What Causes the Engine Exhaust Pipe to Turn Red?

[DeLillian]

The reasons for the engine exhaust pipe turning red are: 1. Some of the combustible gas in the cylinder enters the exhaust pipe and continues to burn; 2. The air-fuel mixture is too lean, causing the combustion speed of the flammable gas to slow down and delay, continuing to burn during the exhaust stroke; 3. Burning gas rushes into the exhaust pipe, raising the exhaust temperature; 4. The exhaust valve seal is not tight or the valve clearance is too small, allowing burning gas to enter the exhaust pipe and raise its temperature; 5. The fuel injection timing is too late. Additional Information: Methods for maintaining the exhaust pipe include: 1. Avoid driving at high speeds for extended periods with the choke closed; 2. Avoid installing windshields or decorative items in front of the engine and muffler; 3. Reduce prolonged high-speed revving of the engine while stationary.

[JoshuaLynn]

I've driven many long-distance trips and encountered situations where the exhaust pipe turned red, which is a sign of engine overheating. The most common causes are issues with the cooling system, such as a leaking radiator or a malfunctioning fan, preventing heat from dissipating and causing exhaust temperatures to skyrocket. Another reason could be incorrect ignition timing—if the spark is delayed, the air-fuel mixture burns slower, accumulating heat at the exhaust port. An imbalanced air-fuel mixture, either too rich or too lean, can also lead to incomplete combustion, making the exhaust pipe glow red. Prolonged high-speed driving without breaks or a clogged catalytic converter can also contribute. If you notice the exhaust pipe turning red, don't push through—stop immediately and check the coolant and ignition system to prevent engine components from getting damaged by excessive heat.

[MacEliana]

A common issue seen while car tuning is the exhaust pipe turning red, which is generally related to abnormal engine combustion. Delayed ignition causes the flame to spread too far, accumulating heat in the exhaust pipe area. Uneven fuel injection, such as clogged injectors or faulty sensors, and an imbalanced air-fuel mixture also contribute to heat buildup. Additionally, high resistance in the exhaust system, like a clogged or aged catalytic converter, prevents exhaust gases from escaping, leading to a sharp rise in temperature. If the exhaust pipe turns red, it indicates temperatures exceeding 500 degrees Celsius, a dangerous sign that could melt seals or even cause spontaneous combustion. It's recommended to use an OBD device to read fault codes or inspect the spark plugs and visit a repair shop for adjustments as soon as possible.

[LaJayla]

When driving, pay attention to the exhaust pipe turning red, mainly due to overheating and loss of control. It could be caused by insufficient coolant, a stopped fan, late ignition, or even a dirty air filter affecting air intake. If the issue is not resolved, it may lead to exhaust pipe deformation at best, or a fire at worst. In daily maintenance, it's important to regularly check the water temperature and sensors.