Modified full-flow filter and by-pass filter apparatus for internal combustion engines

Claim 1

Filter apparatus for an internal combustion engine adapted for replacing a normal spin-on full-flow oil filter threadably connected to an oil filter bushing, said engine having an oil pan at a low pressure side of an oil system having an oil pump, said apparatus comprising: a modified high performance full-flow filter adapted to be connected to said oil filter bushing to permit oil within said oil system to flow into said modified full-flow filter and to permit most of said oil to flow outward therefrom after filtering thereof by said modified full-flow filter, said modified full-flow filter being further adapted to permit a small portion of said oil to flow outward therefrom prior to filtering thereof through a by-pass bushing located along a centerline of said modified full-flow filter opposite said oil filter bushing; a by-pass filter for filtering said small portion of oil, said by-pass filter having a base plate connected thereto; a first flexible hose member adapted to be connected on a first end thereof to a first fitting and being adapted to be connected on a second end thereof to a second fitting, said first fitting being adapted to be connected to said by-pass bushing of said modified full-flow filter and said second fitting being adapted to be connected to said base plate for permitting flow communication of said small portion between said modified full-flow filter and said by-pass filter; a second flexible hose member adapted to be connected on a first end thereof to a third fitting and being adapted to be connected on a second end thereof to a fourth fitting, said third fitting being adapted to be connected to said base plate and said fourth fitting being adapted to be connected to said oil pan for permitting flow communication of said small portion between said by-pass filter and said oil pan; and means for mounting said by-pass filter with respect to said engine, said modified full-flow filter and said by-pass filter being of such respective densities and filtering capabilities that said most of said oil flows from said oil pump through said modified full-flow filter to be filtered therein with a minimum pressure drop and said small portion of oil from said oil pump flows through said modified full-flow filter to be filtered by said by-pass filter prior to returning to said oil pan; a least one of said first, second, third and fourth fittings being a right angle fitting that may be rotated after fluid tight connection to give a right angle fitting oriented in any direction in a given plane.

Claim 8

A method of retrofitting an engine to provide for by-pass oil filtering of a small portion of oil flowing from an oil pump of said engine, said method consisting of the following steps: removing a spin-on full flow filter from an oil filter bushing; replacing said spin-on full-flow filter by threadably connecting a high performance modified full-flow filter to said oil filter bushing; mounting an independent by-pass filter with respect to said engine, said by-pass filter having a base plate connected thereto; first connecting an inlet side of said by-pass filter through said base plate to a forward end of said modified full-flow filter by a first flexible hose member to receive therethrough said small portion of said oil flowing through said modified full-flow filter; second connecting a discharge side of said by-pass filter through said base plate to an oil pan of said engine via a second flexible hose member; and replacing a normal drain plug with a special drain plug having a fluid tight, rotatable right angle fitting, said special drain plug being adapted to connect to said oil pan allowing oil from said by-pass filter to flow through said right angle fitting back to said oil pan.

Claim 9

A method of retrofitting an engine to provide for by-pass oil filtering of a small portion of oil flowing from an oil pump of said engine, said method consisting of the following steps: removing a spin-on full flow filter from an oil filter bushing; replacing said spin-on full-flow filter by threadably connecting a high performance modified full-flow filter to said oil filter bushing; mounting an independent by-pass filter with respect to said engine, said by-pass filter having a base plate connected thereto; first connecting an inlet side of said by-pass filter through said base plate to a forward end of said modified full-flow filter by a first flexible hose member to receive therethrough said small portion of said oil flowing through said modified full-flow filter; second connecting a discharge side of said by-pass filter through said base plate to an oil pan of said engine via a second flexible hose member; and replacing a normal drain plug with a special drain plug having a fluid tight, rotatable right angle fitting, said special drain plug being adapted to connect to said oil pan allowing oil from said by-pass filter to flow through said right angle fitting back to said oil pan.