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  1. moonie223

    Estimating check valve cracking pressure

    Hydtools, I actually considered no spring for a while. The internal geometry of the brass fittings plus the fact that most of the time the catch can will be in partial vacuum and holding the ball in place. Looks like I was figuring wrong, I only need to know the springrate to calculate the...
  2. moonie223

    Estimating check valve cracking pressure

    The problem with using the stock PCV system like you describe is under power half of the vents in the block are closed. This does not work, the crankcase will pressurize. https://www.youtube.com/watch?time_continue=12&v=rsYK_PwlzHk Most people go ahead and drill out the ports in the oil catch...
  3. moonie223

    Estimating check valve cracking pressure

    Hello! I am trying to make a fast acting check valve for use in the PCV system in a car with a turbo. Normally only half of the crankcase breather vents are open to the air under power, as the PCV closes in absence of vacuum. This works fine for a stock car, but I have increased blowby with the...

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