Fuel Economy Increases by Using Evans Waterless Coolants Proven in Series of Field Tests - Engine Builder Magazine
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Fuel Economy Increases by Using Evans Waterless Coolants Proven in Series of Field Tests

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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.

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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.”

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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
215?F.  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/

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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 230?F, for example, is more than 100?F colder than
HDTC’s boiling point of 375?F, but very close to the failure
temperature of a water-based coolant.”

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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.

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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.”

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