What Is Engine Displacement?
Engine displacement is the total volume swept by all pistons inside the cylinders during one complete engine cycle. It's one of the most fundamental engine specifications, directly related to power output and fuel consumption. Displacement is commonly expressed in liters (L), cubic centimeters (cc), or cubic inches (ci).
A larger displacement generally means more air-fuel mixture per cycle, producing more power. However, modern turbocharging allows smaller engines to produce power comparable to larger naturally aspirated engines.
Displacement Formula
Common Engine Displacements
| Engine | Bore × Stroke (in) | Cyl | Displacement |
|---|---|---|---|
| GM LS3 (6.2L) | 4.065 x 3.622 | 8 | 376 ci / 6.2L |
| Ford Coyote (5.0L) | 3.630 x 3.650 | 8 | 302 ci / 5.0L |
| Toyota 2JZ (3.0L) | 3.39 x 3.39 | 6 | 183 ci / 3.0L |
| Honda K20 (2.0L) | 3.39 x 3.39 | 4 | 122 ci / 2.0L |
| Chevy SBC 350 | 4.000 x 3.480 | 8 | 350 ci / 5.7L |
Frequently Asked Questions
What does bore and stroke mean?
Bore is the diameter of the cylinder. Stroke is the distance the piston travels up and down. A "oversquare" engine has a bore larger than stroke (high-revving), while an "undersquare" engine has stroke larger than bore (more torque).
How does displacement affect performance?
Larger displacement means more air-fuel mixture per cycle, which generally produces more torque. However, smaller turbocharged engines can match or exceed the power of larger naturally aspirated engines while being more fuel-efficient.
What is the bore/stroke ratio?
The bore/stroke ratio describes engine character. A ratio above 1.0 (oversquare) favors high RPM and horsepower. A ratio below 1.0 (undersquare) favors low-end torque. Equal bore and stroke (1.0) is called "square."