Dirty little secret about the HPCR --- MUST READ

[vagabond1]

.
http://dodgeram.org/tech/dsl/Facts/98ISBspecs.html

That begs the next question. Is anybody running the Mopar 2u filters experiencing injector woes? I see the AirDogs are 3u. Is anyone running an AirDog and experiencing injector woes. PLEASE NOTE WITH OR WITHOUT FUELING BOXES.

On Mopar2u filter and after 12K engine miles, I haven't noticed Injector woes. It had to be between zero degrees F to 32 degrees F to be noticed on a cold start without the block heater.

 

[Joseph Donnelly]

With my 97 all I had to do was use the newer part number filter since the 97 through 98. 5 filter housings were all the same with respect to the filter's dimensions.

 

[Ol'TrailDog]

On Mopar2u filter and after 12K engine miles, I haven't noticed Injector woes.

Yes, but I have 34K on Fleetguard stratopore and do not have any injector woes. And I'm sure it is the same for the vast majority of folks that are running Fleetguards 10u filters, otherwise there would be a major TSB out.



This is one of those questions that would require some detailed statistical analysis with a large sample size. Having said that, I'm not willing to be a guinea pig, so it will be 2u filters from here on even if it is the more expensive Mopars. I wonder if Tomeygun could pop over to the service department and find out if the Mopars are still 2u? Or perhaps an AirDog or FASS may be in the picture, but I sure would like to have a stock filter that would do the job, of course.

 

[Old Man]

Cross Reference

Using the OEM #4883963AB, fleetguard gives their part #, FS 19598. OEM manufactured for as Chrysler. Additional information, (from fleetguard web site) it also gives an OEM # 04883963AC, but no other # but FS19598. Did not observe the u rating for this filter. Maybe I over looked it. Will do some more searching. Nature is calling, I GOT TO GO... ... ... ... ..... NOW!!!!!!!!!!!!!!!!!!!

 

[Buddy's Ram]

Very interesting thread. I have 24K on my truck and have always used fleetguard filters from Geno's. No problems so far. However the station I fill up at here in Montgomery has aviation style 2 micron filters on their pumps. So my main concern is while traveling.



As a side question, how hot does the egt need to be to not cause carbon build up? Will driving on the road daily help stop this or reverse it? I love my diesel and want it last!

 

[Gary - K7GLD]

"As a side question, how hot does the egt need to be to not cause carbon build up? Will driving on the road daily help stop this or reverse it? I love my diesel and want it last!"



Dunno about that, but I *do know* my oil sure gets LOTS dirtier in a few short around-town miles than it does in MANY freeway miles...

 

[rashwor]

Interesting thread. I have been thinking about this. I suspect that filtration or lack there of, could be a major cause of the injector woes that some are reporting.



To me, the idea solution would be a 2 micron filter that fits the stock filter bowl. I highly doubt that the stock filter is 2 micron. I will be watching this thread with great interest to see what comes of it.

 

[Gary - K7GLD]

"To me, the idea solution would be a 2 micron filter that fits the stock filter bowl. I highly doubt that the stock filter is 2 micron. I will be watching this thread with great interest to see what comes of it. "



There's a physical limit as to fuel flow you can get thru a 2 micron filter of a size that will fit the stock housing, and fed with the stock lift pump. And that only gets worse as dirt accumulates in normal use.

 

[LightmanE300]

I don't believe the mopar filters are 2 micron unless they have recently changed. Also folks be careful when you read filter ratings - some are 'absolute' and some are 'nominal' . The manufacturer may call it a 2 micron filter, but it may only be 60% efficient at 2 microns, and 99% efficient at 30 microns... which wouldn't be good.



The issue with dirty fuel is nothing new, and exactly why I plumbed a racor 2 micron absolute filter between my aux and main tanks. I run all the fuel thru the aux tank first, so before it even hits my truck's main tank, it's gone thru the 2 micron filter. Makes me feel all warm and fuzzy knowing I've got 50 cetane fuel that's double filtered

 

[rashwor]

There's a physical limit as to fuel flow you can get thru a 2 micron filter of a size that will fit the stock housing, and fed with the stock lift pump. And that only gets worse as dirt accumulates in normal use.

Correct; understood. The question is what is that limit? Is the limit high enough to still supply ample fuel to our engines? I would doubt it, but there is only one way to know for sure... unfortunately, I don't have the time to put into the research and testing.

 

[Vaughn MacKenzie]

There's a physical limit as to fuel flow you can get thru a 2 micron filter of a size that will fit the stock housing, and fed with the stock lift pump. And that only gets worse as dirt accumulates in normal use.

Good point Gary. What we need to realize is diesel is viscous and if the media filters to such a small micron level it will be difficult for fuel to pass through it especially when it starts getting cold. And such fine media will clog up faster too. Thus the reasons like you infer the canister would have to be bigger than stock for sure.



Vaughn

 

[Wayne M.]

Hey Ryan, That's the filter used on our new EGR Mack's we are getting in- without any other filtration, not even a racor!

Previously they had a conventional 2 spin-on (pri/sec) setup with a racor seperator. Now it's just the filter you have there. In my experience, fuel quality with my fleet is pretty bad and our problem is water. We go through a lot of VP44's and Mack Etech unit pumps and nozzles among other systems, and water is the main culprit. BTW, the older Macks used a pilot injection event, but not EGR. Does anyone know the size of a molecule of water? I think that is enemy #1 above dirt. At these pressures, water cuts metal pretty easily.

 

[SGolden]

The size of a single water molecule is ~3 angstroms. An angstrom is 10^-10meters. To put that in perspective a micron is 10^-6meters. So you are talking about a water molecule being 4 orders of magnitude smaller or 10,000 times smaller than the particles that are being talked about. Sorry for the science lesson. I could be off its been a few years since I had an actual chemistry class.

 

[Vaughn MacKenzie]

Chemistry class, that's one I prefer to not remember! Especially when it came time to calculate electron spin angles, energy, frequency, and a lot of other things I can't remember :{

 

[Wayne M.]

We never had a lab failure analysis done, except for our own informal exploration of taking apart a failed Mack (bosch) unit pump. We saw lots of abrasions and the like on all the "rack" and hi pressure parts. We all thought that was the effects of water droplets since the metal had a eroded appearance. Maybe it was foreign debris. Fuel purity is real paramount here!

 

[Vaughn MacKenzie]

And lubricity I'm sure too, Wayne!