Addressing combustion chamber temperature

The job of the liquid coolant is to cool the engine and the task of the radiator is to cool the liquid coolant. The cooling system of a high-powered engine is only as good as the coolant employed.

Traditional water-based coolant (50/50 ethylene glycol and water), though the industry standard for almost 100 years, is not the best medium to use for heat transfer in an engine. Water under atmospheric pressure boils at 100 degrees C (for every one psi increase in pressure from the radiator cap the boiling point increases approximately 1.6 degrees C). A 15 psi cap and 50/50 anti-freeze has a typical boiling point of approximately 125 degrees C. 

The problem is the surface temperature of the combustion chamber and around the exhaust valve will see temperatures well above the boiling point of traditional coolant. With water-based coolant that boils at typically 125 degrees C the heat has no where to go but into the cylinder head casting, valve stem and guide and anywhere else that will accept it.  If the metal surface temperature is climbing and the coolant cannot remove heat it can lead to detonation (ping) and engine failure. The most effective coolant has the ability to absorb a high amount of heat to produce the lowest temperature in the cylinder head.

 Evans Chemistry

The Evans Waterless Engine Coolant is a formula that uses no water at all – so corrosion is totally eliminated. 

The Evans advantage is that it does not boil until 190 degrees C. This high boiling point is responsible for a drastic drop in the metal surface temperature of the combustion chamber over traditional coolant when the engines is running, and also during heat soak after shut-off. Since it refrains from boiling more heat transfer occurs.

It has a lower surface tension than traditional coolant so it releases from the water jacket with less pressure. This allows fresh coolant to come in contact with the region. Due to the unique chemistry the system operating pressure is much lower. Evans does not expand at the same rate as conventional coolants nor does it ever freeze.

Evans allows for a more aggressive fuel mixture and ignition curve and a higher compression ratio since heat- induced detonation will likely be eliminated.  The coolant provides more consistent performance in any high performance application.

To convert from traditional coolant to the Evans all that is required is the complete removal of the old coolant and refilled with the Evans product. The Evans’ website goes over the procedure in great detail. (www.evanscoolants.com.au)