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Originally Posted by infernosg
You forget you're talking to another engineer here (and a VT AOE graduate to boot), but that is what I was getting at. If air entered through some small tear with the car off (under vacuum) it would be pushed out with the car on. The air would be pushed through the path of least resistance - the open radiator cap. However, because the car is on no additional air can enter so at some point the bubbling would stop. What I have is a constant stream (continues for more than 10 minutes) so this leads me to believe it is not the issue.
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It was more for other individuals reading than for you
. Do the bubbles correlate to the heat increase? Or is it independent? IE if you run the engine; reach operating temperature; bubbles stop or bubbles continue but operating temperature is maintained.
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I'd love to pressure test every component but I just don't have the means.
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And you call yourself an engineer
. Hit up Lowes/Home Depot and build your own for less than $50.00.
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I'm inclined to believe ReTed that there is a small failure point likely on the compression side of the rotor housing. This would explain why I don't have a continuous cloud of white smoke because the pressure is keeping the coolant out, but would explain the little bit I get after starting the car after it's sat for a while. It's always done that but I just assumed it was condensation. I can think of nothing else that would cause the continuous build up of pressure. I guess the HPDE just pushed it over the edge. I was really hoping the stock engine would last more than 105k miles...
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If it's how I imagine it is working than that small failure point is an indication of the casting failing... which 'shouldn't' happen on an S5.