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Todd
Can you explain how using two pressure caps (one 22lb & one 15 lb) add up to a possible total system pressure of 37lbs. I can only see it as a max of 22lbs,
Georges B.
-------Original Message-------
Date: 12/11/05 00:24:08
Subject: [FlyRotary] Re: Radiator Expansion Tank
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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