On 2003-11-02 18:36:10 -0800, (null) said:

Part of the preflight checklist for my Warrior is to open up the pitot
and static drains beside the pilot seat to let out any moisture that
might have accumulated in the system, for what that's worth. I always
do it, and I've never seen any come out.

Test question: What is the maximum engine rpm permitted to perform this?
(The Turbo Arrow IV manual provides a limitation)

Are you maybe thinking of the manifold pressure drain? There is a limit on that one. The pitot and static drains don't really relate to the engine.