ACH57 >>crimped down the copper tubing to limit the flow but keep enough so there's no pressure buildup in the crankcase.<<
The reverse is true. Before you re-engineer your PCV(Positive Crankcase Ventilation) system, you should learn how they work. The pressure is created by blow-by past the pistons/rings. The PCV system puts a small vacuum in the crankcase and pulls the vapors and pollutants into the intake manifold so the engine can burn them. This has the added benefit of keeping the engine cleaner and free of small oil seepage past seals. The breather part of the PCV system allows fresh clean air in to replace the vapors.
At idle and deceleration, the vacuum is highest and the PCV valve is nearly CLOSED.
Deceleration!!I bet that is when your brakes are on and as luck would have it, you are not loosing vacuum to the PCV system. The valve is partly open when cruising and open the most in acceleration when blow-by is highest.
Your crimp will probably clog up. Let the PCV do its job.
Here is one of thousnds of web sites that can explain this system to you.
http://www.aa1car.com/library/pcv.htm
