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-   -   Micron size filters (http://www.trawlerforum.com/forums/s38/micron-size-filters-38843.html)

CaptFun 06-06-2018 03:31 PM

Micron size filters
 
Could I use a 30 Micron Racor filter or should I use a 10. Naturally aspirated 100 HP diesel??

dhays 06-06-2018 03:33 PM

Quote:

Originally Posted by CaptFun (Post 669829)
Could I use a 30 Micron Racor filter or should I use a 10. Naturally aspirated 100 HP diesel??


Primary or Secondary? What does your engine manual say?

Ski in NC 06-06-2018 03:41 PM

What engine?

In general, either would be ok. I use 10 unless it clogs too quickly, then may use a 30. The secondary is what defines the cleanliness at the injection system.

Some engines do spec a 30 as a primary.

CaptFun 06-06-2018 03:52 PM

The Primary. The Secondary is a NAPA 10 Micron.

Lepke 06-06-2018 04:33 PM

The usual configuration for boat sized diesels is 30 micron primary and 10 micron secondary. Those sizes keep particles out of the fuel that cause major damage to fuel system components.
But there are advantages to running really clean fuel - longer injector and pump life. I run a 2 micron primary and the filter lasts about 500 hours. But my tanks are clean and I buy clean fuel from dealers that maintain their tanks and filters. Not just any marina.

caltexflanc 06-06-2018 05:22 PM

Whatever the engine manufacturer specifies.

Comodave 06-06-2018 08:37 PM

I run 10 micron primaries since the secondaries are a pain to change and bleed.

kapnd 07-01-2018 10:46 PM

Quote:

Originally Posted by CaptFun (Post 669829)
Could I use a 30 Micron Racor filter or should I use a 10. Naturally aspirated 100 HP diesel??

Ideally, both.
Two stage primary filtration starting with a 30 mic, then a 10mic, followed by a 2 mic secondary.
Read all about it at sbmar.com, they will not lead you wrong.

alfamike 07-02-2018 01:49 AM

Fuel Filter - Micron sizing Question
 
You need to give us a little more information, different mfgrs. have different recommendations, So what Make, Model, age & type of engine ?
Does engine have filters on it & what are they & do you want to have to change your on engine filters regularly, or would you rather change your before engine RACOR's or what ever you have more often.

Different Diesel Engine Makers have different injector systems, also year of manufacturer means different specs.

KAPND is absolutely correct about the recommended way to do it.

But then the question is - do you have even dual series fuel filters ?

I like to run a smaller filter than 10 microns in my RACORS to save how often I must change the factory fuel filters on the engine.

So I run 2 micron filters & that has worked for me for 4 decades.

30 micron first then a 10 (or 2 micron in my case) next, then your factory on engine filters as back up as no filter stops 100% of everything, 100% of the time.

Better safe than sorry I say. :hide:

Good Luck.

Alfa Mike :thumb:

CaptFun6068 07-10-2018 08:20 AM

Thank you one and all. I removed my primary filter out of the hell hole. I mounted a water seperator follow by 2 racors (10 micron) in series. I attached the 3 units to starboard and hung it from a pilot house floor stringer. I now remove the stairs and there it is, life is good

Marlinmike 07-10-2018 10:14 AM

You really should do step filtration, as someone else posted Tony Athen's website which he talks a lot about that, also understand ultra fine can put an extra load on fuel pump. As many have stated you should follow the manufacturers recommendations.
Human nature is if 10 micron is good 2 micron is even better, and that's not always the case.... Good luck!

psneeld 07-10-2018 10:21 AM

While step filtration is fine and really the preferred method, many of us running 2 gal per hr diesels have run 2 micron primary and secondary filters for decades with great results.

With a vacuum gauge, you can tell if there is a strain on the fuel pump.... and go from there.

Heron 07-10-2018 12:04 PM

Quote:

Originally Posted by kapnd (Post 677822)
Ideally, both.
Two stage primary filtration starting with a 30 mic, then a 10mic, followed by a 2 mic secondary.
Read all about it at sbmar.com, they will not lead you wrong.

Exactly how my boat is set up...

Baker 07-10-2018 12:11 PM

I run 10 micron Primary Racor 900s with Cummins spec on engine secondaries....no clue what micron(2 I think) but it is what is specced for the engine.

FF 07-12-2018 05:43 AM

Remember the rating on the filter is nominal, not absolute , so those 2 filters will still pass 30 chunks at times.


That is why multiple filters in a row work so swell , and are mostly needed on modern electric injection systems.

VJameslanza 01-26-2019 05:04 PM

10 micron Racor as Primary
 
1 Attachment(s)
We have been using a 10 micron primary (Racor 500FG) for the last 22 months (Since we bought Encore), and in the last year, I've had to drain about 1/2" of 'junk' from the filters every few months.

This last week, a trip to Captiva was taken in less than ideal conditions, and we hobby horsed for 3 hours steady. During a routine Engine Room check while underway, I found about 1" of 'junk' at the bottom of one of the Racors (the other was negligible). My manifold allows me to isolate one filter (I use both all the time), which I did, and drained the 'junk'. I filled the filter with fresh diesel, and upon bringing back online, about 1/2 of 'junk' filled the bottom of the clear bowl. During the entire trip home, the engines ran flawlessly at 1700-1800 rpms, but during the 5 hour trip the filter gained almost 1" of (you guessed it) 'junk'. At home, I tested it for water, Negative. I drained the bowl into a clear container and let it settle. Attached is the result.

Alge? Bacteria? Have birds been crapping in my fuel tank?
I replaced the Racor filters with new 10 micron (the old ones had no evidence of green anything in them), but I thought what the heck...Your thoughts?

Delfin 01-26-2019 05:20 PM

Quote:

Originally Posted by VJameslanza (Post 735028)
We have been using a 10 micron primary (Racor 500FG) for the last 22 months (Since we bought Encore), and in the last year, I've had to drain about 1/2" of 'junk' from the filters every few months.

This last week, a trip to Captiva was taken in less than ideal conditions, and we hobby horsed for 3 hours steady. During a routine Engine Room check while underway, I found about 1" of 'junk' at the bottom of one of the Racors (the other was negligible). My manifold allows me to isolate one filter (I use both all the time), which I did, and drained the 'junk'. I filled the filter with fresh diesel, and upon bringing back online, about 1/2 of 'junk' filled the bottom of the clear bowl. During the entire trip home, the engines ran flawlessly at 1700-1800 rpms, but during the 5 hour trip the filter gained almost 1" of (you guessed it) 'junk'. At home, I tested it for water, Negative. I drained the bowl into a clear container and let it settle. Attached is the result.

Alge? Bacteria? Have birds been crapping in my fuel tank?
I replaced the Racor filters with new 10 micron (the old ones had no evidence of green anything in them), but I thought what the heck...Your thoughts?

That's some nasty looking fuel. From the photo it looks like water, which suggests you have a way for water to get into the tank.

VJameslanza 01-26-2019 05:29 PM

Tested with Gasoila Water Finding Paste, and the results were negative.

kchace 01-26-2019 05:33 PM

If that was coming out of my fuel tanks I'd be pretty concerned. That is not at all normal. I would suggest getting the tanks cleaned.

Ken

Delfin 01-26-2019 05:43 PM

Quote:

Originally Posted by VJameslanza (Post 735034)
Tested with Gasoila Water Finding Paste, and the results were negative.

Be that as it may, it is a clear liquid, denser than water. Kind of narrows down the possibilities to water, glycerin and sulphuric acid.


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