Motrbee MB10575 Filtration Efficiency
100
80
Removal Efficiency(%)
60
40
20
0 20 25 30 35 40 Particle Size( microns)
Motrbee MB10575 Flow Performance
30
Differential Pressure( kPa)
25
20
15
10
2 4 6 8 10 12 14 Flow Rate( L / min)
Motrbee approaches that balance through several components working together rather than relying on a single filtration feature. The first component is the spring-loaded anti-drainback valve. After an engine is shut down, gravity can allow oil to drain from portions of the lubrication system. The anti-drainback valve is designed to help retain oil in the filter and reduce the amount of oil that must be displaced when the engine is restarted.
This is particularly relevant during cold starts, when oil viscosity is higher. Motrbee incorporates a spring-loaded design intended to provide consistent sealing and help maintain oil availability at startup.
A second part of the system is the bypass valve. A bypass valve is necessary because there are circumstances in which differential pressure across the filter can become high enough that maintaining unrestricted oil delivery is more
Motrbee’ s filters are tested by the Southwest Research Institute, an independent research organisation
important than forcing all of the oil through the media. Cold oil, for example, can be considerably more viscous than oil at normal operating temperature. A filter approaching its contaminant-loading limit can also experience greater restriction. Motrbee uses OEM-calibrated bypass valves and adds a 32-micron steel mesh guard that provides additional protection when the filter is operating in bypass mode. This is an important distinction in the Motrbee design. Bypass operation is not treated as an isolated valve function; the bypass path and protective mesh are considered part of the overall filtration system.
The filter housing also has to survive the mechanical environment of an operating engine. Motrbee’ s current
38 The Engine Rebuilder Issue 06