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Old 06-12-2010, 01:56 AM
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Default One More Fuel Filter Question: 2 Micron vs 10 Micron

I found a filter that look almost like the one on my Yamaha 115 four stroke set-up - I have a Honda Marine / Racor filter (10 micron) -- I see there are filters that look almost exactly the same that are 2 micron filters -- e.g. Parker/Racor 2 Micron filter Suction Side Applications --- etc.


Is it better to use a 2 micron filter than a 10 micron filter? The price difference is actually nothing -- things being equal isn't a smaller micron filter better? Seems like the smaller "holes" would filter the fuel better and give purer fuel to the engines? Right?

Can some Yamaha dealer give us advice on this?
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Old 06-12-2010, 05:06 AM
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I don't have an outboard, but on my 454 inboards, the carbs can pass the less than 10 micron stuff, so I use 10 micron filters rather than have the filters clog up sooner than necessary.
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Old 06-12-2010, 06:29 AM
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Originally Posted by C Craft 23 View Post
I found a filter that look almost like the one on my Yamaha 115 four stroke set-up - I have a Honda Marine / Racor filter (10 micron) -- I see there are filters that look almost exactly the same that are 2 micron filters -- e.g. Parker/Racor 2 Micron filter Suction Side Applications --- etc.


Is it better to use a 2 micron filter than a 10 micron filter? The price difference is actually nothing -- things being equal isn't a smaller micron filter better? Seems like the smaller "holes" would filter the fuel better and give purer fuel to the engines? Right?

Can some Yamaha dealer give us advice on this?
A Yamaha dealer would typically follow the party line "Use the Yamaha ten micron filter". What else would they say? They have a vested interest in promoting the Yamaha ten micron since that is what they sell. Yamaha has not yet offered a two micron filter.

A two micron filter obviously filters out smaller particulates but there is a downside to it. The filter may (repeat may) have a greater restriction to fuel flow when new than say a ten micron filter. In the case of the Racor I believe they are the same flow rating.

If the fuel is contaminated then the two micron will clog up more quickly as it captures the smaller particles that would flow through the ten micron. But, isn't that what we want? To catch whatever we can before it gets to the motor?

The only way you will know if it has any adverse effects is for you to use it. Maybe you will need to change filter elements more often, maybe not. It is a function of the cleanliness of the fuel.
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Old 06-12-2010, 11:01 AM
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In a filtration system in general....you should use different sized filters in line with each other....the bigger micron first that will catch the larger particles and the smaller micron catches whats left.....if you simply use the smaller micron, it will clog more quickly.
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Old 06-12-2010, 11:07 AM
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More important for diesels where a 10 micron particle will damage high pressure injectors
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Old 06-12-2010, 11:52 AM
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There is a series of threads in the SIM area (Shipyard Island Marina) of the THT forum on folks considering and/or using 2 micron filters and way. May want to check it out as well.

My 2001 bay boat did not have any pre-engine filter and the prior owner never bothered to add one. I'm in the process of adding a Racor with clear bowl and going with 2 micron. I'm also adding a vacuum gauge on the engine side of the Racor so I can tell when the filter is clogging and needs changing (my engine would be due for change at 4" mercury vacuum). Will also add in a vacuum switch to an audio alarm at the console and set the trip point to 5" mercury vacuum as a fail safe measure. Gauge does have a drag pointer so I will just check it after an outing and should get the most life possible out of a filter by only changing it when needed instead of every "X" hours.

Main logic for me in going with 2 micron instead of 10 is the smallest internal filter on my HPDI is 10 micron. There are quite a few posts about the white powder stuff from ethonol fuel getting past the filters and eventually clogging the VST filter and the injector pump screens in a HPDI. The on engine filters get pricey and are a pain in the butt to change. I can easily get to and change out a $20 racor prefilter and never have to worry about any particle clogging my on engine filters. Anything that can get past a 2 micron "should" go through the entire fuel system with no problems. In theory those filters should pretty much last forever if the pre-engine filter is small enough.

A plus is, if I can still use the standard 10 micron racor's if I decide to or can't find a 2 micron for some reason (in a pinch).

I'm going to install the racor, flush out the tank and reserve and then change out the fuel lines and all the on engine filters (due for change anyway). That way I have a good clean baseline to start with and hopefully will only have to change the racor from here on out.
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Old 06-12-2010, 01:16 PM
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2 microns is .000078" while 10 microns is ,00039". I would be afraid that a 2 micron filter would go on bypass too quickly. I would also be worried about filtering out fuel additives and maybe even 2 stroke oil.

I suggest you go with a 10 micron filter and change it every 50 hours.
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Old 06-12-2010, 07:15 PM
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I'm also adding a vacuum gauge on the engine side
Can you link this item. Like to consider it too.
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Old 06-12-2010, 07:31 PM
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Originally Posted by Bamaskeetshooter View Post
2 microns is .000078" while 10 microns is ,00039". I would be afraid that a 2 micron filter would go on bypass too quickly. I would also be worried about filtering out fuel additives and maybe even 2 stroke oil.

