iskutilavuudet

Iskutilavuudet is Finnish for the total swept volume of an internal combustion engine, usually referred to as engine displacement. It is a fundamental specification that describes the size of the engine and is typically expressed in cubic centimeters (cc) or liters (L). The term can describe a single engine or, in plural form, multiple engines or models.

The total iskutilavuus is the sum of the displacement of all cylinders. For a single cylinder, displacement equals π × (bore/2)^2 × stroke, where bore is the cylinder diameter and stroke is the distance the piston travels. For engines with multiple cylinders, the total iskutilavuus is the displacement per cylinder multiplied by the number of cylinders.

Iskutilavuudet are an indicator of an engine’s size and potential output. In general, a larger displacement allows more air–fuel mixture to be combusted per cycle, which can lead to greater torque and horsepower. However, actual performance also depends on design and technology such as turbocharging, direct injection, and hybrid systems, which can enhance power without a proportional increase in displacement.

In practice, iskutilavuudet are used in vehicle specifications, reviews, and regulatory contexts to classify engines, estimate fuel consumption, and, in some regions, influence tax or insurance decisions. They apply to gasoline, diesel, and alternative-fuel engines across cars, motorcycles, boats, and other machinery.

Etymology: iskutilavuus combines iskku (stroke) and tilavuus (volume or displacement) in Finnish.