The Polo rad if a very efficient bit of kit back that punches well above its' weight in the late 1970s early 1980s the many F2 and Formula
Atlantic cars used VW Golf Mk1 rads. The key is getting enough airflow through to dump the heat to atmosphere.
Modern engines are designed to run on 50 perecent ethylene glycol antifreeze mix, using ethylene antifreeze is a double edged sword as the mixture
has a lower specific heat capacity by weight but raises the boiling point and is more dense. When compared to pure water the disadvantages and
advantages largely cancel each out. However the standard 50 percent solution is more viscous than water so takes more effort to pump and gives lower
flow rates in the same system.
At atmospheric pressure a 50 percent ethylene glycol coolant boils at 107c .
A 30 percent solution would give more than adequate freeze protection for normal west european winters manufacturers specify a 50 percent solution
as it gives the best combination of properties for cooling as well corrosion protection.
The main viable alternative antifreeze to ethylene glycol is propylene glycol. A 50 perecent Propylene Glycol mixture is generally similar but it
has a higher specific heat capacity is more dense and is more viscous. The boiling point at normal atmospheric pressure for 50% solution is about
105c.
[Edited on 17/2/16 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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