Choosing a camshaft is among the most crucial decisions when designing or improving your engine. The cam shaft is frequently described as”the “heart” of an engine which determines the distance and how long the valves remain open. Many other components, such as valve springs, cylinder heads, and torque converter, have been chosen according to the specifications of the cam shaft. Research and planning in advance around the camshaft can result in the most efficient engine performance.
Before buying a camshaft, it is crucial to understand the mechanism behind it and how modifications to its design affect its performance. Here are some terms and explanations to assist you in finding the most effective camshaft.
You must be aware of several ways that the camshaft lift is discussed. Cam lobe lift, sometimes known as Gross Lift, is the distance the cam moves a lifting device or tappet. Since the rocker arm can increase the motion of the tappet valve lift, it isn’t identical to the cam lift. For example, a cam with a lobe height of .4 inches can move the valve .6 inches, assuming a 1.5:1 rocker arm proportion (1.5 1 .4). A rocker arm with a different ratio will alter the lift of the valve; however, it will not affect the cam’s lobe lift. It is possible to increase valve lift by increasing the rocker arm’s ratio. The higher the cam lift, the valve will be opened further. A higher lift on the cam will permit more exhaust or air to pass through the engine. If you’re planning on upgrading your cam to increase lift, make certain that your valve springs can handle an increased lift cam. Piston clearance to the valve can be an issue. Check to see if you have sufficient clearance before you purchase an entirely new cam.
Camshaft Duration measures the period from when a valve opens until it closes. The duration is expressed in the degree of crankshaft rotation, not camshaft movement. There are duration specifications of .050 inches. The manufacturers of cams agreed to an established standard for measuring duration so that all cams are measured similarly. The goal is to determine the duration beginning at .050 inches for tapping (lifter) move. When the lobe lifts the tappet upwards, and whenever the tappet moves .050 inches, the duration is calculated from this place.
Camshaft lobes on V8s that are standard, similar to the smaller block Chevy are set up in pairs: one intake lobe and one exhaust lobe. These lobes are phased about one another. The cam lobe separation is the angle between the highest lift and the maximum lift of two cam lobes. To better visualize the cam lobes’ separation, look at the top of a typical camshaft V8. Draw a line across the middle of the cam towards the maximal lift for each cam lobe of two lobes. It is common to find this measurement between the 104-115 degree range. It’s crucial to know that Lobe Separation describes how the intake valve functions about the exit valve within the exact cylinder. Cam lift and duration define each lobe’s effect on the valve..
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