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What is the in-cylinder temperature of a car engine?

2 Answers

LeRuth

08/30/25 2:56am

The in-cylinder temperature of a car engine is approximately 90°C. Here is some relevant information about car engines: 1. Classification: Based on the working method of the intake system, they can be divided into four types: naturally aspirated, turbocharged, mechanically supercharged, and dual-charged. 2. Principle: A four-stroke gasoline engine mixes air and gasoline in a certain proportion to form a good combustible mixture, which is drawn into the cylinder during the intake stroke. The mixture is compressed, ignited, and burned to generate thermal energy. The high-temperature and high-pressure gas acts on the top of the piston, pushing the piston to perform reciprocating linear motion, and outputs mechanical energy externally through the connecting rod, crankshaft, and flywheel mechanism. A four-stroke gasoline engine completes a working cycle during the intake stroke, compression stroke, power stroke, and exhaust stroke.

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Larry

09/11/25 7:04am

I've worked on many engines, and the in-cylinder temperatures can often be shockingly high. For instance, at the moment the spark plug ignites the air-fuel mixture, temperatures can surge above 2000 degrees Celsius. On average, during the compression stroke, it's around 600 degrees, maintaining between 800 to 1000 degrees during combustion. This depends on factors like engine speed, load, and fuel type—gasoline engines run slightly hotter than diesel ones. Excessive temperatures can damage piston rings or valves, shortening engine life. I recommend car owners regularly check the cooling system and replace engine oil and coolant to dissipate heat. It's best not to let the engine idle for long periods in traffic jams, or you might face trouble when the overheating warning light comes on. If you suspect abnormal temperatures, using a professional diagnostic tool to read sensor data is the most reliable approach.

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Can laundry detergent be used to wash cars?

It is not recommended to use laundry detergent for car washing because laundry detergent is not specifically designed for cleaning car bodies. Some laundry detergents are alkaline cleaners, and prolonged use can damage the car body, causing the paint to become dull and lose its shine over time. It is advisable to use dedicated car wash soap, which is specially formulated to provide better cleaning and stain removal for the car body without irritating the skin. The correct car wash solution should be a dedicated car wash soap, preferably one that contains wax. During the car washing process, computer car washes use professional car wash soap with a neutral pH, which does not erode the car's surface and contains water wax components. This not only cleans the car but also provides a moisturizing and protective effect, enhancing the paint's shine without causing damage. It is best to go to a professional car wash shop that offers fully automated high-pressure washing, foam spraying, gentle scrubbing without damaging the paint, full chassis cleaning and maintenance, as well as wax spraying, drying, and polishing. After the car comes out of the car wash machine, only a chamois cloth is needed to wipe the mirrors, ensuring excellent cleaning results, saving time, and protecting the car.

Are Brake Caliper Covers Illegal?

Installing brake caliper covers will result in failing the annual vehicle inspection. Introduction to Automotive Brake Caliper Covers: Automotive brake caliper covers mainly use high-temperature resistant adhesive, but they tend to fade over time, resulting in a very unattractive appearance. If low-quality caliper covers are used, they may fall off and get stuck in the tire's mechanical parts, or the metal rods on the covers could puncture the tire, causing a blowout. This is extremely dangerous during high-speed driving, so for the sake of driving safety, it is advisable not to install them. Braking System: Brake calipers are clamping devices designed to slow down, stop, or maintain the stopped state of a moving wheel, typically used only in disc brake systems. The working principle of disc brakes can be described using the analogy of a rotating disc: if you pinch the disc with your thumb and index finger, the disc will stop rotating. In this analogy, the thumb and index finger represent the function of the brake caliper.

Do traffic cameras capture the front or rear of motorcycles for violations?

Generally, the rear is captured because underground induction loops are typically installed, with digital cameras mounted on crossbars for snapshots. This requires two pulse signals to be generated simultaneously within the same time interval (during the red light cycle) to be considered "valid." For example, if the red light is on and the front wheel of the vehicle crosses the line while the rear wheel has not yet crossed, only one pulse is generated. Without two consecutive pulses, no photo is taken. Methods for capturing red-light violations: At traffic intersections, there are generally two methods for capturing red-light violations. One involves underground induction loops with digital cameras mounted on crossbars to snap photos of red-light runners. The other uses mounted cameras to record real-time footage of speeding, red-light running, and illegal parking. At least three images are captured: Regardless of the method, at least three images are taken of the violating vehicle: one showing the moment of the violation, one for license plate recognition, and one providing a full-view image. Both methods operate 24/7, and the images are typically retained for one week.

Is the annual inspection for small cars every six years or every two years?

After the implementation of the new vehicle inspection regulations, small cars between 6 and 10 years old require an inspection every 2 years. At the 6th and 8th year, the vehicle must undergo an on-site inspection. For private cars over 10 years old, the original inspection cycle still applies: vehicles between 10 and 15 years old require an annual inspection, while those over 15 years old require an inspection every 6 months. Operational passenger vehicles: Operational passenger vehicles must be inspected annually within the first 5 years; after 5 years, they require an inspection every 6 months. Freight vehicles: Freight vehicles and large or medium-sized non-operational passenger vehicles must be inspected annually within the first 10 years; after 10 years, they require an inspection every 6 months. Small and mini non-operational passenger vehicles: Small and mini non-operational passenger vehicles must be inspected every 2 years within the first 6 years; after 6 years, they require an annual inspection; after 15 years, they require an inspection every 6 months.

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