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A crankcase ventilation system (CVS) removes unwanted gases from the crankcase of an internal combustion engine. The system usually consists of a tube, a one-way valve and a vacuum source (such as the inlet manifold). The unwanted gases, called "blow-by", are gases from the combustion chamber which have leaked past the piston rings. Early ...
The first type of Skydrol used in aviation was Skydrol 7000 (now obsolete), which was dyed green in colour, as a fire-resistant lubricant in Douglas-designed cabin pressure superchargers (as piston-engined airliners do not have 'bleed air' pressurisation) used in the DC-6 and -7 series piston-engined aircraft, and first flight tested by United ...
Also, soot getting into the lube oil can cause crankcase dilution, but there are additives that can keep the soot at the top of the lube oil. Soot that collects in the crankcase fully goes away when the lube oil is changed out of the engine. Additives can be added to the oil to cause the soot to stay on top of the engine lube oil. [4] These ...
Failure to use the correct specification oil has been known to cause PCV (positive crankcase ventilation), VVT (variable valve timing) system, gasket and sealing system, and other internal combustion component premature clogging and other failures. Some of the additives in those specs are designed to aid in keeping systems lubricated and clean.
If these gases accumulated within the crankcase, it would cause unwanted pressurisation of the crankcase, contamination of the oil and rust from condensation. [8] To prevent this, modern engines use a crankcase ventilation system to expel the combustion gases from the crankcase. In most cases, the gases are passed through to the intake manifold.
Engine oil seeps down under gravity into the cylinder through various means (through the rings, valve guides, etc.) and can fill a cylinder with enough oil to hydrolock it. The seepage effect can be observed by the blue-white smoke commonly seen when a radial engine starts up.
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