CreditParts modification technology for the mass market – Variable Valve Timing
The role and function of variable valve timing in racing are mainly as follows:
Improve power output:
When a car is running at high speed, the engine speed is very high. The engine needs a lot of air to participate in combustion in order to generate strong power.Variable valve timing technology can open the intake valve in advance and delay the closing of the intake valve, using the inertia of the intake to allow more air to enter the cylinder, while opening the exhaust valve in advance and delaying the closing, exhausting the exhaust gas more thoroughly, increasing the scavenging efficiency, and making the engine burn more fully, thereby significantly improving the power and torque of the car at high speed.
Improve fuel economy:
Under certain working conditions of the car, such as cruising on the track or driving at low speed, the variable valve timing system will adjust the valve opening and closing time to keep the engine at a reasonable air-fuel ratio, so that the fuel can be burned more fully, reduce fuel waste, improve fuel economy, and enable the car to travel longer distances without increasing the amount of fuel carried, reduce the number of pit stops for refueling, and save race time.
Enhance engine response speed:
Variable valve timing technology can quickly adjust the opening and closing time of the valve according to the real-time working conditions of the car engine. When the driver suddenly accelerates or decelerates, the engine can quickly adapt to the load change and quickly adjust the intake and exhaust, making the engine’s power output more sensitive, making the acceleration, deceleration and gear shifting of the car smoother, and improving the car’s handling performance.
Improve engine operation stability:
Under different speeds and loads, the variable valve timing system precisely controls the opening and closing of the valve to make the engine’s combustion process more stable, reduce the occurrence of abnormal combustion phenomena such as knocking and backfire, ensure that the engine can operate stably under various complex competition conditions, and improve the reliability and durability of the car.
Structural composition
It is generally composed of armature assembly, magnetic isolation sleeve, coil assembly, valve core and other parts1.
Armature assembly:
Usually composed of a push rod and an armature. When the coil assembly is energized to generate a magnetic field, the armature will drive the push rod to move.
Magnetic isolation sleeve:
Isolates the armature assembly from other components to ensure the effective effect of the magnetic field and provide a sliding track for the armature.
Coil assembly:
Includes an electromagnetic coil arranged around the magnetic isolation sleeve and a shell arranged outside the electromagnetic coil. When energized, a magnetic field is generated to drive the armature assembly.
Valve core:
Slides in the valve sleeve and controls the opening and closing of the oil channel port through cooperation with the push rod, thereby controlling the flow direction and pressure of the engine oil.
How VVT works
The VVT oil control valve operates based on the engine’s operating condition signal.
Receiving signals:
The engine control unit (ECU) calculates the optimal valve timing required by the current engine based on the information fed back by the crankshaft position sensor, camshaft position sensor, throttle position sensor, etc. Then, the ECU sends the corresponding electrical signal to the VVT oil control valve.
Controlling the flow direction of the oil:
After the VVT oil control valve receives the electrical signal, the coil assembly is energized to generate a magnetic field, attracting the armature assembly to move, so that the push rod pushes the valve core to move axially. The movement of the valve core changes the opening and closing state of the oil channel port, thereby controlling the oil flow to different chambers of the camshaft phase adjuster.
Adjusting the valve timing:
After the oil enters the camshaft phase adjuster, it pushes the internal blades or pistons and other mechanisms to change the angle of the camshaft relative to the crankshaft, so as to advance or delay the valve opening and closing time, and achieve the purpose of optimizing the valve timing.
The reasons for replacing the variable valve timing system in a racing car usually include the following:
Adapt to different tracks and race conditions:
Different tracks have different characteristics, such as the length of straights, the type and number of curves, etc. The car needs to adjust the valve timing according to the track conditions to obtain the best performance. For example, on a track with many long straights, it is necessary to pay more attention to the power output at high speeds. The valve opening and closing time at high speeds can be optimized by replacing the variable valve timing system; on a track with many curves, the engine needs to have good torque and response at medium and low speeds. At this time, it is necessary to replace the variable valve timing system that can meet this demand.
Improve the overall performance of the car:
With the continuous development of racing technology, the team will continue to upgrade and optimize various components of the car in order to pursue faster lap times and better race results. The new variable valve timing system may have better performance in terms of control accuracy, response speed, adjustment range, etc. After replacement, it can further tap the potential of the engine and improve the overall performance of the car.
Repair or replace faulty parts:
If the original variable valve timing system fails, such as solenoid valve stagnation, camshaft phase adjuster damage, etc., it will cause inaccurate valve timing, affect the normal operation of the engine, reduce the power of the car, increase fuel consumption, etc. At this time, it is necessary to replace the variable valve timing system in time to restore the performance of the engine.
Cooperate with the upgrade of other engine parts:
When the racing car upgrades other engine parts, such as pistons, crankshafts, intake manifolds, etc., in order to make the engine parts better match and work together to play the best overall performance, it may also be necessary to replace the corresponding variable valve timing system to ensure that the opening and closing time of the valve matches the working state of other parts to maximize the engine performance.
At the end of the article, we wish every car lover a wonderful car modification career.
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