PF35L (L is for long) about the size of a K&N 3002


David

 

As a side note, I just bought the camaro 94z a couple months ago. The oil had been changed right before I got It. I was having the problem of oil pressure dropping @ wot. I searched and saw some had solved it by changing filters. It had a delco filter on it so I figured It wouldn't work for me. I changed to syn oil and napa 1060 filter yesterday morning, and the oil pressure now climbs solid @ wot. I made several wot runs and it didn't drop once.

 

I thought the PF35 and PF35L (L is for synthetic filter medium; PF25 was the short filter, PF35 was the long filter) designations were discontinued several years ago. But you can still find people advertising the PF35L.

Consider these:

http://www.moroso.com/catalog/catego...?catcode=20002

 

Fram HP4

 

I love my Mobil 1 302

 

Do a search for fram filters if you want your motor to last...

 

I did a search and found no hard evidence that changes my mind. Ran a HP4 for almost 5 years and 29k miles. Oil changes every 3k with royal purple. Debate the oil all you want too, never had a problem with it either.

 

bigger filter = more flow and more oil

more flow and more oil are never a bad thing. only downside is the filter hangs down more than normal, but my header collectors are still lower so i dont really care.

unlike the last guy said i didnt notice a difference in oil pressure, if anything it went up.

 

See that's the thing about pressure and volume, the are inversely proportional. If the flow goes up the pressure goes down, if by flow you mean volume of oil flowing through the engine. PV=nRT, if nRT are exactly the same, which they should be, then when volume rises, pressure drops, just the way things work . You wont notice a pressure drop because it's not a giant increase in volume. The whole point of a bigger filter is to provide more oil capacity, which should also keep the oil cooler since the heat from the motor is spread over a bigger area.

 

Must be a new discovery in the field of fluid dynamics. PV=nRT is the perfect gas law, applicabe to gasses, which are compressible. It has nothing to do with liquid state flow. Oil is an incompressible fluid. The oil pump is (very close to) a fixed displacement device, and for all practical purposes, the flow rate is always proportional to RPM. Hence, the pressure in the system is determined by the resistance to flow of that flow rate. Tight bearing clearances, increased viscosity, etc will determine the back pressure on the flowing oil after it leaves the pump.

Volume of the oil filter also has nothing to do with the pressure in the system.

 

i ran a fram once and my oil pressure was noticeably less

 

If you want to keep running an oil filter with cardboard endcaps that are just glued into place thats up to you.

 

What he said, if anything a larger oil filter will raise the oil pressure due to less restriction from the oil going through the filter.

 

this might be theroretically true if the pressure sensor was between the oil pump and oil filter.

 

Yea I know, I was sick this weekend my mind was somewhere else. What I meant to say was that if the "flow" was increased, meaning the resistance to flow was decreased, then the pressure would drop. Pressure is a representation of the resistance to flow. The bigger filter should have less resistance because there is more filter area to allow the oil to pass through. I know it's not a noticable difference, but theoretically it should drop pressure slightly.