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I'm wondering about the oil return line in a turbo setup. Is there only one line connecting the turbo to the oil pan? How is flow maintained? I would think that there need to be two lines. I guess oil return line and oil feed line? Where on the oil pan should the lines be? Where should I drill the hole(s)?
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On a turbo setup you need an oil feed and an oil return. Normally the oil feed is from a connector on the block that is filled with pressurized oil (most kits get the oil by installing a tee on the oil gauge sender). The return line is usually a pipe bung welded onto the oil pan.
Hmm... Yeah, I read some of that here: faq.page
How does the oil flow through the turbo though? Does the turbo itself suck it in? Does the fact that it's pressurized do this in and of itself? The principal of diffusion? I don't get what makes it flow if you connect it up like that? Also, what about the location on the oil pan? What makes an optimal location? The return line just flows oil back into the pan, so higher up rather than lower?
On most turbos, the bushing is surrounded by an area of oil. The location of the oil pressure sender has a large amount of pressure at that location. If we had a gauge, you could see that oil pressure can reach 80 PSI, so this would easily flow a steady stream of oil around the bushings and then it would be sent to the oil pan.
For the return, you drill and tap or weld a pipe bung onto the oil pan. These requires that you remove it. My buddy and I are doing an Integra and we decided to just buy an oil pan from Moroso. It is already drilled and tapped for all the lines, has better tray design, and increases capacity.
Yeah, I wish Moroso had one out for the D17's. Oh well. I see though, so the pressure is what moves the oil. Well, larger pressure at one end than the other. Yep yep. I get it now. Thanks. I was thinking that I'de have to invest in an oil pump to move that oil around. Good deal. So you think that an oil cooler in-line with the return line would be okay? Enough pressure there after the turbo to get that oil through? Probably, right?
I talked to the Moroso guys at the IAS and he showed me the prototype for our D17. So it might be a good idea to give them a call/email. Using their pan increases the oil volume, which would allow for the overall oil temp to be lower. Also, the pans have some good designs on the windage trays to help the oil pump stay full of oil.
A cooler is always a good idea. Anything you can do to lower the temp will aid in the overall life and power of a motor. The problem is cost. The easiest way is to go with a remote oil filter set up and mount a cooler in front of the radiator. But this adds to the cost a bit. Jackson racing was supposed to come out with a kit, but I don't know if they have our application yet.
I would not add the cooler for the turbo tank return line. This would add too much restriction to the line and decrease flow through the turbo. An oil system cooler would lower the whole engines oil temp.
This is pretty much why they have turbo timers. All a turbo timer does is keep the motor running for a brief time to allow the turbo to slow down (at idle speeds, it will slow down). This lets it cool down and prevents the oil inside the turbo from baking. Of course you could simply wait a couple of minutes after driving fast to allow the turbo to spool down on your own. The worst thing you could do is get the motor up to full boost (turbo spinning at max speed) then shutting off the oil supply.
Ooh! Moroso has a prototype out!? That's great. I guess I'll be waiting for it then. That is if it doesn't cost too much. Where would you place the oil cooler then? Do the remote filter thing and place it in-line with that? I think it wouldn't matter, but maybe you're right?
The Moroso pan will be most likely 300 dollars, but if you are going to all the trouble of a turbo, the extra oil will be helpful, plus you will have to take off your pan anyway to get it welded. With a new pan, it is almost a one day job.
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[hr]The fitting should be made as high up on the oil pan as possible. Since the oil drain works on gravity, the tap needs to be higher than the oil level in the pan.[hr]
