NEWSLETTER - HEAT SOAK EFFECT ON ENGINES

With a long hot summer forecast your engine could suffer much undue stress in the coming months.

Your engine temperature is controlled via the cooling system with interplay between heat produced, speed of the water pump and engine cooling fan all controlled by a thermostat. When the engine is switched OFF, the cooling system becomes inactive and the residual heat in the engine from the block, head and exhaust manifold are transferred to the coolant and other engine components. The engine temperature actually increases after a hot engine shutdown. This is called ‘after-boil’ or ‘heat-soak’ and can seriously damage water-cooled engines and in some cases, blowing a head gasket.

As the following graph shows, the typical effect of a conventional cooling system is that over a long period the coolant is almost at boiling point until natural convection and radiation eventually brings the engine and coolant system back to ambient.

For an intelligent cooling system, an Electric Water Pump and electric Thematic Fan can be controlled by engine temperature irrespective of whether the engine is OFF or ON. The effects of ‘heat soak’ are washed away in seconds as the cooling system continues to do its job whilst the engine is OFF.

To overcome damaging ‘heat soak’ in your engine we recommend the combination of the Davies, Craig Thermatic Fan, Electric Water Pump (EWP) and a EWP/Fan Digital Controller. 
 
 

For further information contact; John F Benson, Sales & Marketing Manager
T: +61 3 9369 1234; F: +61 3 9369 3456; M: 0418 130 600; E; johnb@daviescraig.com.au
Or, visit our website: www.daviescraig.com.au