![]() Since ROYCO 602 does not react with water, no specialized reclamation equipment is required. In a 250-hour engine dynamometer test, developed to determine the ability of various coolants to resist engine cylinder liner cavitation erosion, waterless coolants were shown to reduce. This coolant fluid is curated in such a way that it does not react with water, resulting in cleaner operating systems and longer component life. Evans waterless coolants have a boiling point above 375F, which means they are far less likely to vaporize when subjected to turbulent pressure changes. ROYCO 602 offers exceptional performance over a wide temperature range. Modern technology additives blended in the fluid provide long term storage stability. ![]() I am far happier with the Evans but everyone has their choice, never once had to top up overflow bottle.ROYCO 602 is a synthetic based fluid composed of a highly branched, compact, and very stable synthetic hydrocarbon known as polyalphaolefin (PAO). Took off one day from Yarrawonga to head back to West Sale via Mansfield & Licola Valleys loaded to max on a 37deg day, full noise climb to 9500agl indicated at 80 kts and the temps never got out of the top of the green (110) oil sat at the same 110. I haven't seen anything on Rotax recommending going back to glycol mix, I used the Evans in my 80hp trike for 5 years with no issues and now the Tecnam (100hp) for well over a year with no issues, wasn't happy with the glycol mix as the cyl temps ran quite low (75) on a 20-25 deg day, flushed the radiator with the Evan flush and filled radiator with Evans and got an instant 30deg rise in cyl temps now run at 95deg as recommended by Rotax (90+). While waterless flies in the face of the previously mentioned more water, more heat transfer idea, Evans’ approach is a little different. PS Agree wrt antifreeze and pets - my brother's cat died after drinking from a puddle of antifreeze/water under his car. Evans Waterless Coolant promotes a waterless coolant product and highlights extremely high (375 F) and low (-40 F) operating temperatures for its product. Heat management is improved as engine component temperatures are. Evans draws more heat from the engine, which may lead to slightly higher coolant gauge temperatures (by 10 to 20 degrees). Benefits: Eliminates corrosion, electrolysis and reduces pump cavitation, lowers system pressure, prevents overheating. Antifreeze Properties: Protects below -40☌. Evans high boiling point virtually eliminates vapor in the engine, ensuring constant liquid-to-metal contact. Collectors Choice Waterless Engine Coolant is for: Modern, classic, vintage gasoline engine and light duty diesel. I also bought a refractometer to check the ratio of glycol to water in the overflow bottle, and it does seem to indicate that the mixture will gradually acquire a slightly higher glycol ratio, (ie the water does gradually reduce), but I just top up occasionally with more 50/50 mix, or even a slightly higher distilled water ratio. The Benefits of Using Evans Waterless Coolant. Hi Alf,I had also read that they then swung back to recommending the 50/50 glycol/water again.We run the 50/50 in our 80hp 912A with no problem. By the way anybody doing coolant changes be VERY careful that your pets never drinks the stuff as it is SWEET but will kill them very quickly from renal failure - My Veterinary tip for the forum one thing I found today was the difference in prices with the Evans propylene glycol waterless being so much more expensive than the 50/50 water based ethylene glycol. At other parts on their own website, Evans says that their product might make your engine run hotter without other components being optimised for the product. Evans coolants eliminate corrosion, prevent boil-over and after-boil, improve combustion and maximise BHP. Hey Keith - yes I agree as new things are developed we need to look at these. Waterless Engine Coolants A range of waterless engine coolants to suit all types of engine cooling system. As yet I have not heard of any coolants failing, organics are there too.Īs I see the subject we must do the new research as things have changed. In a nut shell the process of the coolant is to transfer the heat from the engine to the radiator which dissipates the heat hence coolants must go around and around and continue the process without failure.Even in the mining industry coolants are evolving, for good reference points look at some of coolants as they must transfer great abundance of heat to the outside world. Evans Waterless Coolant has a patented, glycol-based formula that provides excellent protection at high temperatures compared to traditional water-based coolants. ![]() ![]() As I see it the coolant chemistry is changing and this some of the teachings from the radiator shops.
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