460 factory block oil line plumbing for turbos

just curious were you guys would consider running the oil feed lines for a set of turbos . just planning my system out .

maverick172 wrote:just curious were you guys would consider running the oil feed lines for a set of turbos . just planning my system out .

That depends a lot upon the block being used with whatever modifications it has.

I used the front port by the fuel pump on the 73 F100 but on the 98GT, I used the top port at the back.

no oil mods done to block . dove block .

rmcomprandy wrote:

maverick172 wrote:just curious were you guys would consider running the oil feed lines for a set of turbos . just planning my system out .

That depends a lot upon the block being used with whatever modifications it has.

BigBlockRanger wrote:I used the front port by the fuel pump on the 73 F100 but on the 98GT, I used the top port at the back.  

ya i was looking at the oil plug by the fuel pump i think i will use that run a tea and run 2 seperate lines to the turbo.s i was thinking of useing the fuel pump blockoff plate and welding a oil drain plug in there and draining both turbo's into there than i dont need to cut my oil pan up .

I considered returning to the fp area on the truck, but it was too high to be a good gravity return.

Adding an oil pan return is not a big deal. I usually drill a small hole and use a tapered punch to open it up, then run a pipe tap in. Screw in a fitting, add a little RTV and it's good to go.

thats interesting never thought just tapering some sheet metal pan would hold i was just going to tig weld a bung onto the pan if i go return in the oil pan

BigBlockRanger wrote:I considered returning to the fp area on the truck, but it was too high to be a good gravity return.

Adding an oil pan return is not a big deal.  I usually drill a small hole and use a tapered punch to open it up, then run a pipe tap in. Screw in a fitting, add a little RTV and it's good to go.

maverick172 wrote:just curious where you guys would consider running the oil feed lines for a set of turbos...

As a matter of basic practice with the passenger car blocks, I've always preferred to tap into the rear pressure port rather than the front pressure port...in other words, tap into the BBF's oiling system after it has performed the duties it is intended to do.

This is not an exact way to interpret a dynamically active, pressurized oiling system (too long to type), but in general terms I am just not keen to diverting oil out of the cylinder block before it has navigated all the passages to the bearings, the lifters, etc, that it is supposed to keep lubricated.  Instead, let the oiling system do what it is intended to do, and then tap into the remainder or "reserve oil" that is readily available at the end of the line (rear pressure port).

As always there are exceptions....but based on what you asked that's how I would plumb it.

Something to remember: Ball bearing turbos typically use a restricted feed and therefore require a lower volume of oil than a journal bearing turbo needs.

Tapping the pan:

[quote="BigBlockRanger"]Something to remember: Ball bearing turbos typically use a restricted feed and therefore require a lower volume of oil than a journal bearing turbo needs.
do you use a oil restrictor for journal bearing turbos as the ones i am running are twin 88 but they are journal bearing

No. Do not restrict a journal bearing unless you like bar-b-qued turbo bearings. Just an open -4 line is fine.

Pay attention to the adapter you put on the turbo. The one I bought for the GT45 we had on the 302 had a teeny tiny hole. It would have cooked the turbo in no time flat. i drilled it out and it has been fine.

good to know
thanks

BigBlockRanger wrote:No. Do not restrict a journal bearing unless you like bar-b-qued turbo bearings. Just an open -4 line is fine.

Pay attention to the adapter you put on the turbo.  The one I bought for the GT45 we had on the 302 had a teeny tiny hole.  It would have cooked the turbo in no time flat.  i drilled it out and it has been fine.