Jerry Bransford

I haven't heard of any oil filter that doesn't have a check valve Frank.
Even the cheapest Fram filters have that.

Jerry

FrankW wrote:
> I heard somewhere that the better filters have a check valve
> to prevent the back flow of oil. This true?
> I always get the mopar filter, but which filters are
> considered better than OEM?
>
>
> Rich Hampel wrote:
>
>> No no no no no
>>
>> Its true that a resinated paper removes ~25 micrometer particles (at
>> about 98% efficiency) but such paper also has removal efficiency at the
>> submicronic range but to a few% removal capacity (called a 'beta curve'
>> in filter-geek speak). Since the oil RECIRCULATES constantly through
>> the filter media the reduction of particle size continues and will
>> 'level-out' at some predetermined level (probably at about 0.5-
>> 1,0µM). A filter also becomes more efficient at removal size as more
>> debris is
>> captured (clogging the 'holes' and leaving smaller flow paths).
>> In a perfect world one would have a differential pressure gage mounted
>> across the oil filter to indicate when to change - when the
>> differential pressure starts to quickly increase - indicating that the
>> volumetric flow is declining.
>> It is possible to re-condition sump oil onboard using a 'depth-media'
>> filtration using the same cellulose filter media but requires a very
>> LARGE filter set ..... but the surfactants and other additives would
>> have to be replaced. Oil never 'wears out' it becomes contaminated
>> with the byproducts of combustion: acids, metal particulate, etc. and
>> if you add back the needed 'chemicals' to particulate free oil you will
>> never have to change .... as do many truck fleet operations.
>> Moral of the story: dont worry about the retention rating of a
>> recirculation filter; just put on the LARGEST filter you can find. The
>> LARGEST will have the least resistance to flow and will allow
>> faster total volume recirculation throughput, the faster throughput
>> allowing exponentially greater opportunity of capture of much smaller
>> (submicronic) particles. In engineering geek-speak all you have to
>> do is filter to a level of 1/5 the size of the smallest orfice or
>> clearance that you're trying to protect ..... and everything will be
>> FINE .... This 1/5th 'yardstick' will prevent the particles from
>> agglomerating and 'bridging' thus scouring the clearance or blocking
>> the orfice. ( The 1/5 rule also applies to 'single pass'
>> filtration.such as fuel systems)
>>
>>
>>
>>>> I have had the opportunity to study quite a lot of closely held
>>>> oil/filter/wear information. Here's the basics:
>>>>
>>>> Keeping oil clean is the primary goal. What is 'clean'? The primary
>>>> component of 'clean' is particulate loading and particulate size. Your
>>>> normal paper oil filter filters out most of the particulates 25
>>>> microns and
>>>> larger. That's 0.001 inches. The smaller chunks keep circulating.
>>>> Think
>>>> about a low viscosity slurry of oil and rubbing compound.
>>>>
>

--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/

Jerry Bransford

I haven't heard of any oil filter that doesn't have a check valve Frank.
Even the cheapest Fram filters have that.

