Crank case Breathers | The Z Club of Great Britain
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Crank case Breathers

Discussion in 'S30 (240Z,260Z,280Z) Engine' started by Turn & Burn, Jun 13, 2019.

  1. Turn & Burn

    Turn & Burn
    Z Club Member

    Hi, I’m wondering what people with triples or ITBs are doing with regards to crank case vents.
    I’m considering running a line off both the block and cam cover to a common catch pot with a filtered inlet. There doesn’t seem to be any easy way to extract fume with sufficient flow as per the original design with extract on the manifold and inlet breather on the air filter.
  2. johnymd

    Z Club Member

    I think most people just don't consider how the crankcase ventilation system is designed to work and its purpose. So they just put a filter on the rocker cover and point the bottom hose down. This wont provide sufficient airflow through the crankcase as intended but if you if you orientate the bottom pipe to act as a venturi with air passing across it then maybe it will draw a bit of airflow through the crankcase.
  3. Turn & Burn

    Turn & Burn
    Z Club Member

    Is this what u do with urs?
  4. johnymd

    Z Club Member

    I hadn't actually got around to doing anything on the new silver project. Left both the top breather and the block breather open. Nothing ever comes out of the top but I had a fair bit of oil droplets all over the engine bay after the track session at Spa. My plan is to have a small filter on the rocker cover so clean air can enter the engine. Run the bottom crankcase vent to a catch can then and outlet from the top of the can to under the car, in airflow to try and create a negative pressure in the can.
    Turn & Burn likes this.
  5. jonbills

    ZClub Administrator
    Staff Member Moderator

    I just have it vent into a catch tank (old 1L oil bottle!) with a little filter on top.
    No road draught stuff. Nothing seems to go wrong. Very little goes in the catch tank.
    Turn & Burn and moggy240 like this.
  6. SacCyclone

    Z Club Member

  7. Turn & Burn

    Turn & Burn
    Z Club Member

    Thanks all!

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