The smallest role of the valve is to locate the heat and reduce the resistance of the airflow, right

Valve interference angle: The angle between the cone of the valve head in contact with the valve seat insert and the plane of the valve top.

Function: Just as the conical plug can be tightened at the mouth of the bottle, it can obtain a large valve seat pressure to improve the sealing and thermal conductivity;

It has an automatic positioning effect when the valve is seated;

Avoid reducing the flow rate by turning the air flow too widely;

With the interference angle, the valve can squeeze out the deposits on the contact surface when it is seated, that is, it has a self-cleaning effect.

Effect. The smaller the valve interference angle, the larger the cross-section of the valve passage and the stronger the passing capacity. When the valve lift h is the same, h'2< h'1, that is, the larger the valve interference angle, the smaller the cross-section.

The larger the interference angle, the greater the sitting pressure, and the better the sealing and thermal conductivity. In addition, when the interference angle is large, the thickness of the valve head edge is large, and it is not easy to deform.

Intake valve interference angle: mainly in order to obtain a large channel cross-section, its own heat load is small, often use a smaller interference angle, more than 300, is conducive to improving the inflation efficiency.

The exhaust valve has a larger cone angle, usually 450, due to the high heat load, to enhance heat dissipation (about 75% of the valve heat is lost from the valve seat) and to avoid thermal deformation. There are also engines that use 450 for ease of manufacture and maintenance.

3) Valve head diameter.

The larger the diameter of the valve head, the larger the cross-section of the valve passage and the smaller the intake and exhaust resistance. Since the maximum size is limited by the structure of the combustion chamber, the intake valve diameter is larger than the exhaust valve, considering that the intake resistance is much more important than the exhaust resistance on the engine performance. In addition, the exhaust valve is slightly smaller, so it is not easy to deform.

Uh, I guess there's something wrong with him about this question, right?

Summary. Dear, that's right. By increasing the diameter of the rear exhaust valve of a multi-valve engine, the exhaust temperature can be reduced, thereby improving engine reliability.

Dear, that's right. By increasing the diameter of the rear exhaust valve of a multi-valve engine, the exhaust temperature can be reduced, thereby improving engine reliability.

Increasing the diameter of the rear exhaust valve increases the reduction of exhaust resistance, allowing the exhaust gases to be discharged more quickly, thus reducing the exhaust temperature. A lower exhaust temperature reduces heat accumulation inside the engine, lowering the engine's operating temperature. In this way, the heating degree of the parts of the Fabiling motor is reduced, the wear and thermal fatigue of the parts are reduced, and the reliability and life of the engine are improved.

In order to improve the running-in performance of the valve and the valve seat insert, the working cone angle of the valve is generally larger than that of the seat insert.

In order to improve the running-in performance of the valve and the valve seat insert, the working cone angle of the valve is generally larger than that of the limb seat insert. This is because friction and wear occur between the valve and the valve seat insert during the working process of the internal combustion engine, and the wear can be reduced by increasing the working cone angle of the valve at a certain distance, and the service life of the valve and valve seat insert can be prolonged.

Valve clearance is the gap between the end of the valve stem and the rocker arm or tappet when the top dead center is compressed.

Valve clearance refers to the gap between the end of the valve stem and the rocker arm or tappet at the compression top dead center of the engine. During the operation of the engine, the valves need to be adjusted regularly to ensure the normal operation of the valves and the ability to detect the hidden reeds.