When combined with the smooth radius die-cast back plate, this open filter can feed a large displacement engine with an unobstructed flow of clean air. Two-stage filters are often incorrectly referred to as by-pass filters and should not be confused with lube filters that have an integral by-pass valve or that are kidney loop style by-pass filters. The open-face filter design of the Screamin’ Eagle ® Extreme-Flow Air Cleaner Kit provides 60 more filtered surface area to flow 11 more air than a traditional perimeter high-flow filter. It is only after sufficient loading with contaminant that the flow through the higher-efficiency by-pass media will increase. This translates to longer periods of time delivering dirtier oil to the engine. Another downside of two-stage filters is that the more efficient by-pass portion of the filter inherently has higher restriction, initially driving most of the flow through the lower-efficiency full-flow media. This may lead to increased engine wear that could result in premature repairs or even engine replacement. Poor cold flow performance may result in by-pass valves remaining open for longer, depriving the engine of clean oil during start-up and leaving the engine temporarily unprotected. The two-in-one design significantly increases restriction, causing shorter filter life and decreased cold flow performance. Some manufacturers have introduced two-stage (or combo) filter designs in attempts to combine the features of both a full-flow and by-pass filter into one unit. This process improves oil cleanliness without compromising the oil flow through the engine. A by-pass filter has the added advantage of increasing the oil capacity of the engine and incorporates highly efficient media to polish the oil before it returns directly to the sump. By-Pass Filtrationīy-pass filters do not supply the engine with clean oil directly but sit off to the side as a separate circuit or as a kidney loop unit generally accepting only a very small portion of the total oil flow. Full-flow filters may also incorporate a by-pass valve. Synthetic media such as Donaldson Synteq™, provides finer filtration, low initial pressure loss, and increased dirt holding capacity over traditional cellulose filter media. Providing essential engine protection, full-flow filters must capture and retain damaging contaminants and have adequate dirt holding capacity to achieve the required service intervals. Full-flow filters are the most common type, receiving and cleaning all the oil before it’s pumped through the engine.
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