Jerry

FrankW wrote:
> I heard somewhere that the better filters have a check valve
> to prevent the back flow of oil. This true?
> I always get the mopar filter, but which filters are
> considered better than OEM?
>
>
> Rich Hampel wrote:
>
>> No no no no no
>>
>> Its true that a resinated paper removes ~25 micrometer particles (at
>> about 98% efficiency) but such paper also has removal efficiency at the
>> submicronic range but to a few% removal capacity (called a 'beta curve'
>> in filter-geek speak). Since the oil RECIRCULATES constantly through
>> the filter media the reduction of particle size continues and will
>> 'level-out' at some predetermined level (probably at about 0.5-
>> 1,0µM). A filter also becomes more efficient at removal size as more
>> debris is
>> captured (clogging the 'holes' and leaving smaller flow paths).
>> In a perfect world one would have a differential pressure gage mounted
>> across the oil filter to indicate when to change - when the
>> differential pressure starts to quickly increase - indicating that the
>> volumetric flow is declining.
>> It is possible to re-condition sump oil onboard using a 'depth-media'
>> filtration using the same cellulose filter media but requires a very
>> LARGE filter set ..... but the surfactants and other additives would
>> have to be replaced. Oil never 'wears out' it becomes contaminated
>> with the byproducts of combustion: acids, metal particulate, etc. and
>> if you add back the needed 'chemicals' to particulate free oil you will
>> never have to change .... as do many truck fleet operations.
>> Moral of the story: dont worry about the retention rating of a
>> recirculation filter; just put on the LARGEST filter you can find. The
>> LARGEST will have the least resistance to flow and will allow
>> faster total volume recirculation throughput, the faster throughput
>> allowing exponentially greater opportunity of capture of much smaller
>> (submicronic) particles. In engineering geek-speak all you have to
>> do is filter to a level of 1/5 the size of the smallest orfice or
>> clearance that you're trying to protect ..... and everything will be
>> FINE .... This 1/5th 'yardstick' will prevent the particles from
>> agglomerating and 'bridging' thus scouring the clearance or blocking
>> the orfice. ( The 1/5 rule also applies to 'single pass'
>> filtration.such as fuel systems)
>>
>>
>>
>>>> I have had the opportunity to study quite a lot of closely held
>>>> oil/filter/wear information. Here's the basics:
>>>>
>>>> Keeping oil clean is the primary goal. What is 'clean'? The primary
>>>> component of 'clean' is particulate loading and particulate size. Your
>>>> normal paper oil filter filters out most of the particulates 25
>>>> microns and
>>>> larger. That's 0.001 inches. The smaller chunks keep circulating.
>>>> Think
>>>> about a low viscosity slurry of oil and rubbing compound.
>>>>
>

--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/

FrankW

Well I wouldn't be surprised if the cheapest Crappy tire
filter didn't have one. Actually someone told me that some don't.
Didn't mention a brand though.

Jerry Bransford wrote:

> I haven't heard of any oil filter that doesn't have a check valve Frank.
> Even the cheapest Fram filters have that.
>
> Jerry
>
> FrankW wrote:
>
>> I heard somewhere that the better filters have a check valve
>> to prevent the back flow of oil. This true?
>> I always get the mopar filter, but which filters are
>> considered better than OEM?
>>
>>
>> Rich Hampel wrote:
>>
>>> No no no no no
>>>
>>> Its true that a resinated paper removes ~25 micrometer particles (at
>>> about 98% efficiency) but such paper also has removal efficiency at the
>>> submicronic range but to a few% removal capacity (called a 'beta curve'
>>> in filter-geek speak). Since the oil RECIRCULATES constantly through
>>> the filter media the reduction of particle size continues and will
>>> 'level-out' at some predetermined level (probably at about 0.5-
>>> 1,0µM). A filter also becomes more efficient at removal size as more
>>> debris is
>>> captured (clogging the 'holes' and leaving smaller flow paths).
>>> In a perfect world one would have a differential pressure gage mounted
>>> across the oil filter to indicate when to change - when the
>>> differential pressure starts to quickly increase - indicating that the
>>> volumetric flow is declining. It is possible to re-condition sump
>>> oil onboard using a 'depth-media'
>>> filtration using the same cellulose filter media but requires a very
>>> LARGE filter set ..... but the surfactants and other additives would
>>> have to be replaced. Oil never 'wears out' it becomes contaminated
>>> with the byproducts of combustion: acids, metal particulate, etc. and
>>> if you add back the needed 'chemicals' to particulate free oil you will
>>> never have to change .... as do many truck fleet operations. Moral
>>> of the story: dont worry about the retention rating of a
>>> recirculation filter; just put on the LARGEST filter you can find.
>>> The LARGEST will have the least resistance to flow and will allow
>>> faster total volume recirculation throughput, the faster throughput
>>> allowing exponentially greater opportunity of capture of much smaller
>>> (submicronic) particles. In engineering geek-speak all you have to
>>> do is filter to a level of 1/5 the size of the smallest orfice or
>>> clearance that you're trying to protect ..... and everything will be
>>> FINE .... This 1/5th 'yardstick' will prevent the particles from
>>> agglomerating and 'bridging' thus scouring the clearance or blocking
>>> the orfice. ( The 1/5 rule also applies to 'single pass'
>>> filtration.such as fuel systems)
>>>
>>>
>>>
>>>>> I have had the opportunity to study quite a lot of closely held
>>>>> oil/filter/wear information. Here's the basics:
>>>>>
>>>>> Keeping oil clean is the primary goal. What is 'clean'? The primary
>>>>> component of 'clean' is particulate loading and particulate size.
>>>>> Your
>>>>> normal paper oil filter filters out most of the particulates 25
>>>>> microns and
>>>>> larger. That's 0.001 inches. The smaller chunks keep
>>>>> circulating. Think
>>>>> about a low viscosity slurry of oil and rubbing compound.
>>>>>
>>
>

