oil filters interchange

[larrym]

- is the relief setting significant

& if so, WHY?

Fram PH2815 early 911 914-6 etc
Filter Bypass Relief Valve: No
Relief Valve Open (psi): 19-37 psi
Anti-Drainback Valve: Yes
Smallest Particle Filtered: 18 microns
Thread Size: 3/4-16 in.


Fram PH8A - suggested interchange
Filter Bypass Relief Valve: Yes
Relief Valve Open (psi): 12 psi
Anti-Drainback Valve: Yes
Smallest Particle Filtered: 20 microns
Thread Size: 3/4-16 in.

PH2842 2.7- 3.2 engine
Anti-Drain Valve YES
Relief Valve Setting PSI 28
Thread Size: 1-12

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[TOM RUE]

Don't use fram filter use wix fram is a crappy filter ...i know

[HarryD]

Save your self heartache, get a MAHLE.

[RSTarga]

+1 mahle

[996TWINS]

+1. +1. Mahle!!!

[DRACO A5OG]

I posted a comparison between wix and mahle, constuction was close but due to wix filter it was too restrictive ( cleans too well, it restricts flow) and caused engine to get hotter faster. stick with mahle.

[Jdub]

This saving of a few dollars is what you would do if you were driving a 1976 Toyota SR5.

[dw1]

++1 on Mahle.

Fyi, when doing a tune up & changing filters, I just put in an order for all the items I need to the friendly & helpful folks at Pelican Parts.

[Noah930]

Regarding using a Fram:

On one hand, when I go to vintage races, I see a lot of those Ferrari guys (the ones with the 7-figure models) with Fram filters. On the other hand, a few years back a guy on a motorcycle board cut up several filters and noted that the Fram's filter media (or perhaps it was the material at its base) was made up of some crappy cardboard-like material that disintegrated after use. That would actually be worse than no filter at all, as now there were particles of stuff floating in the oil supply.

Since then, with so many choices on the market, I avoid Fram at all costs. Why reinvent the wheel? Go with the Mahle. The guys who run the shops that service these cars seem to univerally use the Mahle. They see far more Porsche engines than I do.

[redstrosekNic]

Mahle or Mann.

[BlueWing]

Why such a bad rap for Fram? I drove 3 VW Diesels for a total of 1.25 million miles.
I used exclusivly Fram filters and Castrol GTX 20/50. I never did anything to them other than routine maintenance. Never had a head off, never added any oil between changes, only the 86 with hydraulic lifter wound up with some high blow by at around 400,000 miles and I still have that motor for a different project.


However in my SC I do use only Mahle or Mann and Valvolene Racing oil. The cost of a 1.6 VW Diesel engine compared to the Porsche 3.0 is quite different. So for the SC I use the advise offered here.

Terry

[larrym]

original question - why is there a difference in relief valve settings?

i get the product zealot issues, and i'm not asking cuz i am looking for cheap

- and i also understand that if you run a filter for a zillion miles (or simply beyond its recommended service life) or just let it sit on a trailer queen for 10 yrs, it might certainly disintegrate internally

(anti-drainback feature is irrelevant when the filter is mounted horizontally as on a 911 914-6 oil tank)

?????????????????????

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[DRACO A5OG]

Sorry Larry,

Did not mean to sound like we were flaming you. As for me, I too was curious why the Wix filterred so well in microns vs Mahle. What I discovered, the Wix filter worked too well where it would restrict the flow and as a result a raise in temps, since I use to have crushed lines it made the higher temps in summer worse.

As far as the "relief" settings, I choose Wix because it was close to OEM/Mahle. I am not sure if the relief settings is critical unless it is too tight where it would restrict flow

[HarryD]

I have been told by those who have witnessed all kinds of engine failures, the real answer of why most mass market filters are not ok for the Porsche flat 6 engine. It has to do witht he operating pressure of a 911 which is some what higher than your typical application, Has something to do with how the scavenge pump operates at higher revs.

[HarryD]

This is an interesting thread on the topic: Seattle Pelicans help me find an oil filter

Check this comment:

Originally Posted by Steve@Rennsport

FWIW,..I used to keep 2, 50 gallon garbage bags full of American (Purolator-Hastings-Fram-Wix, etc) oil filters that I'd removed from 911's to show my customers, but I ran out of room to store them.

Some failed from split cases, some failed when the baseplate separated from the case, some had faulty pressure relief valves, and some had poorly designed anti-drainback valves.

I've never seen a German Purolator, Mahle, or Mann filter do any of these things.

If the filter fails, you'll not know anything until its too late,..................

IMHO, nothing beats a Mahle filter and its not worth risking a 911 motor over it.

(I do use Mobil 1 filters or Wix on domestic cars w/wet sump lubrication systems without any issues)

[chrismorse]

some time ago, i serviced my car, looking forward to getting it on the track again. I installed a fram filter, (received from PO and put in redline 20-50)

With the car warmed up, things were going well. temps within reason, then i noticed 20-25 psi oil pressure at 5k rpm. so i came in and let the car cool off. Went back out but the pressure was not normal, still low.

Nursed the car home, did all of the usual checks, (pressure relief disassemble & clean, mechanical gauge confirmed low oil pressure, so i changed oil and filter and pressure was restored.

I decided to have a look at the oil filter -



chris

[PCA7GGR]

Many moons ago, I shared this race car with a partner:


On my first lap of my first run session on a cold Laguna morning, I got a face full of oil coming out of T2 (note the air exit on the hood for the front mounted oil cooler). The secondary Fram oil filter mounted in the front trunk had blown apart. I pulled off the track, was towed in, we replaced the oil filter (with a Mann a fellow PCA loaned us), cleaned up the oil on the car and my partner took the car out.

Unfortunately, at the top of the corkscrew, an oil line let go on the engine. He then proceeded to dump oil on the line all the way to T10. It took over an hour to clean up the mess.

For over a year, we were know as "The Captains of the Exxon Valdez".

[Reiver]

Fram ain't what it use to be, like lots of products....some Ferrari guys use them because back in the day they came with the dual fram filters and they like to see that orange can(s) in a concours.
They prob work ok in low psi systems but I won't put them on anything.
Great pics and stories.