A BOV or blow off valve is found inside a turbocharged engine. BOV prevents the occurrence of a phenomenon called compressor surge and reduces the probability of engine wear and tear. These one-way valves release the compressed air into the atmosphere above a specific set pressure.
Identification of a BOV or blow off valve
While releasing the compressed air into the atmosphere, a BOV produces a distinct sound. This feature of a blow off valve is appreciated by many buyers and is the reason for trumpet-shaped BOVs. This shape of a BOV improves the hissing sound, which is similar to many turbocharged sports cars.
Caution
The blow off valve or BOV sound is not always beneficial. Vehicles that have the BOV positioned immediately after the mass airflow sensor can confuse the engine's control unit leading to a stalling or halting. This confusion can occur during the closing of the throttle. In many instances, the higher boost pressure aggravates the situation making it only worse. Such instances can spoil the foul spark plugs and the catalytic converters. This can alsolead to the combustion of the unburned fuel and melting of the converter.
Function of a BOV or blow off valve
A blow off valve or BOV is responsible for controlling the compressor surge. A compressor surge or compressor stall is the uncharacteristic airflow that results from lifting the throttle from a turbocharged vehicle, which lacks a bypass valve or has a defective one.
Operation of a blow off valve or BOV
A vacuum hose connects a BOV to the intake manifold and when the throttle closes, it reduces the relative pressure of the intake manifold below the zero bar. This difference in the low and high pressure runs the piston of the blow off valve or BOV. Next, the excess pressure of the turbo charger is let out into the atmosphere or redirected to the intake upstream of the compressor inlet.
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