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Message: [QUOTE="tbolt, post: 75969, member: 1878"] If you goal is HP & higher rpm scavenging the pressure out of the crankcase relieves the pressure from the pistons on the downstroke. At higher rpm the gasses will build and the crank case will become pressurized. Those large pistons are acting like an air compressor building pressure in the crank case. The oem setup scavenges the gasses out. The common ccv mod is useless in my book. I took my boots off and there was a very small amount of oil in it and that was the first time in 148K that they have been removed. Now this is only my opinion and exp with 40+ yrs of building engines. Granted, I don't have that much with these PSD's but the principal is the same. Ya'll do what you want. I'm just offering an opinion. On the old commercial diesels and equip engines you are not seeing the rpm we see on these modern modded engines. The old ones probably didn't care and you would see no gain from it. 2250 or so was about max on those. My tunes defuel at about 3800, a little more. I would think an eng with the common ccv mod will have more blowby at the oil fill than a stocker. [/QUOTE]

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