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Why Negative cam or Inward cam used in Air distributor of the MAN B&W Starting Air System.Why not a positive cam?

 The cam for the air distributor serves its purpose only while starting the engine, reversing and again starting. Actually if you see there is no other requirement of this particular cam while the Engine is in continuous operation. Therefore if a cam ( normal positive ) is used then the wear of this particular cam will be obviated and will be expensive to repair/replace this cam. So when the engine has started, and the vessel is en-route a voyage, then this particular cam turns without any running gear touching it. It comes into play only while starting.
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