*affect* is the vb.If these filters were to have a higher bypass valve setting would it effect a Honda engine?
The Honda engine doesn’t have a positive displacement oil pump?My understanding is that Honda has a lower bypass setting because they do not want their engines to be starved at all of oil flow whereas Subaru utilizes a positive displacement oil pump which effectively forces oil through filter media.
Hey thats's ZeeOSix's line!The Honda engine doesn’t have a positive displacement oil pump?
My Honda has a positive displacement oil pump so it should be able to handle a Subaru oil filterSubaru utilizes a positive displacement oil pump which effectively forces oil through filter media.
My Honda has a positive displacement oil pump so it should be able to handle a Subaru oil filter
All engines use a positive displacement oil pump.My understanding is that Honda has a lower bypass setting because they do not want their engines to be starved at all of oil flow whereas Subaru utilizes a positive displacement oil pump which effectively forces oil through filter media.
If it's an old fashioned spring loaded bypass valve in the pump, then it will still have some pressure and output flow creap even when the pump is in pressure relief. It's possible that a pump with some sophisticated ECU control system might be "constant pressure" pump once in relief if the computer control system is really good.Hey thats's ZeeOSix's line!
and my line is:
"Once you run up to the pump bypass relief it's constant pressure at the filter inlet"
"Slow down flow" in this case could only mean a reduction in oil flow from the pump. That can only happen if the oil pump is into pressure relief.If you are doing lots of starts in -20F, with 5W30 conventional oil, then the high bypass may slow down flow even more?
All engines use a positive displacement oil pump.
The downside of a filter with a real high bypass valve setting is that if the filter does get clogged enough, or the dP gets to the bypass setting for whatever reason (insane pump flow with thicker oil), then it puts the oil pump farther into pressure relief and pump volume flow reduction before the filter bypass valve opens up.
The upside to a filter with a real high bypass valve setting is that the filter is much less likely to go into bypass.
What that would mean however is that Honda is intentionally planning for an oil filter to no longer filter, just so they can permit the owner to leave the filter in the engine for two OCI. I would suggest that Honda recommends leaving it there is because the filter is unlikely to be clogged after those two OCI. This would correlate to my experience where I have never seen a filter come anywhere near to being clogged with debris, even on my old “sludge monster” 1MZ-FE.An additional thought I had was that the Honda OEM oil filter is made to use on two consecutive OCIs and this is coming from Honda directly. The Honda recommended OCI is not to exceed 10,000 miles, so they allow for the OEM oil filter to be used for up to 20,000 miles which would suggest that it may become saturated and bypass events are more likely to occur. To accommodate for that likelihood they have set the bypass valve to a lower setting.
The pumps do wear and increase internal leakage over time, and with more pressure, there would be more internal leakage, but that is more of a low viscosity oil at high temperatures, problem I guess?"Slow down flow" in this case could only mean a reduction in oil flow from the pump. That can only happen if the oil pump is into pressure relief.