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- MilkyWay Galaxy
Most people do not appreciate the complexity of the OEM CCV routing. I suspect the mod you made on the front side of the valve cover to the throttle body air intake is not equal in terms of vacuum at various points, like idle, WOT, acceleration and deceleration. The stock system ran back to the clean side of the air filter (IIRC???), inside a very large opening (the air filter box), not back into a 3" dia tube right at the throttle body opening.
The rear manifold orifice (stock) is designed to control the flow rate of air sucked out of the crankcase via the valve cover connection. When there is little blow by gas, the make up air is supplied front the front CCV line, which in the stock OEM set up is also under some vacuum, but not much vacuum, not nearly as much vacuum as the rear connection, as it is on the clean side of the air filter box.
I suspect the OEM CCV set up was a carefully thought out balancing act of variable vacuum rates, and gas flow scrubbing action in the crankcase on both sides of the throttle body at various times!!!!
The rear manifold orifice (stock) is designed to control the flow rate of air sucked out of the crankcase via the valve cover connection. When there is little blow by gas, the make up air is supplied front the front CCV line, which in the stock OEM set up is also under some vacuum, but not much vacuum, not nearly as much vacuum as the rear connection, as it is on the clean side of the air filter box.
I suspect the OEM CCV set up was a carefully thought out balancing act of variable vacuum rates, and gas flow scrubbing action in the crankcase on both sides of the throttle body at various times!!!!