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The camshaft is often referred to as the “engine’s timing director” because it precisely controls the opening and closing of the intake and exhaust valves. As the camshaft rotates, its lobes push against lifters, rocker arms, or directly against the valves to create motion. This timing ensures that air-fuel mixture enters the cylinder at the right time and exhaust gases exit efficiently.
High-performance engines may use special cam profiles to optimize power, torque, or fuel efficiency. Advanced engines also use variable cam timing systems to adjust valve operation dynamically under different driving conditions.
The camshaft is a rotating shaft in an internal combustion engine that controls the timing and operation of the intake and exhaust valves. It ensures that the valves open and close at the precise moments needed for optimal engine performance.
Cams (Lobes) – Oval-shaped protrusions on the shaft that push against valve lifters or rocker arms to open valves.
Shaft – The main body of the camshaft that rotates, driven by the crankshaft via gears, timing belt, or chain.
Bearing Journals – Surfaces that allow the camshaft to rotate smoothly within the cylinder head or engine block.
Timing Marks – Reference points that align the camshaft with the crankshaft for proper valve timing.
Material – Usually made from cast iron, steel, or billet for durability and resistance to wear.
Valve Control – Can be single overhead cam (SOHC), double overhead cam (DOHC), or cam-in-block design, depending on engine type.
Adjustable or Variable Timing – Some modern camshafts feature variable valve timing (VVT) for improved performance and fuel efficiency.
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