Every engine has some sort of crankcase breathing system. The internal combustion process creates pressure, some of which makes its way past the piston rings-along with fuel vapors-and into the rest ...

Crankcase blow-by is hot gases that sneak past the piston rings. As of 2007, the U.S. Environmental Protection Agency limits nonmethane hydrocarbons to 0.14 grams per bhp-hr. Blow-by gases are rich in ...

Although some maintenance schedules include an interval for replacing the positive crankcase ventilation, or PCV, valve, others may not. In the latter case, a general recommendation is to replace the ...

Rigorous SAE/TMC Type II fuel economy testing by Auburn University showed a 3.5% improvement in fuel economy for a Class 8 tractor fitted with a new aftermarket closed crankcase ventilation (CCV) ...

The PCV (Positive Crankcase Ventilation) system is designed to regulate and remove fumes from the engine crankcase, and to alleviate crankcase pressure which could cause oil leaks or seal damage. The ...

We don't mean to be the harbingers of doom, but it's unwise to keep driving if your car's engine has a malfunctioning positive crankcase ventilation (PCV) system, particularly a bad PCV valve.