1250cc

1250cc refers to an engine displacement of 1,250 cubic centimeters, or about 1.25 liters. It describes the total volume swept by all pistons inside the cylinders during a full engine cycle. The displacement is calculated by adding the per-cylinder volume across all cylinders, with per-cylinder volume determined by the bore (cylinder diameter) and stroke (piston travel): displacement per cylinder = pi/4 × bore^2 × stroke, and total displacement = that value multiplied by the number of cylinders.

This displacement class is commonly found in motorcycles and some cars. Engines in the 1250cc range are often configured as inline fours, V-twins, parallel twins, or V fours, and they are used in sport, sport-touring, and high-performance applications. The 1.25-liter size is considered mid-to-high capacity, offering a balance of power, torque, and weight that appeals to riders seeking strong mid-range performance without the very largest engines.

Power and torque for 1250cc engines vary widely depending on design and induction. Naturally aspirated versions may produce roughly 90 to 170 horsepower, with torque commonly in the 90 to 125 Newton-meters range. Turbocharged variants can exceed these figures. However, engine displacement is only one factor in performance; compression ratio, fuel delivery, exhaust design, electronics, and gearing all influence actual output and efficiency.

In markets and classifications, engine size like 1250cc can affect licensing, taxation, and vehicle categorization in some jurisdictions, making displacement a common criterion in regulatory contexts as well as performance discussions.