Quote:
Originally Posted by Large Arbor
Ok, I am completely confused here. Why is an overflow bottle needed? If the intent is to save cats, ok, save cats. I can't ever recall seeing any antifreeze or water on the floor after a hard run. Oil yes, water or antifreeze, not a drop. So what is the intended purpose?
Phil |
The purpose of overflow tanks on 427's and 289's is to allow for fluid expansion. When the car is driven, especially on hot days, then shut off, the coolant's temp rises with heat soak. If it's just water, at 212 it boils-bit higher with coolant. Radiator caps rated 16-20 pounds pressurize the system so the boiling points are a bit higher. Boiling=expansion; that's why the tanks are there. If the expanded fluid fills the tank, it runs out the thoughtfully provided overflow tube-onto the ground.
Race sanction bodies only permit water and prohibit you from putting any on the surface.
That's what the overflow bottles prevent.
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