Rocker arms
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The rocker arm is a fulcrum. Its job is to turn the cam lobe's circular rotation into an up and down movement. This is able to be done because the rocker has a pivot point or fulcrum that allows the cam lobe to open the valve. | The rocker arm is a fulcrum. Its job is to turn the cam lobe's circular rotation into an up and down movement. This is able to be done because the rocker has a pivot point or fulcrum that allows the cam lobe to open the valve. | ||
| + | ==Rocker arm ratio== | ||
The rocker arm's pivot point is not in the center of the rocker; instead it is offset more towards the pushrod. The amount of offset is expressed as a ratio (1.5, 1.6, 1.7, etc.). | The rocker arm's pivot point is not in the center of the rocker; instead it is offset more towards the pushrod. The amount of offset is expressed as a ratio (1.5, 1.6, 1.7, etc.). | ||
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Changing the rocker ratio will also change the off-the-seat duration seen at the valve a small amount. However, seat-to-seat duration will not change. | Changing the rocker ratio will also change the off-the-seat duration seen at the valve a small amount. However, seat-to-seat duration will not change. | ||
| − | ==Types== | + | ==Types or rockers== |
There are several different materials rocker arms may be made of: hardened steel, stainless steel, aluminum- both extruded and cast. There are several different designs: pedestal mount, stud mount, shaft mount. There are different pivot point: Ball and stud (like a SBC), shaft, or a roller trunnion. There are different tips: Self aligning, non self aligning, roller (also in SA and non SA designs). | There are several different materials rocker arms may be made of: hardened steel, stainless steel, aluminum- both extruded and cast. There are several different designs: pedestal mount, stud mount, shaft mount. There are different pivot point: Ball and stud (like a SBC), shaft, or a roller trunnion. There are different tips: Self aligning, non self aligning, roller (also in SA and non SA designs). | ||
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