crankcase ventilation

circulation of air through the crankcase of a running engine to remove water, blow-by, and other gases in order to prevent oil dilution and contamination, sludge formation, and pressure build-up.
Also see

Dictionary of automotive terms. 2015.

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  • Crankcase ventilation system — A crankcase ventilation system is a way for gases to escape in a controlled manner from the crankcase of an internal combustion engine. A common type of such system is a positive crankcase ventilation (PCV) system, the heart of which is a PCV… …   Wikipedia

  • crankcase ventilation system — See positive crankcase ventilation system …   Dictionary of automotive terms

  • positive crankcase ventilation — (PCV) A process introduced in 1963 for preventing the buildup of harmful acid producing combustion gases within the crankcase. See closed crankcase ventilation …   Dictionary of automotive terms

  • positive crankcase ventilation system — (PCV) A process for preventing the buildup of harmful acid producing combustion gases within the crankcase. See closed crankcase ventilation …   Dictionary of automotive terms

  • positive crankcase ventilation — Auto. a means of reducing air pollution by directing the fumes from the crankcase of an engine into the intake manifold, so that they will be channeled into the cylinders and burned. Abbr.: PCV * * * …   Universalium

  • closed crankcase ventilation — A system in which crankcase vapors are discharged into the engine intake system (usually through the intake manifold) and pass through the engine cylinders rather than being discharged into the atmosphere …   Dictionary of automotive terms

  • positive crankcase ventilation valve — (PCVV) a one way valve which controls the flow of vapors from the crankcase into the engine …   Dictionary of automotive terms

  • positive crankcase ventilation — Auto. a means of reducing air pollution by directing the fumes from the crankcase of an engine into the intake manifold, so that they will be channeled into the cylinders and burned. Abbr.: PCV …   Useful english dictionary

  • Crankcase — For other uses, see Crankcase (disambiguation). De Dion Bouton engine from about 1905, in which can clearly be seen a discrete crankcase with upper and lower halves (each a casting), with the bottom half constituting both part of the main bearing …   Wikipedia

  • ventilation — [1] A provision of a free or controlled circulation of air. [2] Forced airflow, by design, between one area and another. See closed crankcase ventilation crankcase ventilation flow through ventilation positive crankcase ventilation system… …   Dictionary of automotive terms

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