Increasing the number of cylinders in an engine generally affects smoothness in what way?

• A. Higher fuel consumption
• B. Smoother running the engine
• C. More vibration
• D. Longer lifespans

Answer: (B)

Increasing the number of cylinders makes the engine’s firing events more evenly spaced, which smooths the torque delivery. In a four-stroke engine, each cylinder produces a power stroke once every two crankshaft revolutions. Adding more cylinders distributes those power pulses across the revolution, reducing peak torque fluctuations and the resulting vibrations. The engine thus runs more smoothly because the load on the crankshaft changes more gradually rather than in large, jagged jolts.

This is why the correct choice is smoother running. Higher fuel consumption isn’t the focus of smoothness, and more cylinders don’t inherently cause more vibration—in fact they reduce it. Lifespan depends on many factors beyond just cylinder count, and greater cylinder count is not a direct guarantee of longer life.