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How to Improve Thermal Efficiency?

1 Answers
VanMaci
07/25/25 7:05am
Improving thermal efficiency can be achieved through the following methods: 1. Reducing friction losses; 2. Enhancing the internal lubrication performance of the engine; 3. Improving the combustion conditions of the engine. Automotive thermal efficiency refers to the ratio between the mechanical work output by the engine and the chemical energy produced by burning fuel, which evaluates how much heat is converted into effective work. When the engine operates, only a portion of the thermal energy contained in the fuel is transformed into propulsion work, while the rest is lost in the form of heat or kinetic energy. The thermal efficiency of most automotive engines ranges between 30% to 38%, and the engine's thermal efficiency is primarily determined by its fuel injection system.
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How to Release the Parking Brake in an Automatic Transmission Car?

To release the parking brake in an automatic transmission car, follow these steps: 1. After starting the engine, when the driver's side door is closed and the vehicle begins to move, the parking brake will automatically release; 2. With the ignition switch turned on or the engine running, press the brake pedal, first pull the handle backward while pressing the lock button at the end of the handle, then push the handle all the way down to manually release the parking brake. The parking brake, also known as the handbrake or the parking gear in automatic transmission cars, does not require shifting gears while driving. In contrast, manual transmission cars require timely gear shifting to adjust vehicle speed and engine torque changes.
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What are the body dimensions of the Kia KX7?

The body dimensions of the Kia KX7 are 4730mm in length, 1890mm in width, and 1730mm in height, with a wheelbase of 2700mm. The Kia KX7 is a mid-size SUV under Dongfeng Yueda Kia, featuring a MacPherson independent front suspension and a multi-link independent rear suspension. The Kia KX7 adopts the brand's signature 'Tiger Nose' front grille design. In terms of power, it is equipped with three engine options: a 2.0L, a 2.4L, and a 2.0T engine, paired with a 6-speed automatic transmission. Some models also come with a four-wheel-drive system and offer both 5-seat and 7-seat configurations.
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What is a Pickup Truck?

A pickup truck is a light-duty cargo vehicle featuring an open cargo bed behind the cab, with the side panels of the cargo area integrated into the cab structure. It combines the comfort of a sedan with a rear cargo compartment, serving as a dual-purpose passenger-cargo vehicle and constituting a significant segment of the automotive market. Pickup trucks are characterized by sedan-like comfort, robust power, and superior cargo capacity and off-road capability compared to sedans. From a technical perspective, pickups can be categorized into Japanese models (Toyota series, Nissan series, Isuzu series, Mazda series, etc.) and American models (GM series, Ford series, etc.). In terms of product grade, they are classified into high-end, mid-range, and entry-level tiers. Structurally, they include standard double-cab pickups, extended-wheelbase large double-cab pickups with lengthened cargo beds, extended-cab pickups, mid-size double-cab pickups, heavy-duty single-cab and compact single-cab pickups primarily designed for cargo, and van-style pickups (i.e., multi-purpose off-road vehicles or economy SUVs).
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What to Do If 92 and 95 Gasoline Are Mixed?

Here are the solutions for adding the wrong gasoline: If the gasoline added has a higher octane rating than the car requires, for example, adding 95 when 92 is specified, you can simply consume it normally and then switch back to 92 gasoline afterward. If the gasoline added has a lower octane rating than required, such as adding 92 when 95 is specified, you only need to add a high anti-knock fuel additive. Of course, you can also directly drain the fuel and refill with 95 gasoline. To find out which gasoline your car requires, you can check the car's user manual or the fuel cap for the specified octane rating. 92 and 95 gasoline should not be mixed because they have different iso-octane contents. 92 gasoline is suitable for low-compression engines, while 95 gasoline is suitable for high-compression engines. If 92 gasoline is added to a car that requires 95, it may cause abnormal combustion, leading to knocking. Knocking not only damages the combustion chamber but also directly affects the engine's normal operation, potentially causing severe engine damage. Conversely, adding 95 gasoline to a car that requires 92 will not damage the engine, but 95 gasoline is more expensive, leading to unnecessary waste. Differences between 92, 95, and 98 gasoline: Standard gasoline consists of iso-octane and n-heptane. Iso-octane has good anti-knock properties, with an octane rating of 100, while n-heptane has poor anti-knock properties and is prone to knocking in gasoline engines, with an octane rating of 0. If gasoline is labeled 92, it means it has the same anti-knock properties as standard gasoline containing 92% iso-octane and 8% n-heptane. The same principle applies to 95 and 98 gasoline.
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Can Scratched Wheel Hubs Be Repaired?

Scratched wheel hubs can be repaired using the following methods: 1. First, use adhesive tape to cover the undamaged areas to prevent accidental paint application on unaffected parts; 2. After trimming the brush tip, apply touch-up paint. When the paint dries and slightly contracts, it is recommended to apply it slightly raised for easier observation; 3. After painting, wait approximately one week for complete drying. Once dry, use waterproof paper soaked in soapy water to smooth the surface; 4. After wiping with waterproof paper, use a polishing compound to restore shine, followed by waxing. The wheel hub is the cylindrical metal component inside the tire that supports it, mounted centrally on the axle, also known as the rim, steel ring, or wheel. Wheel hubs come in various types based on diameter, width, manufacturing method, and material.
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What is the wheelbase of the Kia VQ?

The wheelbase of the Kia VQ is 3020mm, with overall dimensions of 5130mm in length, 1985mm in width, and 1815mm in height, making it an MPV model. In terms of powertrain, the Kia VQ is equipped with two engine options: a 2.2-liter turbocharged diesel engine and a 2.7-liter naturally aspirated gasoline engine. For passive safety, the Kia VQ comes with six airbags, three-point seat belts, and a safety warning system. In terms of active safety, it features a VRS (Vehicle Stability Management) system, with a MacPherson strut independent suspension at the front and a multi-link non-independent suspension at the rear.
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