John,
I am not sure you are right. To get good filtration you need to
drop the velocity so proper separation occurs. This is the purpose of the
orifice so only a certain volume of oil can enter and pass at any given time
period. This is why by-pass filters work and Factory Full Flow Filters dont.
Full Flows are only a protective screening device designed to filter out the
large particles (generally over 30 micron) and chunks. [Planned obsolescence
planned on a big scale].While the filter might say on it 10 micron this is a
nominal rating only and is any figure the manufacturer wants to pull out of
the air. Generally grossly overstated. Absolute rating is the only one that
counts. Difference is while a nominally rated filter will pull the odd
particle out down to that size most of them only really start at much higher
levels no matter what the manufacturer claims (generally round the 25 to 30
micron level). An absolute rating means the filter removes particles down
to that rating and theoretically all above. Even then that rating still has
to be taken with a grain of salt. Results are often not repeatable. Under
this system they can test a piece of filter cloth rather than a complete
filter.The oil industry, the auto industy, engine manufacturers, and filter
manufacturers have got away with this for a hundred years (the old story
"Keep them in the dark and baffle them with bullshit)". Only now with the
introduction of beta ratio testing are they slowly being forced to do tests
that are reliable and repeatable. Even then expect this to take at least 10
years before these are phased in fully.
If you want to filter finished biodiesel then a fuel filter is acceptable
but if you want to filter wvo then you will need an oil filter. Suggest a s
s screen irrigation filter before this such as an Amiad.Oil filters can be
converted to fuel filters by drilling the orifice out and opening it up but
not the other way round.
Note that by-pass filters generally use depth filtration as opposed to
surface filtration and which is universally recognized as being vastly
superior. (something like 130 times the surface depth ie.4" or 100mm +
compared to 1/32" or 0.8mm).
Trouble with T.P is that it can be impacted by too much pressure. Good
by-pass filters contain the roll in a can which holds the roll in place, is
easy to remove and extract the roll. Idea is to keep the pressure down which
can easily be achieved by the use of a needle valve. Idea is to set it and
then not let anyone tamper with it. Flowrate will drop a little as its get
towards the end of its operational life so set it initially and then dont
touch or tamper with it. Was suprised the other day when I was talking to
the technical manager for Cummins when he asked me why I want to utilize and
push an old technology. Point is the concept has not been surpassed and/or
superceded. May have been now equalled but at what cost. Do you want to use
a spin on filter at $50 plus minimum when you can use a filter that cost
less than 1/25th the price. Trouble is nobody is making any money out of
this except the paper company so Joe Public gets shafted again. While I
would not knock Cummins as they make great motors I would point out they
own Fleetguard Filters so expect lots of hype about their new marvellous
filters that they have just developed over the next few years (.........hell
I think I have heard this all before.) ............
By the way 60 % of the wear and tear in a motor is caused by particles
between 5 and 15 micron in size with 75 to 80 % caused by particles between
1 and 20 micron. Does it suprise me that at least 95% or more of all Full
Flow Filters only remove particles above 20-25 micron and the public knows
diddly quat about by-pass filters. Now dont blame your mechanic, your used
car salesman, or whoever either. HELL MAN he's got to eat as well.
Just as an afterthought: Studies by Cummins Technical Centre (part of
Cummins Engine Coy the largest truck engine manufacturer in the world showed
that wear can be reduced by up to 91% as a result of using a by-pass filter
in combination with the full flow filter. The same studies also showed that
the older an engine gets the more carbon must be removed and that this is
when the engine needs the added protection the most. (quote: Cummins: quote:
David). How come the world dosnt know this? HELL MAN is it my fault that I
believe in capitalism first and democracy second?
By the way a single filter does not want to pass more than 2 litres or 1/2
gal per minute if it is going to do its job properly. If you are wanting to
pass more than that use 2 singles, a double or a treble. Also note that a
double dosnt pass twice as much and a treble three times as much due to that
orifice restriction.
B.r., David
-----Original Message-----
From: John Harris <[EMAIL PROTECTED]>
To: biofuel@yahoogroups.com <biofuel@yahoogroups.com>
Date: Tuesday, March 06, 2001 6:15 PM
Subject: Re: [biofuel] Frantz..Orifice
>If you get a Full flow franz (ex diesel truck fuel filter) this will have a
>large orifice (up to 1/4)
>and will run at low pressure and good flow rate.
>If you've got one from an oil bypass filter it will have a tiny orifice and
>will take a fair pressure to get a good flow rate - this wont change the
>pressure across the filter - just in the pipe. the answer if you are going
>to use it only for your bio factory is to get into it with a drill and take
>the restriction out to as large as possible.
>While you are having a look at it, look also for a bypass valve past the TP
>element, some of these are around and will start bypassing before the
filter
>is really blocked
>(I think a couple of engine manufactures threatened to void warranties if
>the bypass was completely blocked so franz complied)
>for our use this bypass should be blocked off so we don't get any
bypassing.
>In mine it just meant pulling the spring out and tapping a stud in against
>the valve - quite painless.
>Regards
>John
>
>
>Biofuel at Journey to Forever:
>http://journeytoforever.org/biofuel.html
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