most engines put out a flow of 5gpms
I can't even change my own air filter on this engine let alone pull the oil pan off!quote:
Originally posted by Chris A:
I don't see how a filter could effect the oil pressure at all. Let's take it to the extremes. If you are running no filter, you will get max flow and therefore max pressure. If you have a clogged filter, the bypass valve will open allowing full flow to the bearings. This is especially true since your pressure is remaining the same as the pump is spinning faster. This tells me that your pump is bypassing oil back into the pan via the pressure relief spring.
What I think you need to do is pull the pan (or is it easier to pull the engine on those LT1 F-body's) and put a sensor on the bypass valve to a light on your dash. That way, you could see when it is in bypass mode and we wouldn't have to speculate about anything. Then we could each send you a filter brand of our choice and a qt of your favorite oil and let the testing begin. So, are you up for it?
Really, lets give him something that's not so much work. He should just go to a remote filter with a pressure tap on the inlet and outlet. As long as the differential pressure is less than the bypass setting of the filter we can assume it's filtering.quote:
Originally posted by Chris A:
I don't see how a filter could effect the oil pressure at all. Let's take it to the extremes. If you are running no filter, you will get max flow and therefore max pressure. If you have a clogged filter, the bypass valve will open allowing full flow to the bearings. This is especially true since your pressure is remaining the same as the pump is spinning faster. This tells me that your pump is bypassing oil back into the pan via the pressure relief spring.
What I think you need to do is pull the pan (or is it easier to pull the engine on those LT1 F-body's) and put a sensor on the bypass valve to a light on your dash. That way, you could see when it is in bypass mode and we wouldn't have to speculate about anything. Then we could each send you a filter brand of our choice and a qt of your favorite oil and let the testing begin. So, are you up for it?
Leo, that's partially correct. Some filters have bypass valves. Others don't. Some engines have this valve on the engine in which case a filter bypass isn't required. It isn't anything special, as has been talked about already, it's just a spring. When the pressure differential between the supply and ouput sides of the filter exceed the spring's tension it's pushed open to allow excess oil to bypass the filter. The filter's bypass valve affects total flow but much less than the oil pump and its relief valve. It mainly controls how often your filter is letting unfiltered oil past vs. restricting flow when the oil is cold.quote:
Originally posted by pedaltothemetal:
I just got back from Kragen, and asked the head tech over there if using a longer filter NOT designated for your car is safe. He said all the oil filters have a regulator in them. This regulator is what sets the oil pressure to your engine specs. If you put in another filter not specified for your engine, you could have oil pressure too low at given engine loads and damage your engine. With that said, I bought the smaller Pennzoil filter cross referenced for our PF44, which is the PZ48. The Fram would be the TF3506.
BTW the K&N was a 1007 they had.
Leo
Hi Dave,quote:
Originally posted by OneQuartLow:
Leo, that's partially correct. Some filters have bypass valves. Others don't. Some engines have this valve on the engine in which case a filter bypass isn't required. It isn't anything special, as has been talked about already, it's just a spring. When the pressure differential between the supply and ouput sides of the filter exceed the spring's tension it's pushed open to allow excess oil to bypass the filter. The filter's bypass valve affects total flow but much less than the oil pump and its relief valve. It mainly controls how often your filter is letting unfiltered oil past vs. restricting flow when the oil is cold.
David
quote:
Engine lubrication is supplied by a gerotor type oil pump assembly. The pump is mounted on the front of the engine block and driven directly by the cranshaft sprocket. The pump gears rotate and draw oil from the oil pan sump through a pick-up screen and pipe. The oil is pressized as it passes through the pump and is sent through the engine block galleries. Contained in the oil pump assembly is a pressure relief valve that maintains oil pressure within a specified range (not noted). Pressurized oil is directed through the lower gallery to the full flow filter where harmfull contaminates are removed. A bypass valve is incorporated into the oil pan which will permit oil flow in the event the filter becomes restricted. etc etc
But my pressure isn't dropping at full throttle, it's simply staying where it was before. I've also heard that as long as I have better than 10psi for every 1500rpm, I'm safe. Sounds like I have no worries here.quote:
Originally posted by mebanditws6:
Patman,
I'm starting to think your oil pressure drops at WOT don't have anything to do with the filter.