Originally Posted by dave1251
The size really isn't as important as the testing results after the filters use. It would be interesting to see the efficiency ratings let's say after 200 hours of use.
For most filters the efficiency wiil probably get a bit lower as it loads up. Increased delta-p can causes captured particles to break loose and flow downstream. A smaller sized filter isn't going to hold as much debris as a larger filter, so the smaller filter will load faster and have more delta-p. This is why smaller filters might have a worse overall efficiency rating, like the two smallest spin-ons Purolators mentioned before.
The size really isn't as important as the testing results after the filters use. It would be interesting to see the efficiency ratings let's say after 200 hours of use.
For most filters the efficiency wiil probably get a bit lower as it loads up. Increased delta-p can causes captured particles to break loose and flow downstream. A smaller sized filter isn't going to hold as much debris as a larger filter, so the smaller filter will load faster and have more delta-p. This is why smaller filters might have a worse overall efficiency rating, like the two smallest spin-ons Purolators mentioned before.