Originally Posted By: OVERKILL
Originally Posted By: ZeeOSix
Originally Posted By: OVERKILL
Of course this also means that we are now reliant on the next stage of your testing
Finding whether it is the restriction in the media or the viscosity of the oil that triggered the bypass event. It is quite possible for it to be a combination of the two.
It's definitely a combination of the two, and also a 3rd factor that creates delta-p, which is the oil volume flowing through the filter. The filter's flow resistance is basically fixed, the oil viscosity and oil flow rate (due to changing the speed of the oil pump with engine revs) are obviously variables.
High engine revs with thick oil will result in the highest delta-p across the oil filter, and hence the easiest way to make the filter go into by-pass as Jim's data shows.
Certainly
What I was digging at was more to the overall effect being an even split between the two, both being significant contributors, rather than one taking the majority of the blame, which seems to be the theory that is currently being considered, that the 10w-30 is the biggest contributor to the event, not the PureONE.
I'm thinking specifically as to media efficiency (PureONE vs Motorcraft) with the same oil in the pan, what we are going to see as to the net effect on initial surge/bypass on cold start (as in the tests so performed, there was a big difference between the two viscosities and also two different filters).
Essentially, I'd love to see the start-up with the 5w-20/Motorcraft combo replicated with 5w-20/PureONE to see how close they are
Would be interesting if we find that there is a larger than expected differential with the PureONE and 5w-20. Not saying this will be the case or that I even expect it, but it is possible and that intrigues me
That would be my guess too ... the viscosity is what's making the PureOne look more restrictive than the MC under the same cold start-up conditions. My guess is that if Jim does the same cold start-up with the PureOne with the same viscosity and temperature oil, you'll see a very similar dealt-p across the PureOne (my guess is within few PSI - maybe even less depending on the media area of each filter, which is another contributing factor).
Originally Posted By: ZeeOSix
Originally Posted By: OVERKILL
Of course this also means that we are now reliant on the next stage of your testing
It's definitely a combination of the two, and also a 3rd factor that creates delta-p, which is the oil volume flowing through the filter. The filter's flow resistance is basically fixed, the oil viscosity and oil flow rate (due to changing the speed of the oil pump with engine revs) are obviously variables.
High engine revs with thick oil will result in the highest delta-p across the oil filter, and hence the easiest way to make the filter go into by-pass as Jim's data shows.
Certainly
I'm thinking specifically as to media efficiency (PureONE vs Motorcraft) with the same oil in the pan, what we are going to see as to the net effect on initial surge/bypass on cold start (as in the tests so performed, there was a big difference between the two viscosities and also two different filters).
Essentially, I'd love to see the start-up with the 5w-20/Motorcraft combo replicated with 5w-20/PureONE to see how close they are
That would be my guess too ... the viscosity is what's making the PureOne look more restrictive than the MC under the same cold start-up conditions. My guess is that if Jim does the same cold start-up with the PureOne with the same viscosity and temperature oil, you'll see a very similar dealt-p across the PureOne (my guess is within few PSI - maybe even less depending on the media area of each filter, which is another contributing factor).