Shimming Of Front Oil Pressure Regulator?
04-05-2004, 03:50 PM
#22
Senior Member
Join Date: Dec 2003
Posts: 203
Originally Posted by mazdaspeed7' date='Apr 5 2004, 07:10 AM
Too bad its wrong. There are 2 oil paths after the front OPR. The first one goes to the front cover and to the oil cooler, back to the rear iron, to the rear OPR, to the oil filter, and then to the rear stationary gear. The second one goes through the front iron up to the dowel pin, where the turbo oil feed is on turbo cars, through the dowel pin on all, and to the oil passage in the rear housing that feeds the rear OPR and the oil filter. The more of a restriction the oil cooler poses, the less oil that flows through it. If your oil cooler clogs, and completely stops the flow, you will still have oil pressure at all engine bearings.
The path for oil flow is:
Pickup from the oil pan and pumped through the front cover, where the front regulator lies, to the oil cooler lines. Oil goes through the oil cooler and enters in the rear iron. Oil passes a Y, with one path leading to the OPR and the other leading up the rear iron to the oil filter housing. Oil reneters the engine through the oil filter housing after being filtered, and spilts again: one side of the Y flows through the rear iron to the rear stationary gear, which in turn enters the eccentric shaft and feeds the rear oil jet. The other part of the Y enters the engine upper dowels, which flows to the front iron. At the front iron, the stock turbo oil feed is taken. Oil flows down the front iron to the front stationary gear, with a small line taken off of this to lead to the metering oil pump, via a small path through the front cover. Oil again enters the eccentric shaft (if the thermal pellet is open), and oil is injected into the front rotor via the oil jets.
The oil path does NOT split after the front OPR. ALL pumped oil goes through the oil cooler and oil filter, and has a chance to be bled off via the rear OPR. OIl is fed to the front irno ONLY through the dowel pin.
Even the Haynes doagram will show that :P
04-05-2004, 04:06 PM
#23
Senior Member
Join Date: Dec 2003
Posts: 203
Here is a front iron.
Oil is picked up at E, pumped through the shown passage to A. The line associated with B is just a drilling passage; the oil passages were machined, not cast.
You can also see where the upper dowel enters the iron at C, and the flow path to the front stationary gears. D is another blocked drilling passage.
As you can see, there is no flow from the oil pump directly to the dowels, now would this makes sense.
Thus, if your oil cooler becomes a complete retriction, the engine bearings get ZERO oil.
Oil is picked up at E, pumped through the shown passage to A. The line associated with B is just a drilling passage; the oil passages were machined, not cast.
You can also see where the upper dowel enters the iron at C, and the flow path to the front stationary gears. D is another blocked drilling passage.
As you can see, there is no flow from the oil pump directly to the dowels, now would this makes sense.
Thus, if your oil cooler becomes a complete retriction, the engine bearings get ZERO oil.
04-06-2004, 01:05 AM
#26
Senior Member
Join Date: Dec 2003
Posts: 203
Originally Posted by Drago86' date='Apr 5 2004, 03:18 PM
so, shim or not shim?
04-06-2004, 01:59 AM
#27
Senior Member
Join Date: Oct 2003
Posts: 177
Hmrm it wouldn't be TOO hard to find pressure drops?
at least over the oil cooler is fairly easily.. get a spare banjo bolt, drill and tap the top of it and bobs your uncle you can measure the pressure drop!!
This gives me an idea.. when my motor is running I might do this.. Since I already have a drilled and tapped banjo bolt. (oil for turbo)
Finding the drops elsewhere in the system would quickly get a bit more trickey though...
at least over the oil cooler is fairly easily.. get a spare banjo bolt, drill and tap the top of it and bobs your uncle you can measure the pressure drop!!
This gives me an idea.. when my motor is running I might do this.. Since I already have a drilled and tapped banjo bolt. (oil for turbo)
Finding the drops elsewhere in the system would quickly get a bit more trickey though...
04-06-2004, 07:17 AM
#28
Senior Member
Join Date: Jun 2003
Posts: 406
I guess keeping the system with a close to stock ratio between front and rear regulators would make sense. Still though 80 psi of pressure drop in the factory system? or is the front regulator only there for emergencys or soemthing?