Lelandwelds
Silver Member
The old diesel manufacturers didnt really put much effort into specifying what was "clean diesel". That has changed with the new but they dont make it easy to find. I had to learn about beta ratings and ISO 4406 contamination codes.
Beta ratings are single pass efficiency for a given particle size. ISO grades are:
Larger than 4 micron/ larger than 7 micron/ larger than 14 micron
The targeted reductions from "typical as delivered" diesel are severe. For each of the three sizes: 2,000,000 reduced to 32,000/ 1,000,000 to 8,000 / 130,000 to 1000 particles.
The filter manufactures dont volunteer this info. The engine mfg bury their requirements unless you have a warranty claim. The filter mfg whenthey do provide info are using tests from the high sulfur diesel era that is stripped of the additive package. The additives can reduce the effectiveness of the coalescing water trap style of filter. They are really stretching the definition of "nominal" and I think some of the results are for multi pass which isnt right for fuel. The white papers I have found are from the 1980s and 1990s. They do not name the exact filters tested but their results say a filter marketed as a 10 mic "nominal" should be called a 30 mic absolute. One positive thing they found was two filters with two different rratings trapped a far higher percentage and range of sizes than they did separately.
I found Clean Diesel - Donaldson Filtration Solutions - MyCleanDiesel.com to have a lot of good information that improved my searches. Anyone have some favorite sites that touch on the above?
Beta ratings are single pass efficiency for a given particle size. ISO grades are:
Larger than 4 micron/ larger than 7 micron/ larger than 14 micron
The targeted reductions from "typical as delivered" diesel are severe. For each of the three sizes: 2,000,000 reduced to 32,000/ 1,000,000 to 8,000 / 130,000 to 1000 particles.
The filter manufactures dont volunteer this info. The engine mfg bury their requirements unless you have a warranty claim. The filter mfg whenthey do provide info are using tests from the high sulfur diesel era that is stripped of the additive package. The additives can reduce the effectiveness of the coalescing water trap style of filter. They are really stretching the definition of "nominal" and I think some of the results are for multi pass which isnt right for fuel. The white papers I have found are from the 1980s and 1990s. They do not name the exact filters tested but their results say a filter marketed as a 10 mic "nominal" should be called a 30 mic absolute. One positive thing they found was two filters with two different rratings trapped a far higher percentage and range of sizes than they did separately.
I found Clean Diesel - Donaldson Filtration Solutions - MyCleanDiesel.com to have a lot of good information that improved my searches. Anyone have some favorite sites that touch on the above?