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355 Air Injection System help

Discussion in '348/355' started by Shacklock, May 27, 2024.

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  1. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,673
    San Carlos, CA
    Full Name:
    Mitchell Le
    #26 yelcab, Jun 1, 2024
    Your psi is too low and it is not acceptable to leak it all in 10 minutes. Look for old hoses, broken bits. Do a vacuum test on each section to find what is causing the leak.
     
  2. Shacklock

    Shacklock Rookie

    Sep 18, 2023
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    Gary Shacklock
    #27 Shacklock, Jun 1, 2024
    Many thanks, will do. Any idea what psi reading I should be getting. Many of the hoses are just pushed on without any clamps so they could leak I guess
     
  3. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,673
    San Carlos, CA
    Full Name:
    Mitchell Le
    #28 yelcab, Jun 1, 2024
    15 psi. The valves actuate at about 10 psi so you need a little head room. By the way, the source of the vacuum is the engine with the cam timing done correctly. The vacuum is drawn in at the intake throttle bodies and those need to be adjusted correctly. The vacuum also feeds the dual fuel regulators so those also have to also behave.
     
  4. Shacklock

    Shacklock Rookie

    Sep 18, 2023
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    Gary Shacklock
    #29 Shacklock, Jun 1, 2024
    Cheers yelcab. The car just had a full engine out service so I hope it’s just one of the check valves that’s bad. The engine is running perfectly and idles the best it has in the 17 years I’ve owned it ,
    Is the 15 psi you mention at idle or after its build up via driving?
     
  5. taz355

    taz355 F1 Veteran
    Owner Silver Subscribed

    Feb 18, 2008
    6,059
    Indio Ca/ Alberta
    Full Name:
    Grant
    #30 taz355, Jun 5, 2024
    I suspect it’s not a check valve but a hose
     
  6. taz355

    taz355 F1 Veteran
    Owner Silver Subscribed

    Feb 18, 2008
    6,059
    Indio Ca/ Alberta
    Full Name:
    Grant
    #31 taz355, Jun 5, 2024
    Smoke check it from the]at connection near the back rhs
     
  7. Shacklock

    Shacklock Rookie

    Sep 18, 2023
    15
    Full Name:
    Gary Shacklock
    #32 Shacklock, Jun 6, 2024
    Yep, It looks like the hose that runs from the T piece to the vacuum can has been replaced with a slightly larger ID. It rotates freely on the T piece. I'm going to buy new hoses and check valves so its all fresh
     
    Qavion likes this.
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