On Sun, 21 Apr 2013 18:50:29 -0700 (PDT), "
> wrote:

>On Apr 21, 6:11*pm, Tony Hwang > wrote:
>> Ashton Crusher wrote:
>> > I was thinking of putting a higher pressure cap on one of my cars to
>> > increase the factor of safety against boiling. *Looking thru the web
>> > for info on the likelihood of changing from 7 psi to 13 psi causing
>> > leaks I found little on that issue but did find a couple references to
>> > the pressures created by the water pump. *One site boasts of a 19 PSI,
>> > $25 cap to get you thru your "hard driving".
>> >http://www.mishimoto.com/mishimoto-h...tor-cap-13-bar....
>> > Thought I'd see if anyone else has heard of this. *The claim was that
>> > the water pump could create over 30 PSI of pressure. *Since that is
>> > double the normal operating pressure of most modern cars I find it
>> > hard to believe. *If the system was at full 15 psi of pressure while
>> > the car is idling and then your floored it and ran it up to near
>> > redline * and created another 30psi of additional pump pressure, or
>> > even 10 psi of additioingnal pressure downstream at the radiator cap, you
>> > would immediately cause the system to have to vent to the overflow to
>> > relieve this higher pressure. * I've never seen a car vent due to me
>> > revving the engine up while I'm working on it. Thoughts?????
>>
>> Hi.
>> There is a over flow bottle for coolant/anti-freeze. Ever
>> cleaned/flushed your rad. and maintain proper level of
>> coolant/anti-freeze in your rad.? If the car is old, messing with cap
>> can spring
>> a leak.- Hide quoted text -
>>
>> - Show quoted text -
>
>AMEN!
A water pump cannot produce system pressure because it just moves
water from one side of the pump to the other. Expansion due to heat is
what builds pressure..