Originally Posted By: ZeeOSix
Originally Posted By: goodtimes
If the filter outlet pipe has a 1/2" ID and the bypass outlet has a 1/8" ID, then the little bypass outlet flows 1/16th of the total oil flow. If a filter is running at 16 qts/min oil flow, then the bypass is at 1 qt/min. So it takes 5 minutes to circulate the entire 5 qt sump through the bypass. On the highway going 60 mph the disk would filter all the oil every 5 miles. Just using easy numbers, not actually measuring the ID's. With it said 1 gram of harmful dirt is generated every 1000 miles, or 1000 mins at 60 mph, it can be seen very little isn't caught by the disk at any moment. In 1000 miles the disk filters all the oil 200 times in this example. I think my arithmetic is about right, someone can correct it if not.
It's not that simple. What flows through the micro-disc will be solely dependent on what it's flow resistance is with whatever delta-p is across the filter, regardless of the inlet/outlet holes assuming they are much larger than actually needed. The inlet/outlet holes are not there to control flow rate.
This is one thing I was going to point out earlier. Early in this thread UD said the MG filter flows 1~3% of the total flow through the micro-disc. I'm assuming those numbers are from MG, and if so I'm wondering how they've come up with that - purely by calculations on paper, or by actual lab measurements.
Assuming the micro-disc does flow 2% (middle of 1~3), and if cruising down the road at 60 MPH at 2000 RPM gives the oil pump output of 2 GPM with a sump of 5 qts of oil, then it would take the pump 0.625 min (37.5 sec) to circulate the 5 qts through the filter. It would therefore take 31.25 min (50 times longer) to circulate 5 qts worth through the micro-disc.
I know it isn't that simples, and that if the disk is more resistant to flow then numbers change. I used 4 gpm total flow. I think my rough number is more realistic than your rough number. The main thing to remember is we are talking about 1 gram of dirt per 1000 miles or 16.7 hours of driving at 60 mph. The amount of dirt generated per minute, or mile, is almost not measureable. Bypass filters keep the oil microscopically clean. They do work. But then we see pics of sludged over filters after 4k, which are not filtering anymore, so it all depends on the conditions and all is not so simple, you are right.
Originally Posted By: goodtimes
If the filter outlet pipe has a 1/2" ID and the bypass outlet has a 1/8" ID, then the little bypass outlet flows 1/16th of the total oil flow. If a filter is running at 16 qts/min oil flow, then the bypass is at 1 qt/min. So it takes 5 minutes to circulate the entire 5 qt sump through the bypass. On the highway going 60 mph the disk would filter all the oil every 5 miles. Just using easy numbers, not actually measuring the ID's. With it said 1 gram of harmful dirt is generated every 1000 miles, or 1000 mins at 60 mph, it can be seen very little isn't caught by the disk at any moment. In 1000 miles the disk filters all the oil 200 times in this example. I think my arithmetic is about right, someone can correct it if not.
It's not that simple. What flows through the micro-disc will be solely dependent on what it's flow resistance is with whatever delta-p is across the filter, regardless of the inlet/outlet holes assuming they are much larger than actually needed. The inlet/outlet holes are not there to control flow rate.
This is one thing I was going to point out earlier. Early in this thread UD said the MG filter flows 1~3% of the total flow through the micro-disc. I'm assuming those numbers are from MG, and if so I'm wondering how they've come up with that - purely by calculations on paper, or by actual lab measurements.
Assuming the micro-disc does flow 2% (middle of 1~3), and if cruising down the road at 60 MPH at 2000 RPM gives the oil pump output of 2 GPM with a sump of 5 qts of oil, then it would take the pump 0.625 min (37.5 sec) to circulate the 5 qts through the filter. It would therefore take 31.25 min (50 times longer) to circulate 5 qts worth through the micro-disc.
I know it isn't that simples, and that if the disk is more resistant to flow then numbers change. I used 4 gpm total flow. I think my rough number is more realistic than your rough number. The main thing to remember is we are talking about 1 gram of dirt per 1000 miles or 16.7 hours of driving at 60 mph. The amount of dirt generated per minute, or mile, is almost not measureable. Bypass filters keep the oil microscopically clean. They do work. But then we see pics of sludged over filters after 4k, which are not filtering anymore, so it all depends on the conditions and all is not so simple, you are right.
