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Discussion Starter #1
My bro-in-law and I cut open his frame mounted 2 micron Pre OEM Racor
(R60) filter at 10,000 miles. Photos at:
http://community.webshots.com/photo/86589312/93440727cYcYFJ
http://community.webshots.com/photo/86589312/93447742HNHOzK
This filter also shows no banding or striping - just even usage of
the entire filter media.

It is the same frame mounted set up as OC_Dmax. When we cut this
frame mounted primary filter open, I did not see the characteristic
banding and it appeared that it was uniformly covered with fuel even
though working under a vacuum. Perhaps this could be part of the
reason why OC_Dmax fuel sample was so exceptionally clean. My
thoughts are that the frame mounted pre OEM filter whether it be
CAT or Racor lays BELOW or at the level of the diesel in the fuel tank.
I think this is the reason that the entire filter and medium is "full" of
fuel all the time and hence we don't see stratification or banding
when those filters are cut open. This is not the case when we
cut the OEM or under airbox fuel filters except when there is a lift
pump used and we change from a vacuum to a pressurized fuel
system. Aren't the lift pump advocates claiming that their filters do
better because the filter canisters always "full" and completely
immersed with the passing fuel?

A bear replied on TDP:
My thoughts exactly. I also feel that a filter that is not completely
filled on the dirty side will produce a sloshing effect during driving
that would wash the dirty side and and reduce efficiency. I often
wonder if Racor tested the OEM under our conditions. This may
be the reason it does not perform as it should.


Also, keep in mind that Racor will soon be coming out with an
aftermarket frame mounted filter pre-OEM for our trucks. Have they
been reading between the lines on our filter experiments and figgered out the best option? Looks like
I will not need a lift pump after all.


Hoot.... maybe, you'll never be able to get those desired fuel test results.
Edited by: 56Nomad
 

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56Nomad said:
Hoot.... maybe, you'll never be able to get those desired fuel test results.
I'll do a filter change after the truck gets put back together. Then I'll do an all out perfect flush and keep things clean. Whatever the results, I'll give you to add to the database. Keep up the good work 56Nomad!

BTW: I looked at the OEM filter pics and saw no rust. I sure hate the way they glue that bottom on though. The S-Series Racors that we are using as secondaries are a huge step above the OEM..

No chance of the bottom cover falling off... it's held in place big time...

Edited by: hoot
 

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What makes you guys think that suction side filters aren't full of fuel? Later! Frank
 

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Discussion Starter #4
I just changed out my filters...... also moving the
filter under the frame.

What also strikes me is the amount of crap
that made it thru the OEM and was caught
by the Post OEM YIKES!

No rust in either canister to be seen. Notice the
stratification with Post OEM Racor. That was not
the case with my Brother in law's Pre OEM mounted
on the frame.



Edited by: 56Nomad
 

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Looks like the post Racor could go a lot further. Later! Frank
 

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56Nomad,
Thank you for sharing superb work..... Yes, pretty graphic in terms of what goes through the OEM as seen in the post OEM..

George Morrison
 

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56Nomad,

Are you staying post OEM but frame mounted?

Edited by: hoot
 

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56Nomad,


Very graphic representation of what we must stop with add-on filtration because the OEM filter sure won't.
 

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Discussion Starter #9
Frank Blum wrote:
"Looks like the post Racor could go a lot further."

Yes Frank, I agree with you. No reason why the OEM
can't go till 20,000 miles. However, prudent owners
will probably follow the GM recommendation to change
at 15,000 miles.

 
George Morrison wrote:
"Thank you for sharing superb work..... Yes, pretty graphic
in terms of what goes through the OEM as seen in the post OEM.."

George, my small contribution does not come close to all the
help you have provided.

 
hoot wrote:
Are you staying post OEM but frame mounted?