FrankW

Well I wouldn't be surprised if the cheapest Crappy tire
filter didn't have one. Actually someone told me that some don't.
Didn't mention a brand though.

Jerry Bransford wrote:

> I haven't heard of any oil filter that doesn't have a check valve Frank.
> Even the cheapest Fram filters have that.
>
> Jerry
>
> FrankW wrote:
>
>> I heard somewhere that the better filters have a check valve
>> to prevent the back flow of oil. This true?
>> I always get the mopar filter, but which filters are
>> considered better than OEM?
>>
>>
>> Rich Hampel wrote:
>>
>>> No no no no no
>>>
>>> Its true that a resinated paper removes ~25 micrometer particles (at
>>> about 98% efficiency) but such paper also has removal efficiency at the
>>> submicronic range but to a few% removal capacity (called a 'beta curve'
>>> in filter-geek speak). Since the oil RECIRCULATES constantly through
>>> the filter media the reduction of particle size continues and will
>>> 'level-out' at some predetermined level (probably at about 0.5-
>>> 1,0µM). A filter also becomes more efficient at removal size as more
>>> debris is
>>> captured (clogging the 'holes' and leaving smaller flow paths).
>>> In a perfect world one would have a differential pressure gage mounted
>>> across the oil filter to indicate when to change - when the
>>> differential pressure starts to quickly increase - indicating that the
>>> volumetric flow is declining. It is possible to re-condition sump
>>> oil onboard using a 'depth-media'
>>> filtration using the same cellulose filter media but requires a very
>>> LARGE filter set ..... but the surfactants and other additives would
>>> have to be replaced. Oil never 'wears out' it becomes contaminated
>>> with the byproducts of combustion: acids, metal particulate, etc. and
>>> if you add back the needed 'chemicals' to particulate free oil you will
>>> never have to change .... as do many truck fleet operations. Moral
>>> of the story: dont worry about the retention rating of a
>>> recirculation filter; just put on the LARGEST filter you can find.
>>> The LARGEST will have the least resistance to flow and will allow
>>> faster total volume recirculation throughput, the faster throughput
>>> allowing exponentially greater opportunity of capture of much smaller
>>> (submicronic) particles. In engineering geek-speak all you have to
>>> do is filter to a level of 1/5 the size of the smallest orfice or
>>> clearance that you're trying to protect ..... and everything will be
>>> FINE .... This 1/5th 'yardstick' will prevent the particles from
>>> agglomerating and 'bridging' thus scouring the clearance or blocking
>>> the orfice. ( The 1/5 rule also applies to 'single pass'
>>> filtration.such as fuel systems)
>>>
>>>
>>>
>>>>> I have had the opportunity to study quite a lot of closely held
>>>>> oil/filter/wear information. Here's the basics:
>>>>>
>>>>> Keeping oil clean is the primary goal. What is 'clean'? The primary
>>>>> component of 'clean' is particulate loading and particulate size.
>>>>> Your
>>>>> normal paper oil filter filters out most of the particulates 25
>>>>> microns and
>>>>> larger. That's 0.001 inches. The smaller chunks keep
>>>>> circulating. Think
>>>>> about a low viscosity slurry of oil and rubbing compound.
>>>>>
>>
>

FrankW

Well I wouldn't be surprised if the cheapest Crappy tire
filter didn't have one. Actually someone told me that some don't.
Didn't mention a brand though.

