When the mass distribution is close to the axis of rotation, it has a low polar moment of inertia. Usually the injector is mounted on the air intake manifold close to the port. Port fuel injection improves fuel distribution and allows greater flexibility in intake-manifold design, which can contribute to improved engine breathing. The unit of measurement for torque . Power The rate at which work is performed.
Power is proportional to torque and rpm and is measured in horsepower.
The subjectively defined rpm range over which an engine delivers a substantial fraction of its peak power. The power band usually extends from slightly below the engine's torque peak to slightly above its power peak. Powertrain An engine and transmission combination. Profile The aspect ratio of a tire. A spring with an increasing spring constant.