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Old 06-06-2018, 03:31 PM   #1
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Micron size filters

Could I use a 30 Micron Racor filter or should I use a 10. Naturally aspirated 100 HP diesel??
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Old 06-06-2018, 03:33 PM   #2
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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?
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Old 06-06-2018, 03:41 PM   #3
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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.
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Old 06-06-2018, 03:52 PM   #4
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The Primary. The Secondary is a NAPA 10 Micron.
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Old 06-06-2018, 04:33 PM   #5
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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.
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Old 06-06-2018, 05:22 PM   #6
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Whatever the engine manufacturer specifies.
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Old 06-06-2018, 08:37 PM   #7
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I run 10 micron primaries since the secondaries are a pain to change and bleed.
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Old 07-01-2018, 10:46 PM   #8
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Quote:
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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.
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Old 07-02-2018, 01:49 AM   #9
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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.

Good Luck.

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Old 07-10-2018, 08:20 AM   #10
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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
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Old 07-10-2018, 10:14 AM   #11
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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!
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Old 07-10-2018, 10:21 AM   #12
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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.
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Old 07-10-2018, 12:04 PM   #13
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Quote:
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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...
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Old 07-10-2018, 12:11 PM   #14
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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.
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Old 07-12-2018, 05:43 AM   #15
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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.
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