HalcyonS, It isn't quite that simple, but I cannot answer it for you completely. Some areas of the crankcase like the valves, it just splashes around, and apparently having the cover off does not affect oil pressure, and I guess the unpressurized oil trickles down there.
Someone else that has torn one apart in detail will have to explain further. I think that maybe the crankcase itself is pressurized, so that oil gets pressure fed into the cylinder walls and crankshaft/camshaft, etc. The Indigo system gets its feed from the OEM oil pressure sender 1/8" NPT hole and then is fed back in via the 3/4" hole just under the fuel pump. Older versions had a pickup tube (which in theory are great for pulling oil out for oil changes, but the newer ones do not...it just dumps in based on the newer diagrams.) I have the older style, but I still pull my 3-ish quarts out of the dip stick hole, because I am too lazy to engineer anything better.
So, if I understand correctly, the pressure valve in the older Indigo system up near the filter is likely a relief valve, and it keeps the crankcase pressurized and any extra/bleed off it lets into the oil filter, which in turn dumps into the sump. The Indigo kit comes with a couple of parts to bottom out (maximize) the pressure at the OEM oil pressure regulating valve in the engine block.
Someone else that has torn one apart in detail will have to explain further. I think that maybe the crankcase itself is pressurized, so that oil gets pressure fed into the cylinder walls and crankshaft/camshaft, etc. The Indigo system gets its feed from the OEM oil pressure sender 1/8" NPT hole and then is fed back in via the 3/4" hole just under the fuel pump. Older versions had a pickup tube (which in theory are great for pulling oil out for oil changes, but the newer ones do not...it just dumps in based on the newer diagrams.) I have the older style, but I still pull my 3-ish quarts out of the dip stick hole, because I am too lazy to engineer anything better.
So, if I understand correctly, the pressure valve in the older Indigo system up near the filter is likely a relief valve, and it keeps the crankcase pressurized and any extra/bleed off it lets into the oil filter, which in turn dumps into the sump. The Indigo kit comes with a couple of parts to bottom out (maximize) the pressure at the OEM oil pressure regulating valve in the engine block.
Comment