Is Lower Engine Temperature Always Better?

[Willie]

Engine temperature is not always better when lower. Here are some key points about engine temperature: 1. When engine temperature is too low: (1) Excessive heat dissipation from cylinder walls reduces gas pressure in cylinders and thermal efficiency, leading to increased fuel consumption. (2) Poor fuel evaporation and atomization results in over-rich mixture and incomplete combustion, increasing fuel consumption. (3) Unburned gasoline enters the crankcase, diluting lubricating oil and accelerating component wear. (4) Low temperature increases lubricant viscosity, reduces fluidity, worsens lubrication, and accelerates bearing wear. 2. When engine temperature is too high: (1) Affects lubrication as high temperature thins oil film, increases friction, and accelerates engine wear. (2) Causes excessive expansion of metal and rubber components, accelerates rubber aging (may even cause direct failure), and creates compression between matched metal parts leading to damage.