[DeTomaso] Radiator Update

[Julian Kift]

There are a several factors to consider in choosing optimal anti-freeze blend;
 
1. Climate and required freeze protection - maximum protection -60F at 70/30 anti-freeze to water (pure anti-freeze freezes at +10F)
2. Heat transfer - anti-freeze reduces the specific heat capacity of water and a 50/50 blend reduces it by about 20% so you need to circulate the mixture 20% faster than pure water to get the same heat transfer
3. Corrosion protection - generally 40/60 to 60/40 is accepted as the range for adequate corrosion protection where aluminum components are in use and contact.
 
The atmospheric boiling point of pure ethylene glycol is 387F, but a 60% anti-freeze blend is 232F (only 20 degrees above water), every psi (cap pressure) on your cooling system will raise the boiling point by about 3 degrees (water or anti-freeze). Most of us use a 16 psi cap so even with pure water the boiling point is ~260F.
 
Julian
 
> Date: Wed, 2 Mar 2011 15:54:03 -0500
> From: rob at dumoulins.net
> To: fresnofinches at aol.com
> CC: detomaso at realbig.com
> Subject: Re: [DeTomaso] Radiator Update
> 
> That sounds a bit counter-intuitive. Less anti-freeze means lower boil
> point. Lower boil point means increased chance of steam leading to hot
> spots.
> 
> Although it may increase thermal transfer with less anti-freeze, would it
> not do its job if you really needed it to, say if you have a potential
> overheat?
> On Mar 2, 2011 10:55 AM, "Larry Finch" <fresnofinches at aol.com> wrote:
> >
> >
> >
> >
> > Depending on your climate, you might consider a 1/3 Prestone, 2/3 water
> mix
> > which will cool better, cost you less and still give you freeze protection
> > to 0 deg F.
> > ---------------------
> >
> > FWIW, I had several discussions with Bill at Ron Davis Radiators.
> >
> > He had no 'official' recommendation, but said his choice for street was
> > 1/4 Prestone, 3/4 water. AND to use a bottle of Red Line water wetter.
> > This will protect down to about 10 degrees, which is fine for most of us
> > here in CA.
> >
> > In short, the lower the percentage of anti-freeze, the better the heat
> absorption.
> >
> > Larry
> >
> >
> > _______________________________________________
> >
> > Detomaso Forum Managed by POCA
> >
> > Archive Search Engine Now Available at http://www.realbig.com/detomaso/
> >
> > DeTomaso mailing list
> > DeTomaso at list.realbig.com
> > http://list.realbig.com/mailman/listinfo/detomaso
> _______________________________________________
> 
> Detomaso Forum Managed by POCA
> 
> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
> 
> DeTomaso mailing list
> DeTomaso at list.realbig.com
> http://list.realbig.com/mailman/listinfo/detomaso