Hoot, this morning I had my 2 micron Racor assembly hanging
as a Post-OEM filter. This afternoon I moved this assembly to hang
on the frame as a Pre-OEM filter. No one has produced better
filtration numbers (without a lift pump) with this set up. It
really was easy for me to do, as I originally had installed this
system on the frame rail.

I will now need to change out this Pre-OEM every 10,000 miles.
Most likely I'll make the next change to the taller Racor R690
2 micron filter which should last 15,000 miles as a Pre-filter.Edited by: 56Nomad
 

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56Nomad,

"What also strikes me is the amount of crap
that made it thru the OEM and was caught
by the Post OEM YIKES! "

I guess you figure who cares what goes through th eOEM since it's already prefiltered? There seems to be some concern over the overall integrity of the OEM in general. So far I don't want it to be the last filter before the system.
 

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Discussion Starter #11
Hoot,

I was in your camp..... until all the more recent data
has come in. I really believe that the under the hood
Post-OEM sheds more particles back into the fuel
than the frame mounted Pre-OEM set up.

For me, the panic with the claim that the OEM is a rust
bucket and dumping rust into the injectors is not a
significant problem enough to worry about.

I've seen no rust in any of the 3 OEM filters I've cut
open....... nor have I seen any water in any of my
filter drains or bowls. Maybe California has figger'ed
a way to remove water from their diesel fuel?

Hoot, if you or anyone else with a Post_OEM Racor filter
can come up with the same fuel test results as Alan, I will
move that puppy back under my air box again. I promise.
 

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56Nomad, you are crawling a long way out on the limb. I think I just heard a chain saw start up.
Later! Frank
 

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Discussion Starter #13
I think I just heard a chain saw start up. Later! Frank

Let the fuel filter wars begin again!

Actually, we have learned so much much since this topic
was introduced by George Morrison.
 

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Is there any companies offering a better filter in place of the OEM filter? What are the alternatives? I am likely going to put in a pre-OEM setup but was wondering if the filter head could be changed out on the OEM to accept a better filter or maybe there is a filter that could fit the OEM one. I could get a new head machined up that would fit the OEM place with a aftermarket filter.





Just a few thoughts...
 

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56Nomad,


As I have cautioned people, do not interpret the fuel analysis results as absolute. There are way to many variables present to do so. From a filtration point of view, the Post-OEM position for the finer R60S supplemental fuel filter is the correct location. I have my supplemental fuel filter located in the Pre-OEM position for other reasons (mainly warranty concerns).


Your R60S filter shown above looks to have a lot of life left to it.





AlanEdited by: OC_DMAX
 

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Coghlin said:
Is there any companies offering a better filter in place of the OEM filter? What are the alternatives? I am likely going to put in a pre-OEM setup but was wondering if the filter head could be changed out on the OEM to accept a better filter or maybe there is a filter that could fit the OEM one. I could get a new head machined up that would fit the OEM place with a aftermarket filter.





Just a few thoughts...
Coghlin,

Yes that is the biggy. Nobody wants to play with the OEM due to warranty issues. I think that's also why no companies offer a replacement assy.

We are all dancing around the piece of crap filter GM gave us to save warranty..... how ironic.
 

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Yeah, good point hoot. We do have that 100,000 mile warranty. Thing is, I expect my truck to go a lot further than that and it would help to have better filtration now. Anyone had warranty issues by having a second filter installed in the loop?
 

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56 Nomad,


By stratification, do you mean the diagonal lines going up the filter? I thought we would see horizontal dark, then horizontal light, then horizontal dark,etc. What do you think causes the fuel to stratify diagonally? Thanks


zipEdited by: Zip from Tenn
 

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Nomad,


Can you shed any more light on you shed any more light on:


56nomad said: "Also, keep in mind that Racor will soon be coming out with an aftermarket frame mounted filter pre-OEM for our trucks. Have they been reading between the lines on our filter experiments and figgered out the best option? Looks like I will not need a lift pump after all.
"





Thanks,


Bob
 
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