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Fuel Economy Increases by Using Evans Waterless Coolants Proven in Series of Field Tests

Evans Cooling Systems, Inc., developer of the only waterless engine coolant, recently announced results from over a year’s worth of fuel economy testing.

Evans has been testing its waterless Heavy Duty Thermal Coolant (HDTC) in waste vehicles, over the road trucks, and buses, with fuel savings ranging from 3 percent to over 7 percent.

Year-long results from a test with USA Hauling, a CT refuse fleet, showed fuel savings of 7.2 percent.  At Veolia Environmental Services in Wisconsin, an on-going fuel economy test shows a fuel economy improvement of 4.2 percent for the 7 month period through April.  Mike Tourville, Evans Marketing Director, said that he expected the Veolia results to improve further as ambient temperatures get hotter.  The Pioneer Valley Transit Authority in Springfield, MA conducted a year-long evaluation on several city buses and found fuel savings of 4.4 percent.

Tourville said, “In each of these cases, Evans HDTC enabled the fuel saving technique of increasing the temperature at which the radiator fan actuates.  Radiator fans for heavy duty engines draw considerable power while they are running and increasing fan-on temperatures saves fuel because the fans run less frequently.”  He added that “The use of Evans HDTC also enables increasing the engine thermostat temperature for saving fuel, a technique that we proved out at Auburn University.”

The PAVE Research Center at Auburn University conducted an SAE Type II Fuel Consumption Test (J1321) using two Detroit Diesel-powered trucks from its fleet.  The test truck was converted to Evans waterless coolant and its thermostats were replaced with thermostats actuating at 215⁰F.  To remove the fans from being a variable, the fans of both trucks were locked “on” 100% of the time.  The test truck achieved a 3.04 percent improvement in fuel economy over the control truck.  The full report is available at PAVE’s website: http://www.pavetrack.com/PAVE/

According to Tom Light, Chief Engineer for Evans, “Heavy duty engines can avail themselves of fuel saving techniques that involve higher coolant temperatures if the coolant is Evans HDTC because engine metal temperatures remain under control.  There is no vapor to insulate between hot metal and liquid coolant.”  He added that, “Evans HDTC works because of the huge separation

between its operating temperature and its boiling point.  A fan-on temperature of 230⁰F, for example, is more than 100⁰F colder than HDTC’s boiling point of 375⁰F, but very close to the failure temperature of a water-based coolant.”

Important maintenance benefits also depend from Evans HDTC’s very large separation between operating temperature and boiling point.  Results from the John Deere Engine Cavitation Test (now ASTM Test Procedure D-7583) prove that Evans HDTC provides the best protection against cavitation erosion (vibration pitting) of cylinder liners as compared to any other coolant.  (HDTC performed 70% better than the second-best fluid.)  “With HDTC, the coolant is so much colder than its boiling point that vibration doesn’t cause vapor to form and collapse, scrubbing the cylinder liner as is the case with water-based coolants,” Light said.

The pressure in the expansion tank comes solely from heat expansion of the fluid and there is no pressure component from vapor.  If the cap is removed from a hot engine (not a recommended procedure), there is no gusher of hot coolant.  The lower cooling system pressure reduces stress on cooling system plumbing and hoses.  Evans HDTC, if not contaminated with water, will last the life of the engine.

“The fuel economy testing Evans Cooling Systems has completed validates the fuel savings advantages that Evans Heavy Duty Thermal Coolant can deliver for trucking fleets, waste management vehicles, buses, and other heavy duty engine applications,” said Mike Tourville of Evans.  “With the rising cost of fuel, fleets and owner-operators need to find ways to control expenses and, as these tests show, Evans Cooling Systems is helping to improve fuel economy and reduce maintenance costs.”