Question

In what year was the positive crankcase ventilation (pcv) first used on vehicles' emission systems?

Answer 1

Until the early 1960s, these blow-by gases were removed simply by letting air circulate freely through the crankcase, wafting away the gases and venting them as emissions. Then, in the early1960s, positive crankshaft ventilation (PCV) was invented. This is now considered the beginning of automobile emission control.



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