{"id":5360,"date":"2022-10-01T00:00:00","date_gmt":"2022-10-01T04:00:00","guid":{"rendered":"https:\/\/www.etotheipiplusone.net\/?p=5360"},"modified":"2022-09-27T11:06:58","modified_gmt":"2022-09-27T15:06:58","slug":"operation-idiocracy-oil-return-and-bilge-pump","status":"publish","type":"post","link":"https:\/\/www.etotheipiplusone.net\/?p=5360","title":{"rendered":"Operation IDIocracy: Oil Return and Bilge Pump"},"content":{"rendered":"\n

So one of the final big integration jobs to finish before I can go take Snekvan on a joyride is the oil return system coming from the two turbos. This is a more complex system than the usual setup of one turbo mounted up high near the exhaust manifold, because these both sit well below the engine oil sump level. They therefore can’t just gravity drain with a simple tube or riser\/pedestal. <\/p>\n\n\n\n

Instead, I picked up a small self-priming solenoid pump<\/a> and will have it sucking on the oil drain ports of the turbos, returning the oil up to the engine somewhere<\/em>. Before I get there, though, I had to route the oil lines themselves. <\/p>\n\n\n\n

In that “So What Now!?” post you can see some of the parts I sampled off the finest discarded leftovers from eBay Motorsports\u2122 such as oil fittings and whatnot. I found that #4 AN fittings were the most common plug n’ play system for oil feed lines, and so I ordered a few different lengths of pre-made braided lines. <\/p>\n\n\n

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The jumping off point for oil pressure is this cross-drilled gallery plug on the lower left (driver’s) side of the engine, right in front of the transmission adapter plate. Now, Nick Pisca is a little critical of the Banks style turbo kits<\/a> which use this location for the oil feed, but I think in my application having the feed line as low as possible will minimize the amount of oil that has to be gravitationally drained after shutdown. <\/p>\n\n\n\n

Notice here that i used a three-way tee fitting, a 1\/8″-NPT male to two #4AN. In retrospect, now that all this is over, I should have routed the right-hand side turbo’s oil feed not up and over the transmission (as it creates a long path that has to be cleared by the bilge pump after shutdown). However, in November of last year, I didn’t know this yet. Up and over the transmission instead of tucking this line under the bell housing made more sense. <\/p>\n\n\n

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I formulated what hoses and fittings I needed for the return lines and ordered them from Amazon, the universal provider of almost any strange tube\/hose fitting you can imagine. <\/p>\n\n\n

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Here’s the gist of the setup for doing the oil return. From right side to left side:<\/p>\n\n\n\n