Are breather filters really bad?
Yes they are. Read further for why. “Here’s the stock PCV diagram from the Helms manual. On the left is a cutaway view of the engine. On the right is a cutaway view of the stock intake. In the middle are the separate breather circuit and the PCV valve circuit: All you have to learn is how the fresh air cicuit flows (follow the open white arrow) and how the crankcase vapor (with oil vapors in it ) circuit flows (follow the black arrows). Notice which circuit flows to the valve cover (on top of the engine on the left)….it’s NOT the crankcase vapors. When you add a breather, you remove the line from the intake to the valve cover. The honda crankcase breather is a POSITIVE pressure ventilation system.The air from the intake blows into the valve cover. It is NOT a negative pressure ventilation system…it does NOT suck air from the valvecover to the intake. Breathers remove the source of positive ventilation that repressurizes the POSTIVE CRANKCASE VENTILATION (PCV) valve. There is less p
