consisting mainly of unburned fuel. This would enter the crankcase and it would then be simply vented into the atmosphere. One of the earliest emission control requirements was to prevent this by using ?Positive Crankcase Ventilation' or P...
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