How to distinguish between the three-cylinder and four-cylinder engines in the BMW X1?
2 Answers
BMW X1 three-cylinder and four-cylinder engines differ in terms of balance, with the four-cylinder being relatively more stable. Here is more information about engines: 1. Engine: An engine is a machine that converts other forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, electric motors, etc. Engines can refer to both the power generation device and the entire machine including the power unit. The original meaning of an engine refers to a "mechanical device that generates power." 2. External Combustion Engine: Its fuel burns outside the engine, invented in 1816 by R. Stirling of Scotland, hence also known as the Stirling engine. The engine converts the thermal energy generated by this combustion into kinetic energy. The steam engine improved by Watt is a typical example of an external combustion engine. When a large amount of coal burns to produce heat that turns water into a large amount of steam, high pressure is generated, which then drives mechanical work, completing the conversion of thermal energy into kinetic energy.
The most practical way to buy a used BMW X1 is to check the exhaust pipes and steering wheel feel! My car is the 2019 20Li four-cylinder version, with a single-side dual-exhaust design (two exhaust outlets on the left), and the 20Li badge on the right side of the rear is proof. If it's the 18Li three-cylinder version, the exhaust pipe only has a single-side single outlet (one exhaust outlet on the left). The difference is even more noticeable during a cold start: in summer, when starting in a parking lot, the steering wheel of the three-cylinder car shakes violently—you can feel the vibration from your fingers to your arms, and a phone placed on the dashboard will dance; the four-cylinder version just hums lightly a couple of times and then stabilizes. I recommend you test drive both versions directly, putting them in D gear and holding the brake for the most accurate experience.