radiator caps, cooling system pressure
 

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...ap-13-bar.html
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 additional 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?????

radiator caps, cooling system pressure
 

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...ap-13-bar.html
> 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.

radiator caps, cooling system pressure
 

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!

radiator caps, cooling system pressure
 

On Apr 21, 9:50*pm, "
> 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!

DONT EVEN THINK ABOUT THIS WITH A CHEVY VENTURE! their engine the 6
cyc one tends to develop super expensive head gasket leaks as is......

some things are best left alone

radiator caps, cooling system pressure
 

On Sun, 21 Apr 2013 15:21:32 -0700, 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.


How often does that happen? If it is frequent, you have other
problems that need to be fixed. Last time I had a boil over was
probably in the 1960's or so.

This is not the proper thing to do. The engineers have put a lot of
work into getting the right temperature and pressures and you think
you can do a better job? Really?

radiator caps, cooling system pressure
 

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..

radiator caps, cooling system pressure
 

On Sun, 21 Apr 2013 19:08:23 -0700 (PDT), bob haller >
wrote:

>On Apr 21, 9:50*pm, "
> 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!
>
>DONT EVEN THINK ABOUT THIS WITH A CHEVY VENTURE! their engine the 6
>cyc one tends to develop super expensive head gasket leaks as is......
>
>some things are best left alone
I'd never overpressure anything with a plastic tank rad. Actually I
wouldn't overpressure ANY system.

radiator caps, cooling system pressure
 

On Apr 21, 11:21*pm, 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 additional 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?????

The only way to increase the system pressure would be to change the
thermostat to a higher temperature one so increasing temperature as
well as pressure.
You would then have to change the radiator cap too. But changing the
radiator cap alone wouldn't change the pressure but in the event of
engine overheat/pressure would negate the protection it gives.

Very unwise, you may get hoses bursting and engine overheating .
If your engine is overheating there is a problem with the radiator
(blocked) or the thermostat not fully opening.
Possibly slack belt (drives the water pump).
Electric fan (or it's thermostat) if it has one faulty.
Waterways in cylinder block/head blocked/corroded.

radiator caps, cooling system pressure
 

On Apr 21, 11:15*pm, wrote:
> 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..- Hide quoted text -
>
> - Show quoted text -

You might want to rethink that one. Water isn't going to
move through a system without pressure to push it. I wouldn't
expect the pressure to be very high, but there has to be pressure
due to the pump.

As for the question at hand, what is unstated is if there is
actually a problem, ie is the car overheating? If it is, then
finding out the cause of that instead of trying to raise the
boiling point of the coolant via pressure would seem to be
the better approach. For example, if he has a bad thermostat
or collapsing hose, he'd be just covering up the real problem.

radiator caps, cooling system pressure
 

On Apr 22, 2:31*am, harry > wrote:
> On Apr 21, 11:21*pm, 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 additional 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?????
>
> The only way to increase the system pressure would be to change the
> thermostat to a higher temperature one so increasing temperature as
> well as pressure.

Dumb as ever. The current cap releases pressure at 7 PSI when
the car overheats. He's proposing changing it to 13 PSI so that
when it is overheating, it will not release until that higher pressure
is reached. That results in a higher pressure when overheating
exactly as he claimed and doesn't require changing the thermostat.



> You would then have to change the radiator cap too. But changing the
> radiator cap alone wouldn't change the pressure but in the event of
> engine overheat/pressure would negate the protection it gives.
>

Dumb as ever. When the engine overheats, which is what he's
specifically concerned about, having that higher pressure cap will
result in higher pressure.



> Very unwise, you may get hoses bursting and engine overheating .
> If your engine is overheating there is a problem with the radiator
> (blocked) or the thermostat not fully opening.
> Possibly slack belt (drives the water pump).
> Electric fan (or it's thermostat) if it has one faulty.
> Waterways in cylinder block/head blocked/corroded.- Hide quoted text -
>
> - Show quoted text -

That part is correct. Even a stopped clock is occasionally correct.