What is a high revving engine

The professional off-road vehicles and large construction machinery vehicles you can see now are high-torque engines, which achieve great power output through large displacement and low speed.

1. Large torque, easy to start, strong drag force.

2. The maximum torque generally appears at about 3000 rpm.

3. The engine will have relatively low power compared with the car engine of the same displacement.

4. This type of engine is generally referred to as a low-rev engine.

The cars we usually use generally use high-speed engines, and the characteristics of this type of engine are:

1. The maximum power generally appears above 5000 rpm.

2. The maximum speed quota is high, some even as high as 7000 rpm, and high speed shifting is required.

3. Compared with off-road vehicles of the same displacement, the maximum torque appears later and is smaller, but the efficiency is higher.

4. This type of engine is generally referred to as a high-speed engine

At present, with the improvement of the computer control system technology of the engine, there are many engines with the characteristics of both engines, but they are all adjusted by computer when the engine is produced and loaded.

Take the famous 4G64 engine as an example:

It is not only installed on the Mitsubishi Pajero V31, Outlander, Great Wall Harvard, Cheetah 6470, but also on many domestic cars such as Zhonghua and BYD cars. It can be said to be an all-round engine.

The so-called all-round is not that the engine can be installed and can be used in any car.

If the 4G64 is installed on an off-road vehicle, the maximum torque must be adjusted to a larger amount, and the time to appear a little earlier (that is, the maximum torque appears at a smaller speed) If it is installed on a car, it is the opposite, and the maximum power must be adjusted to the maximum.

Generally speaking, if the power of the same engine is adjusted very much, the maximum torque is relatively small, and it appears later; Vice versa.

It is to reach the maximum torque of the engine above 4000 rpm.

Causes of high engine speed: Failure of the intake system, sudden increase in throttle opening, slippage or damage to the clutch of the air conditioner, and sudden loss of load on the engine will also cause the speed to rise.

The speed of the engine is related to the number of work times per unit time or the effective power of the engine, that is, the effective power of the engine changes with the different speeds. The working condition of the engine at the rated power and rated speed is called the calibration condition. Rotational speed size:

The engine speed can generally reach 700r min when idling, and it can reach 3000r min during normal operation.

Reasons why the speed of the car becomes high:

1. The intake system is faulty, and the throttle opening suddenly becomes larger.

2. If the cylinder pressure is not enough, check the piston ring and piston wear.

3. The problem of engine oil.

4. The clutch of the air conditioner slips or is damaged, and the engine suddenly loses load, resulting in an increase in speed.

5. Caused by the forced downshift of the transmission computer or the failure of the transmission inside.

6. The engine output power is insufficient.

Generally, the main reason for the idle speed is too high is the excessive air intake or the engine control signal error at idling, and the reasons for the idle speed is too high are the failure of the intake air temperature sensor, the failure of the water temperature sensor, the failure of the throttle position sensor, the failure of the air flow meter or the absolute pressure sensor of the intake manifold, the failure of the switch signal, the failure of the idle control valve, the failure of the throttle body, the failure of the fuel injector, the vacuum leakage, the failure of the engine control unit or the problem of matching settings, etc., let's take a closer look at it below.

Hello, I'm helping you sort out the answers to your questions, please wait a moment Oh ask questions. The 2013 Honda Fengfan manual naturally aspirated 120 miles high-speed requires stepping on the accelerator to 3500 rpm.

If there is an answer to your question, if the idle speed of this car is high, it may be caused by dirty throttle, and you need to clean the throttle. Then you can match it with a computer. In addition, if there is a leak in the vacuum tube, this problem will also occur, this needs to clean the throttle first, and then check whether there is any air leakage in the air intake system?

On these two issues, it will lead to ** special too high.

At 120 yards, if you get to 3500 blocks at this speed, it is possible that your clutch plate is slipping. First, check the clutch plates.

Questions. Are there any other reasons?

Not much for other reasons. , just a little more for these two reasons.

Questions. How to determine clutch wear slippage.

If you want to determine if the clutch plate is slipping, you can only test the vehicle.

Questions. Okay, okay, thank you for your answer.

Okay, you're welcome.

When starting the car in winter, the engine is loud and the speed is high, is there something wrong with the car?

Many drivers pay special attention to the speed, but rarely pay attention to the speed of the engine, in fact, the existence of the tachometer also directly indicates the importance of speed.

