tmsperformance;1821692 said:
Pressure goes up as flow goes down and filtration goes up. Just as a supercharger on a stock engine might see 10psi. Take that same engine, port the head with valve job, change nothing at all besides that. Reinstall the supercharger and the same setup will see probably 6psi with more power than the prevoius setup. Why because the head is flowing more which means the pressure aka resistance to flow will go down. Trust me I know I was in that exact position. Its fluids dynamics 101, I'm not saying the filter is no good, actually saying the filter is actually filtering better. Just not flowing as well.
Actually, that is backwards: Increase in flow falls as pressure rises - that occurs at a specific point, depending on the fluid. Using the supercharger example, it occurs at critical mach (velocity) for air at a specific density. Up to that point flow will increase with little pressure increase - after critical mach, pressure increases exponentially with much smaller increases in flow. You might want to review Fluid Dynamics 101 before you debate me on that subject
Oil is a much denser fluid and behaves differently than air since liquids have no real compression factor. Hence, any resistance to flow will have an immediate/direct impact on pressure and flow is much more limited by pump capacity/pipe size. You need to pay attention where the pressure sensor is placed before you make statements about flow...i.e increase in pressure is caused by resistance downstream of the sensor. The facts on the 7M oil system:
- Oil path is directly from the pump to the filter. Then from the filter to the main oil channel.
- There is a relief valve incorporated on the pump and there is a bypass valve in the filter. Both are there as safety measures to prevent over pressurization of the system or if the filter media is blocked.
- If the filter has more resistance, the pump relief valve can actuate and will dump oil directly to the pan. If there is less resistance at the filter, there will be increased flow to the main oil channel along the block - there will be increased flow to the turbo as well.
- Resistance to flow at the oil channel is determined by by the bearings and the oil squirters. If there is increased flow to the oil channel (caused by less resistance at the filter), you will see a slight increase in pressure (at the sensor) due to the bearing/squirter resistance downstream.
This is what the oil pressure sensor is seeing. You do not have an oil pressure sensor pre-filter, so you cannot determine if the filter is showing more resistance or not. In addition, synthetic media in an oil filter is by its nature/properties is less resistance to flow than cellulose (paper). As a result, synthetic media tends to be less efficient at first in removing particles - it depends on it's density. This changes fairly quickly as synthetic media "loads up" with particles - it becomes as efficient or better than cellulose. The big advantage synthetic media has is capacity - it will hold 2-3 times the particles before blocking up and causing the filter to go into bypass.
