AGR 170 Agricultural Technology – Small Engine Mechanics Practice Exam

Creating more power without enlarging each cylinder means increasing the engine’s total displacement while keeping the bore and stroke of every cylinder the same. Adding more cylinders achieves this directly: with more cylinders, there are more combustion events per engine cycle, so the engine can burn more air and fuel overall. That extra combustion capacity translates into higher torque and horsepower, provided the fuel system, cooling, and exhaust can handle the increased flow and heat.

Other approaches change how much air or fuel can be processed per cylinder or how often a given cylinder fires, but they don’t increase the number of cylinders themselves. Extending stroke enlarges per-cylinder displacement, effectively increasing cylinder size. Increasing compression ratio boosts pressure inside the same cylinders but has limits and risks like knock. A turbocharger can boost power without changing cylinder size by forcing more air into the cylinders, but the main way to raise total engine output without altering cylinder dimensions is to add more cylinders to increase total displacement.