At What Temperature Does a Car Need to Warm Up?
1 Answers
Warming up a car depends on the specific temperature. If the temperature is below -10 degrees Celsius, warm up the car for 1 minute; below -20 degrees Celsius, warm up for 2 minutes; and below -30 degrees Celsius, warm up for 3 minutes. Here are the specific reasons why a car needs to warm up: Vehicle parked for a long time: After being parked for an extended period, the engine oil flows back into the oil pan at the bottom of the engine. Therefore, when starting the engine after a long period of inactivity (such as overnight), the upper part of the engine is without oil and lacks lubrication. It takes about 10 seconds after starting for the oil pump to circulate oil to the parts that need lubrication the most, such as the pistons, connecting rods, and crankshaft. However, even if you start driving immediately after starting the engine, as long as you avoid aggressive acceleration and maintain low-speed operation, the effect is the same as idling. Low temperature in the fuel system: Before the engine reaches its operating temperature, the fuel system cannot effectively vaporize gasoline due to the low temperature. When gasoline is not vaporized and remains in a 'wet' liquid state, it is difficult to ignite and start the engine. At this point, the choke valve comes into play, restricting some air from entering the cylinder to increase the gasoline/air mixture ratio and raise the engine speed to prevent stalling. Once the engine reaches its normal operating temperature, the automatic choke valve will naturally return to its normal state due to mechanical action. For cars with a manual choke valve, it is essential to remember to release the choke valve; otherwise, an excessively high fuel/air mixture ratio will not only waste gasoline and reduce power but also cause incomplete combustion, resulting in black smoke.
