Quote:
Originally Posted by Petah78
Interesting design. I guess it snaps onto the existing pick up to give it a larger filter area. It's like an extension/steroid to the redesigned pick up. lol
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The open area of the holes is larger than the OEM pickup's mesh, but chunks of RTV as shown in this thread will definitely be stopped by this pre-filter. Tough to see, but the external surface is also not flat (OEM is flat), so when the engine stops chunks can more easily fall away than on a flat surface vs stick to it. And being all external, much easier to clean than using a borescope, mirrors, and picks. There is also a LOT more open area on this pre-filter, so it would take a lot more RTV stuck to it before it will have any significant effect on flow.
Quote:
Originally Posted by Petah78
What kind of plastic is this made from? Can it handle the high heat? What kind of testing was done on this?
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Auto/Oil rated grade of Nylon. We've used them a lot from AOS', water pump inlets, and oil pans. The newer printing materials and process capabilities have come a long way. I never would have dreamed of bolting on printed plastic parts for real world testing 25 years ago!
Quote:
Originally Posted by FrickingReallySlow
Is it possible to have the strainer closer to the drain port in case you need to suction/scrap off some RTV without removing the pan in the future.
also do we need a strainer at all? wouldn't the oil pump just chew up any RTV into little bitty pieces that should easily pass through the main oil passage into the oil filter. If you big metal pieces that you need the strainer for then you're kinda already screwed no?
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There is an internal filter in the OEM pickup that can clog with debris. Large pieces never make it to the pump/filter.
Quote:
Originally Posted by NoHaveMSG
I have the same pressure drop at RPM. I suspect it could be the the pressure transducer placement though others have commented on it and suspected pump cavitation on the FA before.
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AVCS. IIRC it's ~5K RPMs (under load/WOT) where the cams transition. The oil feed that supplies AVCS draws more oil, and the system pressure drops some. All Subaru AVCS engines do this: EJ20/25, FA20/24. The only time pressure climbs fairly linear with RPM is when AVCS is deleted.
These pumps don't cavitate, at least not up to 10K RPMs. Aeration typically happens when the pump is bigger than the lubrication system is designed for... Like putting an oversized pump on a stock (or built to stock specs) block. That only pushes more oil through the bypass valve, eventually aerating.