Al Gietzen wrote:

So here's my filler neck and bottle setup (first pic).  25# cap
overflows to overflow bottle with 15# cap.  Is my system pressure a.)
25#; b.) 40#; or c.) something  else?

I assumed that the 25# cap would relieve at 25# above outside
pressure, but then realized that there is a seal at the top of neck
just under the cap as well, so the relief 'valve' is seeing the
pressure to the relief line, which could be the 15# in the overflow
bottle, making the total 40#.  It depends on how much pressure the top
seal will hold.  Anybody know?

The other concern that came to mind is that I have a 1/4" aluminum
line from the filler neck relief to the overflow bottle.  The i.d. is
about 5/32''.  Is this big enough?  Is there likely a time when the
coolant expansion is too rapid for this line and it dumps overboard
past the top seal at the cap?

Could be I'll have to pressurize the system and measure the pressure
the caps hold, an the line size will have to be determined by experience.

Second pic shows the completed installation.  At the pump outlet at
the top you see the air bleed (AN o-ring plug drilled up the center
and out the side just below the o-ring. Loosen it a turn and the air
can escape), the pressure sender below that, and the low level sender
at the bottom of the overflow bottle.

Al

-Steve Brooks wrote:

Al,
Where did you get the blue radiator type hose that is in the photo ?

Steve Brooks

 
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