How to find the right Automotive Performance Crankcase Ventilation Filters AI guide

Written by an AI model from its trained knowledge.

What the AI looks for in Automotive Performance Crankcase Ventilation Filters

Baffling and separation: A catch can or separator should have internal baffles or media. An empty cylinder separates very little oil. Oil separation depends on slowing and redirecting the vapor, not just on volume.
Hose and fitting size: Match inlet and outlet sizes to the existing PCV and breather hose inside diameter, and use oil-resistant hose. Undersized fittings restrict crankcase ventilation and can raise crankcase pressure and push out seals.
Closed vs. vented system: On road vehicles, keep the system closed (routed back to the intake). Open valve-cover breathers that vent to the air are generally not emissions-legal on the street. Crankcase emissions are regulated, and an open breather can also cause fuel-trim and idle problems.
Diesel CCV filter match: For diesels with a factory CCV filter element, use the OEM part number or a direct cross-reference. The element is engine-specific, and a clogged one raises crankcase pressure.
Drain access: Choose a can with a drain valve or easily removable bottom, and mount it where you can service it. A can that is hard to empty gets neglected and overfills back into the intake.

Mishimoto: Vehicle-specific baffled catch can kits for many popular platforms.
Radium Engineering: Performance-oriented catch cans and separators with model-specific kits.
Moroso: Longstanding racing brand offering air/oil separators and breathers.
K&N: Valve-cover breather filters in many sizes.
Fleetguard: OE-type CCV filter elements for Cummins diesel engines.

No. It sits in line with the PCV system and the PCV valve remains in place to meter flow.