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Old 02-24-2020, 02:59 PM   #1
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Primary Fuel Filters

Hello everyone and thanks for the thesaurus of information you share.
I'm replacing the old DAHL 201 filters with new RACOR turbine filters.
Motors: DD 671Natural - 310HP each.
Question:
I can't find the Dahl 201 specs.
Do I want Racor 1000MA (180Gph), 900MA (90Gph) OR 500MA (60Gph)?
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Old 02-24-2020, 03:03 PM   #2
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Not sure exactly how much the DDs pump per hour but it is a lot. I had 6V53s (216 hp) in a previous boat and had the 1000 Racors in it. Keep in mind that DDs pump way more gph than they burn.
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Old 02-24-2020, 09:10 PM   #3
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My last boat had 671ís with Racor 1000ís. I donít believe the 900 series are sufficient.
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Old 02-24-2020, 09:30 PM   #4
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Quote:
Originally Posted by m/v ATHENA View Post
Hello everyone and thanks for the thesaurus of information you share.
I'm replacing the old DAHL 201 filters with new RACOR turbine filters.
Motors: DD 671Natural - 310HP each.
Question:
I can't find the Dahl 201 specs.
Do I want Racor 1000MA (180Gph), 900MA (90Gph) OR 500MA (60Gph)?
What you need are your engine's fuel flow specs. Volume at RPM. Not fuel burned but fuel burned plus return. This will tell you which Racors to use. I suspect contacting Racor will be a good way to go if you can't find the engine specs.

With old skool engines I like the dual system. The setup with the 1,2,both,off valve. I run on a single element and if I am caught by surprise with a fuel problem RPMs will drop. If I react to the problem quickly enough I can pull it back to idle and switch to the other never missing a beat. Then as soon as I can I change the plugged filter. All of this can be done without ever having to shut down. I keep a jug of clean fuel handy in case I have to top up the housing before putting the lid back on. No need to fill it to the brim, Racors are designed to deal with a bit of air at the top. And generally the older engines can swallow a bit of air and keep on running.
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Old 02-24-2020, 10:11 PM   #5
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Each engine should pump about 35 gph depending on plumbing bends, restrictions, etc. I use 900s on my DDs. I have 2 Racors with 1 online and 1 ready to go. Generators also go thru the Racor. And each engine has it's own secondary filter.
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Old 02-24-2020, 10:14 PM   #6
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Keep in mind that DDs pump way more gph than they burn.
In fact some say it's a fuel polishing machine with a prop attached.
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Old 02-25-2020, 05:25 AM   #7
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Thank you all for the replies. I just read an article on the subject by Steve D'Antonio who's opinion is "the bigger the filter, the better". So, Racor 1000MA it is. Thanks again!
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Old 02-25-2020, 05:44 AM   #8
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Agree that bigger is better. The filter element on the 900 is only slightly bigger than the 500. The 1000 element is huge in comparison. But they are large format containers. Filter housing is 22-inches tall and requires 10-inches clearance above to swap elements. If I had space, I'd use for polishing.
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Old 02-25-2020, 08:05 AM   #9
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Athena
Suggest you read Tony Athens' articles on fuel filtration. Sure, big Racors work but spin on filters carefully arranged provide superior filtering with much easier changes. And a much smaller footprint.
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Old 02-25-2020, 08:27 AM   #10
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900's would be fine for 671N. Nothing wrong with going with the 1000 as it can hold like twice the dirt before needing a filter change.
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Old 02-25-2020, 09:09 AM   #11
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Athena
Suggest you read Tony Athens' articles on fuel filtration. Sure, big Racors work but spin on filters carefully arranged provide superior filtering with much easier changes. And a much smaller footprint.
absolutely +1 - and vacuum gauges eliminate surprises along the way.
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Old 02-25-2020, 09:47 AM   #12
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Not sure where I read it, and a quick web search came up empty, but I remember a caution about oversizing the Racor filter may reduce the turbine action which helps to remove the water from the fuel. The theory is that if the filter is designed for 180gph and you are pumping 30gph, you may have insufficient rotational velocity to get the centrifuge effect to cause the water to drop out into the bowl. The filter element is treated to block water, but may foul sooner because it is doing more of the water removal. Might be worth looking into further. Sorry to cloud the issue without links to support.
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Old 02-25-2020, 10:05 AM   #13
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If flow rate is too low to get good rotational speed in the bottom, then flow rate is also slow enough that simple gravity will separate out the water. I have used over sized Racors in many apps and have had no problem with them separating out water.
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Old 02-25-2020, 10:26 AM   #14
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Good point Ski.
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Old 02-27-2020, 06:07 AM   #15
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Before the Raycore the water was taken out with a very fine mesh cotton sock in a 1 quart glass jar.

