What's the difference between single overhead camshaft and double overhead camshaft?

Overhead double camshaft and overhead single camshaft. If the two original engines are compared together, the overhead single camshaft is absolutely dominant in any aspect, but if you want to madly modify the high slag conversion horsepower, the overhead single camshaft does not need to be compared. In addition, from the time of invention, the two are in the same period. From the name, it seems that two camshafts are more advanced, but the overhead double camshaft technology is complicated and the maintenance cost is high. You may not notice that the overhead single camshaft has an advantage in this respect. \ x0d \ x0d \ Automobile engines are divided into single overhead camshaft and double overhead camshafts according to the number of overhead camshafts. When more than two valves are used in each cylinder, there are generally two valve arrangements: one is that the intake valve and the exhaust valve are mixed on one camshaft, that is, the overhead single camshaft, and the other is that the intake valve and the exhaust valve are arranged on two camshafts respectively. All the valves in the former are driven by a camshaft through the ejector pin, but because of the different positions of the valves in the intake port, the accuracy of the action cannot be maintained, and the effect is slightly worse. The latter does not have this shortcoming and can obtain better performance, but it needs to be equipped with an additional camshaft, that is, overhead double camshafts. This form is mostly adopted by new engines introduced in recent years. Generally speaking, the overhead single camshaft has high maneuverability, and F 1 racing cars are widely used, but the manufacturing process is complicated and the cost is high. The relative configuration of overhead double camshafts is relatively simple and durable, which can meet the power requirements of general customers and their economic requirements. \x0d\ Advantages of single camshaft: \x0d\ Single camshaft has simple mechanical structure, few problems and large low-speed torque. The opening time of the intake valve and exhaust valve of a single camshaft is fixed, but the advantages of simple mechanical structure, convenient maintenance, economy and fuel saving are all single convex. \x0d\ Advantages of dual camshafts: \x0d\ Because the valve overlap angle can be changed, it can exert relatively large horsepower, but the torque is insufficient at low speed, and it will be difficult to maintain because of the complicated mechanical structure. The technology of double camshaft comes from racing car, which can mainly control the time difference between intake valve and exhaust valve. \x0d\ Uniconvex and biconvex are not good or bad, but have different structures.