Originally Posted By: goodtimes
Originally Posted By: ZeeOSix
Originally Posted By: goodtimes
I have come to the conclusion they are all shady about the efficiency % except Champ who uses the 98.7% efficiency point, the statistical limit of the test.
From the Fram paper that was published in 2003 you get this idea from.
"End-users should also be wary of numbers games – they can also be played
with B ratios. B ratios higher than 75 indicate little additional improvement in
filtering efficiency. Furthermore, the test procedure to develop the B ratio is valid only for B value up to 75. For B ratios of 75 and higher, there are not
enough particles in downstream liquid samples to make counting them
statistically significant."
The accuracy of the test depends on the test methods and equipment. The test methods and equipment has improved since 2003, so accurately measuring a beta ratio better than 75 is most likely possible today. Feetgaurd and others who make very high efficiency filters routinely show filters with beta ratios measured well above 75.
The Fram bulletin says 98.67% is the limit due to statistical limit, not test equipment limit. This is still valid. So if all cos. would put the micron value at 98.67% the confusion would lessen. Fram maybe is 18 microns, Boss may be 22 and so on. The way the are doing it now is so their box is the one people buy. People will buy 99 over 98.7. Some probably round 98.7 to 99 to put on the boxes.
The one that is old, unverified, and wrongly used is the Amsoil chart.
I read the report and the report was written in 2003. Here is the quote: "For B ratios of 75 and higher, there are not
enough particles in downstream liquid samples to make counting them statistically significant." This would have been related to the ability of the particle counters available in 2003. Advances in technology since 2003 should improve upon the statistical precision of measuring particle counts.
Originally Posted By: ZeeOSix
Originally Posted By: goodtimes
I have come to the conclusion they are all shady about the efficiency % except Champ who uses the 98.7% efficiency point, the statistical limit of the test.
From the Fram paper that was published in 2003 you get this idea from.
"End-users should also be wary of numbers games – they can also be played
with B ratios. B ratios higher than 75 indicate little additional improvement in
filtering efficiency. Furthermore, the test procedure to develop the B ratio is valid only for B value up to 75. For B ratios of 75 and higher, there are not
enough particles in downstream liquid samples to make counting them
statistically significant."
The accuracy of the test depends on the test methods and equipment. The test methods and equipment has improved since 2003, so accurately measuring a beta ratio better than 75 is most likely possible today. Feetgaurd and others who make very high efficiency filters routinely show filters with beta ratios measured well above 75.
The Fram bulletin says 98.67% is the limit due to statistical limit, not test equipment limit. This is still valid. So if all cos. would put the micron value at 98.67% the confusion would lessen. Fram maybe is 18 microns, Boss may be 22 and so on. The way the are doing it now is so their box is the one people buy. People will buy 99 over 98.7. Some probably round 98.7 to 99 to put on the boxes.
The one that is old, unverified, and wrongly used is the Amsoil chart.
I read the report and the report was written in 2003. Here is the quote: "For B ratios of 75 and higher, there are not
enough particles in downstream liquid samples to make counting them statistically significant." This would have been related to the ability of the particle counters available in 2003. Advances in technology since 2003 should improve upon the statistical precision of measuring particle counts.