Jerry Bransford wrote:

> I haven't heard of any oil filter that doesn't have a check valve Frank.
> Even the cheapest Fram filters have that.
>
> Jerry
>
> FrankW wrote:
>
>> I heard somewhere that the better filters have a check valve
>> to prevent the back flow of oil. This true?
>> I always get the mopar filter, but which filters are
>> considered better than OEM?
>>
>>
>> Rich Hampel wrote:
>>
>>> No no no no no
>>>
>>> Its true that a resinated paper removes ~25 micrometer particles (at
>>> about 98% efficiency) but such paper also has removal efficiency at the
>>> submicronic range but to a few% removal capacity (called a 'beta curve'
>>> in filter-geek speak). Since the oil RECIRCULATES constantly through
>>> the filter media the reduction of particle size continues and will
>>> 'level-out' at some predetermined level (probably at about 0.5-
>>> 1,0µM). A filter also becomes more efficient at removal size as more
>>> debris is
>>> captured (clogging the 'holes' and leaving smaller flow paths).
>>> In a perfect world one would have a differential pressure gage mounted
>>> across the oil filter to indicate when to change - when the
>>> differential pressure starts to quickly increase - indicating that the
>>> volumetric flow is declining. It is possible to re-condition sump
>>> oil onboard using a 'depth-media'
>>> filtration using the same cellulose filter media but requires a very
>>> LARGE filter set ..... but the surfactants and other additives would
>>> have to be replaced. Oil never 'wears out' it becomes contaminated
>>> with the byproducts of combustion: acids, metal particulate, etc. and
>>> if you add back the needed 'chemicals' to particulate free oil you will
>>> never have to change .... as do many truck fleet operations. Moral
>>> of the story: dont worry about the retention rating of a
>>> recirculation filter; just put on the LARGEST filter you can find.
>>> The LARGEST will have the least resistance to flow and will allow
>>> faster total volume recirculation throughput, the faster throughput
>>> allowing exponentially greater opportunity of capture of much smaller
>>> (submicronic) particles. In engineering geek-speak all you have to
>>> do is filter to a level of 1/5 the size of the smallest orfice or
>>> clearance that you're trying to protect ..... and everything will be
>>> FINE .... This 1/5th 'yardstick' will prevent the particles from
>>> agglomerating and 'bridging' thus scouring the clearance or blocking
>>> the orfice. ( The 1/5 rule also applies to 'single pass'
>>> filtration.such as fuel systems)
>>>
>>>
>>>
>>>>> I have had the opportunity to study quite a lot of closely held
>>>>> oil/filter/wear information. Here's the basics:
>>>>>
>>>>> Keeping oil clean is the primary goal. What is 'clean'? The primary
>>>>> component of 'clean' is particulate loading and particulate size.
>>>>> Your
>>>>> normal paper oil filter filters out most of the particulates 25
>>>>> microns and
>>>>> larger. That's 0.001 inches. The smaller chunks keep
>>>>> circulating. Think
>>>>> about a low viscosity slurry of oil and rubbing compound.
>>>>>
>>
>

Mike Romain

The ones that call for a backflow valve get them, especially the CT
ones!

