“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. If you're not and just want to run cooler, get a fan.Enduro and Off-Road riding puts a huge strain on dirt bike cooling systems – this much we know. So, if you're having a boil over problem, try Evans and a higher PSI cap. PG you buy as a coolant has some water in it and this lowers the boiling point and eliminates the whole reason you're considering Evans anyway. So if we believe Evans Waterless Coolant is largely propylene glycol, can't I just buy some PG at the parts store (RV anti-freeze) and use that for a heck of a lot less money? NO. It still runs hotter than before I installed the auto clutch but it has never boiled over again. Now I run Evans Coolant, a 1.6 cap and I replaced that little plastic plug in the top of the left radiator with a metal oil pan plug (had to retap the radiator to match threads). This was compounded by my improper installation of the auto clutch at first and caused boil overs in every race. Why? simple, I added an auto-clutch which makes the bike run hotter due to more clutch slippage. So, if you aren't going to flush out all of the water, don't try the product. That's why they make their "Prep" solution to help you flush out ALL of the old water/coolant. Even the slightest bit, say 1% water, will lower the boiling point of the Evans to the point of wasting your money. BUT, the secret is you MUST, repeat MUST, get ALL the water out of your cooling system first. If you are running your bike so hard that you have a boil over problem (you a pro rider?) OR if you have engine mods that make it run hotter, Evans can help since running hotter is preferable to a complete boil over. It WILL raise the boiling point substantially and avoid boil overs. Evans will NOT make your bike run cooler. Conclusion, largely propylene glycol, probably with some additives. We went around and around on this together trying to figure out what Evans Coolant was and what it does. OK, I'm a retired chemist as is my brother.
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