[Diy_efi] RE: Timing and dyno pulls

[Mike]

At 08:41 PM 24/12/2002 -0700, you wrote:
>I've seen that stuff before, sounds too good to be true... What I'm
>wondering is,
>
>a) Why don't OEMs use it? Many less plumbing-related failures seems
>tempting.

mmm, Probably issue of cost of the fluid (in that the margins
are likely to be less in comaprison) *and* the higher viscosity
may mean higher loads on the pump and less power - I dont see how
they can claim more power as the viscosity of the product is 10 times
greater than water from their own table. Also, what happens if
there is a head failure and causes hose to burst spraying this in
the engine bay - chemical damage ? Is it flammible ?

>b) They say it pulls heat away from the head better, how about from the
>coolant -> radiator? If coolant temps can be kept higher, that would
>certainly help.

The nucleate boiling issue may be the only key issue all else being
equal, in that case - why not run higher pressures with an active
system to keep the pressure up.

A friend of mine, replaced the water in his Ford Laser with 100%
ethylene glycol, had it burst and sprayed it all over his engine
bay with all sorts of connector/cable problems thereafter :(
I know this stuff is Propylene Glycol, but whats the effect on
vinyls, plastics and the like ?

rgds

Mike



>
>I'm not familar with thermal transfer in liquids, is thermal conductivity a
>big issue like it is in heat sinks, or are viscosity and surface tension
>more important? I'm wonding if you need to increase thermostat temp. to get
>the same heat rejected thru the radiator.
>
>http://www.evanscooling.com/main20.htm
>
>I can see why it might need a high flow water pump with its lower specific
>heat
>
>Grant Beaty
>
>----- Original Message -----
From: <Djfreggens at aol.com>
>To: <diy_efi at diy-efi.org>
>Sent: Tuesday, December 24, 2002 7:01 PM
>Subject: Re: [Diy_efi] RE: Timing and dyno pulls
>
>
>> <PRE>try using evans npg coolants. awesome stuff. www.evanscooling.com is
>the web
>> adress.
>>
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