I believe that many car owners will find such a phenomenon when starting the vehicle, that is, at the moment of starting the vehicle, the speed indication of the car will rise quickly, and the pointer will be maintained at more than 1000 rpm, and then in half a minute to 2 minutes, the speed will gradually return to the conventional idle state, and the engine speed will be reduced to below 800 rpm, and many car owners still do not understand this phenomenon. What causes the engine speed to be too high when the car is started? What to do?

In fact, this situation will occur in almost all vehicles, the high speed of the car starting, in fact, it is called the high idle state of the car, which is essentially idling, but it is not controlled by the driver, but controlled by the on-board computer, in different cases, there will be obvious differences in the speed when starting, such as in winter, because in the state of starting, the engine temperature is much different from the normal working temperature, so the speed of the initial start of the engine will increase accordingly, Some cars even reach 2,000 rpm.

The reason why the car reaches high rpm in the initial state is mainly to achieve the "wake-up" of the vehicle. Because the high speed of the engine is conducive to the full combustion of fuel, that is, to realize the normal working conditions of the car, at this time, the on-board computer reads and obtains all the state information of the car in a short time, and then all the data are combined and processed, and then all the parts of the car are adjusted to a reasonable state, so as to successfully start the vehicle, at this time the car is in the "standby state", at this time, in order to save fuel, the engine speed will be restored to the normal idle state.

The advantage of this is that after a period of idling, the car can drive immediately without the need to adjust and control the parameters again. It's like when you wake up from your sleep, you immediately observe your surroundings and then do what you're supposed to do. The high speed of the car when starting is not adjustable for the owner, and the high speed at the start is only relative to the normal idle speed, which is still far from the real high speed (more than 3000 rpm), which is essentially to help the vehicle return to the "ready driving state".

Many car owners are accustomed to heating up their cars in winter, but the main purpose is the same.

The wear of the engine in the state of just starting is very serious, accounting for more than 80% of the wear of the entire engine, because the internal wear of the engine mainly depends on the oil, and the oil lubrication needs the crankshaft and the oil pump to drive, the oil film is not established at the moment of starting, the friction is very large, if the start starts to step on the accelerator to accelerate, the wear and tear of the engine is very large, for each owner, if you can do a good job of lubricating the engine at ordinary times, use better oil, In fact, it is very beneficial for engine maintenance.

The opening of the throttle is larger, and the rotational speed will be higher.

The throttle of the gasoline engine does not control the amount of fuel injected, it controls the throttle opening. The opening is small, and the mixing gas entering the cylinder is less, so that the power emitted by the engine is small, and vice versa.

The more mixed gas entering the cylinder, the greater the force emitted by combustion, so that the force that pushes the piston is greater, the piston moves faster, and the engine speed is faster.

An engine is a machine that can convert other forms of energy into mechanical energy, such as internal combustion engines, external combustion engines, electric motors, etc.

For example, the internal combustion engine usually converts chemical energy into mechanical energy. An engine can be applied to both a power generation unit and an entire machine including a power unit.

High engine speed is generally caused by damage to the intake pipe, injector failure, idle switch is not closed, exhaust system failure and other reasons, 1. Intake pipe damage: Generally speaking, the opening of the idle control valve and the air intake volume are balanced, if the intake pipe of the vehicle is damaged and leaking, the air intake volume will be unbalanced, at this time it will cause the phenomenon of high engine speed, in this case, the intake pipe should be inspected and repaired, 2. Injector failure: if the injector fails, It will cause the mixed gas in the cylinder to be too concentrated or too thin, so that it can not work normally, resulting in the phenomenon that the engine speed is too high or too low, which should be inspected and repaired on the injector, 3. The idle switch is not closed

If the idle switch is not closed, the engine will be in an overload state, so the speed will naturally be very high, 4. Exhaust system failure: If the three-effect catalytic converter has serious carbon deposition, it will cause the exhaust system to be in a situation, which will lead to insufficient exhaust and cause the speed of the car to increase.

The reasons for the high speed of the automobile engine are: 1. The throttle opening suddenly becomes larger; 2. The fuel injector is dripping or clogged; 3. The clutch of the air conditioner is slipped or damaged; 4. Air leakage in the air intake system; 5. The engine output power is insufficient. The solution to the high speed of the car engine is:

1. Adjust the throttle opening; 2. Replace the fuel injector, air conditioning clutch, air intake system, and engine. The speed refers to the number of revolutions per minute of the engine crankshaft, the speed of the engine, related to the number of times of work done per unit time or the size of the effective power of the engine, its role is: timely response to the operation of the engine, so that the driver can better cooperate with the transmission gear and throttle position, so that the car maintains a better working condition.