10-27-2021, 07:28 AM
We all have our reasons to replace filters and it is good to hear some useful numbers and results.
Sometimes i cannot help myself and look for ways to quantify or measure the size of the problem, I'm curious.
So i looked at some pictures and one showed the drain tube at the bottom of the air filter, this is a clear tube which ends in a black plastic removable plug at the end and is easy to access, since it is in the space of the airbox which is after the filter i thought i could measure the small difference in air pressure when the engine is running.
The result is this small video which shows the change in pressure ( the differential ) across the air filter which has had 57.000 easy kilometers of use.
Could be someone can repeat this test and tell their values, mine only recorded 4 mm. of rise in one end of the tube, the other of course went down by the same amount, hope this sheds some light on the capacity of the air filter;
https://youtu.be/BUrSE-w4zfg
Also wondered if the breather pipe of the positive crank case made a difference, removed the oil filler cap to check and found zero difference in the measurement, i guess my blow-by is not significant enough at this stage.
With my riding style I'm with Tev, it's a big area, so see for yourself.
Sometimes i cannot help myself and look for ways to quantify or measure the size of the problem, I'm curious.
So i looked at some pictures and one showed the drain tube at the bottom of the air filter, this is a clear tube which ends in a black plastic removable plug at the end and is easy to access, since it is in the space of the airbox which is after the filter i thought i could measure the small difference in air pressure when the engine is running.
The result is this small video which shows the change in pressure ( the differential ) across the air filter which has had 57.000 easy kilometers of use.
Could be someone can repeat this test and tell their values, mine only recorded 4 mm. of rise in one end of the tube, the other of course went down by the same amount, hope this sheds some light on the capacity of the air filter;
https://youtu.be/BUrSE-w4zfg
Also wondered if the breather pipe of the positive crank case made a difference, removed the oil filler cap to check and found zero difference in the measurement, i guess my blow-by is not significant enough at this stage.
With my riding style I'm with Tev, it's a big area, so see for yourself.