Maximum speed of the diesel engine
Former owners of petrol cars are often asked about the periodic spinning and / or continuous operation of a diesel engine at certain speeds.. It should be noted, that the concept of maximum speed on diesel and the so-called low speed of diesel engines are very different in relation to a particular power unit.
Each ICE model has its own individual characteristics, which are expressed in terms of power and torque. It is also necessary to take into account the design features of an engine, determining the maximum allowable speed of the diesel engine. The optimal driving modes on a specific motor will directly depend on the torque and power curve..
We also recommend reading the article about it, what are the differences between diesel engine oil and gasoline engine lubricant. In this article you will learn about the features of the diesel engine and some requirements for engine oil for units of this type.
For a powerful turbodiesel engine, which is placed on heavy trucks, normal operation is approx 1800 rpm. The small diesel on the car provides confident thrust in the range 2200-2500 rpm. Quite obviously, that the maximum speed on these motors will be different.
Speed on diesel and gasoline internal combustion engines
Diesel engines differ from gasoline structurally, have a higher degree of compression and efficiency. The main difference of the diesel is the higher torque at low speeds, although the specific power of diesel is inferior to units on gasoline.
In other words, if it is necessary to move a large mass, having received at the same time good draft, diesel torque is an advantage. If the main task is to achieve maximum speed, which will require more power at maximum speed, then it is the element of gasoline engines.
It turns out, diesel engine needs to spin much less to ensure maximum torque compared to gasoline power plants. Due to this feature, diesel engines were originally put on the machine, for which high speed was not the main criterion.
The gradual development of technology and the desire of engineers to bring diesel on a number of indicators to the gasoline engine have led to, that the power of diesel units has increased significantly. To significantly increase power and torque while maintaining fuel economy, designers have implemented many solutions in the device of the diesel engine:
- The fuel supply system received direct injection of diesel fuel into the combustion chamber, the working chamber itself is located at the bottom of the piston;
- Pre-injection mode has appeared (post injection) to reduce shock loads and increase the combustion efficiency of the fuel-air mixture in the cylinders. Diesel began to work much less hard.
- Another step was to improve gas distribution mechanisms, valves per cylinder became more.
- Installation of the turbine on the diesel engine also provided essential increase in specific power and a twisting moment.. One of the newest developments is considered to be a turbine with variable geometry, in which the turbine blades can interact much more efficiently with the flow of exhaust gases.
We also recommend reading the article on ways to increase the power of a diesel engine with a tuning box. From this article you will be able to learn about it, why this solution is better than chip tuning.
As a result of structural improvements, diesel internal combustion engines have become high-speed, close to the analogues of gasoline. However, you need to take into account that, that the maximum speed of the diesel is still less compared to the internal combustion engine on gasoline. Modern diesel with a common rail system can be untwisted on average up to 4500-4800 thousand. rpm, while petrol units on cars can withstand close 7 thousand. rpm.
The power of the gasoline engine increases gradually and reaches a peak at high speeds. Diesel reaches maximum power much earlier, but after reaching the middle (in relation to the petrol internal combustion engine) the thrust of the diesel engine noticeably weakens.
Optimal speed range
It is for the above reasons that diesel engines have a narrow speed range. Diesel speed is tied to peak torque and folds 1800-2800 rpm, and the power drops sharply after 3800-4000 rpm.
These features make it necessary to adjust the style of driving a diesel. They, which for gasoline means driving hard, which occurs when too early to engage high gear, для простого дизеля є оборотами максимального крутного моменту.
As for more agile turbodiesels, it is better to keep the tachometer arrow in the operating speed zone and switch gears earlier.
There is no need to turn the diesel to maximum speed, as after leaving for "instantaneous turns" there will be no further confident increase in draft. Moreover, high diesel speeds lead to increased wear of LPG, overconsumption of gasoline and diesel engine oil.
