No way to know for sure. My odo is at 49Km. Was the engine new when it went in, who knows. The CA registration tag says 1600cc (not definitive) but there's every possibility the PO put the "CB Performance 2L" in when he repainted it and had it reappolstered. Was that new? Who knows. Every possibility he could have swapped the 1600 out for a 2L he had laying around.
I got a VDO gauge in it today and it has 60 psi cold and 28 psi warm @ 2500rpm. And the sender seems to come on right at 3psi like it's supposed to.
My plan is to pull the bypass out, measure it, and replace it with either the new OEM spring and piston and the "high oil pressure" version, check them, switch to 20/50, check it, then replace the oil pump with the 26mm Schadek pump/remote filter I bought for it last summer. Hopefully one, or more, of those things will fix it.
If not, it's time for a rebuild. The good news is that it doesn't leak, smoke, knock or have low compression. The reason I went to talk to my buddy is to ask about the possibility of simply slapping a new set of bearings in it and doing a valve job and call it good provided, of course, everything is within spec. The next level would be putting new P/C in it, but I'd rather not.
More than that I think I'll just shop for a new motor. Kind of kicking myself that I sold my Manx project with the fresh motor, but I made out like a bandit in that deal so I can't complain.
@JMM (Michael) posted:The oil pressure control valve (#2 in diagram) is the valve that controls maximum pressure system pressure by dumping oil out of the high pressure circuit altogether and into the sump. The function of controlling max pressure is why it's at the end of the plumbing system, not the beginning of it.
I have a <70 single bypass case. (So no #2) According to the Internet, #1 performs both functions on a single bypass case, but I don't understand how that would work, based on the diagram in the OP.
ps: I don't have a stock oil cooler. I have a Type IV oil cooler in a repro Thing shroud. But, given the in/out is the same as a stock single bypass case, I don't see how that would affect oil pressure. Qty, sure. But not pressure.