Yes that will work- you will have a totally passive crankcase ventilation system like in the old days before PCV (positive crankcase ventilation) as a hot rodder from the 60's and 70's I know it works- you just need to make sure the engine can vent pressure in and out so you don't pressurise the bottom end as it will create parasitic HP loss and possibly blow oil out. I have found it best to limit air into the motor and have easy blow out. A catch can and a checkvalve is HIGHLY recommended on any application- street cars these days just throw it back into the intake system. On a turbo or super charger motor you DO NOT want to pressuize the bottom end. Piston ring sealing has nothing to do with the spring pressure of the rings- it is the combustion gas over the piston that seals the rings- therefore anything you can do to decrease pressure in the crankcase/motor is essential. You will therefore increase ring sealing, decrease parasitic motor drag and oil loss. The diagram at the beginning of this thread makes the most sense to me, esp. on a boosted car. The PCV will not hold boost, you will then pressurize the bottom and blow oil/foam out the valve cover into the intake system. You could of course put a catch can there and collect it (NOT!). Makes no sense. A check valve that doesn't allow pressurizing of the crankcase will stop that. You still need to vent the top of the motor- valve cover/ top driver's to allow venting to atmosphere to not pressurize the motor. There are more sophisticated ways to do this with race motors, but this is a viable way to do this- by the way, my catch can is not getting oil and I do not have to add oil like I did before I did this. pm me if you have questions. Dr. MIke
Last edited by MDRACER : 08-18-2006 at 08:11 PM.
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