Camshaft Work:
As the camshaft rotates, the cam lobes move up and down. In DOHC engines, every rotation causes one cam lobe to push the valve down, opening it into the cylinder. Similarly, in SOHC and pushrod engines, the cam lobe pushes on the rocker arms (or pushrods then rocker arms), opening the valve. Because the cam lobe rotates further, the valve spring forces the valve to make a copy, closing it.
The camshaft is sometimes connected to the crankshaft employing a timing chain or timing belt. In some pushrod engines, timing gears may additionally be used. The camshaft gear has twice as many teeth because the crankshaft gear, which allows it to rotate at half the speed of the crankshaft. The camshaft has four distinct strokes: intake, compression, power, and exhaust.
Common camshafts are made to match typical operating characteristics and will accentuate highway cruising efficiency or low-end power. Similarly, valve “lift” refers to the peak of the lobe about the middle of the shaft, which determines how far the valve opens. On fixed camshafts, this can be not adjustable, but there are circumstances at which the engine might “breathe” better if only the valves could open a touch more.
Also, a hard and fast camshaft might open the valve 10° before TDC (BTDC) and shut it 5° after bottom spatial relation (ABDC) and open the valve 15° before bottom spatial relation (BBDC) and shut it 5° ATDC. This is often cited as valve opening duration. This works well on average but doesn’t excel in anyone’s driving situation. Read and learn about car Technical FAQ and get in-depth details of the car features.
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