Ventilation of cars

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Ventilation of cars

Early provisions[ edit ] From the late 19th century through the early 20th, blow-by gases from internal combustion were allowed to find their own way out to the atmosphere past seals and gaskets. It was considered normal for oil to be found both inside and outside an engine, and for oil to drip to the ground in small but constant amounts.

The latter had also been true for steam engines and steam locomotives in the decades before. Even bearing and valve designs generally made little to no provision for keeping oil or waste gases contained. Sealed bearings and valve covers were for special applications only.

Gaskets and shaft seals were meant to limit loss of oil, but they were usually not expected to entirely prevent it. On internal combustion engines, the hydrocarbon-rich blow-by gases would diffuse through the oil in the seals and gaskets into the atmosphere.

Engines with high amounts of blow-by e. Ventilation of cars draft tube[ edit ] The first refinement in crankcase ventilation was the road draft tube, which is a pipe running from a high location contiguous to the crankcase such as the side of the engine block, or the valve cover on an overhead valve engine down to an open end facing down and located in the vehicle's slipstream.

When the vehicle is moving, airflow across the open end of the tube creates a draft that pulls gases out of the crankcase. The high location of the engine end of the pipe minimises liquid oil loss.

An air inlet path to the crankcase, called the breather and often incorporated into the oil filler cap, meant that when a draft was generated at the tube, fresh air swept through the crankcase to clear out the blow-by gases.

Ventilation of cars

And non-road vehicles such as boats never generated a draft on the tube, no matter how fast they were going. To remedy this situation manufacturers located the breather air filter in the air stream coming from the engine radiator fan, the manufacturers also modified the breather to incorporate an air scoop to direct the air into the breather filter so that the engine could be ventilated while the car or truck was standing still.

This created pollution as well as objectionable odors. InProfessor A. Haagen-Smitof the California Institute of Technology at Pasadenapostulated that unburned hydrocarbons were a primary constituent of smogand that gasoline-powered automobiles were a major source of those hydrocarbons.

Withrow discovered in that the road draft tube was a major source—about half—of the hydrocarbons coming from the automobile. The PCV system thus became the first real vehicle emissions control device. Positive crankcase ventilation was first factory-installed on a widespread basis by law on all new model cars first sold in California.

The following year, New York required it. Bymost new cars sold in the U.Since , Ventaire has Designed and Manufactured Ventilation Systems and Components for Ventilating Noxious Fumes and Gases in Commercial and Industrial.

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Natural ventilation used to be the most common method of allowing fresh outdoor air to replace indoor air in a home.

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Today, it’s usually not the best ventilation strategy, especially for homes that are properly air sealed for energy efficiency. Car Engine Crankcase Ventilation System.

With Permission from: BenFenner link. While this article will use a Nissan SR20 engine as a reference, the information found here can be applied to all motors.

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