IMPORTANT

Carefully review all of "Important" Page 6 about water contamination, draining & flushing

Step 2.  Remove the existing pump and radiator, and replace with EVANS NPG parts.

Step 3.  Use either the cross or vertical flow system installation per "Basic System" Page 9 through 17. Be sure to remove the thermostat completely for race car applications.

Step 4.  DO NOT USE AN ENGINE OUTLET FLOW RESTRICTOR!  Unlike conventional water cooling, the EVANS System uses as much flow as possible. Minimum line sizes are 1 3/4" pump inlet and 1 1/2", or double-16 AN (braided hose) engine outlet to the radiator See What to Expect on page 3.

Step 5.  The EVANS NPG Pump plugs any coolant-pump thermostat bypass, if so equipped. These are usually 5/16" or 3/8" OE passages in the block and head connecting the pump to the head and bypassing the radiator.

Step 6.  Thermostat conversion: Race car - remove completely, Street car - install EVANS type (see Page 11).

Step 7.  If conversion has been made from a system previously filled with water, it must be "hot purged" (see Page 22).

Step 8.  Whenever operating an engine at higher horsepower, compression, turbo boost or load, the engine oil temperature must be controlled and kept to a maximum of 250°F by using an oil cooler.

A common misconception is that the EVANS NPG Cooling System will operate hotter than water-based cooling systems. With a properly installed system, using the recommended EVANS NPG pump and radiator with nothing else changed, the system will operate at the same temperature or often at a slightly lower temperature compared with a system operated on water-based coolant. However, if a major change is made to the fuel mixture or to increase compression, horsepower, or turbo boost, the system will operate hotter due to the higher output of the engine. These same changes, operating the engine at limits beyond conventional cooling capabilities, would cause a conventional cooling system to run excessively hot, overheat and fail. The EVANS NPG Cooling System will continue to operate, FAILURE FREE at that higher temperature (up to 290°F) without engine damage. 600 HP racing engines have been tested at 16 to 1 compression running at coolant temperatures as high as 300°F with no engine damage. However; whenever operating an engine at high coolant temperatures the oil temperature must be controlled and kept to a maximum of 250°F, by using an oil cooler.

NOTE:

Repetitive testing of radiators has shown that far greater radiator efficiency is achieved with the EVANS NPG radiator. The less dense high flow Evans radiator with two specialized wide tubes per row and custom tailored fins per inch, will significantly outperform standard radiators normally used today.

HOT-PURGING OF RESIDUAL WATER FROM COOLANT AFTER INSTALLATION:

After the initial conversion from the conventional water based system, residual water often remains in the engine. To purge, first drain the expansion tank, if high mounted, then disconnect the vent line from the inlet side (toward the engine/radiator). Using an additional hose, temporarily connect the separated portion of the vent hose to a high point (such as the raised hood) and lead remainder of the hose to the ground. Cover the front of the radiator with a fender cover or cardboard to block the flow of the air through the radiator core. Start the engine and warm up to approximately 280°F at idle speed.

If your vehicle does not have a gauge which reads 280°F, then use a thermocouple or a simple metal (probe-type) oven thermometer. Best method is to loosen a hose clamp, slide the thermometer probe under the hose until it contacts coolant, then tighten the clamp. An alternate method is to tightly wrap the probe of the thermometer to the hose.

CAUTION

Residual water, if present, will vent rapidly from the vent line as steam (water vapor). Be certain no one is near the vent line during the initial purge of such water vapor.

NOTE:  If there are trace amounts of water remaining in the system, idling the engine at 280°F will cause only water vapor in the form of steam, not coolant, to blow out of the vent line.

Proceed as follows:

Step 1.  If steam (water vapor) does appear, continue idling engine. Maintain 280°F by alternately removing and applying the cover which blocks the radiator core, until venting stops.

NOTE:  280°F is a safe coolant temperature with EVANS NPG Cooling Systems and engine will not be damaged Race engines with 600 HP have been tested to 300°F, with no damage.

Step 2.  Should violent venting occur (steam with visible amount of liquid coolant), this indicates a large volume of water remaining in the system. The engine should be turned off each time the venting is violent, allowed to cool down, and the system topped off with coolant. The engine is cycled again to 280°F and then shut off until the venting is controlled, i.e. no coolant is discharged.

Step 3. Water is adequately purged when coolant remains quiet (no boiling or venting) at idle and temperature of coolant is 280°F

Step 4.  After complete cool down, reconnect the vent line to the EVANS Expansion Tank repeating procedures of steps 7 through 11, page 17, for either cross or vertical flow configurations.