Oil filter flow and filteration

[tblt44]

I just switched from a/c delco classic to purolator one filter on my truck.
Question is I tow a travel trailer and when I do I tow in 3rd gear pushing 3k rpm for hours with a 5.3 V8.
Looking inside the filer it just doesn't look like it will flow oil thru those tiny slots like the a/c delco would with the larger holes.
I don't want to starve any part of the engine from oil.
I had bought a bosch and the fins inside went punched out much and I just cut the filter open.
I'm draining oil out of my ac delco filter and will cut it open and try to do a flow test thru the center tube holes with water later this weekend.

 

[PimTac]

How will you measure the flow?

 

[shibby6600]

If the oil pressure hasn't changed between the two filters it's very likely there's no restriction in the output side of the filter. Almost all oil pumps are constant displacement, they will flow the same amount regardless of the head restriction/pressure.

 

[tblt44]

I was going to disassemble both including all filter media.
Pour water into the center tube at the same rate.
Looking at the very small slots in the purolator Just seams the ac delco would flow way better

 

[tblt44]

Originally Posted by shibby6600
If the oil pressure hasn't changed between the two filters it's very likely there's no restriction in the output side of the filter. Almost all oil pumps are constant displacement, they will flow the same amount regardless of the head restriction/pressure.


Hot flow oil pressure has not changed.same as ac delco filter

Am I paranoid because many bash the purolator on here

 

[kschachn]

Originally Posted by tblt44
Am I paranoid because many bash the purolator on here

Do multiple posts showing separated and torn media constitute "bashing" them? That's pretty much what I've seen on here, not a lot of unsubstantiated complaints.

 

[ZeeOSix]

Originally Posted by tblt44
I had bought a bosch and the fins inside went punched out much and I just cut the filter open.

I'm draining oil out of my ac delco filter and will cut it open and try to do a flow test thru the center tube holes with water later this weekend.


Anyone buying a filter with louvers in the center tube needs to inspect those louvers to ensure they are opened up well. I've posted photos of many examples of good vs badly formed louvers.

The main pressure drop (ie, flow restriction) in an oil filter is caused by the media. Only time a center tube could cause lots of flow restriction is if there are not enough holes that are big enough, or if louvers are almost totally closed (ie, bad louver formation).

Your water flow test will tell you nothing.

 

[ZeeOSix]

Originally Posted by tblt44
Originally Posted by shibby6600
If the oil pressure hasn't changed between the two filters it's very likely there's no restriction in the output side of the filter. Almost all oil pumps are constant displacement, they will flow the same amount regardless of the head restriction/pressure.


Hot flow oil pressure has not changed.same as ac delco filter

Oil pressure sensors are almost always located after the oil filter. So what the sensor is essentially measuring is the oil flow (as a function of pressure) at the location of the sensor.

As shibby6600 mentioned, if the pressure is the same then the flow is the same. If you see the same oil pressure at say 5000 RPM with hot oil then the flow volume of oil going into the oiling system is the same.

The only way you can see if Filter A is more restrictive than Filter B is when the positive displacement oil pump is in pressure relief, and that rarely happens with hot oil except maybe at engine redline RPM.

 

[Linctex]

Originally Posted by ZeeOSix

Your water flow test will tell you nothing.


I will guarantee his "flow bench" is NOT big enough.

You will find that tiny little tube (even with louvers) will flow about 50 GPM of water at 50 PSI !!!

Basically ................................ you are worried over nothing.

 

[Linctex]

Originally Posted by ZeeOSix
if the pressure is the same then the flow is the same.
If you see the same oil pressure at say 5000 RPM with hot oil then the flow volume of oil going into the oiling system is the same.


100% correct

 

[tblt44]

I just cut the Bosch apart that thing flows so good with all them little slots even though some of them are punched out all the way no need to do a flow test garden hose all the way flows good

 

[tblt44]

Originally Posted by Linctex
Originally Posted by ZeeOSix

Your water flow test will tell you nothing.


I will guarantee his "flow bench" is NOT big enough.

You will find that tiny little tube (even with louvers) will flow about 50 GPM of water at 50 PSI !!!

Basically ................................ you are worried over nothing.



Your right great flow thru the little luvers

 

[ZeeOSix]

Need to calibrate your eyes to read and distinguish good vs bad louver formation. That Bosch you posted in another thead had very open louvers - you can see the media through them.

 

[kschachn]

Please post some pics of your testing.

 

[tblt44]

Originally Posted by kschachn
Please post some pics of your testing.


All I did was put a garden hose through the center hole and open it up and it flowed beautifully full pressure no water came out the hall

 

[tblt44]

Originally Posted by Linctex
Originally Posted by ZeeOSix

Your water flow test will tell you nothing.


I will guarantee his "flow bench" is NOT big enough.

You will find that tiny little tube (even with louvers) will flow about 50 GPM of water at 50 PSI !!!

Basically ................................ you are worried over nothing.



Your right great flow thru the little luvers

 

[tblt44]

Pic

 

[PimTac]

🛥🎣

 

[tblt44]

This was the very first filter I've cut open $5 for peace of mind that my other pure ones are flowing well is worth it
I now see that the filter media is more of an issue flow than the actual holes in the center

 

[shibby6600]

I give you credit for opening up and at least trying something, no matter how many people say it was unnecessary. Many people stop at the theory and don't bother trying to convince themselves what they believe is true or false.