1998 Mazda Protege Oil breather filter

HI there,

I have no idea as to what this filter is, can you give me a web page and part No so I can see what it looks like, that may help.

Mark

HI there,

This looks like an oil filler breather, this will not be compatible with your engine, I would be sending it back.

Mark (mhpautos)

Hi there,

Your engine is designed to run the PCV valve this is a requirement by law, in days before pollution requirements, engine were open breathing engines, and some oil fillers has this type of filter, you just cant take of the PCV valve and stick on a fancy filter the system just does not work that way, see text for info on the PCV system

Mark (mhpautos)

PCV system
The PCV valve is only one part of the PCV system, which is essentially a variable and calibrated air leak, whereby the engine returns its crankcase combustion gases. Instead of the gases being vented to the atmosphere, gases are fed back into the intake manifold, to re-enter the combustion chamber as part of a fresh charge of air and fuel. The PCV system is not a classical "vacuum leak." All the air collected by the air cleaner (and metered by the mass air flow sensor, on a fuel injected engine) goes through the intake manifold. The PCV system just diverts a small percentage of this air via the breather to the crankcase before allowing it to be drawn back in to the intake tract again. It is an "open system" in that fresh exterior air is continuously used to flush contaminants from the crankcase and into the combustion chamber.

The system relies on the fact that, while the engine is running, the intake manifold's air pressure is always less than crankcase air pressure. The lower pressure of the intake manifold draws air towards it, pulling air from the breather through the crankcase (where it dilutes and mixes with combustion gases), through the PCV valve, and into the intake manifold.

The PCV system consists of the breather tube and the PCV valve. The breather tube connects the crankcase to a clean source of fresh air, such as the air cleaner body. Usually, clean air from the air cleaner flows in to this tube and in to the engine after passing through a screen, baffle, or other simple system to arrest a flame front, to prevent a potentially explosive atmosphere within the engine crank case from being ignited from a back-fire in to the intake manifold. The baffle, filter, or screen also traps oil mist, and keeps it inside the engine.

Once inside the engine, the air circulates around the interior of the engine, picking up and clearing away combustion byproduct gases, including a large amount of water vapor, then exits through a simple baffle, screen or mesh to trap oil droplets before being drawn out through the PCV valve, and into the intake manifold

No automotive engines built after the introduction of these pollution laws can use them, these will be ok on most cars say pre mid 70's or there abouts

Mark