High-angle camshaft installation method

The camshaft is an important component that pushes the valve to perform the intake and exhaust operations driven by the output shaft of the crankshaft. When the crankshaft of the four-stroke engine rotates 720 degrees, it completes four cycles of intake, compression, combustion, and exhaust, and the camshaft is The crankshaft drive accurately opens and closes the valve. This process is called valve timing.

The so-called high-angle camshaft means that the working angle of the camshaft is larger than the original one, that is, the opening time of the valve is prolonged, and the intake and exhaust flow is increased to increase the power output. High-angle camshafts are mainly divided into large-angle camshafts that only increase the working angle. When the working angle of the camshaft exceeds 280 degrees, it can be called a high-angle camshaft. The high-angle camshaft not only has a large working angle, but also has a high head. It will increase the valve overlap angle, valve leakage rate at low speed, high speed, abnormal instability, but also because of the lower vacuum level to make the brake master cylinder booster help weakened, the original trip computer to receive data shift, low speed Fatigue, high speed power increase.

The installation of high-angle camshafts is not complicated. Simply remove the original camshaft and replace the high-angle camshaft. Although this is done, it is better to make a balance before installation to ensure smooth rotation at high speed for safety reasons. Because the valve stroke has increased, so I suggest replacing the original valve and valve spring with high strength. In order to prevent the original valve from being able to withstand high-strength working conditions and break, the final result is only one, that is the explosion cylinder.

When the high-angle camshaft is replaced, the air in the cylinder is generally not fully saturated during the opening and closing of the valve. Therefore, when installing the high-angle camshaft, it is best to ask the professional technician to adjust the intake valve to open early. The exhaust valve closes later, allowing more air to enter the cylinder. The effect of this is that before the exhaust valve is closed and the intake valve is opened, more fresh air can be introduced into the cylinder and the exhaust gas that has not been completely discharged is squeezed, so that the air flow efficiency in the cylinder can be improved. If this type of fabrication is not carried out, the “valve overlap” phenomenon in professional jargon is likely to occur. When this happens, it means that the leakage rate of the valve at low engine speed will increase, the low torque will become weak, and the idle speed will also be unstable.

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