best coolant mixture

["Dean W. Cains" <dwc@xxxxxx>]

Hi Group:

So, exactly what is the best mixture of coolant and water that will 
optimize heat transfer while still offering corrosion protection?  That's 
assuming one is in a non-freezing climate.  I just received a reply from a 
"Lubrication Engineer" at ChevronTexaco North America LubeTek, and have 
pasted it below:

**********
The higher the water % the better the heat transfer. Your car recommends
50/50 coolant to antifreeze. 55% water 45% coolant would be a safe ratio
and give you the maximum heat transfer.
**********

I'm guessing that 55/45 water/coolant wouldn't be the "best" for heat 
transfer, would it?  I wasn't able to contact anyone that is specifically 
in the Dex-Cool division, but I'd like to know if perhaps 75/25 
water/coolant would offer enough corrosion protection.  The factory shop 
manual for my '87 Spider even recommends pure water for Summer usage, which 
I don't think I'd be comfortable with.  Any real coolant engineers out 
there?  Should I just buy that '73 911 Carrera I've always wanted?

Regards,

Dean
Lutz, FL
'74 & '87 Spider Veloce's
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