Comparative Performance of 12 Crankcase Oil Mist Separators
Journal Article
03-12-01-0001
ISSN: 1946-3936, e-ISSN: 1946-3944
Sector:
Topic:
Citation:
Golkarfard, V., Subramaniam, R., Broughton, J., King, A. et al., "Comparative Performance of 12 Crankcase Oil Mist Separators," SAE Int. J. Engines 12(1):5-14, 2019, https://doi.org/10.4271/03-12-01-0001.
Language:
English
Abstract:
Closed crankcase ventilation (CCV) systems are required in most automotive
markets in order to meet emissions regulations. Such systems usually require a
separator to recover oil and return it to the sump. Many end users fit improved
separators in order to reduce intake/aftercooler contamination with soot/oil.
This study measured clean and wet pressure drop and filter capture efficiency in
12 different crankcase oil mist separators which are commonly used for either
original equipment (OE) or aftermarket fitment to passenger vehicles and
four-wheel drives (≤200 kW). The filters tested spanned three different
size/rating classes as well as included both branded and unbranded (imitation)
models. In addition to filters, separators (often termed “catch cans”) and an OE
cyclone separator were also examined. Testing was performed under controlled
laboratory conditions using methods equivalent to previous work and current mist
filter test standards. All separators were tested at flow rates between 50 and
250 lpm in both dry and “wet” (saturated with oil) states. Filtration/separation
efficiency was also measured. Separators were compared based on quality factor
(ratio of capture efficiency to pressure drop). A wide range of quality factors
were found; however, in general, the filters were found to be superior to the
catch cans, while the cyclone had the lowest quality factor. The branded filters
were found to be superior in terms of quality factor, mainly due to the fact
that they contained a greater quantity and/or finer separation media compared to
imitation models.