Can a Car with Added Roof Rack Pass Annual Inspection?

What type of gasoline should the Hongqi H9 use?

The Hongqi H9 should use 95-octane gasoline, as recommended in the vehicle's official user manual. In addition to checking the appropriate gasoline grade in the user manual, you can also find this information on the fuel tank cap, which will indicate the recommended grade. Typically, the gasoline grade can also be determined based on the engine's compression ratio. Vehicles with a compression ratio between 8.6-9.9 should use 92-octane gasoline, while those with a compression ratio between 10.0-11.5 should use 95-octane gasoline. If the compression ratio is higher, 98-octane gasoline is recommended. However, with the use of new technologies, the compression ratio alone cannot determine the appropriate gasoline grade. High compression ratio engines can also be tuned to use lower-octane gasoline, as other factors such as ignition timing, turbocharging technology, and Atkinson cycle technology also play a role. Generally, the higher the gasoline octane rating, the higher the octane number and the better the anti-knock performance. 92-octane gasoline contains 92% isooctane and 8% n-heptane, while 95-octane gasoline contains 95% isooctane and 5% n-heptane. If the Hongqi H9 occasionally uses the wrong gasoline grade, simply switch back to the correct grade after the current tank is used up. However, long-term use of the wrong gasoline grade can have the following effects: For vehicles designed for lower-octane gasoline, using a higher-octane grade will not cause damage, but the increased octane number can alter the fuel's ignition point, leading to delayed combustion in the engine. This reduces both the engine's power output and thermal efficiency, resulting in poorer performance. For vehicles designed for higher-octane gasoline, using a lower-octane grade can cause engine knocking. The significantly lower octane number reduces the fuel's ignition point, causing premature ignition during the compression stroke. If combustion occurs before the spark plug fires, resistance is generated during the upward stroke, making the engine run very unevenly. Mild knocking may only increase noise without significant engine damage, but severe knocking indicates serious engine issues. The vibrations not only affect driving stability but can also cause abnormal wear on the pistons and cylinders, potentially leading to cylinder scoring in severe cases.

14

0

Share

What Causes Insufficient Brightness of Car Lights?

Insufficient brightness of vehicle headlights may be due to substandard fixtures, unsuitable bulb selection, poorly designed lighting circuits, or abnormal charging system operation. Reasons for insufficient brightness of headlights: short circuit in the headlight power line, burnt filament, blown fuse; poor contact or closure of the bimetallic strip in the headlight switch; damaged headlight switch. For fault diagnosis and troubleshooting, first determine the diagnostic scope, then probe according to the sequence of the lighting system's wiring to identify any open or short circuits. Automotive headlights, also known as car headlights or LED daytime running lights, serve as the 'eyes' of the vehicle. They are closely related to safe driving at night or under adverse weather conditions. In daily driving, proper use of headlights is essential to ensure road safety, and the maintenance of car lights should not be overlooked. Vehicle headlights are the primary light source for illuminating the road ahead during nighttime driving and are a major component of the vehicle's electrical system. The condition of car headlights directly affects driving safety and reliability. The quality of headlights is closely related to the quality of the bulbs used. Therefore, it is important to choose suitable bulbs, paying attention to parameter consistency, i.e., ensuring the voltage and power match the original vehicle specifications. Precautions for car headlights: Keep the headlight lenses clean, especially when driving in rain or snow, as dirt and dust can reduce the lighting performance by up to 50%. Some vehicle models are equipped with headlight wipers and washers. When two vehicles meet at night, the high beams should be turned off and low beams used when the distance between them is within 150 meters to ensure driving safety. To maintain headlight performance, check and adjust the headlight beams after replacing the headlights or every 10,000 kilometers driven. Regularly inspect bulbs, wiring sockets, and ground wires for oxidation and looseness to ensure good contact performance and reliable grounding. If contacts are loose, the on-off action of the circuit when turning on the headlights can cause current surges, burning out the filament. If contacts are oxidized, the bulb's brightness may decrease due to increased contact voltage drop.

6

5

Share

Where is the highest point of the wiper?

