Oil Pump
As far as a HV pump sucking the pan dry, well that is a possibility in some situations. How is it possible you ask? Well have a look at the GPM .
Stock 4.9
HV or HP 6.2
That's a 26.5 percent increase
As you increase the pressure, which HV pumps do, you also increase the GPM. More pressure squeezes more oil past all the little restrictions in the engine.
That extra oil has to make it's way back to the pickup.
So if your running close to oil starvation, with a stock pump, then going to a HV may just create an issue.
That's something to think about.
It’s not possible. So let’s break it down.
1. Fluids are incompressible. So the oil will not compress. Of course, there is (and shouldn’t be) entrained air in the oil and that will make it somewhat compressible.
2. Pressure is resistance to flow. Nothing more.
3. Any hydraulic systems total flow is controlled by the number of leaks, and the amount of each leak combined. You can’t force more oil past a leak because...see #1.
4. Once you have pressure, the total flow through the system remains very close to the same. That’s accounting for the entrained air.
So it’s IMPOSSIBLE to “suck” a pan dry just by the installation of a high volume pump. If the stock pump is 4.9 GPM (taking your word for it since you posted it) we know that the OE system, with all its leaks and clearances flows less than 4.9 GPM. The only way to make it flow more GPM is to add leaks, increase the volume of the leaks or both. And we know the OE system flows less than 4.9 GPM because the bypass opens. You can see it on the gauge. If the bypass didn’t open, the pressure would continue to increase with RPM. And it doesn’t. Pressure is resistance to flow.
Now, you can bolt a 165 GPM pump on there and the total system flow will be...that’s right, less than 4.9 GPM unless you add more leaks, increase the volume of the leaks or both. What will happen is the bigger pump will have a higher pressure sooner because the full volume of oil of the system uses will be reached at a lower RPM.
But the volume of oil moving through the system stays the same. Of course, system pressure will increase with RPM until the bypass opens. If the bypass is set to open at the same pressure then that’s all the pressure you will get. It will just open the bypass sooner.
You can dead head the bypass if the volume of the pump exceeds the volume potential of the bypass. Then the pressure will increase with RPM until the filter blows off. There is an added leak.
Unless there is a mechanical issue like the pickup isn’t the correct distance from the floor of the pan it isn’t possible for any pump to suck any pan dry.
Of course, on here you need to account for any possibility so I have to point out that an engine can retain oil. It is more a function of RPM that oil pump volume. If the oil is retained in the engine somewhere and not getting to the pan, you can have the pan go dry.
That’s not a pump issue. That is a mechanical issue.
So for all the misinformation and fear mongering a high volume pump can’t suck a pan dry unless you have some mechanical issue.
