“However, other manufactures also recommend a thorough flush prior to any coolant swap to avoid cross contamination. The draining process is a little more involved too, as a deliberate effort must be made to ensure the removal of water-based coolant. “The price point can be a bit discouraging for some users (Evans Powersports Coolant is $29.95 for half a gallon), but the long term advantages usually outweigh that cost. This prevents metal temps from spiking out of control.” OK, great, but are there any downsides? Evans can help manage metal temperatures and eliminate the risk of damage because the coolant remains in a liquid state. “If you put a head in an oven and heat it up evenly, it won’t warp regardless of how hot you get it. With the metal temperature on that side going up so much compared to the cooler intake side, the head warps. Whether it’s a two-stroke or four-stroke, boiling will start on the exhaust side of the cylinder head because that’s where it’s the hottest. This is again a function of steam in the cooling passages. “Head gasket failure happens when the head warps a little and the torqued pressure on the mating surfaces becomes uneven. What happens when temperature get too high? At 230F, or even higher, Evans remains in its liquid state, always allowing the metals to dissipate heat and keep the metal temperatures under control.” These are the hot spots that cause detonation.

The steam inside the cooling passages pushes liquid coolant away from the metal, causing temperatures to spike by hundreds of degrees. “The metal in the engine can withstand a 10 degree rise in temperatures, but that’s all it takes to push the antifreeze past its boiling point. If they see 220F, things are fine, but if it goes to 230F all of a sudden there’s steam coming out, the engine’s detonating, and generally running poorly. When people talk about their “engine temperature”, most likely they’re referring to their coolant temperature. John Light: “The boiling point of a coolant is really its failure point. Here’s what Evans’ Powersports Director John Light had to say when we called for a quick chat… First things first, why is a high boiling point so important? A product that’s been on Enduro21’s radar for some time, we decided to find out a little more about the high-boiling point, anti-freeze, anti-corrosion fluid that claims to last the lifetime of the engine. And, as many of us know only too well, the consequences of boiling a bike over are never good.Įvans Waterless Coolant claims to remove the stress associated with over-heating your engine. From radiators caked with mud during three-hour cross-country races to clutch-frying, uphill climbs in an extreme enduro, we sure ask a lot of our engines. Enduro and Off-Road riding puts a huge strain on dirt bike cooling systems – this much we know.

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