[C320-list] exhaust elbow question--racor filters

[Jeffrey Hare]

Steve,

   Not to start an arugment here, but that logic doesn't really hold for the
filter configuration we have on the C320 (yanmars anyway).  If we had a pair
of racor filters that were the same or similar size, then that would make a
lot of  sense because you could keep fuel flowing longer.  

But we have one quite large primary, and a itsy-bitsy secondary.  

If your fuel is so dirty that it is going to start clogging the relatively
large surface area Racor, then, by definition,  the small surface area of
the secondary will is likely going to clog first anyway with all the fine
particles that slipped through.

I've heard Yanmar recommending using 2 micron filters across the board on 3
different occasions now, most recently at the regatta.   

One factory tech said that the engine mounted filter was essentially there
to catch debris entering the system as a result of upstream filter changes
and that we shouldn't consider our system as a dual filter system.

-J


-----Original Message-----
From: Steve Magennis [mailto:magenns at yahoo.com] 
Sent: Monday, October 09, 2006 10:08 AM
To: vergaar2004-catalina at yahoo.com; C320-List
Subject: Re: [C320-list] exhaust elbow question--racor filters

The correct (but useless)answer to your question is "No".  The way
filter manufacturers recommend usding this type of a filter is to have
a fairly large (10 or 30 micron filter as the primary filter, and the
finer filter (2 microns) as the secondary.  That way, the first filter
in line removes most of the crap and the second filter removes the wee
little stuff.

If you use a fine filter for both, the primary filter will get plugged
rapidly, and your pump won't be able to suck enough fuel through the
filter to run your boat.

Most filter pros recommend a large filter for teh primary, and a fine
filter for your secondary.  You actually need both, and neither is
better than the other WHEN USED IN THE PROPER ORDER.

Steve
Alchemist #909

--- Koen Bennebroek <vergaar2004-catalina at yahoo.com> wrote:

> It was me who asked about the difference. But I'm
> still not clear as to what the difference means? Does
> it mean that the 2 micron filter is a better one as it
> filters down to 2 micron particles? So the R24S should
> be the more expensive one?
> 
> Thanks, Koen
> 
> ----- Original Message ----
> From: jsever1 <jsever1 at cox.net>
> To: C320-List <c320-list at catalina320.com>
> Sent: Saturday, October 7, 2006 8:53:47 PM
> Subject: Re: [C320-list] exhaust elbow question--racor
> filters
> 
> 
> Someone asked a while back about the difference
> between the R24S and R24T. I 
> believe the former is 2 microns and the latter is 10
> microns. They also make 
> a 30 micron element.
> 
> Joe Sever
> Nanjo 148
> Norfolk, VA
> 
> 
> 


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