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Message: [QUOTE="Maryland dieselnick, post: 1273445, member: 22661"] I'm not sure instantaneous is the word I personally would use. It does follow temp. The key to getting ones head around the event is to keep in mind, thermal expansion is going on. Now it has a point where the clearance in the stem is taken up by this expansion. It does not "seize" in place but rather it hits a threshold point where it creates enough resistance to overcome the stored energy in the spring trying to pull it back. This margin can be extremely thin so virtually any change in the dynamics in the combustion chamber, ie, back pressure, air charge and or fueling ect will tip the scales in the opposite direction. But Curtis yes I think this is where your question originate from, that it is a very fast occurring situation that is a physical condition on a razors edge of not even happening at all, Hanse the very often almost just enough to cross the line of offering enough resistance while in its static state to overcome the stored energy in the spring trying to pull it closed. [/QUOTE]

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