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So a few months ago I installed the LN oil adapter from the cartridge filter to the NAPE 1042. Today I opened the 1042 filter and see how small it is compared to the OE. Just thinking the more surface collecting the better the filtering should be. Using 0-40 Mobile on 04 Carrera with 48K miles. Thanks you your input. The NAPA filter has 1000 miles on it and the OE filter is new.
My understanding is that 100% of the oil is filtered by the Napa (Spin-on) filter, where some percentage of oil bypasses the OEM filter. In that case, the size difference doesn't tell the whole story.
The smaller filter isn't as bad as you think, smaller just means less ability to hold particles. It will simply clog faster, porsche chose a large oil filter area to extend service intervals out.
If you change the oil and filter more often (than porsche normal interval) you will be fine. I use stock and do mine around 6k miles.
My understanding is that 100% of the oil is filtered by the Napa (Spin-on) filter, where some percentage of oil bypasses the OEM filter. In that case, the size difference doesn't tell the whole story.
I believe this is during startup, when oil pressure is over 5bar it opens a relief valve.
My stock plastic filter cartridge is wrapped in rare earth magnets which collect ferrous material, it really works, last oil change they collected a little fine metallic spoodge on them.
[QUOTE=Chris(MA);14940549]I believe this is during startup, when oil pressure is over 5bar it opens a relief valve.
Your probably correct about start up pressure, but I was my understanding that the relief valve weakens over time and begins to open and bypass at lower pressures as well. If this was the case and say bypass occurs at 4.5bar, or 3.90bar which I've seen while spirited driving I would not want a problem to occur at a high RPM with good oil pressure pushing garbage through out my engine with the filter just letting it all just pass on by to be deposited into my crank bearings. LN adapter is something of a safety net to me to give me a chance at salvaging an engine if possible. I change my oil/filter at 3500mi and have the tool to cut open the filter to inspect.
The by-pass valve in the OEM canister does not open at a particular pressure, but rather at a "differential" pressure of 29psi (2 bar) difference between the pressure coming into the filter compared to the pressure going out of the filter.
The "differential" pressure can get high enough to open the by-pass if the filter becomes clogged, that is the purpose of it. Also on cold start up the "differential" pressure can briefly be enough to open the by-pass for a brief moment.
With a filter system with no by-pass, the oil pressure to the bearings will be low for a moment on cold starts.
Having said that, I am in the camp of favoring to have a momentary low pressure to the bearings on cold start, instead of the risk of allowing the oil to by-pass and possibly deliver debris to the bearings.
My solution is removing the by-pass from the plastic canister and either flipping the valve and spring, or filling the valve cup with Loctite E-120HP epoxy, thereby disabling the by-pass. I have 3 m96 engines on the road and have used both . I do prefer the cartridge type filter and use the K&N PS-7011 synthetic filter.
After my recent incident with failing IMSB, I am convinced the no-bypass LN adaptor and 1042 filter may just have saved my engine. I won't run without one.
04-13-2018, 06:03 PM
OM oil filter vs. LN adapter NAPA 1042