Think lawnmower filter but in a GIANT size.

These worked well, and after emptying were as good as new, the usual on engine filter took care of any remaining particles.
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Old 02-27-2020, 07:31 AM   #16
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The turbine affect of Racors does not work on Lehmans and perhaps Perkins, not enough volume. A Lehman returns virtually no fuel and demands no more than 2.5 gallons per hour. My twins consume just 3.5 gallons per hour. In my opinion, a Tony Athens setup using sequential filtering with vacuum gauges is far superior for a Lehman, or any engine, for filter changes, even underway, quite simple. If one feels the need to check the bowls daily, just open a bottom drain and check. The clear bowl of a Racor is difficult to discern any crud or water anyway.

I do not have an Athens setup but if I were retrofitting, that is what I would install.
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Not sure where I read it, and a quick web search came up empty, but I remember a caution about oversizing the Racor filter may reduce the turbine action which helps to remove the water from the fuel. The theory is that if the filter is designed for 180gph and you are pumping 30gph, you may have insufficient rotational velocity to get the centrifuge effect to cause the water to drop out into the bowl. The filter element is treated to block water, but may foul sooner because it is doing more of the water removal. Might be worth looking into further. Sorry to cloud the issue without links to support.
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Old 02-27-2020, 07:42 AM   #17
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The turbine affect of Racors does not work on Lehmans and perhaps Perkins, not enough volume. A Lehman returns virtually no fuel and demands no more than 2.5 gallons per hour. My twins consume just 3.5 gallons per hour. In my opinion, a Tony Athens setup using sequential filtering with vacuum gauges is far superior for a Lehman, or any engine, for filter changes, even underway, quite simple. If one feels the need to check the bowls daily, just open a bottom drain and check. The clear bowl of a Racor is difficult to discern any crud or water anyway.

I do not have an Athens setup but if I were retrofitting, that is what I would install.
See Ski's post #13.
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Old 02-27-2020, 10:23 PM   #18
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Quote:
Originally Posted by catalinajack View Post
The turbine affect of Racors does not work on Lehmans and perhaps Perkins, not enough volume. A Lehman returns virtually no fuel and demands no more than 2.5 gallons per hour. My twins consume just 3.5 gallons per hour. In my opinion, a Tony Athens setup using sequential filtering with vacuum gauges is far superior for a Lehman, or any engine, for filter changes, even underway, quite simple. If one feels the need to check the bowls daily, just open a bottom drain and check. The clear bowl of a Racor is difficult to discern any crud or water anyway.

I do not have an Athens setup but if I were retrofitting, that is what I would install.
I didn't realise - that the Lehman's and Perkins don't have much return. I assumed the return for them was the same as others. Our Perkins M135 consumes 28L/hr at WOT 2600RPM (ignoring propping!), and I assumed that at 1500RPM or about 6L/hr, the return would be 10+ L/hr as I've heard number of 3-10x the consumption at lower RPMs.
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Old 02-28-2020, 07:36 AM   #19
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I didn't say that a Perkins engine returns a small amount, I said perhaps. I did say that a Lehman does not. Bob Smith from American Diesel used to do engine instruction classes. He would bring an operating Lehman on a pallet. He would not even bother to rig a collection device for the return line so little fuel would be returned. Does anyyone else know whether a Perkins also does not return much fuel? I suspect not but I do not know.
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I didn't realise - that the Lehman's and Perkins don't have much return. I assumed the return for them was the same as others. Our Perkins M135 consumes 28L/hr at WOT 2600RPM (ignoring propping!), and I assumed that at 1500RPM or about 6L/hr, the return would be 10+ L/hr as I've heard number of 3-10x the consumption at lower RPMs.
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Old 02-28-2020, 08:58 AM   #20
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I know my Lehman 120 doesn't return much.... I remember more than one 135 owner saying it returned a lot more... how much I have no idea but different than 120s (I also believe fuel pump differences were mentioned)...


Out of the TT archives....


"When I ask Bob about doing this he warned not to. He said that the reputation of minute fuel return was earned by the 120's, but that the newer generation engines like the 135's had a significantly larger fuel return than the 120's. I assume, and didn't ask, that it was because of the different type of injector pump. He told me that if I did the "T thing" on my 135's that it "might" induce too much air and / or turbulance in the incoming fuel and cause me problems."
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