- Racor Crankcase Ventilation Products
The Problem Engines Releasing Pollutants Through Unfiltered Breathers
Crankcase blow-by gas is produced when combustion gases under high pressure escape past piston rings into the crankcase. As these blow-by gases pass though the crankcase, they become contaminated with oil mist. In enclosed areas like generator sets or engine rooms, contaminated blow-by gas coats and damages the surrounding equipment, resulting in hazardous conditions and expensive clean up maintenance. Uncontrolled blow-by oil mist also coats engine after coolers and turbochargers, reducing cooling capacity and engine efficiency.
Racor’s Crankcase Ventilation Systems remove the mist and contamination before it can do damage. In closed systems (CCV), the high efficiency filter prevents fouling of the turbocharger and after-cooler. In open systems (CV), the high efficiency filter prevents fouling of surrounding equipment and walls while the cleaned exhaust is allowed to vent directly to atmosphere.
Open systems are acceptable for certain engines and situations. However, environmental concerns and legislation to control crankcase emissions have increased significantly. New laws to further reduce the total emissions of engines often make it necessary to close the crankcase breather system. In this case, blow-by gasses are routed into the inlet of the turbo charger where they can be burned instead of polluting the environment.
The only routine maintenance required for a Racor Crankcase Ventilation filter system is filter replacement. Typical service life of the high-performance filter in diesel applications is 750 hours. Some variations in service life occur depending on the load profile, engine wear conditions, flow, aerosol mass concentration of crankcase emissions, and soot concentration. The pop-up style indicator on the top of the closed system unit alerts the operator when such a filter change is needed. (A remote indicator is available: CCV55615-01.)
CCV and CV units include stainless steel latches for tool-less element change, a steel housing with an epoxy powder coating, and a drain check valve that allows collected oil to return to the crankcase, significantly lowering oil consumption.
How They work:
Open Crankcase Ventilation System:
Racor’s CV open system filters are high-efficiency oil separators, featuring depth loading, micro-glass fiber Vaporbloc media, capable of coalescing vapor and contaminants down to 0.3 microns. The resulting filtered and coalesced oil is held in a hose line with a check valve, until it is can be released to the oil pan via a hose connection. Filtered gasses are released to the atmosphere. The units are designed to handle a full range of crankcase flow rates up to 50 cfm (1.42 m3/m) or more (using multiple units.) The units feature a unique crankcase pressure regulator with an integral bypass valve. This regulator prevents crankcase over-pressure and under-pressure, preventing damage to seals and oil loss.
Closed Crankcase Ventilation System:
Racor’s CCV closed system filters are high-efficiency oil separators, featuring depth loading, micro-glass fiber Vaporbloc media, capable of coalescing vapor and contaminants down to 0.3 microns. The resulting filtered and coalesced oil is held in a hose line with a check valve, until it is can be released to the oil pan via a hose connection. Blow-by gasses are not allowed to vent to atmosphere. Instead, the cleaned and filtered gases are routed back to the inlet of the turbocharger to be burned in the engine. The units are designed to handle a full range of crankcase flow rates up to 50 cfm (1.42 m3/m) or more, using multiple units. The units feature a unique crankcase pressure regulator with an integral bypass valve. This regulator prevents crankcase over-pressure and under-pressure, preventing damage to seals and oil loss.
Use in Marine Applications:
Marine diesel engines can benefit from the installation of a combination Racor Closed Crankcase Ventilation (CCV) and Air filter/Silencer System. The CCV contains Racor’s high-performance Vaporbloc filter made of depth loading micro glass fiber coalescing media. The marine Air Filter/ Silencers (AF) contain a washable media and are ruggedly built to provide an extended service life.
When installed, the engine crankcase breather is connected to the inlet of the Racor CCV Assembly. The CCV outlet is connected to the engine’s combustion air inlet via an air intake connector where filtered blow-by gas is recycled through the combustion process. Oil collected in the CCV sump is returned to the crankcase through a hose and a drain check valve. See Product Support tab and consult Racor publications 7501 and 7539.
How to Select:
1. Choose open or closed flow system
2. Choose flow rate required:
Crankcase flow rate can be obtained from the engine manufacturer, by direct measurement with a mass airflow sensor, or through an approximate calculation: In a closed system, simply divide the rated horsepower by 40 to get cfm (rated kW/30). In an open system, divide the rated horsepower by 20 (rated kW/15). While various factors can alter the accuracy of this formula, such as modern piston improvements or engine wear, this is usually a good estimation of flow.
Calculate crankcase blow-by flow:
Closed system: divide rated hp by 40 to get cfm. (kW/1000 = m3/m)
Open system: divide rated hp by 20 to get cfm. (kW/500 m3/m)
3. Choose bypass or non-bypass function
4. Choose filter media density/efficiency
5. Inlet on right or left side.
Racor crankcase ventilation units for closed or open systems
High efficiency oil separation down to 0.3 micron
Unique crankcase pressure regulator
Replaceable high performance filter
Depth loading, micro-glass fiber coalescing Vaporbloc media
Steel housing with epoxy powder coating
Drain check valve
Left or right inlet ports
Closed units offer bypass or non-bypass options
Closed units offer pop-up style, or remote indicator of bypass condition
Compatible with flow rates up to 50 cfm (1.42 m3/m)
Continuous operating temperature range -40 to 240F (-40C to 116C)
Optional Kits: See brochure 7790 on Product Support tab:
CCV Fitting/Hose Kits
CCV 90 Hose Adapters
CCV hose Barbs
Bulk Hose Kits
Hump Hose Fittings
CCV8000 Conversion Kits (covert to CCV12000)
CCV Heater Kits
Electronic Remote Filter Gauge
Heavy-Duty Wear Spacers