[DeTomaso] 1972 detomaso pantera cooling system

[boyd casey]

I am ignorant as far as the actual path the coolant follows on it's travels
through the car. I was told that the "By pass valve" kept the coolant
icirculation and that just shutting off the flow at the fire wall actually
prevented a portion of the coolant from being circulated. So which is right?
I wouldn't be surprised if the sales person mis represented the facts to
favor his product (the by pass valve) In any case I didn't buy one.
Boyd

On Tue, Sep 7, 2010 at 12:52 AM, David & Marilyn Bell <
davidabell at worldnet.att.net> wrote:

> A non-trivial amount of the cooling system's ability to shed heat will be
> lost if coolant is diverted from the heater core and allowed to freely
> circulate internally.  The diverted fluid (maybe 20% or so of the water
> pump
> capacity) traveling in the short-circuited loop never makes it to the
> radiator and so doesn't contribute to cooling off the engine.  The lost
> cooling capacity may not be all that important when the heater would
> normally be on (when it's cold outside), but might be in the summer when
> the
> cooling system is much more stressed.
>
> IMHO, it's much better just to block off the heater ports completely.
>
> Dave Bell
>
>
> -----Original Message-----
> From: detomaso-bounces at realbig.com
> [mailto:detomaso-bounces at realbig.com]On Behalf Of boyd casey
> Sent: Monday, September 06, 2010 9:28 PM
> To: Asa Jay Laughton
> Cc: detomaso at realbig.com
> Subject: Re: [DeTomaso] 1972 detomaso pantera cooling system
>
>
> To any one interested Vintage Air makes an electronic servo valve that
> allows you to "by pass the heater core (and cabin) from inside the car with
> a switch. I don't know if it's fail safe enough for race track safety
> inspectors but it's pretty cool and it dosent just cut of the water flow it
> allows it to "By Pass" the heater core but continue flowing through the
> rest
> of the cooling system so it is not adversely afeected by just cutting off
> the normal flow pattern.
> Boyd
>
> On Mon, Sep 6, 2010 at 10:19 PM, Asa Jay Laughton <asajay at asajay.com>
> wrote:
>
> >  Bob,
> >
> > If those are in the heater hose lines, then they are designed to
> > shut-off coolant flow to the heater core.  There are two purposes in
> > this.  First, it reduces interior heat, especially in the summer when
> > you are trying to use the A/C.  Second, some racing bodies want  you to
> > have shut-offs just in case you blow a heater core or interior line, it
> > doesn't blow hot coolant all over your feet, windows, etc.
> >
> > Asa Jay
> >
> > Asa Jay Laughton, MSgt, USAFR, Retired
> > &  Shelley Marie
> > Spokane, WA
> > ******************************
> > http://www.racingagainstautism.com
> > http://www.teampanteraracing.com
> >
> >
> > On 9/6/2010 17:55, LEVITT1946 at aol.com wrote:
> > > Dear Group,
> > >
> > > My Pantera has two water shutoff valves in the rear of the car located
> > > below the coil. Are these valves(1/2") necessary in the Pantera
> > cooling/heating
> > >   system system? What is their function?
> > >
> > > Bob
> > > Team Pantera racing #3196
> > > Gumball3000 #56
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