Why Does a Car Engine Sound Louder in Winter Than in Summer?
2 Answers
In winter, the engine often operates with a larger throttle opening to reach its optimal working temperature and power various equipment, resulting in increased noise. Once the equipment operates normally and the engine temperature reaches the standard level, the throttle opening reduces, and the noise decreases accordingly. Models equipped with turbocharged engines tend to produce even louder noises during cold starts. Below is relevant information about engine operation: 1. Starting: After prolonged parking, the engine oil flows back to the oil pan at the bottom of the engine. Therefore, when starting the engine after a long period of inactivity (e.g., overnight), the upper part of the engine lacks oil and lubrication. It takes approximately 30 seconds after starting for the oil pump to circulate oil to critical lubrication points such as the pistons, connecting rods, and crankshaft. However, even if you start driving immediately after ignition, maintaining low-speed operation without aggressive acceleration achieves the same effect as idling. 2. Precautions: It is advisable to warm up the vehicle sufficiently for 2-5 minutes while stationary, avoiding aggressive driving during this period to prevent engine damage. Once the coolant temperature rises to the normal range, the engine speed and noise will naturally return to normal levels.
I've been driving for over thirty years and often encounter louder engine noises in winter. This is mainly because engine oil thickens in low temperatures, like frozen honey, increasing friction during engine operation, which naturally makes the noise louder. Additionally, metal parts contract in cold weather, causing gaps to widen, such as between pistons and cylinder walls, resulting in louder collision sounds. The fan belt also becomes tight and stiff in cold weather, making a flapping noise. Even more annoying is the incomplete combustion of fuel during cold starts, producing loud popping sounds. Remember to switch to antifreeze engine oil before winter to reduce a lot of noise. Warming up the engine for two minutes before driving also helps lower the noise and makes the ride smoother. Cold weather affects older cars more, so a full vehicle maintenance check is essential.
