| Oh, why.
Tha fact that the cap is sprung loaded WILL allow water to flow in both directions, really.
I have had similar systems installed on many cars and bikes. After a good run, when the temp gets up there is a small amount in the tank, as it cools, it sucks is back in - honest.
Feel the small poppet valve in the center of the cap, that's what it's there for.
Rgds, Rob
[Edited on 3-5-2005 by rob41b] |