Explanations: Reciprocating Flashcards
What is the purpose of installing two or more springs on each valve in an aircraft?
Every mechanical device has a resonant frequency. If the valve is operating at the resonant frequency of the valve spring, the spring will lose its effectiveness and will surge, allowing the valve to float.
By using two or more valve springs wound with a different pitch and a different size wire, the resonant frequency of the springs will be different and there will be no RPM at which the valves float.
What is volumetric efficiency?
Volumetric efficiency in internal combustion engine engineering is defined as the ratio of the mass density of the air-fuel mixture drawn into the cylinder at atmospheric pressure to the mass density of the same volume of air in the intake manifold.
