Can't figure this out, check out video

Discussion in '308/328' started by Barnone 308, Mar 15, 2018.

  1. Barnone 308

    Barnone 308 Formula Junior

    Mar 22, 2004
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  3. Steve King

    Steve King F1 Rookie

    Feb 15, 2001
    Booster is leaking or the check valve is bad. Pull and plug the booster line and see what you have.
  4. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    Full Name:
    Steve Magnusson
    Are you saying:

    1. The barrel for cyl #4 is wrongly drawing ~18 kg/hr at idle, and the barrel for cyl #3 is also at the same wrong 18 kg/hr,
    2. The barrel for cyl #4 is wrongly drawing ~18 kg/hr at idle, but the barrel for cyl #3 is at the correct ~3.5 kg/hr?

    (what video?)
  5. yelcab

    yelcab F1 World Champ

    Nov 29, 2001
    San Carlos, CA
    Full Name:
    Mitchell Le
    That would be a good test.
  6. jmaienza

    jmaienza Formula Junior
    Silver Subscribed

    Jan 8, 2009
    Full Name:
    A couple of things.

    1. Pull the check valve and check air flow. It should only allow air to go through in one direction, (from the engine to the brake booster line). I also assume you have no problems with your brakes...plenty of boost.

    2. I noticed you are using two carb meters. Reverse them and make sure one is not faulty.

    3. Are the front carbs running about 3.5 kg/hr also?

    4. I assume the 2 air correction screws on the problem carb are properly set, (both closed or only one partially open).

    5. I assume you have properly balanced the front bank, left and right carbs with each other with the adjusting screw.

    6. Did you check for a vacuum leak at the carb base and manifold? Also the lead balls that plug the holes had been know to loosen or even come out.

    7. Is this a new condition for your engine? Any work done prior to this?
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