What is the function of the valve spring?

[DiMaci]

The function of the valve spring is to overcome the inertial force of the valve and its transmission components during the valve closing process. Below is an introduction to valve springs: 1. Purpose: To prevent gaps between transmission components caused by inertial forces, ensuring the valve promptly seats and tightly fits, preventing valve bouncing during engine vibration which could compromise its sealing. 2. Tool Introduction: The valve spring is located between the cylinder head and the spring seat at the end of the valve stem. Its function is to ensure the valve tightly fits against the valve seat or valve seat ring when closed, and to overcome the inertial force generated by the valve train during valve opening, keeping the transmission components always under cam control without disengaging from each other.

[DelAriana]

I've repaired quite a few cars, and don't underestimate the valve spring despite its small size—it plays a crucial role. Its main job is to ensure that the engine's valves close quickly and tightly after opening. Think about it: when the engine is running, the camshaft pushes the valves open, but without something pulling them back, the valves would stay open, allowing the burning air-fuel mixture in the combustion chamber to leak out and go to waste, leaving the car sluggish and weak. This spring acts like a boomerang, pressing against the valve stem to maintain a tight seal and ensure complete fuel combustion. I've seen cases where fellow car enthusiasts had aged or broken valve springs—the engine noise was deafening, fuel consumption skyrocketed, and repairs were quite a hassle. Regular maintenance is key, as these springs are prone to fatigue under high temperatures. If they fail, it's no small matter.

[IsabelleDella]

The valve spring is a crucial supporting component in the engine's valve train. When the camshaft pushes the valve open, the spring compresses and stores energy; once the camshaft releases, the spring immediately rebounds to close the valve. This ensures the combustion chamber remains sealed—without it, the engine would leak air, suffer from insufficient compression, and lose significant power. It's also worth noting that the spring prevents valve float, especially at high RPMs, by keeping the valve firmly in place. If the spring weakens or breaks, the consequences range from rough idling and increased fuel consumption to severe engine damage if the valve collides with the piston. When replacing the spring, always inspect related components to avoid repeated repairs.

[DaniellaLynn]

Simply put, the valve spring does one thing: ensures the valve closes on time. The camshaft makes it open, and it obediently snaps back into place. Without this force, the combustion chamber can't seal, fuel mixture fails, and the car will struggle to breathe. I once encountered an old car with worn-out springs—the engine speed fluctuated erratically, making driving feel utterly uncomfortable.