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2G Oil Catch can questions

Posted by Allen2g, Mar 11, 2019

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  1. EVLGSX

    EVLGSX Proven Member

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    Joined Dec 7, 2017
    Wallingford, Connecticut
    Why would crankcase preassure not be properly evacuated under normal driving conditions as well as the stock setup? Not sure if I understand but would like to hear whatever you've got on that.
     

    Street Build 839  15

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  2. ThunderChild

    ThunderChild Previously tametalon92

    1,702
    377
    Joined Jan 5, 2012
    Rathdrum, Idaho
    You have zero pull on the crank case with a vented can only, you will have at least a small amount of pressure present. Where as if you had a sealed can running to either the intake, IM or both, you have something to draw vacuum and relieve pressure at all times. The idea is to pull pressure and create a small amount of vacuum in the CC. Depending on the setup, line size etc. You may not be able to get to an actual vacuum reading, but I'd be willing to bet you'd get lower than any vented can setup.

    no matter how nice or large lined a vented can is, you won't be remotely close to vacuum being pulled in a DD if that's the only CC relief you have.

    Some form of active pumping is better than none imho, unless you're car is full race, full send the 10-15 times it runs every year, as you have other considerations to make for the car when used in that fashion.
     

    Street Build 294  7

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM

    Street Build 541  1

    1992 Eagle Talon TSi AWD
    manual · 1G DSM

    Street Build 1K  10

    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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