Displacement, power, torque, liter power, the meaning of these engine specifications, many people are confused. When buying a car, most people only look at the displacement and horsepower, in fact, the average consumer only look at these two parameters to buy a car, basically no problem.
1.Displacement
Displacement is the basis of the first is the engine displacement, generally use “L” as a unit, on behalf of the engine all the cylinder volume together with the size of the cylinder volume, the larger the cylinder volume, which means that a time can inhale more mixture, combustion work can produce more energy, the larger the cylinder volume, the more the amount of mixture of a single combustion, the enhancement of the way to increase the cylinder bore or increase the number of cylinders. Including increasing the cylinder bore or increase the number of cylinders, the displacement of modern mainstream models is concentrated in the 1.5L-2.0L range, with the emissions policy continues to tighten, large-displacement engines have become less and less, most manufacturers still hope to ensure that the displacement of the premise of unchanged, to enhance the engine's output power, there are turbocharging, variable valve timing, dual injection, dual-cycle a variety of technologies. Now 1.6T engine, has been equivalent to 2.5L self-priming engine, BMW 3 series of 2.0T can be divided into three kinds of power version, the difference between the lowest and highest version of more than 100Ps, so just look at the displacement can not truly judge the power performance of a car.
2. Power and torque
Power is a physical quantity that describes the speed of work, the power of the engine is to indicate the engine, how much work is done in a unit of time. Maximum power refers to the peak power of the engine in the limit state, generally appear in the car's maximum speed. Want to understand the relationship between power and torque, we can imagine the torque as a cylinder breath inhaled by the amount of fuel and gas, this amount of inhalation will be increased with the throttle opening and the speed of the gradual increase.
But the torque can not always increase, when the throttle opening in place, the speed reaches a certain value, it can not continue to increase, which is often referred to as the maximum torque. When the rpm continues to rise, the torque will instead decay, you can understand that before reaching the maximum torque, the car will accelerate quickly, but once the maximum torque is exceeded, the acceleration performance will decline, this is the characteristic of the internal combustion engine torque, but also the most imperfect place.
Power is equal to RPM multiplied by torque, which can be imagined as the amount of fuel and gas that can be inhaled by the engine per unit of time, so as the engine RPM gradually increases and slowly reaches maximum torque, the amount of air intake per unit of time is also gradually increasing. When the speed exceeds the maximum torque range, although the torque is decreasing, but the increase in speed, can still improve the amount of suction, so the car's speed can continue to increase, but rely on the torque to achieve the ability to accelerate is weakening. This is what many people say: power determines maximum speed and torque determines acceleration.
Liters of power can be a good reflection of the advanced nature of an engine, there is no good technology, just rely on a pile of cylinders to enhance horsepower, is not difficult, but in the case of a fixed displacement, think of every way to enhance the efficiency of each cylinder to do the work, it is the hard power. engine specifications are numerous, and you need to pay extra attention to the important parameters when you buy the relevant products. I hope this article is helpful to you.
