[DeTomaso] Pressure cap question

[David & Marilyn Bell]

First, if you still have a stock swirl tank, the original cap ring was not
sized to mesh with stock American caps.  So American style replacement caps
often do not seal properly.

Second, the design of the Pantera cooling system is such that the swirl tank
and pressure cap are on the high pressure side of the water pump (unlike
most other vehicles).  So the spring cap has to deal with the normal
pressure originating from the heat and fluid expansion of the coolant, but
also practically all of the additional pressure generated by the water pump.
At high rpm the combination of heat and water pump pressure can overcome the
cap spring and coolant escapes.  The higher pressure radiator caps are one
way to contain it, though I agree that very high pressures are hard on the
cooling system in general.  Prior to reworking my Pantera cooling system and
removing the swirl tank completely, I had to run a 22 psi cap to keep the
coolant contained.  After swirl tank removal and addition of a separate
reservoir/pressure tank, I run a regular old 13 psi cap and no coolant
puking problems.

Dave Bell



-----Original Message-----
From: detomaso-bounces at realbig.com
[mailto:detomaso-bounces at realbig.com]On Behalf Of mike v
Sent: Sunday, August 21, 2011 10:31 AM
To: detomaso at realbig.com
Subject: [DeTomaso] Pressure cap question


Hi I was wondering what the pressure cap on the swirl tank should be as I
have seen, read that is was between #13-16 caps but then I see on some of
the Pantera site that sell parts and there saying #22 which is way too much
in my opinion.
 I have a brand new motocraft cap that's #13 and when the motor gets warm it
spurts out a small amount fluid, so either its bad or #13 isn't enough # for
pressure

thx in advance for advise
Mike #7042
_______________________________________________

Detomaso Forum Managed by POCA

Archive Search Engine Now Available at http://www.realbig.com/detomaso/

DeTomaso mailing list
DeTomaso at list.realbig.com
http://list.realbig.com/mailman/listinfo/detomaso