Zhongshan throttle valve

First, the engine power is insufficient due to no preheating and starting.

1, many car owners have the same experience, that is, in the severe winter, after starting the vehicle overnight, they found that the vehicle was as underpowered as "not enough to eat". In addition, over time, it is easy to cause an increase in vehicle carbon deposition. In fact, this is caused by driving without preheating in winter.

2. In winter, after the engine is left standing for one night, the residual pressure of lubricating oil on each friction surface has already disappeared, and the oil film protection is lost. Low temperature greatly increases the viscosity, adhesiveness and fluidity of lubricating oil. At this time, the motion resistance of starting the engine is greatly increased, and more than 60% of the power during starting is used to overcome the motion resistance.

3. In addition, if the engine is started immediately without preheating, the engine will have insufficient output power due to uneven mixing ratio; At low temperature, the fuel with insufficient atomization can not be fully burned, which is easy to form carbon deposit; Some gasoline, which is not atomized, will flow directly into the crankcase along the cylinder wall to mix with the engine oil, reducing the quality of the engine oil.

4. Normal engine warm-up can not only give full play to the normal power of the engine, but also prolong the life of the engine. In fact, the wear of the engine during cold start is roughly the same as that under other working conditions. Usually, the engine wear during cold start accounts for about half of the total wear. Preheating at this time can reduce this wear. At low temperature, metals will show low elasticity and wear resistance. Only at the working temperature can the engine reach the normal fit clearance and keep the best working condition.

Second, the longer the engine warms up, the better.

At the same time, engine warm-up does not last as long as possible. First of all, warming up the car for a long time is not conducive to environmental protection, the engine is useless and the fuel is wasted. Under normal circumstances, middle and low-grade cars can drive at normal idle speed, and the water temperature is 70℃ to 80℃. At normal idle speed, the carburetor engine runs smoothly after pushing back the choke valve; The EFI engine is reduced from 1200 rpm in the fast idle state to 800 rpm, and the driver can drive as long as he looks at the normal tachometer. It should also be noted that when warming up, don't slam on the accelerator and don't let the engine speed be too high.

Third, how long does it take for the engine to warm up?

After starting, it takes about one minute for the water thermometer pointer to move or the engine tachometer to fall back to idle speed. It is recommended that the owner drive at a low speed for the first 2 kilometers after starting, and then speed up normally.

Although there is no freezing weather in Zhongshan at present, frequent rainy weather often leads to slippery roads. Therefore, experts also specially suggest that when driving on the road in winter, you must drive at a constant speed and not rush to refuel or slow down. Soft refueling and slow down are the principles of driving in winter. When driving on a slippery road, try to walk in a straight line, do not change lanes frequently, and try to walk along the rut in the middle of the road. When starting on wet roads and driving at medium and low speeds, it is best to choose a higher gear to avoid slipping due to excessive driving force. Shift gears frequently, pay attention to the selection of gears and the cooperation of oil and gas, just like driving a running-in car.

Fourth, the benefits of engine preheating.

Engine preheating can prolong the service life of the engine.

Generally speaking, after the engine stands for one night, the residual pressure of lubricating oil on each friction surface has already disappeared, and the oil film protection has been lost; Low temperature greatly increases the viscosity of lubricating oil and deteriorates the adhesiveness and fluidity.

At this time, the motion resistance of starting the engine is greatly increased, and more than 60% of the power during starting is used to overcome the motion resistance of the cold machine. Authoritative research results show that the cooler needs preheating.

The wear amount of the engine during cold start is almost the same as that under other working conditions. In other words, the engine wear during cold start accounts for about half of the total wear. Normal idle preheating can reduce this wear and prolong the service life of the engine.

At low temperature, metals will show low elasticity and wear resistance; Only at the working temperature can the engine reach the normal fit clearance and keep the best working condition. Start the engine at low temperature, and then start driving. Due to the uneven mixing ratio, the engine output power is insufficient; At low temperature, the fuel with insufficient atomization can not be fully burned, which is easy to form carbon deposit; Some gasoline, which is not atomized, will flow directly into the crankcase along the cylinder wall to mix with the engine oil, reducing the quality of the engine oil.

But the time to warm up the car is not as long as possible. Hot car for a long time, the engine is useless, wasting fuel, not conducive to environmental protection. Under normal circumstances, it is advisable for middle and low-grade cars to drive at normal idle speed. The normal idle speed is reduced from 1200 rpm in the fast idle state to 800 rpm. Look at the normal tachometer and you can go.

Not only the engine but also the gearbox needs to be warmed up. When the engine is cold, repeated starting should be avoided, because repeated starting will aggravate the wear of moving parts and reduce the overall working life of parts and even the engine.

Verb (abbreviation of verb) Precautions for engine preheating

1, both EFI diesel engines and direct injection diesel engines need to be warmed up.

Because the purpose of engine preheating is not only to make the fuel fully burn and the antifreeze temperature rise, but also to make the lubricating oil form a protective film. However, some preheating devices of diesel engines still have some limitations in forming protective films on lubricating oil.

2, the engine warm-up time is not as long as possible.

If the car is warmed up for a long time, the diesel engine will be useless, which not only wastes fuel, but also is not conducive to environmental protection. Generally, it is more appropriate for diesel engines to warm up for 3-5 minutes before starting to work with load.

3. Try to avoid starting the machine many times when it is cold.

Repeated starting of diesel engine will aggravate the wear degree of moving parts and reduce the service life of parts and engines. According to authoritative research, more than 50% of engine wear is caused by cold start, so reducing the number of cold starts will prolong the service life of the engine.

4. When the engine is warm-up, check whether the relevant parts and work of the engine are normal.

When the engine warms up, check whether the indicator light on the instrument panel is normal, listen to the engine for abnormal sound, and check whether the engine smokes normally.

5. Look at the tachometer to determine whether the idle speed is normal.

Under normal circumstances, the operator can judge whether the machine preheating is completed only by looking at whether the tachometer is normal.