I do not think the filter on the 258 has one because the filter sits
down so it can't empty out by itself. Not sure about the 4.0 filters.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

FrankW wrote:
>
> Well I wouldn't be surprised if the cheapest Crappy tire
> filter didn't have one. Actually someone told me that some don't.
> Didn't mention a brand though.
>
> Jerry Bransford wrote:
>
> > I haven't heard of any oil filter that doesn't have a check valve Frank.
> > Even the cheapest Fram filters have that.
> >
> > Jerry
> >
> > FrankW wrote:
> >
> >> I heard somewhere that the better filters have a check valve
> >> to prevent the back flow of oil. This true?
> >> I always get the mopar filter, but which filters are
> >> considered better than OEM?
> >>
> >>
> >> Rich Hampel wrote:
> >>
> >>> No no no no no
> >>>
> >>> Its true that a resinated paper removes ~25 micrometer particles (at
> >>> about 98% efficiency) but such paper also has removal efficiency at the
> >>> submicronic range but to a few% removal capacity (called a 'beta curve'
> >>> in filter-geek speak). Since the oil RECIRCULATES constantly through
> >>> the filter media the reduction of particle size continues and will
> >>> 'level-out' at some predetermined level (probably at about 0.5-
> >>> 1,0µM). A filter also becomes more efficient at removal size as more
> >>> debris is
> >>> captured (clogging the 'holes' and leaving smaller flow paths).
> >>> In a perfect world one would have a differential pressure gage mounted
> >>> across the oil filter to indicate when to change - when the
> >>> differential pressure starts to quickly increase - indicating that the
> >>> volumetric flow is declining. It is possible to re-condition sump
> >>> oil onboard using a 'depth-media'
> >>> filtration using the same cellulose filter media but requires a very
> >>> LARGE filter set ..... but the surfactants and other additives would
> >>> have to be replaced. Oil never 'wears out' it becomes contaminated
> >>> with the byproducts of combustion: acids, metal particulate, etc. and
> >>> if you add back the needed 'chemicals' to particulate free oil you will
> >>> never have to change .... as do many truck fleet operations. Moral
> >>> of the story: dont worry about the retention rating of a
> >>> recirculation filter; just put on the LARGEST filter you can find.
> >>> The LARGEST will have the least resistance to flow and will allow
> >>> faster total volume recirculation throughput, the faster throughput
> >>> allowing exponentially greater opportunity of capture of much smaller
> >>> (submicronic) particles. In engineering geek-speak all you have to
> >>> do is filter to a level of 1/5 the size of the smallest orfice or
> >>> clearance that you're trying to protect ..... and everything will be
> >>> FINE .... This 1/5th 'yardstick' will prevent the particles from
> >>> agglomerating and 'bridging' thus scouring the clearance or blocking
> >>> the orfice. ( The 1/5 rule also applies to 'single pass'
> >>> filtration.such as fuel systems)
> >>>
> >>>
> >>>
> >>>>> I have had the opportunity to study quite a lot of closely held
> >>>>> oil/filter/wear information. Here's the basics:
> >>>>>
> >>>>> Keeping oil clean is the primary goal. What is 'clean'? The primary
> >>>>> component of 'clean' is particulate loading and particulate size.
> >>>>> Your
> >>>>> normal paper oil filter filters out most of the particulates 25
> >>>>> microns and
> >>>>> larger. That's 0.001 inches. The smaller chunks keep
> >>>>> circulating. Think
> >>>>> about a low viscosity slurry of oil and rubbing compound.
> >>>>>
> >>
> >

Mike Romain

The ones that call for a backflow valve get them, especially the CT
ones!

I do not think the filter on the 258 has one because the filter sits
down so it can't empty out by itself. Not sure about the 4.0 filters.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

