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

 Al,

    How much can you flex with system ? It looks lke it is fairly rigidly
mounted to the fiewall, what happens if the engine rocks under acceleration
or decelration (torque) ?
John

 
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