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Ok. So, now I wonder. If you remove those hose connections to the manifold, as you mentioned, how is the minor vacuum produced to help the engine breathe? Is this minor vacuum unnecessary then, so that you allow the engine to passively breathe on its own and with a check valve on their, or reed valve breather, it will just expel air as it needs and carry on? I had thought that a minor vacuum is necessary for the engine to maintain a slight negative pressure or zero pressure.

[QUOTE="Starvingphotog, post: 600079, member: 12517"] Ok. So, now I wonder. If you remove those hose connections to the manifold, as you mentioned, how is the minor vacuum produced to help the engine breathe? Is this minor vacuum unnecessary then, so that you allow the engine to passively breathe on its own and with a check valve on their, or reed valve breather, it will just expel air as it needs and carry on? I had thought that a minor vacuum is necessary for the engine to maintain a slight negative pressure or zero pressure. [/QUOTE]