What is the composition of the valve group?

[Tony]

The valve group generally consists of components such as the valve, valve seat, valve guide, valve spring, valve spring seat, and valve lock (lock pin). The following is an introduction to the valve: Function: The function of the valve is to specifically input air into the engine and expel the exhaust gases after combustion. Structurally, the engine is divided into intake valves and exhaust valves. The intake valve is responsible for drawing air into the engine to mix with fuel for combustion; the exhaust valve is responsible for expelling the exhaust gases and dissipating heat. Working Conditions: The working conditions of the valve are extremely harsh. First, the valve is in direct contact with high-temperature combustion gases, suffering severe heating and difficulty in heat dissipation, resulting in very high valve temperatures. Second, the valve is subjected to gas forces and valve spring forces, as well as impacts when the valve seats due to the inertia of the valve train components. Third, the valve opens and closes at extremely high speeds and moves at high speeds within the valve guide under poor lubrication conditions.

[RyderRose]

The valve train plays a crucial role in the engine, primarily consisting of intake and exhaust valves, which act as opening and closing portals for air and exhaust gases to enter and exit the cylinders. The valve spring is responsible for returning the valve to its closed position, ensuring precise control during each combustion cycle. The valve guide supports the up-and-down motion of the valve stem, reducing friction and wear while preventing oil from entering the combustion chamber. The valve seat, located on the cylinder head, ensures a tight seal when the valve is closed, preventing power loss due to leaks. Additionally, the valve rocker arm or pushrod connects to the camshaft, converting the cam's rotation into the opening and closing motion of the valves. These components work together to ensure smooth engine intake and exhaust, impacting overall power and efficiency. I've seen many older car engines lose power due to valve carbon buildup or spring wear, making regular cleaning and maintenance of these parts essential. Especially after high-temperature or high-load driving, checking valve clearance and spring tension can prevent unexpected failures.

[AnthonyFitz]

From an owner's perspective, the valve train includes the valves themselves, the spring system, valve guides and seats, as well as the rocker arm mechanism. I enjoy maintaining my own car and have found that when the valve train is damaged, the engine may shake weakly or have difficulty starting. Worn-out springs can prevent valves from closing tightly, leading to incomplete combustion and increased fuel consumption. Worn guides cause oil leakage, affecting engine lifespan. Based on daily experience, I recommend inspections every three years, especially for frequent city driving which tends to cause carbon buildup. Removing the air filter to clean certain areas can be helpful. Untreated valve issues may lead to stalling on highways, which is extremely dangerous. Therefore, learning basic detection methods such as listening for abnormal engine noises or dashboard warnings, and timely repairs can save significant costs.

[RicardoRose]

The composition of the valve train historically reflects engine evolution, from early simple components to modern high-efficiency designs. Core elements include valves, springs, guides, and rocker arms. Valves control gas flow, springs maintain opening and closing tension, and guides ensure smooth sliding. Older engines like side-valve designs were inefficient, while later overhead valve systems such as OHC reduced pushrod components to improve reliability. Modern vehicles often use DOHC (dual overhead cam) systems, simplifying structure and increasing RPM limits. These changes have made valve trains quieter and more durable. Comparing old and new car performance, I clearly noticed optimized fuel consumption and enhanced power. Studying valve trains helps understand engine principles and drives automotive technology forward.

[VonAlyssa]

The valve assembly is crucial for safety, and if components such as valves, spring retainers, and rocker arms fail, the engine may suddenly stall. Once while driving, I experienced engine shaking, and upon inspection, found poor valve sealing, which caused pressure imbalance and nearly led to an accident. A broken spring can damage the cylinder, while worn guides allow oil to leak into the combustion chamber, increasing the risk of knocking. Especially in extremely cold regions, valves may freeze and fail to close, resulting in an inability to start. The coordinated operation of these core components ensures smooth power output, so drivers are advised to pay attention to unusual noises or changes in exhaust color. Regular lubrication of the system reduces wear and prevents failures. If issues arise on the road, pull over immediately and seek assistance.

[HadleyLee]

As an automotive enthusiast, I've explored valve trains for years, which consist of valve bodies, spring retainers, guide sleeves, and rocker arm linkages. During DIY maintenance, first use tools to measure the clearance - too loose or too tight affects sealing. Carbon buildup on valves can easily cause backfire and increase fuel consumption. I enjoy observing the engine's rhythmic operation, ensuring the camshaft synchronizes smoothly with the rocker arm movements. Beginners should proceed with caution to avoid damaging valve seats through improper adjustments. Learning basic principles like carbon cleaning can enhance performance, and I recommend referring to online tutorials for step-by-step guidance.