What you need to know about increasing engine power?
Car tuning,  Car device

What you need to know about increasing engine power?

Engine power increase


Increase power. Any modification of an engine to improve its performance is a difficult task. Based on a clear idea of ​​what we want to get, how to do it and whether it can be done at all. Here you can not do without knowledge of the working processes of the engine. It is also necessary to understand that everything is interconnected in the engine. Replacing one unit changes the entire workflow, from air intake to exhaust pipe cutting. In addition, each intervention has a different effect in different modes. What is good in one mode may be bad in another. The main characteristics of the engine, we usually refer to torque and power. It is they who seek to increase by tuning the engine. This can be done in two main ways. The first way is to increase the crankshaft torque.

Increase engine power with crankshaft torque


Secondly, without touching the magnitude of the torque, move it to the high speed zone. Types of nitric oxide systems. Increase the torque. Kit for tuning the engine. The torque is practically independent of the crankshaft speed, and is determined only by the size of the engine and the pressure in the cylinder. With volume, everything is clear. The more engine design allows, the better. Pressure can be increased by increasing the compression ratio. It is true that there are several reservations, the possibilities of this method are limited by detonation. You can approach from the other side. The more air-fuel mixture we move in the engine, the more heat will be released during its combustion in the cylinder and the higher the pressure in it. This applies to naturally aspirated engines.

Increasing engine power through the control unit


The second option is applicable to the battery engine family. By changing the characteristics of the control unit, you can slightly increase the gain so that more torque can be removed from the crankshaft. And the third option is to achieve better filling of cylinders by improving gas dynamics. The most common and most unjustified. The idea is that you need to do something with the air ducts and the combustion chamber. working volume. One of the main options is the maximum cylinder capacity. Reasonable, of course. For a road car, this approach is the most correct. Because by increasing the volume without replacing the camshaft. That is, by leaving the torque curve in the same speed range as before, the driver will not need to break the driving style.

Power Up Methods


The working volume can be increased in two ways. Replacing a standard crankshaft with a high eccentric crankshaft or scattering cylinders for large pistons. It is logical to ask what is more effective and what is cheaper. After all, what is engine displacement. This is the product of the area of ​​the piston and its stroke. Relatively doubling the diameter, we increase the area four times. And when we double the stroke, we only double the volume. Now to the question of economics. At first glance, it seems that replacing the crank mechanism is cheaper than loading a larger block. The caveat is that you still have to look for a crankshaft with a large eccentricity. Rare companies make them to order, the products are expensive and complex.

Power Boost Elements


In this case, it is reasonable to rely on the manufacturer's standardization. Therefore, it is logical to buy a serial product, in our case, a crankshaft, and already choose a group of pistons for it. Of course, you will need other pistons and connecting rods. It's hard, but you can accept it. The question is different. Structurally, this move causes additional mechanical losses during engine operation, which will be caused by shorter connecting rods. This is an axiom - to accommodate a crankshaft with a large eccentricity, you will have to put shorter connecting rods, because we will not be able to build a block. What is their disadvantage? The shorter the connecting rod, the greater the angle at which it breaks. The greater the pressure that presses the piston against the cylinder wall. And the greater the clamping force at the same coefficient of friction, the greater the resistance value.

Power Factors


And this factor must be taken into account not only in terms of mechanical losses, but also in terms of reliability. Because short connecting rods are subjected to heavy loads. As a rule, such trifles are neglected when setting up. An obvious advantage in terms of minimizing costs is an increase in displacement due to an increase in the diameter of the cylinder. As a rule, all engines have a fairly thick cylinder wall, safety factor. If, say, we increase the diameter by two millimeters, we can get additional volume. With a wall thickness of 7-8 mm, one millimeter can be sacrificed. And quite often, production pistons can be deflected. It is true that it is impossible to state unequivocally that an increase in the diameter of the cylinders is impossible, with the exception of replacing the crankshaft. It is advisable to consider each of these two methods in terms of the specifics of an individual engine. Supercharging technology.

Increase power through the turbocharger


The family of turbocharged engines is interesting for tuning due to its design features, which greatly simplify engine tuning. In our case, you can get more torque again without touching the curve or volume, without even taking the motor apart. Just change the gain value a little. What is the design characteristic of rechargeable engines? First of all, in the compressor control characteristics, be it a turbine or a mechanical compressor. The amplification pressure of both the first and second depends on the engine speed. The more revolutions, the higher the pressure. But it can only be increased to a certain value. The control unit controls this, removes excess pressure. Its characteristic is changing. And it reaches really more volume than in the case of soft parameters in a serial engine. Work to increase pressure is not painless. Serial engines have a certain margin for mechanical and thermal loads, in terms of knock resistance.

Increase engine power through the combustion chamber


The increase in traction is possible within reasonable limits. But if you take a step forward in order not to break the engine, you will have to resort to additional changes. To increase the volume of the combustion chamber, change the cooling system, install an additional radiator, air intakes, intercooler. You may need to replace the cast iron crankshaft with a steel one, get stronger pistons and keep them cool. Changes in gas dynamics. The bottom line is clear - to get more torque, you need to increase the charge of the air-fuel mixture. What can be done ? You can take the tool and fix the defects of the serial installation. Make the intake and exhaust ports smoother and smoother, remove skirting boards and sharp corners in parts, remove wind protection zones in the combustion chamber and replace valves and seats.

Power increase guarantee


A lot of work, but no guarantee. Why? Aerodynamics is not an easy thing. It is difficult to describe mathematically the processes occurring in the engine. Sometimes the result is exactly the opposite of what was expected. For the sake of justice, it should be said that there are reserves in aerodynamics. But it is guaranteed that they can be removed only by performing a series of experiments, blowing plastic models of the input channels with a special installation. Selection of the shape and section in accordance with the requirements of the new engine operating conditions. This is unlikely to be done. Sports camshafts. What is power? This is a product of engine torque and engine speed. Thus, shifting the standard torque characteristic to the high-speed zone, we get the desired increase in power.

Questions and answers:

How can the power of a naturally aspirated engine be increased? Replace the crankshaft, bore the cylinders, install lightweight connecting rods and pistons, install a different camshaft, modify the intake system (supercharger).

What is needed to increase engine power? Increase the volume of incoming fuel, improve fuel atomization (improves the quality of HTS), eliminate inertial losses (replace heavy parts with lightweight ones).

What increases the power of the car? Reducing mechanical losses (installing lightweight parts), reducing inlet resistance, increasing the compression ratio, boosting, increasing the volume of the internal combustion engine, air cooling, chip tuning.

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