Re: Bob Myers input requested, RE: more heat!

["Fred Munro" <munrof@isys.ca>]

Hi Avi;

    Yes, you are correct - pure water will likely have a higher heat
capacity than the glycol mix. I don't have the heat capacity data handy, but
it is unlikely that there will be a max peak in the heat capacity
curve.Sorry, I was thinking in "Canadian" - the 50:50 mix is the best heat
capacity you can get and still have a shot at having liquid coolant in the
system on those cold winter mornings. I personally run a 60:40 mix to get
the extra freeze protection - we have the odd excursion to -40 up here.
Nothing can ruin your day faster than hitting the highway with a rad full of
slush.

Fred Munro
'91 200q  266k km
-----Original Message-----
From: Avi Meron <avi@cosmoslink.net>
To: Fred Munro <munrof@isys.ca>
Cc: Quattro <quattro@coimbra.ans.net>
Date: Sunday, January 03, 1999 1:51 PM
Subject: Bob Myers input requested, RE: more heat!


>Fred,
>Correct me if I am wrong but the best heat transfer is 100% water. 50/50
>mix, is a bit of a compromise, but acceptable. If I remember my literature
>correct a 20% mixture supposes to be best for corrosion resistance and
>increasing of the boiling point. Of course a low mixture is not a good idea
>for cold weather.
>Bob could you please put your input in this issue?
>Avi
>
>-----Original Message-----
>From: owner-quattro@coimbra.ans.net [mailto:owner-quattro@coimbra.ans.net]
>On Behalf Of Fred Munro
>Sent: Sunday, January 03, 1999 7:08 AM
>To: Huw Powell; Martin Pajak; quattro group
>Subject: Re: more heat!
>
>Huw;
>
>    I've been following your quest for heat and thought I'd throw this into
>the pot in case it applies. If you have too much antifreeze in your coolant
>mix, the heat capacity of the coolant is reduced and you will get less heat
>out of your heater. The best heat transfer is obtained at a 50:50 mix. You
>can go up to 70 glycol:30 water in extreme cold areas, but this is
>compromising the heat transfer capability of the coolant.
>    I've known of a couple of cases where owners, wanting to do "the best"
>for their car, have tried running 100% glycol. Poor heat in winter and an
>overheated engine in summer is the usual result. This situation can sneak
up
>on you if you have a small coolant leak and keep topping up with pure
>glycol. You should top up with the proper glycol mixture.
>    You can test the coolant strength with one of the cheapo plastic
>testers, but be aware these have an accuracy of +/- 25%.
>
>HTH
>
>Fred Munro
>'91 200q  266k km  (running 60:40 mix for those -40 days)
>
>-----Original Message-----
>From: Huw Powell <human@nh.ultranet.com>
>To: Martin Pajak <quattro@rogerswave.ca>; quattro group
><quattro@coimbra.ans.net>
>Date: Friday, January 01, 1999 4:55 AM
>Subject: Re: more heat!
>
>
>>
>>Martin Pajak wrote:
>>>
>>> Huw,
>>>
>>> > on this litle drive, 7 miles, 10 deg F outside, this beater is making
>>> > HEAT.  I'm almost tempted to turn it down.  Now why can't my 82 do
>>> > that?  gotta be crap in the heater core/improper heater valve
operation
>>> > or SOMETHING and I want to fix it.  No way the cars could be that
>>> > different, is there?
>>>
>>> My Coupe had so much heat pouring out of the vents you could not keep
>your
>>> hand in front of it for long or it would burn.
>>> The 4kq on the other hand is only marginally adequate with simular
>outside
>>> temps.
>>> My friend's 4kq is even worse.
>>> I am tempted to pull the heater core out and check it out.
>>> Now that the A/C is out it should be a snap.
>>> I feel so sory for someone with A/C that actually has to replace one.
>>
>>exactly my thoughts.  It should only take 10-15 minutes to pop out my
>>heater core, most of that spent trying to make sure I don't spill any
>>juice on my carpets.  Then I can bring it inside and play with it.
>>
>>While I flushed the heck out of the system this summer putting in a
>>(used) radiator (old one got damaged in little accident, small leak by
>>front mounting rod.  Didn't throw out.) it's hard to tell if you're
>>getting water through the heater core.  Hmmm, I did replace the pipe
>>that runs by the block though (with a yellow one!) so I must have been
>>able to run hose water thru the core and nothing else...
>>
>>I guess we must all report after checking our heater cores so those with
>>A/C can decide if it's worth the work to get in there.
>>
>>--
>>Huw Powell
>>
>>http://www.thebook.com/human-speakers
>>
>>82 Audi Coupe; 85 Coupe GT
>>http://www.nh.ultranet.com/~human
>