Quote:
Originally Posted by Billy Mild
Has anyone tried running evan's coolant? It uses no pressure as a coolant. I know some guys in the 2 stroke world and turbocharged world swear by it. There are power gains as well as less stress on components from it. It is not corrosive either.
http://www.evanscooling.com/ |
The Evans coolant is a waterless liquid with an approx. 356°F boiling point at 1 BAR (14.7 psi) natural atmospheric pressure at STP(Standard Temp and Pressure-equivalent to driving around without a rad cap, thus allowing no cooling system pressure to build). It's mostly Propylene glycol.
Good thing about Propylene glycol is that its many times less toxic than the conventional Ethylene Glycol coolants. Its generally regarded as safe for canines and other pets. (by no means should this relax safety around pets and children, Evans coolant is not pure PG when new, and would be regarded as contaminated after a service interval in an LT5 or any other engine. But if my dog accidentally ingested a coolant, I would rather it be Evans.)
So safe in fact that many of the intravenous and Intramuscular medications that I give to people use Propylene Glycol as a diluent for meds that do NOT dissolve in water. PG is also used to carry the nicotine and flavours in the "juice" that smokers use in electronic cigarettes.
Because of its higher no pressure boiling point, nucleate boiling is prevented. As soon as any liquid boils, the resultant vapour or gas drastically reduces heat transfer from the metal into the liquid.
Think of nucleate boiling as the small bubbles that occur on the bottom of a pot of water on the stove. Water boils at 212ºF, and although the entire pot of water may not be 212º, the liquid temps right along the bottom of the pot are high enough to boil.
It is important to note that both Propylene and Ethylene Glycols are corrosive to metals when exposed to air/oxygen if not mixed with inhibiter.
Air cools rad fins, rad cools coolant, coolant cools engine, its all about thermodynamics.
EDIT: I simply concentrated of one aspect of the Evans cooling "system", there are many other advantages other than just the boiling point and low toxicity)