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Evans Reports Waterless Coolant Proved Superior in ASTM-Approved Cavitation Test

Evans Waterless Hails Findings of John Deere Coolant Cavitation Test

Evans Cooling Systems hailed the findings of the ASTM D7583 Standard Test Method for the John Deere Coolant Cavitation Test, reporting that its waterless engine coolant achieved results that cannot be matched by any water-based coolant. Evans is the developer of the only commercial waterless engine coolants.

The 250 hour engine dynamometer test, developed to determine the ability of various coolants to resist engine cylinder liner cavitation erosion, was recently approved by ASTM International as a Standard Test Method. Official approval came October 2, 2009, culminating years of coolant testing performed according to the method. Many coolants were tested during the trial period, including Evans Waterless Heavy Duty Thermal Coolant (HDTC). The testing itself is performed by the Southwest Research Institute, an independent, nonprofit applied research and development organization in San Antonio, TX.

Cylinder liner cavitation erosion, the formation of pits that penetrate into cylinder liners from the coolant side, is the most difficult corrosion problem for heavy duty engines. The consequence of cavitation erosion damage can mean a complete rebuild of the engine. Whether cavitation erosion occurs or not depends upon the formulation of the coolant used.

“The establishment of ASTM D7583 is an important milestone for determining how well individual coolants protect against cavitation erosion of cylinder liners, and we’re very pleased to have excelled in this ASTM-approved John Deere Coolant Cavitation Test,” said Thomas Light, Chief Engineer of Evans Cooling Systems. “We believe our coolants’ low count — 21 pits – is lower than any other coolant would achieve.”

Evans Waterless HDTC boils at 375⁰F and protects to below -40⁰F, which is an advantage because HDTC is operated much colder than its boiling point. This is, in contrast to water-based coolants that are all operated close to their boiling points. Cavitation erosion comes from the repeated formation and collapse of coolant vapor, and because it is waterless, HDTC doesn’t create vapor.

Evans HDTC is based on the company’s patented waterless coolant technology, and is designed for vehicles and equipment powered by heavy duty diesel engines. The huge separation between the boiling point of HDTC and its operating temperature permit engines to operate safely at higher than conventional temperatures and enable fuel saving strategies that include higher temperature thermostats and reduced fan-on time.

HDTC is a lifetime coolant that never needs replacement as long as contamination by water is avoided. No coolant maintenance and no SCAs are required. There is less stress on hoses and other plumbing because, with HDTC, the system pressure is lower due to no vapor component.

For more information on Evans waterless coolants, visit the Evans website at

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