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Water has been assigned a value of 1.0 as a cooling medium. Using water as the standard, anti-freeze has a cooling value of 0.6. This means that anti-freeze is only 60% as efficient at transferring heat as water is. What this means is that a 50-50 mix is not as efficient as straight water. In point of fact, is only 80% as efficient. And MG's tend to run hot in Arizona summers. (As an interesting side light, Colin Campbell's book, "The Sports Car Engine" gives advise on how to set up the cooling system so it will run cool in everything but "Arizona Summers". This book was written back in the mid-60s, so our problems have long been known.) The formula to figure out the cooling system efficiency is percent water X 1.0 plus percent antifreeze X 0.6 to equal the cooling system efficiency. ( .50 x 1.0=.50 plus .50 x 0.6= .30 equals 80% system effectiveness.) I recommend (and use) 75% water and 25% anti-freeze which results in 90% system effectiveness. (.75 x 1.0 = .75 plus .25 x 0.6= .15 equals .90% system effectiveness.) If you add a bottle of Water Wetter to this, you have about as effective a coolant as you can find which will still provide adequate rust protection, water pump lubrication and proper coolant flow.
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interesting read
- Thread starter richardJr
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Steve_S
Yoda
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I ran pure distilled water for years with very good success. I only started adding coolant again because of it's lubricating and anti-corrosion properties. These days I use about a 75%/25% mix of distilled H20 / coolant and add Water Wetter.
Of course in cold climates you need the coolant / antifreeze to prevent freezing but it doesn't typically get that cold here except for a few nights per winter.
Of course in cold climates you need the coolant / antifreeze to prevent freezing but it doesn't typically get that cold here except for a few nights per winter.
Keoke
Great Pumpkin
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Yes steve thats a good combination.However, I question the unity value for water as used .Does it represent distilled water or hard water.On the other hand, if it won't work in an "Arizona Summer" it is of little value to those that need it most.---Keoke /ubbthreads/images/graemlins/smile.gif
aeronca65t
Great Pumpkin
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I have seen cars where the owners have put excess anti-freeze in the mix under the misguided notion that it will "run cooler". In fact, these cars tend to run hotter (but may not boil over, since the mix has a higher boiling point).
Technically, the themostat should keep a car at a fixed temp, but this doesn't always happen if the cooling system is marginal (the themostat may be running wide open all the time).
For the record, I'm running about 20% anti-freeze in my racer with Water-Wetter and the rest is tap water. Gets changed every year (at least). Also a blanking plate (instead of a themostat) and no cooling fan....normally runs a bit too cool (about 160F) but the cooler temp may benefit the oil temps.
I'm running 50/50 in my street cars.
Technically, the themostat should keep a car at a fixed temp, but this doesn't always happen if the cooling system is marginal (the themostat may be running wide open all the time).
For the record, I'm running about 20% anti-freeze in my racer with Water-Wetter and the rest is tap water. Gets changed every year (at least). Also a blanking plate (instead of a themostat) and no cooling fan....normally runs a bit too cool (about 160F) but the cooler temp may benefit the oil temps.
I'm running 50/50 in my street cars.
thank you gentlemen... one of the most misunderstood things about the cooling system is the coolant it's self. so many think ,'if i add all this coolant my car will run cool" which we know is somewhat misleading. that was not my wording but something i found in my travels thru the web. I wanted to throw this in the mix so people could read something interesting and get a grasp on what coolant is really designed for. I was happy to see you pros chime in with some reasonable replies. you see.. i was once a 60-40 guy...{laughing at self and you may jump in if you wish}the ding bell light finally went off and I actually asked some questions. I hope those that were having cooling problems found some sound advice in your words.