Here, we are required to determine what/ which part of the engine provides the pressure needed to return the valves to a closed position once the camshaft rotates.
The spring provides the pressure needed to return the valves to a closed position once the camshaft rotates.
First, A camshaft as implied by its name is a rotating object which is usually metallic and contains pointed cams, which are responsible for the conversion of rotational motion to reciprocal motion. Camshafts are a major component of internal combustion engines(ICEs) (to operate the intake and exhaust valves),mechanically controlled ignition systems and early electric motor speed controllers. Camshafts are a key factor in determining the rev. per minute (rpm) range of an engine's power band.
However, upon rotation of the camshaft in Internal Combustion Engines (ICEs), individual valves is open by the action of a tappet, pushrod and rocker arm.
The valve is closed by valve spring pressure.
Valve springs have two functions primarily:
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