Comparison of Engine Models with Common High-temperature Problems

Engine high temperature is a common fault, and different models have different manifestations, causes, and high incidence scenarios due to differences in design concepts, structural layout, and adaptability to working conditions. The following compares the core characteristics and differences of high temperature problems among three typical models of household passenger cars.

1、 Turbocharged small displacement models: high temperature due to load overload

Turbocharged small displacement models (such as 1.2T and 1.5T) have become the mainstream of household cars due to their efficient power, but high temperature problems are often related to load overload. This type of model enhances power through turbocharging, which generates a large amount of heat during operation. If driving at high speeds, climbing slopes, or under full load for a long time, it can cause a sharp increase in turbine cooling pressure, leading to overall high engine temperature. In addition, its cooling system pipeline is more compact, and the size of the radiator is limited by the vehicle body. When driving at low speeds under congested road conditions, the heat dissipation efficiency further decreases, and abnormal water temperature is prone to occur. High temperatures are commonly manifested as excessively high temperatures at the turbine end and poor coolant circulation, especially in high temperature environments during summer.

2、 Large displacement naturally aspirated models: high temperature due to dual pressure of heat dissipation and load

Large displacement naturally aspirated models (such as 3.0L and above) have smooth power output, but the common problem of high temperature is concentrated in the heat dissipation system and high load adaptability. Its engine cylinder has a large volume, and the total amount of heat generated by combustion is higher than that of small displacement models, requiring higher requirements for the cooling system. If the radiator accumulates dust, the cooling fan malfunctions, or if it is overloaded or dragged for a long time, it is easy to cause heat accumulation. The high temperature of this type of aircraft is often manifested as an overall increase in water temperature, and due to its large weight, the engine load increases when climbing, significantly increasing the risk of high temperature. However, its cooling system design is more redundant, and the probability of high temperature under normal operating conditions is lower than that of turbocharged small displacement models.

3、 Hybrid specific engine: High temperature concentration during start stop and operating condition switching

The dedicated engines of hybrid models (such as 1.0L and 1.5L Atkinson cycle engines) focus on energy conservation, and high temperature common problems are often related to frequent start stop and condition switching. This type of engine often operates in the high-efficiency range, with a much higher start stop frequency than traditional fuel engines. Frequent starts can lead to rapid heat accumulation in a short period of time; At the same time, when switching between oil and electricity, the engine load suddenly changes, and if the cooling system does not respond in a timely manner, local high temperatures are prone to occur. In addition, its cooling system is designed to be compatible with hybrid structures and often adopts a miniaturized design. It has sufficient heat dissipation capacity during high-speed driving, but when it is congested at low speeds or frequently started and stopped, the risk of high temperature increases. Common manifestations include high local temperature in the cylinder head and frequent action of the thermostat.

The common high-temperature problems of the three types of models are closely related to the efficiency of the cooling system and the adaptability of the working conditions, but the causes have their own focuses. Car owners need to carry out targeted maintenance according to the characteristics of the vehicle model, such as avoiding long-term overload for turbocharged models, regularly cleaning the radiator for large displacement models, and paying attention to the response status of the cooling system for hybrid models in order to effectively avoid high-temperature faults.