FrankW wrote:
>
> Well I wouldn't be surprised if the cheapest Crappy tire
> filter didn't have one. Actually someone told me that some don't.
> Didn't mention a brand though.
>
> Jerry Bransford wrote:
>
> > I haven't heard of any oil filter that doesn't have a check valve Frank.
> > Even the cheapest Fram filters have that.
> >
> > Jerry
> >
> > FrankW wrote:
> >
> >> I heard somewhere that the better filters have a check valve
> >> to prevent the back flow of oil. This true?
> >> I always get the mopar filter, but which filters are
> >> considered better than OEM?
> >>
> >>
> >> Rich Hampel wrote:
> >>
> >>> No no no no no
> >>>
> >>> Its true that a resinated paper removes ~25 micrometer particles (at
> >>> about 98% efficiency) but such paper also has removal efficiency at the
> >>> submicronic range but to a few% removal capacity (called a 'beta curve'
> >>> in filter-geek speak). Since the oil RECIRCULATES constantly through
> >>> the filter media the reduction of particle size continues and will
> >>> 'level-out' at some predetermined level (probably at about 0.5-
> >>> 1,0µM). A filter also becomes more efficient at removal size as more
> >>> debris is
> >>> captured (clogging the 'holes' and leaving smaller flow paths).
> >>> In a perfect world one would have a differential pressure gage mounted
> >>> across the oil filter to indicate when to change - when the
> >>> differential pressure starts to quickly increase - indicating that the
> >>> volumetric flow is declining. It is possible to re-condition sump
> >>> oil onboard using a 'depth-media'
> >>> filtration using the same cellulose filter media but requires a very
> >>> LARGE filter set ..... but the surfactants and other additives would
> >>> have to be replaced. Oil never 'wears out' it becomes contaminated
> >>> with the byproducts of combustion: acids, metal particulate, etc. and
> >>> if you add back the needed 'chemicals' to particulate free oil you will
> >>> never have to change .... as do many truck fleet operations. Moral
> >>> of the story: dont worry about the retention rating of a
> >>> recirculation filter; just put on the LARGEST filter you can find.
> >>> The LARGEST will have the least resistance to flow and will allow
> >>> faster total volume recirculation throughput, the faster throughput
> >>> allowing exponentially greater opportunity of capture of much smaller
> >>> (submicronic) particles. In engineering geek-speak all you have to
> >>> do is filter to a level of 1/5 the size of the smallest orfice or
> >>> clearance that you're trying to protect ..... and everything will be
> >>> FINE .... This 1/5th 'yardstick' will prevent the particles from
> >>> agglomerating and 'bridging' thus scouring the clearance or blocking
> >>> the orfice. ( The 1/5 rule also applies to 'single pass'
> >>> filtration.such as fuel systems)
> >>>
> >>>
> >>>
> >>>>> I have had the opportunity to study quite a lot of closely held
> >>>>> oil/filter/wear information. Here's the basics:
> >>>>>
> >>>>> Keeping oil clean is the primary goal. What is 'clean'? The primary
> >>>>> component of 'clean' is particulate loading and particulate size.
> >>>>> Your
> >>>>> normal paper oil filter filters out most of the particulates 25
> >>>>> microns and
> >>>>> larger. That's 0.001 inches. The smaller chunks keep
> >>>>> circulating. Think
> >>>>> about a low viscosity slurry of oil and rubbing compound.
> >>>>>
> >>
> >

Mike Romain

The ones that call for a backflow valve get them, especially the CT
ones!

I do not think the filter on the 258 has one because the filter sits
down so it can't empty out by itself. Not sure about the 4.0 filters.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

