does the RX8 have an AST tank????
#5
Yeh, does look like an overflow tank, but the only thing that doesn't jive is that it's got a cap that's unlike what you'd normally see on an overflow tank, right?
Gotta dump all that underhood plastic so we can see the guts.
Gotta dump all that underhood plastic so we can see the guts.
#7
Rotary Enthusiast
It's a pressurized expansion tank, that functions as an ast, a fill neck, and a pressure accumulator by way of the head of air that resides in the top halft of the tank.
As coolant heats up an expands during warm-up, the air is compressed in the tank. once cap relief point is exceeded, some air vents out that hose below the cap.
Most modern cars now use this concept (saab used it in 1980). It helps to keep system pressure at the cap relief point, so you don't get ever have a combo of sudden high load and low coolant pressure, which could allow brief, excessive local boiling.
As coolant heats up an expands during warm-up, the air is compressed in the tank. once cap relief point is exceeded, some air vents out that hose below the cap.
Most modern cars now use this concept (saab used it in 1980). It helps to keep system pressure at the cap relief point, so you don't get ever have a combo of sudden high load and low coolant pressure, which could allow brief, excessive local boiling.
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