Quote:
Originally Posted by bishopts
So looking around for MM pcv diagrams to try and understand how they are routing the system, it looks like there are 2 different methods. One leaves the stock pcv valve in place and one moves the pcv valve into the can itself. I know most of you guys dont really know how pcv actually works of even did the work on your own car. But someone that actually did, could you elaborate on the two different designs. Is it forced air gets one and N/A gets the other? Or does it come down to flow volume needs?
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Believe it's related to flow volume, or the power you're making. I have the mild with road course top which eliminates the top filter/breather and replaces it with a line that runs under the car. The road course top only works with the mild system and was told directly by MM should be good to 900 crank hp. This mild system replaces the stock pcv valve with their own which has a -6an line coming off it to the can. Then a line which runs to the throttle body I believe for vacuum, and a drain line coming off the bottom. Mine also has a line coming off the top with the road course top which runs to the bottom of the car with a little catch I made. The can has its own check valve like Josh said, so it runs back to the intake in most circumstances until pressure exceeds the check valve then vents out my line from the top, or filter in other setups. The road course top prevents oil from shooting out the filter on top if pressure got crazy and instead it would evacuate out the line going to the bottom into my catch. I've also replaced the stock line going from the stock air/oil separator to the intake with a -12an line I believe it is to help relieve crank case pressure as well.