FrankW wrote:
>
> Well I wouldn't be surprised if the cheapest Crappy tire
> filter didn't have one. Actually someone told me that some don't.
> Didn't mention a brand though.
>
> Jerry Bransford wrote:
>
> > I haven't heard of any oil filter that doesn't have a check valve Frank.
> > Even the cheapest Fram filters have that.
> >
> > Jerry
> >
> > FrankW wrote:
> >
> >> I heard somewhere that the better filters have a check valve
> >> to prevent the back flow of oil. This true?
> >> I always get the mopar filter, but which filters are
> >> considered better than OEM?
> >>
> >>
> >> Rich Hampel wrote:
> >>
> >>> No no no no no
> >>>
> >>> Its true that a resinated paper removes ~25 micrometer particles (at
> >>> about 98% efficiency) but such paper also has removal efficiency at the
> >>> submicronic range but to a few% removal capacity (called a 'beta curve'
> >>> in filter-geek speak). Since the oil RECIRCULATES constantly through
> >>> the filter media the reduction of particle size continues and will
> >>> 'level-out' at some predetermined level (probably at about 0.5-
> >>> 1,0µM). A filter also becomes more efficient at removal size as more
> >>> debris is
> >>> captured (clogging the 'holes' and leaving smaller flow paths).
> >>> In a perfect world one would have a differential pressure gage mounted
> >>> across the oil filter to indicate when to change - when the
> >>> differential pressure starts to quickly increase - indicating that the
> >>> volumetric flow is declining. It is possible to re-condition sump
> >>> oil onboard using a 'depth-media'
> >>> filtration using the same cellulose filter media but requires a very
> >>> LARGE filter set ..... but the surfactants and other additives would
> >>> have to be replaced. Oil never 'wears out' it becomes contaminated
> >>> with the byproducts of combustion: acids, metal particulate, etc. and
> >>> if you add back the needed 'chemicals' to particulate free oil you will
> >>> never have to change .... as do many truck fleet operations. Moral
> >>> of the story: dont worry about the retention rating of a
> >>> recirculation filter; just put on the LARGEST filter you can find.
> >>> The LARGEST will have the least resistance to flow and will allow
> >>> faster total volume recirculation throughput, the faster throughput
> >>> allowing exponentially greater opportunity of capture of much smaller
> >>> (submicronic) particles. In engineering geek-speak all you have to
> >>> do is filter to a level of 1/5 the size of the smallest orfice or
> >>> clearance that you're trying to protect ..... and everything will be
> >>> FINE .... This 1/5th 'yardstick' will prevent the particles from
> >>> agglomerating and 'bridging' thus scouring the clearance or blocking
> >>> the orfice. ( The 1/5 rule also applies to 'single pass'
> >>> filtration.such as fuel systems)
> >>>
> >>>
> >>>
> >>>>> I have had the opportunity to study quite a lot of closely held
> >>>>> oil/filter/wear information. Here's the basics:
> >>>>>
> >>>>> Keeping oil clean is the primary goal. What is 'clean'? The primary
> >>>>> component of 'clean' is particulate loading and particulate size.
> >>>>> Your
> >>>>> normal paper oil filter filters out most of the particulates 25
> >>>>> microns and
> >>>>> larger. That's 0.001 inches. The smaller chunks keep
> >>>>> circulating. Think
> >>>>> about a low viscosity slurry of oil and rubbing compound.
> >>>>>
> >>
> >

Steve

Frank,

Most have anti-drain back these days, but some valve designs are more
effective than others:

http://minimopar.knizefamily.net/oilfilterstudy.html

Interestingly, Canadian Tire Motomaster/Formula One filters are all
rebranded Frams. Same is true of Quaker State/Pennzoil. If you're buying
filters at Canadian Tire, get K&N. Elsewhere, try Carquest Premium (aka
NAPA Gold).

Even some Mopar filters are Frams in disguise:

http://minimopar.knizefamily.net/oil...udy-mopar.html

Steve
http://xjeep.dyndns.org


FrankW wrote:
> Well I wouldn't be surprised if the cheapest Crappy tire
> filter didn't have one. Actually someone told me that some don't.
> Didn't mention a brand though.
>
> Jerry Bransford wrote:
>
>> I haven't heard of any oil filter that doesn't have a check valve
>> Frank. Even the cheapest Fram filters have that.

Steve

Frank,

Most have anti-drain back these days, but some valve designs are more
effective than others:

http://minimopar.knizefamily.net/oilfilterstudy.html

Interestingly, Canadian Tire Motomaster/Formula One filters are all
rebranded Frams. Same is true of Quaker State/Pennzoil. If you're buying
filters at Canadian Tire, get K&N. Elsewhere, try Carquest Premium (aka
NAPA Gold).

Even some Mopar filters are Frams in disguise:

http://minimopar.knizefamily.net/oil...udy-mopar.html

Steve
http://xjeep.dyndns.org


FrankW wrote:
> Well I wouldn't be surprised if the cheapest Crappy tire
> filter didn't have one. Actually someone told me that some don't.
> Didn't mention a brand though.
>
> Jerry Bransford wrote:
>
>> I haven't heard of any oil filter that doesn't have a check valve
>> Frank. Even the cheapest Fram filters have that.