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Differences Between Three-Cylinder and Four-Cylinder Engines?

1 Answers
DelRichard
07/29/25 4:30pm
The differences between three-cylinder and four-cylinder engines are: 1. Size and weight: Three-cylinder engines are smaller and lighter; four-cylinder engines are slightly heavier. 2. Fuel consumption: Due to their structural advantages, three-cylinder engines excel in fuel efficiency; four-cylinder engines tend to increase fuel consumption to some extent. 3. Power output: Three-cylinder engines have larger single-cylinder displacement, providing better power at low RPMs; four-cylinder engines have more cylinders, resulting in greater mechanical friction, which reduces single-cylinder efficiency.
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What is the speed limit on the Wu-Ke Expressway?

The speed limit on the Wu-Ke Expressway varies between 100 km/h, 80 km/h, and 60 km/h. Here are the specific details about the Wu-Ke Expressway: 1. Speed Limit: The speed limit on the Wu-Ke Expressway varies between 100 km/h, 80 km/h, and 60 km/h. 2. Overview: The Wu-Ke Expressway (Wugongtai-Karamay Expressway) has a total length of 206.692 kilometers, with a total investment of 4.5 billion yuan and a contractual construction period of 3 years. Its control points include Urumqi, Wugongtai, and Karamay. The project involves 19.392 kilometers of newly constructed sections, 187.3 kilometers of reconstructed sections, and 141.785 kilometers of auxiliary roads. The entire route features 9 interchanges and 48 separated interchanges.
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What are the reasons for the fluctuating idle speed of the Geely King Kong?

The reasons for the fluctuating idle speed of the Geely King Kong include an inappropriate air-fuel mixture ratio in the engine compartment; aging of the ignition coil and high-voltage wires of the spark plugs, as well as leakage issues, which reduce ignition efficiency after prolonged use; carbon buildup on the engine valves and intake ports, which absorbs fuel and reduces engine power; and malfunctioning of the coolant temperature sensor. Introduction to unstable engine idle speed: This refers to the imbalance of forces within the engine cylinders, causing piston collisions during operation, leading to engine vibration and deviation from the normal idle speed range. Unstable idle speed is one of the most common issues encountered in engine maintenance. Solutions for low idle speed: Check the throttle for oil accumulation or carbon deposits; clean the intake passages; inspect the condition of the spark plugs; check if the idle control valve is faulty; examine the injectors for any issues; and replace the engine oil promptly.
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How Often Should the Spark Plugs on a Volkswagen Jetta Be Replaced?

Volkswagen New Jetta's original spark plugs should be replaced every 20,000 kilometers. The model is Bosch FR7DC+, which is a nickel alloy resistance-type spark plug. Under normal maintenance conditions, spark plugs should be replaced after driving 40,000 to 60,000 kilometers. However, this may vary depending on the brand and engine, so it is recommended to follow the user manual. You can refer to the following standards for maintenance and replacement: platinum spark plugs should be replaced at 40,000 kilometers, ordinary nickel alloy spark plugs at 20,000 kilometers, and iridium spark plugs at 60,000 to 80,000 kilometers. Spark plugs are an important component of a gasoline engine's ignition system. They introduce high-voltage electricity into the combustion chamber and create a spark by jumping the electrode gap, thereby igniting the combustible mixture in the cylinder. They are installed on the side or top of the engine. In the past, spark plugs were connected to the distributor via ignition cables, but in the last decade or so, most car engines have switched to direct connection between the ignition coil and the spark plug.
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Is the Oath for Subject 4 Taken Individually or Collectively?

License issuance oaths are conducted collectively. Driving test staff will gather a batch of candidates, and after processing the licenses, they will uniformly take the oath facing the front desk. Once the oath is completed for the batch, licenses are issued, and candidates leave. Below is an introduction to Subject 4: 1. Overview: Subject 4, also known as the Subject 4 theory test or driver theory test, is part of the motor vehicle driver's license assessment. After the implementation of the Ministry of Public Security's Order No. 123, the Subject 3 test was divided into two parts: besides the road test, a safety and civilization knowledge test was added, commonly referred to as 'Subject 4,' which assesses 'driving ethics.' Since this test is conducted after Subject 3, it is commonly called the Subject 4 test. Officially, there is no such term as Subject 4. 2. Teaching Materials: 'Safe Driving Starts Here,' compiled by the Ministry of Transport of the People's Republic of China. Driving schools may uniformly purchase and distribute driving study materials, or candidates may purchase them at their own expense.
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How does ETC get power?

There are two power supply modes for the ETC in the car: one is using a solar panel for charging, and the other is using wired charging. Both types of ETC electronic tags have internal batteries. Solar-powered ETC devices do not require charging during daily driving, and the lithium battery can last for 3 years under normal use. However, for those who do not frequently use ETC, it is recommended to charge the ETC device every 3 months to effectively reduce the impact of natural discharge on the battery's lifespan. For solar-powered ETC devices, you can park the car under the sun for a few hours to charge the device. ETC is the abbreviation for Electronic Toll Collection, meaning electronic toll system. To apply for ETC, you need to provide the original and photocopy of the vehicle owner's valid ID card and vehicle registration certificate. If it is not the owner applying, the agent's valid ID card is also required. The photocopy of the vehicle registration certificate should include the page with the most recent annual inspection stamp. Additionally, you will need a bank card for deducting highway tolls, be between 18 and 60 years old, and own the vehicle in your name. The working principle of ETC: Through the on-board electronic tag installed on the vehicle's windshield, it communicates with the microwave antenna in the ETC lane at the toll station. Using computer networking technology, it settles accounts with the bank in the background, allowing vehicles to pay highway or bridge tolls without stopping when passing through toll stations. Benefits of installing ETC: Save time: Avoid the hassle of waiting in line; Green and environmentally friendly: Low-carbon, as vehicles pass through toll stations without stopping, reducing noise and exhaust emissions and pollution; Reduce wear and tear: Save costs by reducing the frequency of vehicle starts and stops, minimizing wear and fuel consumption, and users can enjoy toll discounts; Improve efficiency: ETC lanes can theoretically improve traffic efficiency by 2-3 times, making traditional ETC updates faster and more high-tech. Compared to license plate payment, ETC technology is more mature and advantageous.
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Should Fog Lights and Low Beams Be Used Together?

Not necessarily. Fog lights and low beams should be used together when visibility is below 200 meters. In heavy fog conditions, it is essential to turn on all lights, including hazard lights. The differences between fog lights and low beams mainly lie in their beam angle, brightness, and light penetration. Fog lights have strong penetration power, allowing them to cut through dense fog and provide clear visibility of the road ahead. However, fog lights should only be used in heavy fog conditions. They consume significantly more power than low beams and have higher beam angles, brightness, and penetration. While they are highly effective in foggy weather, their intense glare can be disruptive to other drivers in normal weather conditions, potentially leading to accidents. Low beams illuminate a certain distance in front of the vehicle with relatively low power and a beam angle below the horizontal line. Using low beams while driving has minimal impact or interference with other vehicles. However, in heavy fog, the weak penetration of low beams becomes insufficient, making it difficult for drivers to see clearly. In such cases, fog lights are necessary to compensate for the inability of low beams to penetrate heavy rain or dense fog.
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