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COOLANT  | Evans NPG Coolant will transfer 27.5% more heat energy than water in your race engine, due to NPG's molar heat of vaporization and high saturation temperature. | | Evans NPG is the best choice for racing engines.
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WATER PUMPS | Evans Performance Pumps have the highest GPM flow rate, lowest drag of any pumps available.
. | | Evans Small Block and Big Block Chevrolet pumps features a 4.4" O.D. impeller.
. | | Other high flow pumps are possible alternatives, pump speed increases could be necessary.
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PUMP SPEED | Coolant pumps reach maximum GPM flow by approximately 4500 rpm.
. | | Keep your pump speed between 4500 rpm and 6500 rpm for maximum flow and lowest drag.
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RADIATORS | Design a radiator best suited for your application - Call Evans Technical Support.
. | | Aluminum large tube radiators work best, core type determined by HP and application.
. | | Air management can be used to control system temperatures and aerodynamics.
. | | Cross flow designs work best, double pass designs are not recommended due to flow restriction.
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RADIATOR CAPS | A 7lb. cap is recommended when using Evans NPG to seal the system.
. | | Evans NPG will work at zero pressure with an expansion tank.
. | | Never put the cap in the upper hose or thermostat housing which is the high pressure side of the system.
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THERMOSTATS & FLOW RESTRICTORS | Not needed, they reduce the coolant GPM flow through the engine and radiator.
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EXPANSION TANKS | Expansion or "surge" tanks work well as a fill point & location of your pressure cap.
. | | Expansion tanks must always be plumbed into the suction side of the cooling system, (lower hose, pump inlet, radiator tank).
. | | Evans NPG uses a 7 lb. cap maximum.
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HOSES | Hoses should not restrict coolant flow.
. | | Upper hose should be a minimum of 1 1/2" I.D., 1 3/4" I.D. recommended.
. | | Lower hose should be at least 1 3/4" I.D. metal tubing or reinforced suction hose.
. | | Hoses with loose springs should have them clamped or tie wrapped in place.
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EXTERNAL LINES | Very useful.
. | | They are used to change the distribution to lower the metal temperature in problem areas.
. | | Lines from the back of the intake to the thermostat housing and inlet hoses from the pump to the block or cylinder head are beneficial. They do not add to the overall GPM flow though the engine. |
AIR BLEEDS (depends on component location) | Air bleeds help remove air trapped in your cooling system.
. | | Evans uses an air bleed in all coolant pumps. This allows any air trapped in the impeller cavity to escape ensuring maximum coolant flow at initial start up and continuously through operation. | | Engine or radiator air bleeds purge the components of trapped air.
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FANS | Mechanical pump driven fans draw twice the air CFM as electric fans.
. | | When using a mechanical fan always use a shroud.
. | | Bottom feeder air intake works well with pump driven fans.
. | | Production fans should not be used.
. | | Use electric fans during caution laps.
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