Is the timing of the old Excelle 1.8 good for the camshaft? Is it an external image or an internal image?

The timing of the old Excelle 1.8 is the external character of the camshaft. And its design purpose is to ensure that the cylinder has enough air intake and exhaust. In addition, considering the durability and smoothness of the engine, the valve should not have too much impact during the opening and closing action because of the acceleration and deceleration process, otherwise it will cause serious valve wear, increased noise or other serious consequences. Therefore, the cam is directly related to the power, torque output and running smoothness of the engine.

Main advantages:

The common transmission modes between camshaft and crankshaft are gear transmission, chain transmission and toothed belt transmission. The transmission between the lower camshaft and the middle camshaft and the crankshaft mostly adopts cylindrical timing gear transmission.

Generally speaking, the transmission from crankshaft to camshaft only needs a pair of gears. If the diameter of the transmission gear is too large, 1 intermediate idler can be added. In order to mesh smoothly and reduce working noise, most timing gears adopt helical gears.