[s-cars] Coolant Heresy?

[Igor Kessel]

Bill Mahoney wrote:
> The only coolant that works for our cars is the Audi OEM coolant.
> That said, has anyone ever considered Evans NPG+ Racing Coolant?
> http://www.evanscooling.com/main31.htm
> Supposedly it was used in the Sprongel S2 rally car.  In comparing boiling
> point vs oem, boiling point is about 100 degrees F higher; about 370 vs 270
> for the oem coolant.
> My take is that it may create better detonation.
> Geniuses?
> Bill m
>
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Bill,
I believe Sprongl runs a 10v engine in his S2. I myself had successfully
run 100% Evans in my '89 200TQ with the 10v engine. I liked it a lot.
Especially the zero-pressure feature. Pulling up into a gas station in
the summertime and undoing the cap on the expansion reservoir with the
scorching hot engine before the astounded attendant who was about to
duck - priceless!

Alas, Evans does not look like a viable option in the AAN, and possibly
in the 3B too. The trouble is the water pump fails to move the denser
Propylene Glycol coolant and the radiator passages are also too fine for
it to move. Those who tried Evans in our cars lost water pumps radiators
and had eventually scrapped the idea.

I replace the coolant every two years and I currently have the red
Pentosin (G12 I believe) in my car in a 40% antifreeze/60% distilled
water solution. Since the cooling efficiency in the UrS is a huge
improvement over the type 44 with a tiny, cramped sideways in the corner
radiator, I see no need in adding any cooling efficiency or reducing the
pressure. In the type 44 the pressure used to play nasty tricks like
break off the upper radiator nipples. In the C4 chassis this is no
longer the case.

--
Igor Kessel
two turbo quattros