How to increase engine power?
In order to reconstruct the engine of your car (of course - in order to improve the quality of work), you need to understand that this is a complex work, because the engine, as a human body, everything is interconnected. It is necessary to know for sure whether this or that change can be made. If so, how to do it? In the end, you need to have an idea of what we want to achieve in the end. In general, it is unlikely to do all this without knowledge of the basic engine workflows.
Most often they ask how to increase engine power, and this is logical, because power is the main characteristic of engine operation. Just always remember about the very interconnection of the processes in the engine: changes only in one node can lead to changes in the whole working process. And these changes will not always be positive: improving one can ruin the other.
Increase engine power: ways
Tuning the engine to increase its power can be done in two ways:
- increased crankshaft torque;
- moving the torque to the high rpm range without changing its value.
Now we will try to analyze step by step how to increase the power of the engine of vaz and other brands in the ways indicated above.
In general, the torque depends mainly on the volume of the engine and the pressure in the cylinder. What are the options in this case?
The main option is to increase the working volume of the engine, but within its capabilities, since it is possible to increase the engine power without creating problems only by focusing on the maximum design possibilities of the engine (without exceeding them). This option is most successful in terms of road cars, because you do not change the rev range, which means you do not have to get used to the new style of driving.
Let us turn to the working question: how to increase the volume? There are two ways: an increase in the diameter of the cylinder or the replacement of a standard calendar with a calendar with a large eccentricity. We will not go into details of how to increase engine power by replacing the calender, as in general, this method is less successful.In a nutshell: a calender with a greater eccentricity would require shorter connecting rods. The shorter the connecting rod, the greater the force needed to press the piston against the wall of the cylinder, as a result, the magnitude of the resistance of movement increases (while maintaining the friction coefficient). In general, we observe not only mechanical losses, but also a large load on the connecting rods, and in tuning it is not at all trivial. Therefore, we consider the second option.
To increase the volume of the cylinder by boring the cylinder under the pistons of larger diameter. The walls of the cylinders have a sufficient thickness (which ensures their strength). However, it is possible to sacrifice a millimeter or two (in the presence of a thickness of 7-8 mm) in order to obtain additional volume.
The design features of turbocharged engines are interesting from the point of view of tuning, since we can increase the engine power in this case without disassembling the engine (without touching the volume and torque curve). Here we get a greater moment, only slightly changing the amount of supercharging.
The boost pressure (both in turbines and in mechanical compressors) is determined by the number of engine revolutions: more revs — higher pressure.The control unit monitors the pressure, pitting too much, which means our goal is to change its characteristics. It is necessary to raise the bar only slightly, and the pressure will increase. However, there are certain limits of thermal and mechanical loads. That is, it is possible to increase the boost in some limits, however, if you want to get an even more powerful engine, this method will not do without additional tuning (installing an additional radiator, changing the cooling system, increasing the volume of the combustion chamber, intermediate air cooler, updating air intakes; besides, it may be necessary to replace the cast-iron crankshaft with steel ones and pick up pistons with greater strength). In general, this is not a simple matter.
Gas dynamic changes
The essence of this method is to increase the charge of the fuel-air mixture. In general, this method is only practical experiments. The process is the elimination of defects of the serial assembly (smoothing and aligning the inlet and exhaust channels, the elimination of sharp corners at the joints of parts and similar manipulations). Saying to the vsidku, where and how to do and what will be right, is virtually impossible.
Range of high revs
To understand how to increase engine power in this way, you need to understand what engine power is in general. And power is nothing more than the product of torque and engine speed. And here is a simple mathematics: shifting the standard characteristic of torque to the zone of high revolutions, we get more power. However, there are some disadvantages here.
In any gas distribution mechanism, cylinders are well filled only in their prescribed rev range. As a result of moving the torque to the zone of higher revolutions, we will lose it on bottoms; that is, now at low revs the cylinders will be badly purged. Bottom line: click on the gas - the car does not go; to get under way is also not an option - we will burn the clutch. And the arrow will have to keep at high speeds. In general, for an ordinary car the option is not the best, usually this method is used in the case of sports cars for relevant purposes. Therefore, serial engines have a reasonable range of revolutions within 2-3 thousand.
Of course, there are advanced engines, where the timing is automatically changed, which allows you to avoid such dips at the bottoms.A special regulating mechanism at low revs constricts the phases and reduces the overlap (the duration of simultaneously open exhaust and intake valves), as a result the cylinders are well filled. With increasing speed, the control torque starts to work in the opposite direction: it increases the overlap, expands the phases, and together with good torques we have well blown cylinders at high revs.
But what if we have a classic motor, how to increase the engine power of the VAZ in this way? We install the wide-phase camshaft in the engine and forget about the low revs. Of course, we are unlikely to increase the rotational rotation, its absolute value will most likely remain the same as that of the serial engine, just in the area of higher revolutions. But the product of torque on revolutions will be already higher than that of the serial one, which means that we have increased the engine power.