Car manufacturers list some engine parameters in their sales brochures and owner’s manuals. This is important information for the user, and above all for the potential buyer of this car, since far-reaching conclusions can be drawn from these seemingly uninteresting figures. You can learn more about car power and torque on the website at hptorque.net.
Engine size is well known to all car users. This information can be found in sales brochures and vehicle manuals. As one of the characteristic data of the engine, it is entered in the vehicle registration certificate.
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Displacement is a geometric quantity. This is the volume of the cylinder in which the engine piston moves. The volume of a cylinder is the product of the cross-sectional area of the cylinder and the stroke of the piston. For a multi-cylinder power unit, the displacement is the sum of the volumes of the individual cylinders. The catalogs most often indicate the volume of cylinders in cubic centimeters.
However, in design practice, the power, or rather the piston stroke and its diameter, is determined from calculations in which a specific engine power is taken into account, taking into account the dimensional dependencies corresponding to a given group of engines. In all engines used to drive vehicles, the ratio of piston stroke to cylinder diameter and the ratio of crank radius to connecting rod length are important. The first quotient determines the height and length of the engine, its mass and the average piston speed. It is important to note that in practice, by reducing the piston stroke while maintaining a constant cylinder diameter, a decrease in the average piston speed is achieved. The lower speed of the piston in the cylinder has a positive effect on the increase in the duration of the engine repair periods. Larger cylinder diameter allows better valve seat placement. The ratio of piston stroke to cylinder diameter is in the range of 0.85 — 1.00.
Torque
The second important information characterizing the engine is the value of the maximum torque that the drive unit can develop. This is a measure of the vehicle’s potential for acceleration and agility. The torque value changes depending on the speed of rotation of the crankshaft. As the engine speed increases, the torque increases, but only up to a certain limit, then, despite the increase in speed, the torque value decreases. In operation, it is important that relatively high torque is maintained over a wide range of engine speeds, which makes the engine flexible as it provides a smooth ride without frequent gear changes. The torque of internal combustion engines is measured in laboratory conditions with Photo BMW: In an engine, the ratio of piston stroke to cylinder diameter is important. Shortening the piston stroke while maintaining a constant cylinder diameter leads to a decrease in the average piston speed and thus increases the engine overhaul intervals. Special devices called brakes. Its value is given in newton meters (Nm). The torque values obtained by passenger car engines range from 47 to 700 Nm and depend on the power, displacement and other design features of the engine.
