Oil line plumbing advice

[bevans6]

I've asked this before but now I need to fish, as opposed to cutting bait...

My 8V71T project has three readily available oil line feed points.  Drivers side rear of the block, passenger side front and rear of the block.  There are five things that need to have an oil feed and I need to figure out what shares with what.

Compressor - was fed all by itself from the front (of the engine, not the bus) passenger side point.
Power steering pump gear drive - was fed by itself from the passenger side rear point.
Alternator - was fed from the pressure gauge manifold.  Fed from the drivers side  rear point.  Since the gauges use no oil it got all of the feed from that point.
Oil Pressure gauge manifold - shares with the Alternator.  Since the alternator is a higher flow user, it drops the oil pressure reading about 10 - 15 PSI.

Now I also have the turbo.

I have been thinking of running the turbo by itself from the line at the rear of the drivers side block, that previously fed the oil pressure manifold and the alternator.

I have been thinking of having the air compressor and the alternator share a line, but I have no idea what the actual volume/pressure requirements are for either.  The compressor is fed with a smaller 1/4" line, while the alternator was fed with a larger 3/8" line but with a .070" restrictor at the fitting.  My concern is if the alternator will consume enough oil that the air compressor is starved for pressure or volume.  I know that with my old setup, the OP was around 55 psi hot at speed, and the reading on the gauge was around 45 psi when I added the alternator.  Working backwards, that kind of suggests that the air compressor would see 45 psi if it shared with the alternator - but that doesn't take into account the flow requirement for the air compressor itself (pressure is basically volume of flow working against a  restriction).

I don't know where the best place to put the line to read oil pressure is.  Ideally it would be direct from the block with nothing else on it, but I don't have any spare outlets...

I appreciate any and all advice from people who have plumbed up turbo's on these things before! 

Cheers, Brian

[luvrbus]

Brian, the one I have here feeds from drivers side rear and the gear driven alternator share the same supply port this factory,you know that you can drill and tap the oil galley at front this is what we have to do some of the older 8v92's

good luck

[bevans6]

I was going to drill and tap the front of that galley, but it's hidden behind the MCI motor mount cradle, not enough room for a fitting I thought, plus I simply forgot to do it before I put the cradle back on...  There is a 3/4 pipe plug directly over the oil pressure inlet port from the oil cooler, I thought maybe I could pull a line from that for pressure reading, if it was connected to the main galley.  do you know what's behind that pipe plug?

Good news on sharing the alt feed with the turbo feed, if they did that stock that's good enough for me.

Brian

[luvrbus]

There is 3/4 plug on the right side that is oil just below the the engine heater plate, on the cooler side I never saw but the 2  a 1/4 in and 3/8 inch but yours could be different

good luck

[bevans6]

When all else fails read the instructions...  

On the off chance that there was an oil system diagram in the manual I looked and guess what - there is!  That 3/4 plug is the cover for the drilling that feeds oil from the cooler across to the main oil galley on the other side of the block.  I think I will leave it alone, it is in there pretty hard and I already broke a pipe plug off yesterday trying to take it out.

My current plan is to drill the oil cooler sandwich plate, for lack of a better term, and put a -3 fitting in to feed the pressure sensors.  They take zero volume so not an issue, and I will see the highest pressure which will make me feel better anyway.  On race engines I always like to read pressure at the end of the longest line, after everything is fed, but for this application it's not that important which pressure you read.  If it seems silly I'll just cap or plug the tap.

I broke the 1" pipe plug where the block heater goes in.  it's a 1/2" square drive and I was only using my little big wrench, the 18" long handle one, and half the plug just broke off.  So now I get to drill it out and hit it with a chisel for a while.  Oh well, the joys of monster truck engines...

Brian