Oil Pressure Diagrams and pressure measurements, Saw this on the Samba Options

[Joe Owensby]

I was browsing the samba, and saw this thread with some really good diagrams of the dual relief oil system. I am not sure if the measurements were from a type I or what, but it was really good to see a good diagram of the oil system with some actual pressure measurements for different engine conditions and temps. It would be interesting to see what comments you guys that are highly experienced with the type IV engines have. JoeO

http://www.thesamba.com/vw/forum/viewtopic.php?t=280293

[Joe Owensby]

From reviewing the diagram on the Samba, and the one here, the two systems appear to operate the same way. Only difference is the location of the final control valve. From what I see, if the system pressure is too high (for whatever reason), it will bypass the oil cooler- no matter what the oil temp is on both types. That said, it all depends on the actual pressure, which is a function of the effective pumping volume rate, bearing clearance, oil dispersed through lifters or wherever else there is to allow oil to pass through. The remainder of the oil has to go through the valves.

I wouldn't recommend anyone changing their oil system based solely on the samba article, but it did give some interesting facts. And, heaven forbid that anyone change their engine based on my comments here. I am just trying to stir up some discussion to help us all better understand the systems. What if the same thing did happen on the type IV? It would be really interesting to see some actual pressure measurements similar to this on a type IV. JoeO