How to choose a camshaft
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==The valve train== | ==The valve train== | ||
| − | Mechanically speaking, the '''camshaft''' is linked to the crankshaft and turns 1/2 the speed of the crank. As the cam turns, the eccentric-shaped '''cam lobe''' lifts and lowers a cam follower, or '''lifter'''. The lifter is linked to a fulcrum, or '''rocker arm''' by a '''pushrod'''. The rocker arm directs the motion of the cam lobe to the '''valve''', lifting the valve open and closing it shut with the aid of the '''valve spring(s)'''. | + | Mechanically speaking, the '''camshaft''' is linked to the crankshaft and turns 1/2 the speed of the crank. As the cam turns, the eccentric-shaped '''cam lobe''' lifts and lowers a cam follower, or [http://www.crankshaftcoalition.com/wiki/Lifters '''lifter''']. The lifter is linked to a fulcrum, or [http://www.crankshaftcoalition.com/wiki/Rocker_arms '''rocker arm'''] by a [http://www.crankshaftcoalition.com/wiki/Pushrods '''pushrod''']. The rocker arm directs the motion of the cam lobe to the '''valve''', lifting the valve open and closing it shut with the aid of the '''valve spring(s)'''. |
The shape of the cam lobe dictate when the valve opens and closes in relation to crankshaft position (aka the '''cam timing'''), and how far the valve is opened (aka the '''valve lift'''), as well as how long the valve is open and closed (aka the '''duration'''). | The shape of the cam lobe dictate when the valve opens and closes in relation to crankshaft position (aka the '''cam timing'''), and how far the valve is opened (aka the '''valve lift'''), as well as how long the valve is open and closed (aka the '''duration'''). | ||
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