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The optimum coolant temperature for maximum engine power is generally considered to be around 70°C.
When the coolant temperature exceeds 70°C, the intake air temperature rises, causing engine output to decrease due to changes in volumetric efficiency. This is because the engine control computer is programmed to retard ignition timing to help prevent detonation (knocking).
VTEC engines are designed to operate at relatively high coolant temperatures, primarily to comply with emissions regulations and improve fuel economy.
This low-temperature thermostat features a flow control valve that varies coolant flow to help prevent rapid temperature fluctuations (water temperature hunting).
Thermostat opening temperature: 68°C (154°F).
