Crankcase breather set Naraku racing silver in color / crankcase ventilation system
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Why a crankcase breather?
By the downward movement of the piston, pressure builds up in the crankcase to which the power decreases since the work force of the piston is not transmitted exclusively to the crankshaft but additionally counteracts the back pressure in the crankcase. By a sufficiently large surge, the engine is revving and can translate more power to the road.
The same effect will be negative during the upward movement of the piston, only this is a negative pressure, which is also offset to the vent.
Of course, all engines already have a factory crankcase breather but it is quite small and is not really suitable for modified and more powerful engines.