T&T: Racors 2 micron vs 10 micron AKA belts and suspenders

[GARY RITZMAN]

1) This is the message I put to our group:
----- Original Message -----
From: GARY RITZMAN<mailto:ritzmans@msn.com>
To: Trawlers-samurai<mailto:trawlers-and-trawlering@lists.samurai.com>
Cc: Trainman484848@aol.com<mailto:Trainman484848@aol.com>
Sent: Friday, June 30, 2006 5:19 PM
Subject: Racors 2 micron vs 10 micron


SNIP: If your going to tell me
I'm wrong then back it up with rational thought and logic and maybe I will
learn
 something. Brian Palmetto FL

Brian and many others: Good point. So how do we know the micron level of CAV
secondary filters on a Lehman 135SP? I have seen a lot of inference that it
might be 2 micron but how do we know that? If it is not 2 micron then the
engine does not require 2 micron anywhere?
<<<Gary Ritzman>>>  M/V Dharma   Albin 40  Mercer Island WA

2) The only answer I have seen is from Philip Odom:

Date: Sun, 2 Jul 2006 08:26:56 -0400
From: "Philip Odom"
<philodom@gmail.com<http://by106fd.bay106.hotmail.msn.com/cgi-bin/compose?cur
mbox=00000000-0000-0000-0000-000000000001&a=b6132ddb2f34fb28c989ffb063f51c1b0
dc3ffbb624231d46043ba0b58e1c4d1&mailto=1&to=philodom@gmail.com&msg=07D6CB04-6
7DE-4ECF-B234-FE32E78E6009&start=0&len=50128&src=&type=x>>
Subject: T&T:  Racors 2 micron vs 10 micron (who knows?)
I think I posted this years ago when this type of subject came up. I
questioned the micron rating of the CAV filters that most of us use and Wix
says their filter is 10 micron (part # 33166) and Lucas/Delphi claims theirs
(part # 7111-296) is 5-7 micron. Wix techs dispute Lucas... Probably Racor
would have their own spin on the subject..
Below are the emails I received FYI.
Good luck,
Phil

(Contact From WIXFILTERS)
>Our 33166 part number is a direct cross reference to the Lucas 7111-296
> part number.  This is the same part number used by C.A.V. who invented
this
> type of filter.  Their filter contains media that is rated at 10 micron
> like ours.  It does not have 2 micron media.  A particle that is 1
> micrometer (micron) in diameter is .000039" across.  The average human
hair
> has a diameter of 70 microns and the human eye can not see anything under
> 40 microns without magnification.  The difference between 2 and 10 microns
> is measurable in the lab but is real life it makes very little, if any.
> performance difference.
>
> Thank you for your inquiry.
>
> Chris Greeson
> Technical Service Representative

(Contact from Lucas/Delphi)
> The Delphi HDF296 has a micron rating of between 5-7 micron (average
> contaminant size in testing is 6.9 micron).  Its average retention is not
> less than 85% and is normally around 95%.  The rolled paper-type design of

> the filter was pioneered by Delphi, and it still remains the benchmark for
> this kind of filter.
>
> I hope that this answers your question, and if you have any further
queries,
> please do not hesitate to contact me.
>
> Kind regards
>
> Ian Girle
> Product Manager
> Filtration

3) If CAV secondaries are 10 micron then I have to suspect that the good
people arguing in favor of 2 micron primaries must wear belts and
suspenders-perhaps two of each?

<<<Gary Ritzman>>> M/V Dharma  Albin 40  Mercer Island WA
PS Happy Canada Day and Happy Fourth of July