I'm not the most technically minded person when it comes to these things, so hear me out.
Just been wondering lately a couple of things;
As far as I'm aware the RB25 is a relatively high compression engine. I would imagine that this would result in a relatively high crankcase pressure - and naturally I assume that the engine would have been designed to handle that. However how have people had it perform in this regard when modified? Naturally a good oil cooler and oil catch can would be imperative for race applications on any engine, but my specific query is towards the design of the RB25's (& silvertop RB20's, and I'm sure other engine's) standard Pressure Control Valve setup: What appears to be two PCV's, one on each rocker cover, plumbed together.
If I am correct, then I would assume that the PCV's would be at optimal performance if each valve's release was independent of the other, but I haven't ever seen this to be the case. As it stands there is surely some restriction and/or turbulence in the current system, but is flow even important for this type of pressure release? If so, each valve could run into their own oil catch can before being plumbed into the intake or released to the atmo. Wouldn't this be ideal? Or am I not fully understanding how these things work... Plumbed together seems somewhat like a bandaid fix...
My reasoning is that if enough air pressure was released from valve one, it would impact on the rate of air pressure released from valve two as the air was forced past it.
Would there then be further benefit in drilling out the existing PCV location and installing a higher flowing PCV?
Cheers
- Mike