BDC

I bet they're removing the plug in the oil galley that's already machined in the front iron housing, installing an A/N adaptor fitting, then running a -4 or larger oil line straight there. If you study it (the front iron housing) closely, you'll see that it's 90 degrees perpendicular 'south' to the oil galley that's drilled from the top down where the factory turbo oil line's banjo bolt resides. Take a peek at it.



This is a subject that I've been diving into heavily lately. One idea I've got is to bypass the upper tubular dowel pin(s) oil galley all together, fill in the rear iron housing at the bottom depth of the back dowel pin, use no dowel pin o-rings, and run two lines from the oil filter pedestal around the block to both the turbocharger and the front gear bearing. From what I understand, the oil in that upper dowel pin oil galley gets VERY hot, heat soaks the dowel pins, the rotor housings, the coolant jackets in the immediate vicinity, and the intake charge at about ~40BTDC during compression. In theory, by bypassing it all together, you're helping to reduce oil temperatures, coolant temperatures, as well as charge temperatures. It will also theoretically lubricate the front gear bearing more adequately and evenly with respect to its rear gear bearing counterpart (where the oil temperatures are theoretically the same instead of the front bearing being a measured degrees hotter). It's worth a try definitely. I'll be doing this on mine when I tear into it.



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rotarypower101

While looking for another thread this one came up so I thought I would get a update from anybody that has done this, and see how its working for you.



You are right in all your assumptions BDC. Have you been working on any other oil mods than the ones that have been discussed?

BDC

Nope, but I have been studying this one fairly intently. I've got my own engine apart and will probably do it to that one. From what I understand, m ostly from the help of Lynn Hanover, the plug that's pressed in the oil gallery needs to be drilled out (engine has to be apart; don't try this with an engine together and running ) and then tapped for a -10AN fitting/adaptor. I'mn not sure if this is a good size or not as it seems pretty large to me. I was initially thinking -6 but I trust Lynn's judgment. In any case, the point to draw it from would be from the oil filter area. I'm using a Racing Beat oil filter stand block that has two outlets for oil pressure and oil temperature. I'm using one of them for oil temp but not the other as it's plugged. I will probably use that if I can find an adaptor for it.



I'm going to try and put this together within the next few days. Hopefully, my camera will magically start working again or I can use another one to take some pictures of how it's done.



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rotarypower101

pineapple uses a 1/4 to -6 for the loop line fitting on the block.

BDC

That's what I needed to know. Thank you. I'm going to build one today for mine... we'll see what happens.



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BDC

I purchased the necessary hardware today to make this loop line modification:



- 1/4" NPT to -6AN adaptor for the front iron housing

- 3/8" NPT to -6AN adaptor for my Racing Beat oil pressure/oil temperature block

(running a 3/8" 3-way block tee from the RB block for the oil temperature sending unit and the adaptor for the loop line)

- 3 feet of -6AN line



All I need to do now is drill out the plug and tap the front iron housing's oil gallery for 1/4" NPT thread and get the proper length hose constructed. I'll post pictures once I'm done.



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rotarypower101

here are some better pics for those that wish to do this

rotarypower101

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rotarypower101

And just as a side note, this mod creates a conflict with the accessory plate for the PS and AC. It can be overcome by cutting a slot for a 90deg fitting into the plate. It should fit properly with no washers under the compressor or maybe 1 or 2 if not tapped all the way in on the block. And don’t start with that throw out the AC ****! I live in Oregon its usually cold and wet here 346 days of the year and I still want my AC on those rare warm days.