Engine speed and speed: how to save fuel and not "kill" the engine
Let's start with that, that many drivers often face, when fuel consumption during operation of the car is markedly different from those data, which are declared by the manufacturer. To be precise, the engine is fully functional, however, in terms of fuel "appetite" of a particular engine is significantly more, than on the passport.
Quite obviously, that owners are starting to think about saving. Usually, the easiest way out of the situation is to install HBO. At the same time few people take into account, that driving style greatly affects both the consumption of gasoline or diesel fuel, and gas consumption.
Let's add, that around different tricks and ways, which help save fuel while driving, there is a lot of controversy. Some drivers believe, that at the first-best opportunity it is necessary to move on a neutral transfer "nakatom", others always try to engage a higher gear as early as possible and regardless of the speed of the car, others monitor the speed, not allowing the arrow on the tachometer to rise above any certain threshold, etc..
Next we'll talk about that, what is the relationship between engine speed and speed, at what speed and on what transfer it is possible to go with the maximum fuel economy, as well as which modes can be considered the most gentle for the engine itself.
Speed and speed: fuel economy and engine life
so, you can often hear from drivers, that as soon as the car is driven to 60 km / h, can be included, example, 5 transmission (if the checkpoint is 5-speed). In this case, the speed will fall to 1900-2000 thousand. About / minutes and in this mode, fuel consumption will be minimal. In other words, the most economical option is riding, when top gear is engaged and speed is low.
If you study a little theoretical part, Acceleration to a certain speed requires energy. The more intense the acceleration, the more energy is expended. After reaching a constant speed (cruising) fuel consumption becomes lower, however, it must be taken into account, that the car also overcomes air resistance.
Without going into mathematical calculations, increase speed, example, with 50 km / year before 100 km / h will mean, that air resistance does not increase 2 times, as many might think, and in whole 8 times. That is, to maintain the speed gained, need to spend in 8 times more energy. It is to overcome air resistance that engine power is expended.
It turns out, to keep the speed close 50 km / year, need close 30-35 c.c., whereas when overclocking to 120-130 km / h to overcome the resistance to air currents is needed 80-90 "Horse". To this you need to add the weight of the car itself, which is different for each vehicle, make adjustments to road conditions, etc..
You still need to keep that in mind, that reciprocating internal combustion engines show the best efficiency in the zone of maximum torque, rather than maximum speed. In parallel, it should be taken into account, that gearboxes are also different, have different gear ratios.
It becomes clear, that the most economical mode is really achieved then, when the car is moving in higher gear at low speed, however, the optimal speed on such a transmission for each car will be different.
Another important point is, let's say so, the feasibility of saving fuel in this way. In the manual, many car manufacturers indicate separately, that the highest gears need to go to no 50, and on 80 or even 100 km / h. The point is, that the less engine speed, the more the cost drops, however, such driving at low revs and in high gears can damage the engine.
Example, engine with displacement 2.0 liters on a car weighing about 2 tons, which is moving in high gear at a speed of about 60 km year, will run at low speeds. The load on the motor will be very large. The point is, that the oil pressure at low speeds is also low, that is, the wear of parts and components of the power unit is maximum.
To reduce the load, need to either add speed and increase speed, or shift to a lower gear. If the car with the same engine will have weight, example, 1.3 tons, the load on the engine will be less, than in the case of a two-ton car, however, accelerated engine wear will still be present.
If you summarize the information received, then it becomes clear, that the less revs and higher gears, the less fuel consumption. At the same time driving at low speeds "kills" the engine. It turns out quite dubious fuel savings, which in the future does not cover the cost of repairing the motor.
How to achieve fuel economy without damaging the engine
First of all, need to be determined, at what speed in each gear the engine speed on a particular vehicle falls below 1800-2000 about / min. Usually, for most motors 1.8-2 thousand. Turnover is the "minimum", when the pressure in the lubrication system is already sufficient, to avoid excessive wear.
Others, road conditions must be taken into account. Example, the car is moving at speed 60 km / year on 5 transmission on a level road, however, the rise begins. The driver may or may not press harder on the gas, to maintain the speed gained, or shift to a lower gear.
So here it is, in the first case, the load on the engine will be very large, and there is a risk of detonation. At the same time there are no fuel savings, as it is necessary to press harder on gas, to maintain the speed gained. It turns out, gasoline in the cylinders burns more intensely, and traction on the increased transfer is not present, at the same time the car with great difficulty overcomes the rise.
If you study the basic recommendations of experts, about that, what revolutions, speed, Transmissions and other factors affect fuel consumption and engine life, then for gasoline engines you can select the following:
- it is highly undesirable to constantly drive at lower speeds 2000 thousand .;
- it is necessary to select the transmission according to road conditions;
- the movement in the highest gear should take place at the optimum speed;
As for diesel engines, optimal speed, speed and choice of transmission will be different from gasoline counterparts. For this reason, the subtleties and features of economic driving on a diesel engine should be studied separately.
It should also be noted, that to save fuel it is very important to learn to maintain inertia. In practice, this means, that you should not use the brakes unnecessarily, be able to apply engine braking, switch gears in a timely manner, passing turns with the minimum loss of earlier gained speed, etc..
We also recommend reading the article about it, at what engine speed it is better to go. In this article you will learn about it, what engine speeds can be considered optimal in the daily operation of the car.
pay attention, such a ride requires an understanding of all processes, occurring, that is, an inexperienced driver first needs some training (emergency driving), only then can the acquired knowledge be applied in practice!
Let's summarize
As you can see, smooth driving without sharp accelerations and braking, rolling motion selection and maintenance of the optimum gained speed due to inertia, as well as a number of other techniques can achieve significant fuel savings without damaging the engine. It is important to be able to choose the right gear for a particular speed, while keeping the speed in the desired range.
The main thing, while driving in time to go to the reduced, preventing detonation. This will avoid serious engine problems and expensive repairs. If the car does not have a tachometer, the speed must be monitored for the sound of the engine, as well as focus on vibration, pickup of the unit on this or that transfer depending on speed of movement, take into account road conditions.We also recommend reading the article about it, why "fingers are knocking" during acceleration. In this article you will learn about the main causes of finger tapping and the appearance of similar extraneous sounds during acceleration of the car.
Finally, note, that the optimum speed for maximum fuel economy at high gear on different machines will vary. It all depends on the engine capacity, car weight, etc.. Also, don't forget, that fuel consumption is strongly influenced by the condition of the spark plugs, oil and fuel filters, cooling system efficiency, etc..
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