Duration is measured in degrees of crankshaft rotation, not camshaft rotation.

2 to 1 crankshaft turns 720 degrees crankshaft for 360 degrees cam shaft rotation. The camshaft gear has twice the number of teeth of the crankshaft. Camshaft Duration is the measurement of the time one valve begins to open until it finishes closing.

Car engines that use pushrods and have the camshaft mounted next to the crank use 2 gears directly meshed together.

The camshaft gear or sprocket has twice as many teeth as the gear or the sprocket on the crankshaft. Intake valve opens crank turns 180 valve closes crank pushes the piston up compresses this air fuel the intake valve let in 180 electricity causes a spark to jump the spark plug gap that ingnites the compressed air fuel mixture. Thus a four cycle engine was born.

You'll see duration specifications at .050 inches. This gives a 1:2 gear ratio, the camshaft turns at half the speed of the crankshaft. Thus every two revolutions of the camshaft produce one revolution of the camshaft and one opening and closing of each valve in the four-cylinder engine. The crankshaft drives the camshat through a series of gears. Cam manufacturers agreed on a standard to measure duration so all cams are measured the same way.


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