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Crank Pressure

DIY PCV Vented Catch Can with a 1/2 Barb.

From my experience VQ35’s tend to have excess crank pressure. Think about it, how many 3.5’s do you hear about that are constantly knocking even with 93 octane fuel and nearly stock with little to no modifications. Part reason is because the inside of intake manifold is coated with oil that comes from the valve cover. Oil in the combustion reduces octane and causes buildup. Why are there so many 3.5’s that leak oil; there are even jokes and meme’s about it. Well, to understand let me take the opportunity and go over the PCV system and solutions.  ...  Continue Reading