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Hi
Al;
While my system is laid out somewhat differently (not
withstanding the EWP), I too have 2 pressure caps, one 22psi cap on the system
and a 15 psi cap on the overflow bottle. My overflow bottle is a new snowmobile
coolant bottle that I had surplus and it happened to have a 1bar cap one it. Now
I had expected to see compound pressures on my system (22+15=37), but have never
seen greater than 23 psi. (On my latest flight it appears that the coolant press
reg has failed as it read 0 psi even when I loosened the cap and found plenty of
pressure).
In your post you state that it is possible to reach 38 psi,
then you go on to say that on take-off your system is at least 23 psi. So my
question is have you ever seen any compound pressures in your system (greater
than 23 psi ???)
Todd (rum & eggnog.... shopuld I have
another???? hmmnnn, decisions..)
Al,
Yes! with everyone's input, it
does now make sense, mind you I had seen that picture before and was
somewhat confused with all the pipes going here and there, I could never
understand what was going where.
One question Al, I thought the
expansion bottle might need to be bigger as big as the overflow bottle shown
- I guess your saying that it doesn't need to be that large as the
overflow is taking up any further expansion.
George ( down
under)
In my case the
overflow bottle is the
expansion tank. The filler neck stays completely full of
coolant.
I don’t know
exactly how much total expansion there is; but I know that starting with
about 3-4” in the bottom of the overflow bottle, no coolant goes overboard
from there when the coolant temp is up to 220F, so the total is less than a
quart. At some point I will leave the cap off the overflow bottle and
observe the change in the coolant level from cold to hot.
Al
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