[DML] Re: Fan Thoughts (John Hervey)

["content22207" <brobertson@xxxxxxxxxxxx>]

I'm going to try this broad band...

The reason DeLorean fans come on with A/C irrespective of MPH is
because it's an extremely simple circuit. I'm still using a pair of
teeth rattling originals. Believe it or not, you can feel them cycling
even at 75 MPH.

My theory of DOA newer vehicles -- cooling systems in summer heat for
example -- is that every single system in the car (cooling,
electricals, fuel delivery, exhaust) operates within a much narrower
window of tolerance than older vehicles. In the bad old days, systems
could degrade 50% and remain functional. Part of this was necessary
due to the less refined consumables used in them (gas, oil, coolant,
filters, spark plugs, etc). Part of this was simply inert design
theory -- there was no size or weight penalty for making systems
bigger than they had to be.

3 row radiators (100% copper) used to be the norm. Now most of them
are single row, with aluminum cores only. Radiators used to sit full
face at least 1/2 width of the vehicle (which was itself much wider
than contemporary models). Now, they are very small and tucked away in
a corner of the engine compartment. Radiator hoses used to be more
than 2" in diameter. Now, they are closer to 1". You get the idea.

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, "John Hervey" <john@xxxx> wrote:
> A scientific wind tunnel study wasn't done, but by my CFM meter I
bought I
> estimate about 80% compared to the original. Maybe someone can tell
me or
> direct me somewhere that at what point that moving hot air over the
radiator
> at what speed makes no difference in the cooling or drawing capacity
of the
> fans. What I have heard is at 35 to 40 mph the fans make no
difference. I
> never could understand why driving at certain temps that the fans
even need
> to be on when the AC is on.
> Any where in the south where we have 100+ degrees is subject to test
even
> the best cooling systems in even the newer cars.  As you all know,
we even
> see newer cars pulled over to the side of the road in stop and go summer
> time traffic.
> I have also heard of some people driving year round on one Delorean
fan with
> no problem. A lot of people complain about the current draw and light
> dimming when the original fans come on and not counting the 30 amp +
load on
> the electrical circuit.
> I also feel a lot of over heating is caused by not properly
inspecting the
> car for a lot of things. How many $20.00 otterstat are replaced
every 2 to 3
> years or even inspected. I have seen several that I show on the site
that
> split because they were so old and folks wondered why the car over
heated.
> I can go on and on about heating and cooling, but they are what they
are and
> have all the pluses that I listed on the site.
> If anyone would like to discuss this further I would welcome the
dialog, but
> due to the long conversations I have had it would be better off line
and the
> conclusion posted.
> Thanks for asking.
> John Hervey
> 







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