The highest point is at the far right of the front windshield. Here is more information about wipers: 1. Types of wipers: There are roughly two types of wipers. One is the traditional intermittent type, which is the most common wiper, with three to four segments, adjusted by the driver according to the rain intensity and visibility conditions. The other is the rain-sensing type, which has been increasingly used in mid-to-high-end models in recent years. A good wiper must have features such as heat resistance, cold resistance, acid and alkali resistance, corrosion resistance, the ability to fit the windshield, reduce the burden on the motor, low noise, strong water repellency, and soft material to avoid scratching the windshield, ensuring clear vision. 2. Function of wipers: A device used to remove raindrops and dust attached to the vehicle's windshield to improve the driver's visibility and enhance driving safety.

1

3

Share

Is the repair mark obvious when using a touch-up pen?

Using a touch-up pen to repair car paint scratches can yield decent results, but there will still be some color difference. Additional information is as follows: 1. Paint may peel off: There is indeed a possibility of paint peeling when using a touch-up pen for repairs. This is because the paint coating process used in car manufacturing is far more complex than simple application—not only are the paint materials different, but the coating process is also very rigorous. Many vehicles require high-temperature baking to dry the paint film. The higher cost of repairs at a 4S shop is due to the use of original factory paint and an attempt to mimic the coating process, ensuring better paint fusion and preventing subsequent peeling. If a touch-up pen is used directly, peeling may occur, especially if the steps are incorrect—such as failing to clean the car surface, applying too much paint, or exposing the car to excessive heat. The paint may peel off, and the car could later develop rust. 2. Limited application area: The repair effect of a touch-up pen is also quite limited, suitable only for very small and minor scratches. For car owners who want to avoid peeling, self-spray paint can be a better option. The advantage of self-spray paint is that it can evenly cover the car surface. When applying, maintain a slightly greater distance and use multiple layers until the new paint blends seamlessly with the original car paint, thus preventing peeling.

10

2

Share

What to Do If the Vehicle Identification Number Is Blurred?

If the vehicle identification number becomes illegible or damaged due to wear, rust, accidents, or other reasons, it is necessary to file a record with the vehicle management office and apply for a new rubbing. The following documents must be submitted: 'Motor Vehicle Change Registration/Record Application Form'; the original and a copy of the vehicle owner's identity proof; if an agent is involved, the original and a copy of the agent's identity proof must also be submitted (if the agent is a unit, the original and a copy of the handler's identity proof must also be submitted), along with a written authorization from the vehicle owner; the motor vehicle registration certificate; the motor vehicle driving license; and the motor vehicle inspection record form.

20

1

Share

How many seconds does the Crown take to accelerate from 0 to 100 km/h?

According to official data, the Toyota Crown is equipped with a 2.0T 8AR series engine, with a maximum power of 235 horsepower and a maximum torque of 350 Nm. It also uses an 8-speed automatic transmission, achieving a 0-100 km/h acceleration time of 7.4 seconds and a fuel consumption of around 12L. The factors affecting a vehicle's 0-100 km/h acceleration time are as follows: Torque: Torque, in simple terms, indicates how much force is available. The greater the torque, the more force is available to push the vehicle, naturally resulting in faster acceleration. The Toyota Crown has a maximum torque of 350 Nm, achieving a 0-100 km/h acceleration time of 7.4 seconds. Transmission efficiency: The transmission serves as the medium for transferring power, inevitably involving power loss. The higher the transmission efficiency, the better the acceleration performance. Generally, the ranking of transmission efficiency is as follows: manual transmission > dry dual-clutch transmission > wet dual-clutch transmission > AT transmission > CVT transmission. The Toyota Crown uses an 8-speed automatic transmission. Power-to-weight ratio: The relationship between horsepower and vehicle weight is called the power-to-weight ratio (unit: Hp/T). The higher the power-to-weight ratio, the faster the acceleration. The Toyota Crown has a power-to-weight ratio of 235 Hp/T, achieving a 0-100 km/h acceleration time of 7.4 seconds.

10

2

Share

Can a Car with Added Roof Rack Pass Annual Inspection?

What type of gasoline should the Hongqi H9 use?

What Causes Insufficient Brightness of Car Lights?

Where is the highest point of the wiper?

Is the repair mark obvious when using a touch-up pen?

What to Do If the Vehicle Identification Number Is Blurred?

How many seconds does the Crown take to accelerate from 0 to 100 km/h?

What Causes Mazda Ultrasonic Sensor Failure?

Can the BJ80 modified with Brabus be registered?

Why Is the Car Exhaust Fan So Noisy?

What model is bmw7154ad?