Abstract: An adapter 10 for connecting a bypass oil filter to an internal combustion engine 14 having a full flow lubricating system is mounted between the oil filter mounting block 12 and the conventional full flow filter 16. The adapter includes means 48, 52 for diverting a portion of the circulating oil flow to the bypass filter and means 46, 74, 76 for returning that portion to the engine. The adapter includes a body portion 36 and an insert 60 which together define the passages necessary for diverting a portion of the oil flow to the bypass filter. The body includes a central axial 38 opening which receives the insert, the body and insert together defining an annular chamber 76 which receives clean oil from the bypass filter through a radial passage 46 in the body.

Abstract: An adapter for connecting a bypass oil filter to an internal combustion engine having a full-flow lubricating system is mounted in place of the conventional full-flow oil filter. The adapter includes a body portion which defines three interconnected passages. A first passage provides for the flow of dirty oil from the adapter to the bypass filter, while a second passage provides for the return of the filtered oil to the engine. A third passage extends between the first and second passages and allows most of the dirty oil to flow directly back to the engine. By providing a return tube with an outlet downstream of the junction of the second and third tubes, the bypass filter experiences a maximum pressure drop increasing the amount of oil flowing therethrough.