quote:
Originally posted by Patman:
Bob, how come that new PureONE only had a 4psi drop when you saw well over 10psi drop the last time you tested it? Are you using hot oil now?
No. Let me explain what I am seeing.
First, I did not adjust the input after having it set without a filter.
Second, same oil, same pump, different motor driving the pump. The previous motor coudn't drive the pump more than about 30-45secs before it would over heat and blow the fuse. So, this was a bad test. What I have figured out is that each and every filter needs to stabalize out but running it for at least a min to 2 mins. The pressure will deviate due to the filter media having to "absorb" the oil before it could properly flow. I see the filter "filling" the media while running it for the 2 min warmup. So, now, I believe we are getting a more acurate picture of what the filters are doing.
The motor that I started to use was a 90vdc 1/2? horse motor. The new motor on the drill press was a 3/4 and it wouldn't run it. (remember, the 90 was a direct 1:1 shaft drive to the pump, the 3/4 uses pulleys and belts. It was suppose to be able to turn 3600rpm but had no real power under that load. So, I then went back and bought a 2hp reversible motor and put it on and now it doesnt' break a sweat running that pump. I can take it up to 60psi and hold it no problem.
So, the motor, speed, and time has all affected my first results which now I see as very inacurate and I may need to pull that thread so not to confuse the issue for others.
As for why my wear numbers become lower when I used a fram filter over a m1 filter is simple. Even though it appears(at this moment will verify)that m1 may have simular flow drops as the fram at first, I believe that it having better filtration, that it became more restrictive in a shorter period of time than the fram. The less efficent an filter, the longer it can run. The more efficent, the less as it will clog up sooner thus becoming less effecient(in flow) the more you run it. This is my thoughts on that and will prove this out as I am going to collect some used filters and test them as well against new ones.
Hope that helps explain it.
bob