Originally Posted by 69gaugeman

Well, I am still not convinced. I thought about the acceleration in the water pump too, but two factors limit this theory. One is that it is an impeller style pump with quite a bit of clearance. Like a turbo charger it is inefficient at low revs and builds as speed occurs. The total amount of possible pressure is limited by design. Even if you accelerated twice as fast the pump has a design limitation. Now, to be fair I am not sure of what this limitation is, but I am sure there was a lot of thought when designing it at Porsche.

Anyone have a rad they want to blow up? Run a pressure test to failure and see what pressure will do it. Then stick a pressure gauge in Rob's car and see what is generated there. It will certainly prove or disprove this theory easily.