![]() ![]() Reduces or eliminates bubbles or vapor barrier that form on hot metal surfaces to reduce coolant temperatures by up to 20° Redline describe their WaterWetter as follows: The surface energy of water is much lower than that of most metal surfaces already, so wetting should not be an issue. The claim that it "doubles the wetting ability of water" seems unconvincing. Seems to have more to do with reducing cavitation than actual wetting. I'm not completely convinced of the mechanism. It's on my list of things to experiment with one of these days. I haven't tried water wetters myself, but I have first-hand reports from folks I trust that have seen 5-10 F° temperature drops. ![]() If I need that much of an increase in boiling point to prevent boilover, I have bigger issues that need to be attended to. I'm not looking to run my engine a LOT hotter - especially the engine on the 51 year old TR3. This is why we normally don't run 100% antifreeze in our systems, and probably one of the reasons my old TR was originally instructed to run with "clean rain water" unless it was frosty. Densities are less than 5% different, so on a volumetric basis water can carry over 60% greater heat. Propylene glycol is about 2.5, ethylene glycol about 2.4. The heat capacity of water is about 4.2 J/cubic cm-K-degree. So much higher boiling for the waterless. The 0 psi boiling point of propylene glycol is 375 F (190 C). That's a thermodynamic fact.įrom info on the interwebs about the Evans waterless coolant it seems to be a blend of ethylene glycol and propylene glycol (that's speculative in part). They do a poorer job of carrying heat away from the cylinders. We've talked about this a lot on the vintage Triumphs list and the TR Register forum.Īn important thing to remember is that although these ethylene and/or propylene glycol-based coolants have significantly higher boiling point than water or water-glycol blends, it comes at a price of lower heat capacity in the fluid.
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