The volume ratio of the garbage truck engine mainly affects the power output of the garbage truck engine. The higher the volumetric efficiency, the greater the power output of the engine.
In order to increase the volume ratio, all major automobile manufacturers in the world have made every effort to devote a lot of effort and financial resources to this research. Therefore, the invention of a multi-valve engine, variable valve technology, intake manifold thickening, DOHC (double overhead camshaft), and attachment machinery and turbocharger are all aimed at improving the volumetric efficiency of the engine.
In order to increase the volumetric efficiency of the engine, several special designs are derived from the intake and exhaust systems. Therefore, in a four-cylinder engine with the same displacement, the performance of the 16-valve over the 8-valve engine is better at high speed, and the 8-valve engine is published at low speed. Easily, both designs have their advantages. However, neither of them can guarantee excellent performance at low, medium and high speeds. This is mainly due to the fact that the valve timing and clearance are fixed, and the intake air speed changes with the change of the engine speed and cannot always maintain an ideal state. Various forms of variable valve technology have been invented to solve this problem. They can flexibly adjust throttle timing or clearance to increase the volumetric efficiency of the engine.
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