08-21-2024, 11:27 PM | #1793 | |
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2013 Series 10 FRS #553
RCE T2's, SPC LCAs -4/2.6 camber JDL 4-2-1 EL, FP and OP, Tuned by Zach@CSG on e85 RR Wilwood Front/Rear Sport BBK, Motul 600 Fluid ARC-8 17x9 SX2 GTs 245s/Koing 17x8 v730's 225's |
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08-22-2024, 08:51 AM | #1794 | |
Anti stance.
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08-22-2024, 10:14 AM | #1795 | |
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For the FA20 you have to add in an oil passage and restrict the flow on another to allow the journal bearings to be fed equally. A description of that issue is found on this very forum:
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Finally, the oil pan capacity isn't really sufficient when pulling sustained lateral G. It's just a physical limitation of the horizontally-opposed design and gravity. A baffled oil pan can help some but you're safer with a higher-capacity baffled pan and/or an Accusump accumulator. When someone mentions the "inherent issues with a boxer engine design" the obvious comparison - Porsche - comes to mind. Well, for their high-performance engines (most 911 models) they use a dry sump system from the factory. For the "lower-performance" early-gen watercooled engines in the Cayman and Boxter, their oil capacities were gigantic compared to the FA20 - almost 8 quarts of oil in the Cayman vs. 5.8(ish) for the Twins. And that's leaving aside design differences in oil supply and routing. As far as I know - I haven't researched it as much as I wasn't even planning on build an FA24 - Subaru/Toyota didn't do anything to address the preexisting issues with the FA20's oiling, and in fact made it worse with the change to a multi-screen plastic oil pickup design. The addition of the now well-known issue of too much RTV being applied from the factory causing the oil pickup tube to become partially or completely clogged muddied the waters a bit, but overall it seems these issues will persist on stock engines. |
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08-22-2024, 12:36 PM | #1796 | |
Anti stance.
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