[DeTomaso] Third fan / cooling problems at idle.

[Doug Braun]

That's the point MD.  Stock fans are lucky to provide 500 CFM apiece.  By
adding a 3rd 1200 or so CFM fan to the back, it'll total to a little more
flow of your setup which you have proven is adequate.

Doug

 -----Original Message-----
From: Mad Dog Antenucci [mailto:teampantera at yahoo.com]
Sent: Tuesday, July 22, 2008 11:33 AM
To: doug at silicondesigns.com; Kjetil Finne; ERPIKE at cs.com;
detomaso at realbig.com
Subject: Re: [DeTomaso] Third fan / cooling problems at idle.


  My single sucker fan moves something like 1800cfm which is what I have
used on the back side of the Pantera's race cup radiator with no problems
for 2+ years.

  Doesn't matter if I am at WOT on the track or an open road race or stuck
in traffic on a hot summer day. Mike Trusty and Dick Drenske who are both
mechanical engineers can confirm what I have been telling you slackers ;-]>
for 2 years.

  Dawg

  Doug Braun <doug at silicondesigns.com> wrote:
    My third fan suggestion to Chris is mainly for those owners who still
have
    the stock front mounted pusher fans. IMHO, the stock fans have
insufficient
    air flow capacity to cool the radiator. A centrally located, 13 or 14"
    puller fan in the rear is a simple and inexpensive way to remedy this.
Such
    1200 to 1500 CFM fans are readily available on eBay for $30 to $50. For
    those who have converted to more powerful dual front pusher or dual rear
    puller fans, the third fan is likely unnecessary weight.

    Doug Braun
    blue 73L #5505

    -----Original Message-----
    From: detomaso-bounces at realbig.com
    [mailto:detomaso-bounces at realbig.com]On Behalf Of Kjetil Finne
    Sent: Monday, July 21, 2008 9:59 AM
    To: ERPIKE at cs.com; detomaso at realbig.com
    Subject: Re: [DeTomaso] Third fan / cooling problems at idle.


    What I have found is that if you have cooling problems at idle it is
    most likely caused by insufficient coolant circulation, not by not
    having enough air over the radiator.
    The heat generated by the engine should be less at idle than at higher
    speeds. (I guess?)

    Kjetil

    ERPIKE at cs.com wrote:
    > Chris:
    > I noticed you have 3 fans. Did the 3rd fan help with cooling when you
have
    to sit and ilde alot?
    >
    > Ed...
    >
    > Christopher Kimball wrote:
    >
    >
    >> What I did was to tap into the wires at each fan motor (I have
    three--much to Mad Dawg's chagrin!) using the positive and negative
leads
    right before they went into the fan motors and ran the thee pairs of
wire to
    the dash. I drilled three little holes above the headlight switch and
    mounted three different colored LEDs (which I bought at Radio
Shack--made
    especially for 12 volts) so now I know exactly when each fan is
operating.
    >>
    >> The LEDs must be hooked up correctly with the positive side to the
    positive wire and negative to negative.
    >>
    >> Chris
    >>
    >> #3846
    >>
    >>
    >>> From: MikeLDrew at aol.com
    >>> Date: Sun, 20 Jul 2008 00:36:38 -0400
    >>> To: adin at frontier.net; detomaso at realbig.com
    >>> Subject: Re: [DeTomaso] indicator light
    >>>
    >>>
    >>> In a message dated 7/19/08 17 37 44, adin at frontier.net writes:
    >>>
    >>>
    >>>
    >>>> I need to have a little light to let me know when the cooling fans
    >>>> come on (ford, but not pantera) . . . it seems one could just take
12v
    >>>> off the fan to a light. It also seems this is a fire waiting to
    >>>> happen - do I need to take the power off the relay???
    >>>>
    >>>> Help please . . .
    >>>>
    >>>> electronically challenged I remain,
    >>>>
    >>>>
    >>> Dave,
    >>>
    >>> De Tomaso was way ahead of you--there is a fan indicator light
sitting
    right
    >>> there at the bottom of your speedometer!
    >>>
    >>> That light is amber in color, and moron Lincoln Mercury customers
    interpreted
    >>> that as a WARNING light and this drew complaints. So after early
1972,
    it
    >>> was left unconnected.
    >>>
    >>> It is a very simple matter to string a wire from the output side of
your
    #2
    >>> fan relay back to this light. Voila! :>)
    >>>
    >>> Actually, if you string it from the output side, where 12V flows to
the
    fan
    >>> motor, then the spinning fan might cause the light to glow when it
is
    spinning,
    >>> but not powered. Come to think of it, it's probably better to string
    the
    >>> wire from the input to the fan relay, where the relay gets its "turn
on
    the fan"
    >>> signal from the thermoswitch in the radiator.
    >>>
    >>> Mike



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  Mad Dawg Antenucci
  Team Pantera Racing
  The 1st & still the only vintage race team in open road racing
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