I suggest you go with a 10 micron filter and change it every 50 hours.
This is silly. 2 stroke oil and fuel additives are liquids. The Racor filters out solid particles...

I just switched to a 2 micron filter today. Hoping to keep my VST filter cleaner after ongoing troubles. I have had to change it 3 times in the last 70 hours.
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Old 06-12-2010, 07:57 PM
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I would be carefull with the 2 micron filter. You might not get the flow needed to feed a big outboard. A lean running outboard will be damaged very quickly, especially a 2 stroke. Of course that is no worse than a 10 micron clogged with crap.
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Old 06-12-2010, 07:59 PM
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This is silly. 2 stroke oil and fuel additives are liquids. The Racor filters out solid particles...

I just switched to a 2 micron filter today. Hoping to keep my VST filter cleaner after ongoing troubles. I have had to change it 3 times in the last 70 hours.
No it's not.. A liquid has size too and you can absolutely cause restriction. Run oil through your racor and see how good it goes through. However since most engines aren't premix that doesn't matter here.
Smaller filter = more restriction in most cases as mentioned above.
A 10 Micron becomes a 2 micron as it clogs. You can make it a 2 micron by not changing it often.

Here's a link to the RACOR fuel vacuum set. You can screw it to the spare motor side port. I bought one for $90 and can't find the danged thing.
http://www.maesco.com/products/racor...vac_gauge.html

Particles you see in a VST aren't under 10 micron unless they clumped. They were formed after the 10 micron. You can't see smaller than 40 microns on a good day.

High pressure injection whether it be HPDI, Opti, Etec or diesel all don't like particles. I'd be much more worried in these than a 4 stroke. Those pumps are $$$$$
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Old 06-12-2010, 08:21 PM
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Particles you see in a VST aren't under 10 micron unless they clumped. They were formed after the 10 micron. You can't see smaller than 40 microns on a good day.
It is clogging with the dreaded white (actually grey) powder. Very clumped. Zillions of tiny particles clumped together and completely clogging the VST filter.
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Old 06-12-2010, 09:00 PM
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Can you link this item. Like to consider it too.
Change filter (doesn't matter if it's a 10 micron or 2 micron) when the vacuum reaches 4" mercury for a 200 2.6liter HPDI and smaller and 6" mercury for larger HPDI's. Contact your engine maker for values if you have something different. I wish the range on the gauge was 10" max, but this is the only model with a drag pointer I could find. The original thread is here. :

THT thread on 2 micron Racor in SIM area of board

But this is the gist of it and links to the gauge and vacuum switch I'm using

Quote:
Keep it simple of course. I found a mechanical vacuum gauge with a peak reading pointer that will work for $69. I wish the vacuum range was more like what we are looking at (4-6" mercury depending on your motor), but this one is 30". The high reading "drag pointer" will just let me plumb this in at the filter on the extra port and check the maximum reading whenever I want to. Don't have to try and run the boat at WOT and look into the rear compartment at the same time, and can even check with the motor off. I'll just make a quick glance a part of the launch and re-load proceedure which is when I should be checking the water trap on the filter anyway.

Here is the gauge I'm pretty sure I'm going to use. And it's only $69. If anyone knows of a model that reads 10" of mercury or say in the 60" of water range that has the follower pointer please let me know (There is a nice Ashcroft that reads 60" of water but I can't find a follower pointer option for it). The "red" zone on this one starts at 10" of mercury so it's really for a deisel filter but should work fine.

Now I just need time to get the install done after the "plan B" gauge gets here.

30" mercury mechanical - fluid dampened vacuum gauge for fuel filter



They also have a vacuum switch that may be a good supplement to the gauge. It has an adjustible range of from 5" to 15" mercury, so you could set it for a "urgert" check filter warning if it was plumbed into a T fitting with the gauge. This would let you know of a sudden clogging of the filter while underway. For $49 bucks it might be cheap insurance. It's basically a SPDT switch activated at the set vacuum point and can trigger whatever type of alarm, light, etc... you wired it to.

Vacuum alarm switch

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Old 06-13-2010, 10:25 AM
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I would be carefull with the 2 micron filter. You might not get the flow needed to feed a big outboard. A lean running outboard will be damaged very quickly, especially a 2 stroke. Of course that is no worse than a 10 micron clogged with crap.
a 2 micron racor has no issue flowing WAY WAY WAY more diesel (more viscous) than even a 350 could consume of gas (way less viscous).
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Old 06-13-2010, 10:26 AM
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2 microns is .000078" while 10 microns is ,00039". I would be afraid that a 2 micron filter would go on bypass too quickly. I would also be worried about filtering out fuel additives and maybe even 2 stroke oil.

I suggest you go with a 10 micron filter and change it every 50 hours.
RACOR's do not bypass. When they are clogged, you get a fuel pressure alarm and then an engine shutdown. There is no bypass on them. You're thinking of an oil filter
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