Is a motorcycle speed of over 70 km/h considered fast?

Can You Drive with Engine Oil at the Lower Limit?

Engine oil at the lower limit is still drivable. When the oil level reaches the lower mark on the dipstick, it only indicates that the engine oil quantity has reached the minimum allowable level, not that there is no oil left. Typically, there is about one liter of capacity between the upper and lower marks on the dipstick. Even at the lower limit, the lubrication function of the oil remains sufficient, but it is advisable to add oil as soon as possible. The functions of engine oil are as follows: Lubrication: There is rapid relative sliding between the piston and cylinder, as well as between the main shaft and bearing. To prevent excessive wear of parts, an oil film needs to be established between the two sliding surfaces. A sufficiently thick oil film separates the surfaces of the relatively sliding parts, thereby reducing wear. Auxiliary Cooling: Engine oil has a relatively low specific heat capacity and, being inside the engine, does not inherently have a cooling effect. However, during engine operation, heat is generated by fuel combustion. The oil can carry this heat back to the oil pan, where it is dissipated into the air, assisting the radiator in cooling the engine. The actual cooling is performed by the water outside the engine casing.

9

3

Share

Is it okay to run the AC without driving?

Running the AC without driving is acceptable for short periods, but it is not recommended for extended durations. Below are the impacts of running the AC without driving and the working principle of the automotive AC automatic control system: Impacts of running the AC without driving: Running the AC for a long time without driving can lead to increased carbon deposits in the engine. Carbon deposits are quite harmful to the engine. When the engine is idling, the combustible mixture in the cylinders cannot burn completely, resulting in an accumulation of carbon deposits in the engine. Principle of the automotive AC automatic control system: Based on signals from various sensors detecting cabin temperature, evaporator temperature, engine coolant temperature, and other relevant switch signals, the system outputs control signals to regulate the operation of the radiator fan, condenser fan, compressor clutch, blower motor, and air control motor, thereby achieving automatic control of the cabin temperature.

5

1

Share

Are Electric Vehicle Charging Piles Universal?

Electric vehicle charging piles are universal, and the following are the standards and precautions for universal charging piles: Standards for universal charging piles: The electric vehicle must comply with national standards, and the charging pile used must also comply with national standards to be universal. Otherwise, many compatibility issues may arise. After the national standards were issued, newly built charging facilities have been manufactured and installed according to the national standards, and existing charging facilities are gradually updating their interfaces to achieve standardization. Precautions for charging piles: In cold weather, check whether the electrolyte of the battery is frozen before charging. Do not charge a frozen battery. Before charging, check the electrolyte level; do not charge if the electrolyte is insufficient. During charging, measure the density and voltage of the electrolyte approximately every hour and check its temperature. The charging area must be well-ventilated and strictly no open flames are allowed. Charging should be stopped when unattended.

11

5

Share

Can You Add Water If the Antifreeze Is Insufficient?

You cannot add water if the antifreeze is insufficient. The main components of antifreeze are: 50% purified water, 40% methanol, and 10% other substances. Antifreeze Replacement Cycle: Vehicle antifreeze generally needs to be replaced every 2 years or 40,000 kilometers. This is only a reference cycle. For commercial vehicles with longer mileage, the replacement cycle is shorter. Since each vehicle's driving conditions vary, the replacement should be based on actual usage. Check the antifreeze's condition; if it is found to be insufficient, replenish it promptly. If suspended particles, sediment, or signs of deterioration or discoloration are observed in the antifreeze, replace it immediately and clean the system. Antifreeze Replacement Method: Before completely replacing the antifreeze, conduct a thorough inspection to check for any signs of leakage or cracks in the pipes, with a focus on the five-way water pipe. The five-way pipe is named for its five connecting interfaces to various parts. Antifreeze flows through the five-way pipe and is distributed to different parts of the car to function. If there is any leakage of antifreeze in this part, replace the water pipe or resecure the interface as needed. Drain the old antifreeze, then flush the liquid channels with clean water. Add clean water to the antifreeze reservoir and continue filling the reservoir with water until it flows continuously through the engine cooling system. Then, start the engine and let it idle for 3 to 5 minutes to circulate the water. Initially, the water flowing out of the reservoir will have a faint pink color. Continue adding clean water until the outflowing water is clear. Note: Remember to disconnect the heater hose and drain the water from the heater core. After draining for about an hour, add the new antifreeze through the radiator hose, which allows the antifreeze to flow quickly into the radiator. Then, add another container of antifreeze to the antifreeze reservoir until it is nearly full. Start the engine and let it run for about 10 minutes. During this time, the coolant level will drop slightly as some air is expelled from the cooling system. Add more antifreeze until the reservoir reaches the maximum mark "MAXT."

19

5

Share

What lights should be turned on when driving on the highway at night?

When driving on the highway at night, you should turn on the high beams, low beams, turn signals, and width indicators. Below are the correct practices for using lights and precautions for nighttime driving: Correct practices for using lights: During normal driving, turn on the night lights and width indicators. If there are no vehicles ahead, you can appropriately use the high beams to briefly observe the road surface and surrounding conditions at a greater distance ahead, then quickly switch back to low beams. When meeting another vehicle, use a combination of high and low beams. If there is a vehicle ahead or an oncoming vehicle, switch from high beams to low beams. Precautions for nighttime driving: When driving at night, it is essential to control your speed; pay attention to road conditions; as drivers' reaction times decrease at night, it is even more important to reduce speed and maintain a safe following distance, especially in poorly lit areas. Always slow down and, if encountering hazardous sections, stop to assess the situation before proceeding.

10

2

Share

What is the Principle of an Automotive Transmission?

The principle of an automotive transmission is to use gear combinations with different numbers of teeth to achieve changes in speed and torque. Below are the functions of the transmission and operational precautions: Functions of the Transmission: Change the transmission ratio to meet the traction needs under different driving conditions, allowing the engine to operate under favorable conditions; enable the vehicle to move in reverse; interrupt power transmission when the engine is idling, shifting gears, or parking, cutting off power to the drive wheels; achieve neutral gear, where the transmission stops outputting power when the clutch is engaged. Precautions for Transmission Operation: When operating a manual transmission, ensure the gear lever is moved into the neutral position without shaking it back and forth, and avoid looking down at it; never force the gear lever, as this may cause misalignment or damage to the transmission mechanism. When operating an automatic transmission, avoid coasting in neutral and do not shift into reverse before the vehicle has come to a complete stop.

15

0

Share

Is a motorcycle speed of over 70 km/h considered fast?

Can You Drive with Engine Oil at the Lower Limit?

Is it okay to run the AC without driving?

Are Electric Vehicle Charging Piles Universal?

Can You Add Water If the Antifreeze Is Insufficient?

What lights should be turned on when driving on the highway at night?

What is the Principle of an Automotive Transmission?

Will the 4S store replace a new car tire for free if it's damaged?

Is the Electronic Driver's License from Traffic Management 12123 Nationally Valid?

Where are the engine sensors located?

Does the auto headlight consume battery when parked?