mjperzem, no to pojechałeś. Przestań szukać w necie, a poprostu logicznie pomyśl. Jak bypass może zwiększyć ciśnienie?????
Tu masz wytłumaczenie po co jest bypass, niestety in english (sięgnąłem po wujka google`a po zaczęliście robić mętlik w mej głowie):
The bypass flow circuit ensures oil flow to the engine when there is a significant restriction across the filter due to element plugging or cold start conditions. Typically, engine manufacturers design bypass valves to open at a pressure differential of approximately 10 to 30 psid with some as low as 4 psid (28 kPad), and others opening as high as 75 psid (500 kPad). Some engine manufacturers locate the bypass valve in the filter mounting base on the engine, while others locate the valve within the filter. Either way, the same purpose is served.
Oil filters are designed to withstand differential pressures significantly greater than those experienced under normal operating conditions. Therefore, when a center tube or element has collapsed, it is usually the result of a sticking or otherwise malfunctioning bypass valve.
In some instances, a sticky filter bypass valve alone is not enough to collapse the center tube or element. The oil pump pressure regulating valve may also stick in the closed position, which results in increased pressure and oil flow through the filter. Although this condition may be only momentary, it can quickly collapse the center tube if the bypass valve fails to, or is unable to, relieve the excessive differential pressure.
A collapsed center tube or element can lead to a loss of filtration and oil flow to the engine. There is the possibility that interior parts of the filter or filter media may be physically displaced and could migrate into the system interfering with the oil flow. Additionally, debris and contaminants that are held by the filter may be released.
The malfunction of the filter bypass and oil pump pressure regulating valves and the subsequent collapse of the center tube or element may not cause noticeable damage. However, at times it can result in a catastrophic failure of the engine caused by the seizure of a piston, connecting rod or main crankshaft bearings among other failure possibilities.
The malfunction of filter bypass valves and pressure regulating valves has been traced to:
Sticky surfaces caused by cold, highly viscous oil
Oil contaminated by excessive condensation, coolant or oxidation
Neglect - extended oil drain and filter change intervals
Carbon grit that temporarily jams a valve
Sudden acceleration of the engine with any of the above conditions.
A TUTAJ OBRAZKI DO TEGO POWYŻEJ:
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Reasumując:
BYPASS zabezpiecza silnik przed "zapaścią" filtra, czyli jak filtr nie będzie drożny i nie przekonujcie mnie, że jak jest zimny silnik to olej nie jest filtrowany.
Jest też coś takiego jak BYPASS OIL - czyli dodatkowe smarowanie. Część oleju idze przez filtr, a część leci bokiem - w jednostkach, w których jest potrzebna większa wydajność smarowania.
Tutaj oryginalny tekst:
http://www.machinerylubrication.com/...ne-oil-filters
Ale przynajmniej się czegość nowego nauczyłem :-)