Thanks for yor reply. I was referring to the BMK-13 diagram shown by ck42 and applicable to those of us that have spin on oil filters. It seems to me from the picture that since the bypass and full flow filters operate in parallel in this set up, and the intake and exit pressures differ by the pressure drop across the lines, then the effective pressure across the bypass filter seems to be rather small. An electric analogy may work here, if you have a small resistor (full flow) in parallel with a large resistor (bypass) the current division states that most wil flow through the full flow with the voltage drop (pressure differential) being the same across the two elements. So, when compared with the set-up of outlet return to the sump I think that the effective pressure is the oil pressure minus crankcase pressure. This effective pressure seems to be significantly higher than the BMK-13 set up, and since the bypass offer significant restriction to flow due to its arrestance rating (1 micron?) it would seem to me that it would work/flow better and clean faster with a higher effective pressure. Can somebody shed some light on this observation please? Thanks.
91 300E 190K
81 911SC 210K
61 MB 190C 90K - sold...sigh.
70 914-6 - DUI victim - sigh
911T - Fire victim
Renault Dauphine '62
67/Cougar GT;70 Challenger 440 Mag
www.wetstart.com - OEM future option coming soon