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exhaust valve

   Also found in: Dictionary/thesaurus, Acronyms 0.01 sec.
exhaust valve [ig′zȯst ‚valv]
(mechanical engineering)
The valve on a cylinder in an internal combustion engine which controls the discharge of spent gas.


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Developed jointly by the French firm and BMW, the hi-tech petrol unit features variable timing to control both inlet and exhaust valves and clever technology that allows the valve opening distance to be adjusted gradually, according to the position of the accelerator pedal.
To understand the innovation of the VTEC, one must first appreciate the delicacy of the timing in an engine in relation to the intake and exhaust valves that set in motion by the lobes of the camshaft.
The exhaust valves would increase by increments of 5% of the maximum airflow setpoint once the contaminant levels reached 50%, and they would continue stepping up the exhaust volume until the sensors read 40% of the acceptable exposure limits, at which point the exhaust valve would modulate down by 5% increments to maintain the 40% level.
 
 
 
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