When water is employed in an engine coolant, in high performance engines the flow is usually restricted. The theory being, "slow the water down so that it has time to cool off in the radiator." This is an inaccurate response to the use of a poor coolant.
To limit boil over higher pressure is required to raise the vapor point of the water to try to keep the cylinder head cool. When a restrictor is placed in the flow path, the system pressure increases and thus, the boiling point.
It is not uncommon for some race engines to see pressures as high as 60 psi or greater in the rear of the cylinder head because of the use of a flow restrictor. The engine builder would generally think that they were controlling heat by reducing flow but in actuality were creating such high pressure to make up for the deficiencies of water as a coolant, even when treated with chemicals that are suppose to enhance its ability. What is usually not taken into consideration is the added horsepower required to drive the water against 60 psi of pressure that the restrictor created.
This is all an effort to make up for the poor qualities of water as a coolant in anything other than an engine that is going to idle or run at minimum power.
When using Evans Waterless Engine Coolant in a high horsepower engine, the cooling system can remain free of any restriction. No need to restrict flow through your radiator, in fact, Evans prefers flow. Any restriction will cause Evans to sit in the engine longer absorbing more and more heat, the quicker Evans gets to the radiator to dissipate the heat, the better.
In addition, due to the already high boiling point (190C), Evans Coolants requires no additional system pressure. Overall system pressure will actually reduce to very low levels due to the absence of steam.
For more information visit www.evanscoolants.com.au