[DeTomaso] 1972 detomaso pantera cooling system

Tue Sep 7 18:29:12 EDT 2010

Dave's comment makes sense-- if the portion of the hot coolant that goes down the heater pipe / hose is shunted to the backflow hose and comes back into the system just as hot as it left it (or nearly) then you have a constant infusion of hot coolant into the "cooled" portion coming back from the radiator.  So the result will be the cooled solution will be hotter than if that infusion were not taking place.

If you shut off the heater hose then no coolant goes that way and it all goes to the radiator and gets cooled.

Jim Oddie

-----Original Message-----
From: boyd casey <boyd411 at gmail.com>
To: David & Marilyn Bell <davidabell at worldnet.att.net>
Cc: Asa Jay Laughton <asajay at asajay.com>; detomaso at realbig.com
Sent: Tue, Sep 7, 2010 6:47 am
Subject: Re: [DeTomaso] 1972 detomaso pantera cooling system

I am ignorant as far as the actual path the coolant follows on it's travels
hrough the car. I was told that the "By pass valve" kept the coolant
circulation and that just shutting off the flow at the fire wall actually
revented a portion of the coolant from being circulated. So which is right?
 wouldn't be surprised if the sales person mis represented the facts to
avor his product (the by pass valve) In any case I didn't buy one.
oyd
On Tue, Sep 7, 2010 at 12:52 AM, David & Marilyn Bell <
avidabell 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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