DragBikeMike
Serious Thumper
Offline
SuzukiSavage.com Rocks!
Posts: 4398
Honolulu
|
I started the test using a 51.85mm orifice which is rated 209 CFM @ 15” H2O. As I said, I was hoping I would have at least enough restriction to test @ 5” H2O and then convert the data. I wasn’t able to achieve 5” H20 test pressure. There just isn’t enough restriction. So, I started trying to test at the maximum depression I could achieve. At first, that seemed to be working OK, but then I started having trouble with repeatability. As the day wore on, and the temperature, humidity, and barometric pressure changed, the test results changed. I was frustrated, so I sat down and thought things out.
The main reason I built this contraption was to be able to test components on a level playing field. Always test at the same pressure from one test piece to another. Then it dawned on me, find out which element had the lowest depression at full flow, and then test each filter at that pressure. If you have to apply a higher test pressure to achieve the same flow, the filter under test obviously doesn’t perform as well. Note that on this test, when I use the term “test pressure”, it refers to a negative value (vacuum).
So, I started over. I tested each filter with all bleed valves closed to find out which one resulted in the smallest test pressure. I did baseline runs using the 51.85mm orifice on all the filter elements to determine which element resulted in the lowest pressure. Then I did a single run using a 42.38mm orifice on the best performing element. I felt that two sets of data would allow cross checks to make sure things made sense. The K&N pulled the smallest test pressure, so it was already evident which element performs best. But I wanted to practice and learn, so I continued with the full test.
Full Pull Test Pressures (51.85mm orifice, all bleeds closed)
Stock: 1-7/8” H2O K&N: 1” H2O Poly-fil dry: 2” H2O Poly-fil canola oil: 2-3/4” H2O Pol-fil K&N oil: 2-1/2” H2O
Full Pull Test Pressures (42.38mm orifice, all bleeds closed)
K&N: ¾” H2O
|