car modification knowledge in multi valve engine technology

 The multi-valve technology by improving the intake air, increasing the output power of the engine. 2-valve engine intake limited cross-sectional area at high speed is likely to cause its intake is not smooth, multi-valve technology will be able to change this situation effectively.


 4 valve engine

    Traditional 2-valve engine can only occupy 1/3 of the area of ​​the top of the combustion chamber as the area of ​​the intake port, the intake efficiency is limited. When the 4-valve engine plot with respect to the 2-valve engine, the cross section of the intake air can be increased more than 50%, and more suitable for high speed running smoothly. Meanwhile, since the 4-valve design may be a spark plug can be disposed at the center of the combustion chamber, the flame of the spark plug can be more evenly distributed to the respective corners of the combustion chamber, the combustion of the mixture can burn more fully, the heat loss is small, so the 4 valve engine is also more conducive to improve combustion efficiency and reduce emissions.

    The 4-valve engine can be designed two camshafts to drive the valve, a driven intake valve, a drive exhaust valve, can be more accurately controlled, and may adopt more new technology. Now, most mainstream 4-valve engine with a double overhead camshaft design. Honda and Mitsubishi in its ordinary civilian car still prefer to use a single overhead camshaft for cost considerations. It needs to be arranged on the camshaft rocker, ultimately driven by rocker valve. This design can reduce costs, but increase the frictional resistance and movement inertia affect the power output when the high engine speed. Honda and Mitsubishi sports car for performance improvement considerations are equipped with a dual overhead camshaft design engine.
3 valve engine

    Early multi-valve engine in general using three valves, this is due to the technical structure of valve 3 is simple - the three valves may be arranged in a straight line, so only need a camshaft of a cylinder can be simultaneously driven into the and exhaust valves. Until now, still a small number of multi-valve engine with this low-cost design, for example, the old Mercedes-Benz V6 and V8 engines, KIA Maxima 1.3 liter engine. Of course, this low-cost design for improving the work efficiency of the engine is very limited.

    4 valve engine

    Traditional 2-valve engine can only occupy 1/3 of the area of ​​the top of the combustion chamber as the area of ​​the intake port, the intake efficiency is limited. When the 4-valve engine plot with respect to the 2-valve engine, the cross section of the intake air can be increased more than 50%, and more suitable for high speed running smoothly. Meanwhile, since the 4-valve design may be a spark plug can be disposed at the center of the combustion chamber, the flame of the spark plug can be more evenly distributed to the respective corners of the combustion chamber, the combustion of the mixture can burn more fully, the heat loss is small, so the 4 valve engine is also more conducive to improve combustion efficiency and reduce emissions