Engine Displacement Calculator
Engine displacement is the total volume swept by all pistons in one complete engine cycle. A Honda Civic's 2.0L engine has an 87.5mm bore, 83.1mm stroke, and 4 cylinders, giving exactly 1,998 cc. A classic Chevy 350 small block has a 4.00" bore, 3.48" stroke, and 8 cylinders for 350 cubic inches (5,733 cc).
The displacement formula is:
V = (pi/4) * bore2 * stroke * number of cylinders
This calculates the total swept volume, which is the volume displaced as all pistons move from bottom dead center (BDC) to top dead center (TDC).
**Bore/Stroke Ratio:** - **Oversquare (ratio > 1):** Bore is larger than stroke. Allows larger valves and higher RPM. Common in performance engines (Ferrari, Honda VTEC). - **Square (ratio = 1):** Bore equals stroke. Balanced characteristics. - **Undersquare (ratio < 1):** Stroke is longer than bore. Produces more torque at lower RPM. Common in diesel and truck engines. **Common Engine Examples:** - **Toyota 2JZ-GTE:** 86mm bore, 86mm stroke, 6 cyl = 2,997 cc (3.0L, square) - **Ford 5.0 Coyote:** 92.2mm bore, 92.7mm stroke, 8 cyl = 4,951 cc - **Chevy LS3:** 103.25mm bore, 92mm stroke, 8 cyl = 6,162 cc (376 cu in) - **Ducati Panigale V4:** 81mm bore, 53.5mm stroke, 4 cyl = 1,103 ccIn the US, muscle car engines are traditionally measured in cubic inches (CI), while metric countries and motorcycles use cc or liters. Modern car marketing typically rounds to the nearest half-liter or whole liter (a "2.0L" might actually be 1,998 cc).