iceheart - what aluminum are you using?
pHaestus - THANKS SO MUCH FOR THE INPUT... that may be the answer.... i will have to check the aluminum today to check if there has been pitting or not. (coulda sworn i saw it)
i was reading the TechInfo regarding corrosion about the Redline... and it sounds like you are correct..... now my question is:
DOES THE BLACK FILM REDUCE HEAT TRANSFER? and IS THE ANTI-CORROSION ONLY FOR ALUMINUM? (is it even worth putting in a copper and brass cooling system?)
below is the tech info regarding the corrosion inhibitor of RedLine (i will see if i can find some for PurpleIce)
i think im gonna ask chip why he didn't have any coating on his test!!!
Quote:
CORROSION PROTECTION
Modern automotive engines now use aluminum for heads, radiators, water pump housings, and nearly all hose fittings. These engines require significantly greater corrosion protection than their cast iron counterparts of the past. Aluminum is such an electroactive metal that it requires an impenetrable corrosion inhibitor film to prevent rapid corrosion. Acid neutralization capability is very important. Coolant which has been left in a cooling system for several years has probably become acidic from the oxidation of the glycol to acids. Also, keeping the glycol concentration in the cooling system below 50% will help stability.
Red Line also provides excellent protection from cavitation erosion in the water pump and cylinder head. Localized boiling in the cylinder head forms vapor bubbles which collapse when they come in contact with cooler liquids. This collapse creates tremendous shock waves which removes the inhibitor film from the aluminum surface and can cause catastrophic erosion of the aluminum if the inhibitor does not reform the film quickly. Another problem created by cavitation erosion is the deposition of the removed aluminum as a salt with poor heat transfer properties in the lower temperature radiator tubes. Red Line prevents this corrosion through effective film formation and smaller vapor bubble formation, which has a less violent collapse. Foam control is equally important since entrained air will cause cavitation erosion due to the collapse of foam bubbles. Red Line provides excellent control of foam with water alone and glycol solutions.
Most coolants additives on the market provide only protection for iron and perhaps moderate protection for aluminum. The milky soluble oil types can actually impede heat transfer by wetting the metal surface with oil and this oil can swell and soften rubber coolant hoses. Table 3 shows the many tests which the Red Line formula will satisfy and how it compares to a standard antifreeze.
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