How to Distinguish Between a Pushrod Engine and a Chain-Driven Engine in Motorcycles?
2 Answers
Pushrod engines and chain-driven engines differ only in the structure of their valve trains, and there is no inherent relationship between them in terms of torque. The differences between them mainly lie in the following two aspects: 1. Structurally, chain-driven engines are more advanced. A chain-driven engine can increase RPM and boost power output for the same displacement. It is compact, lightweight, has lower mechanical load, precise ignition timing, and can be integrated with many advanced technologies. 2. In terms of manufacturing technology, pushrod engines offer better quality. Pushrod engines have a simpler structure, making them easier to maintain. Typically, domestically produced pushrod engines have fewer issues compared to chain-driven engines.
Distinguishing between pushrod and chain-driven motorcycles, as an experienced rider, I find the easiest way is to observe their appearance and sound. Look at the top of the engine: if you can see small rods moving back and forth near the valve cover, it's likely a pushrod engine, commonly found in older models like some Honda CG series; if there are no visibly moving parts and the cover is a solid piece, it's probably a chain-driven engine with the camshaft hidden inside. Sound-wise, pushrod engines roar loudly with significant vibration, especially at idle; chain-driven engines are much smoother, producing quieter and more stable sounds, offering a comfortable ride. I remember riding a pushrod bike in my youth—starting it always made my hands tingle—but the smoothness of a chain-driven new bike feels like silk. This distinction is crucial for maintenance: pushrod engines are simpler and cheaper to repair, while chain-driven ones are more expensive but offer greater durability.
