[DeTomaso] Pressure Cap

[John Taphorn]

Asa

Fair question.  The pressure in the fill tank is muted by the relatively 
small diameter line filling tank (~ 1/4" brake line) and a larger 3/8" line 
connecting the fill tank to the water pump. As I mention in the article, I 
am uncertain as to whether this is the ideal line circumference/flow 
differential to maintain ideal pressure in the fill tank; however, it seems 
to work.  The bigger line on the suction side allows more coolant to leave 
the tank than is able to enter through the higher pressure side.

Perhaps, with your new system you can plumb some gauges for us to accurately 
measure the pressure differential.  It would relatively easy to adjust line 
sizes into and out of the fill tank.

JT


----- Original Message ----- 
From: <asajay at asajay.com>
To: <detomaso at realbig.com>
Sent: Wednesday, August 19, 2009 4:34 PM
Subject: Re: [DeTomaso] Pressure Cap


> I've been working implement this very thing on my Pantera, though it
> may move to a winter project.
>
> One big question still lingers for me though.
>
> Also attached to the new fill/expansion tank, is a bleed from the HOT
> side.  A small tap on the outlet tube attaches to the same tank.  So
> why doesn't -that- connection pressurize the tank to the same level
> the hot side is already?
>
> I realize it's supposed to be an air bleed, but pressure is pressure
> isn't it?  If that connection is on the highest pressure line of the
> cooling system, why doesn't it affect the tank?
>
> Terribly curious and no good at fluid dynamics much less thermal dynamics.
>
> Asa Jay
>
>
> Quoting Barry Seib <oldwheel at mts.net>:
>
>> Yes Jack
>> That's what the Mike Trusty/John Taphorn mods accomplish.You can use the
>> heater return port in the water pump to connect to the expansion/fill 
>> tank
>> (which has the pressure cap on it). No more tank on the hot side and no 
>> more
>> restriction to getting the hot coolant to the rad. That's not the only 
>> way
>> to do it. The flowkooler pump has a second theaded port to the return 
>> side
>> anyway, but I'm using that for my fan temp sensor. John's heater is fed 
>> and
>> returned up front, but you wouldn't have to do that. He also used a 
>> bypass
>> thermostat, and some bleed pipes at the back of the heads, but those 
>> things
>> are also optional. What is most important is to remove the tank and 
>> pressure
>> cap from the pressure (HOT) side and move it to the cooler return side.
>>
>> http://www.spacecitypanteras.com/Technical/pantera_coolant_flow.jpg
>>
>> http://www.spacecitypanteras.com/Technical/Pantera_Cooling-JTaphorn.pdf
>>   -----Original Message-----
>>   From: JDeRyke at aol.com [mailto:JDeRyke at aol.com]
>>   Sent: Wednesday, August 19, 2009 3:07 PM
>>   To: oldwheel at mts.net; detomaso at realbig.com
>>   Subject: Re: [DeTomaso] Re: Pressure Cap
>>
>>
>>   In a message dated 8/19/09 12:38:44 PM, oldwheel at mts.net writes:
>>
>>
>>     What I referred to as the "hot side" is the tank and pipes between 
>> the
>> engine outlet and the radiator
>>
>>
>>   So the cap 'should' be on the water pump side of the engine? That seems
>> unweildy on a Pantera unless its up front somewhere.... Curious- J Deryke
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