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Re: Surfactants/Cooling etc...

In a message dated 95-11-04 16:40:17 EST, you write:

>an article in one of the monthlies that said that in non-
>freezing locations nothing worked better to dissipate heat than straight H2O
>with some corrosion inhibitor/water pump lubricant added. It went on to say 
>that antifreeze actually lowered the boiling point,

I have also heard/read that this is true, and further, in a brochure by
Redline, it states (this is given for info purposes only; not a sales
advertisement :-) ):

"Under moderate load conditions, each percent glycol raises cylinder head
temperatures by 1 degree F.  50% glycol raises head temperatures by 45
degrees F.
This increase in temperature will raise the octane required for trace knock
levels by typically 3.5 octane numbers. A car equipped with a knock sensor
will retard the timing to compensate for the increase in octane requirements
by approximately 5 degrees, which will reduce the maximum brake torque by
about 2.1%"

It goes on to also state that a 70% glycol mix increases the cylinder head
temperature by 65 degrees F., retards the timing by 7.5 degrees, and
increases the octane requirement by 5.0!!! WOW!!

Guess what I'm gonna go check.....just to make sure.....!!!

I can speak from experience on this one. I too (like most folks?) thought it
was okay to just add more antifreeze to the tank if it was low... and not add
water... Ya' know, "just top it off".  Then I started to notice the car
(non-Audi) running hotter than usual... Well, after I had heard this tidbit
re: too much coolant, I drained out the radiator and put in a better mixture
(ie more water), and... yep, you guessed it... the temp gauge went down. Back
to normal.

Just thought I'd offer some experience/insight.

Ohhh, and while we are talking coolant etc... anybody have any comments re:
using distilled water vs. tap water in the cooling system? I have heard to
use only distilled water, but never have. The group's feedback?

                    Jim Griffin
                     92 100S
      Titanium Grey/Black Leather

A ccelerate U nless Death is I mminent