Purpose of Crankcase Ventilation

During the combustion process, a small amount of combustion gases, known as blow-by gases, escape past the piston rings and enter the crankcase. These gases contain various substances such as unburned fuel, water vapor, and combustion byproducts. If not properly managed, these gases can cause increased pressure within the crankcase, leading to oil leaks, reduced engine efficiency, and potential damage to engine components.

Positive Crankcase Ventilation (PCV) System

Several OEM Engines have integrated Positive Crankcase Ventilation (PCV) systems, designed to manage these blow-by gases by routing them back into the engine's intake manifold, where they are burned off during the combustion process. This system helps reduce emissions and maintain engine performance.

Catch Cans

Catch cans are an aftermarket addition to a PCV system that provides an extra layer of protection and efficiency. They are designed to capture and separate oil vapors and other contaminants from the blow-by gases before they are reintroduced into the intake manifold.

How Catch Cans Work:

1. Installation: Catch cans are installed in-line with the PCV system. They are typically placed between the crankcase vent and the intake manifold.

2. Separation: As blow-by gases pass through the catch can, the can's internal baffles or filter media separate oil vapors and other contaminants from the gases.

3. Collection: The separated oil and contaminants are collected in the catch can, preventing them from entering the intake manifold and causing carbon buildup or other issues.

4. Maintenance: Catch cans need to be periodically emptied and cleaned to ensure they continue to function effectively.