Are Cadillac and Buick engines the same?
1 Answers
Cadillac and Buick engines are the same, with the model being LSY. This engine is quite good and features cylinder deactivation technology. An engine is a machine that converts other forms of energy into mechanical energy. Engines can refer to power-generating devices or the entire machine including the power unit (e.g., gasoline engines, aircraft engines). Types include internal combustion engines (such as gasoline engines), external combustion engines (like Stirling engines, steam engines), gas turbines (used in racing cars), and electric motors. Engine working process: intake stroke, compression stroke, power stroke, exhaust stroke. Intake stroke: The working medium entering the cylinder is pure air. Due to the lower resistance in diesel engine intake systems, the intake end pressure pa=(0.85～0.95)p0 is higher than that of gasoline engines. The intake end temperature Ta=300～340K is lower than that of gasoline engines. Compression stroke: Since the compressed working medium is pure air, diesel engines have a higher compression ratio than gasoline engines (typically ε=16～22). The compression end pressure is 3000～5000 kPa, and the compression end temperature is 750～1000K, significantly exceeding the auto-ignition temperature of diesel (about 520K). Power stroke: As the compression stroke nears completion, diesel is injected into the cylinder combustion chamber at a high pressure of around 10MPa via the fuel injector under the action of the high-pressure fuel pump. It mixes with air and spontaneously ignites within a very short time. The gas pressure in the cylinder rises rapidly, reaching a maximum of 5000～9000 kPa, with a peak temperature of 1800～2000K. Since diesel engines rely on compression for ignition, they are called compression-ignition engines. Exhaust stroke: The exhaust process in diesel engines is similar to that in gasoline engines, except that the exhaust temperature is lower. Typically, Tr=700～900K. For single-cylinder engines, the speed is uneven, operation is unstable, and vibration is significant. This is because only one out of the four strokes is a power stroke, while the other three are preparatory strokes that consume power. To address this issue, the flywheel must have sufficient rotational inertia, which in turn increases the overall engine mass and size. Multi-cylinder engines can compensate for these shortcomings. Modern cars commonly use four-cylinder, six-cylinder, and eight-cylinder engines.
