I believe UTG is not entirely correct in his thinking of how pressure works.
the spring at the bottom of the filter canister pushes the filter element against the top ring, when oil enters the filter and pressurises the filter canister that pressure acts in all directions against the filter case as well as the filter element.
UTG sees that the oil enters the top of the filter and pushes down on the filter element against the spring at the bottom but forgets that the same amount of pressure is also exerted on the bottom of the filter element in an upward direction. This means the only place the oil can flow is through the filter element back into the engine.
Where it gets interesting is how much oil the filter element can flow and how much of a pressure drop happens across that filter element. All engine oil systems will have a bypass somewhere in the system so that if the filter element becomes blocked the engine will still get oil. Most engines these days will use a oil filter that has a build in bypass in the bottom of the oil filter element, many engines also have an internal bypass.
That video just confused me.
He referenced various PSI figures , which to me indicated that an LS1 would never have the bypass closed, so the filter is doing SFA filtering anytime.
The cartridge filter on an Alloytec with the seals at both ends must be a thing of wonder, as there is no bypass spring . Am I correct there ?
I have no doubt your engine will have a bypass somewhere.
