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Old 06-25-2007, 06:20 AM
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water anti freeze with aluminum heads

What water anti freeze mix should I use with aluminum heads. somebody told me to only use distilled water. What is everyone else using?

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Old 06-25-2007, 08:12 AM
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Same mix as iron heads, 50/50. It's always a good idea to used distilled water.
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Old 06-25-2007, 12:45 PM
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Quote:
Originally Posted by RPM
What water anti freeze mix should I use with aluminum heads. somebody told me to only use distilled water. What is everyone else using?
My preference with aluminum is to run 100% propylene glycol based anti-freeze, for an engine that is not pushing ultimate compression ratios over 10 to 1 and operated mostly to exclusively on the street. The reasons are that water, any water, in the coolant reacts as an electrolyte between the different metals it contacts. This becomes essentially a plating solution removing the more reactive metal, in this case aluminum, plating it onto the less reactive metal i.e. cast iron. Aluminum passes heat faster than cast iron and, therefore, can tolerate a coolant with a slower heat transfer rate compared to water; assuming the rest of the cooling system especially the radiator is up to spec.

This is where the OEMs have moved to for the same reasons as stated above.

Bogie
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Old 06-25-2007, 03:55 PM
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Quote:
Originally Posted by oldbogie
My preference with aluminum is to run 100% propylene glycol based anti-freeze, for an engine that is not pushing ultimate compression ratios over 10 to 1 and operated mostly to exclusively on the street. The reasons are that water, any water, in the coolant reacts as an electrolyte between the different metals it contacts. This becomes essentially a plating solution removing the more reactive metal, in this case aluminum, plating it onto the less reactive metal i.e. cast iron. Aluminum passes heat faster than cast iron and, therefore, can tolerate a coolant with a slower heat transfer rate compared to water; assuming the rest of the cooling system especially the radiator is up to spec.

This is where the OEMs have moved to for the same reasons as stated above.

Bogie
It is all brand new, and the motor has a 6-71 blower on it so the compression is 8-1. Has a new Griffin aluminum radiator also.
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Old 06-25-2007, 04:02 PM
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New vehicles have been coming with a 50/50 mix of coolant with aluminum engine parts with no ill effects for years. Most any manufacturer recommends a 50/50 mix. All coolant today comes with anti corrosion, anti rust additives. For the best heat transfer through your radiator a 50/50 mix is optimal. I concur on using distilled water or you can purchase a 50/50 mix already in the container.

Vince
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Old 02-01-2008, 04:40 PM
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I'm going to add a sacrificial anode.

http://store.summitracing.com/partde...part=FLX-32060

BBP
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Old 02-01-2008, 05:30 PM
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pure antifreeze is not a good thing in cold climates!
http://www.gi.alaska.edu/ScienceForum/ASF6/680.html
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Old 02-01-2008, 06:29 PM
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Quote:
Originally Posted by RPM
It is all brand new, and the motor has a 6-71 blower on it so the compression is 8-1. Has a new Griffin aluminum radiator also.

Go look at this web spot http://www.evanscooling.com/

This is the guy that GM had a law suits over the LT-1/4 reverse cooling. They brought hin in as a consultant, then stiffed him on financial compensation.

Bogie
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Old 02-05-2008, 12:21 PM
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I'm considering using 100% propylene glycol antifreeze in my new engine with aluminum heads (it still has about 5% water in it, from what I've found in the spec. sheets so far).

100% propylene glycol, freezes at -74F, boils at 370F

Ethylene glycol has a strange freezing point curve, if you increase past 60% mixture, it freezes at warmer temperatures up to only about -10F at 100%


http://www.raypak.com/afreeze.htm

Since glycols are more viscous and less thermally efficient than pure water, pump selection must account for changes in heat transfer fluid performance.

IE.

At 180F a 50/50 propylene glycol mix will:

Reduce the Heat transfer by about 10% at the same flow rate. (3% better than ethylene glycol)

and, because of its higher viscosity, the pump head must be increased by 23% to keep the same flow rate. (same as with ethylene glycol)

I haven't found the 100% propylene glycol antifreeze data, but looking at the trends, I will guess that I will need about 50% more air flow and antifreeze flow.

Adding an oil cooler & transmission cooler will be required (I think).

BBP
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Old 02-05-2008, 01:17 PM
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So what's being said is, unless you wanna redesign the entire cooling system, use a 50/50 mix using distilled water or a premix........
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