Quote:
Originally Posted by Bruce of MN
What is the benefit of fresh air in the crankcase?
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Positive Crankcase Ventilation removes blow-by gases, water vapor (byproduct of combustion and condensation), and fuel vapors (from cold starts). This helps reduce sludge formation. It also helps people feel good about their modification.
One thing often overlooked is that the air entering the crankcase should be filtered. Otherwise you are drawing dust into your crankcase. The original vent cap is not a very good filter.