With a focus on high performance engines, Cosworth's thermostat needed to do more than simply open at a lower temperature. Unstable coolant temperatures can lead to engine damage or engine calibration issues, generally caused by an inferior thermostat that does not control the flow of coolant causing coolant surge.

Cosworth LowTemp Motorsport Thermostats are engineered with the optimum temperature range in mind for high performance racing use as it is very easy to over cool the engine by either removing the thermostat completely or using a thermostat that is not designed for the specific application. Additionally, over cooling can cause engine damage by preventing critical engine components from reaching their ideal operating temperature, altering the required clearances for safe operation. Another important feature of Cosworth LowTemp Thermostats compared to other brands is the ability to precisely control the flow of coolant when the valve opens. Inferior brands allow the coolant to surge thereby causing unstable temperatures and even temperature fluctuation that can cause severe engine damage and make it difficult to properly tune or calibrate the engine.