F355 Air Injection Pump | FerrariChat

F355 Air Injection Pump

Discussion in '348/355' started by conscom, Nov 8, 2008.

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  1. conscom

    conscom Formula Junior

    Jan 6, 2008
    467
    Vancouver BC Canada
    Full Name:
    Gary
    Does anyone know if the air injection pump can be repaired? I've checked that 12 volts is present at the connector but pump does not run.
    Thanks for any suggestions.
     
  2. jetfixr

    jetfixr Formula 3

    Jun 14, 2007
    1,016
    northeast
    Full Name:
    Gone
    Mine is failed too. I will report how I get this fixed...I'm working a solution:) Wish me luck
     
  3. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    33,736
    Austin TX
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    Brian Crall
    The failure mode is usually the cheap armature bushings go bad and increase load on the motor until it burns up. And then sometimes they just ingest water until they die. May not be much left to fix. They are really throw away quality.
     
  4. conscom

    conscom Formula Junior

    Jan 6, 2008
    467
    Vancouver BC Canada
    Full Name:
    Gary
    Do you have a part number for the SPAL air pump? Also, it looks quite awkward to re and re - so any tips to make the job easier? THX
     
  5. UConn Husky

    UConn Husky F1 Rookie

    Nov 11, 2006
    4,422
    CT
    Full Name:
    Jay
    mine failed by somehow welding the impeller to the housing - seems like some bearings got too loose allowing it to slide around. I couldn't find a good lower cost replacement (360 is too big) and ended up finding a used 355 pump that works great.
     
  6. Baptist

    Baptist Karting

    Mar 2, 2008
    78
    Is this pump just for emissions on cold start?
     
  7. cavlino

    cavlino Formula 3
    Silver Subscribed

    Mar 6, 2002
    1,737
    Ottawa, Canada
    Full Name:
    Carm Scaffidi
    It also works the bypass exhaust valve.
     
  8. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    33,736
    Austin TX
    Full Name:
    Brian Crall
    Nope. Vacuum does that.
     
    End Game likes this.
  9. cavlino

    cavlino Formula 3
    Silver Subscribed

    Mar 6, 2002
    1,737
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    Carm Scaffidi
    My Bad :(, thanks for correcting me :)
     
  10. fmaderi

    fmaderi Formula Junior

    May 8, 2005
    254
    clearwater Fla/NY
    Full Name:
    frank maderi
    emissions .
     
  11. lotusk

    lotusk Formula 3

    Nov 3, 2003
    1,840
    London UK
    that air pump does work the bypass valve
     
  12. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    17,913
    USA
  13. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    17,913
    USA
    How? It shuts off a couple minutes after a cold start.
     
  14. ferrari.ace

    ferrari.ace Karting

    May 25, 2006
    232
    So.Cal.
    Full Name:
    Adam Cox
    Like brian said, "Nope".

    It is for cold start emissions. It introduces air to the exhaust ports of the cold engine to help burn off excess HC until the engine reaches a prescribed temp, then it shuts off.

    I could see how some could be confused as the hard vacume line for the by-pass valve is welded to the hard air line for the air injection, making them appear to be related.
     
  15. cavlino

    cavlino Formula 3
    Silver Subscribed

    Mar 6, 2002
    1,737
    Ottawa, Canada
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    Carm Scaffidi
    This is why I thought it was related since they are on the same pipe :) Thanks for clarifying this.
     
  16. lotusk

    lotusk Formula 3

    Nov 3, 2003
    1,840
    London UK
    so how is the vacuum in the bypass valve created???
     
  17. cavlino

    cavlino Formula 3
    Silver Subscribed

    Mar 6, 2002
    1,737
    Ottawa, Canada
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    Carm Scaffidi
    Good question, I would be curious of that too :) Also would our exhaust manifolds last longer if we didn't let the air pump heat them up at start up?
     
  18. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
    Vegas+Alabama
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    Mr. Sideways
    Every mid-sized and large town has a magneto shop that can cheaply fix *any* electric motor that is even remotely repairable...and the same shops can rig a replacement motor otherwise.
     
  19. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    17,913
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    #19 f355spider, Nov 9, 2008
    Last edited: Nov 9, 2008
    You repeat these points, often. I would like to see you PROVE it. Take Coscom's air pump, and get it repaired for him. Having seen how these are built, and in Uconn's post how it failed, and based on Rifledriver's comments to the point, they really appear "disposable" in their construction. The design does not appear to lend itself to an easy cross reference either. So, please prove me wrong.
     
  20. gothspeed

    gothspeed F1 World Champ

    May 26, 2006
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    goth
    It is created when ever the throttle is closed with the engine running. There are two small plastic check valves aft of the left and right thottle stacks, they both lead to a coffee can sized vacuum reservoire. The vacuum is then allowed to open the exhaust bypass valve and plastic start up diaphram by way of two ECU actuated soleniod switches.
     
  21. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
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    Mr. Sideways
    #21 No Doubt, Nov 9, 2008
    Last edited by a moderator: Sep 7, 2017
    It's not controversial. Here's your picture of the 355 air pump, marked up to show how a magneto shop is going to view it. They aren't going to care if it goes on a Ferrari, boat, or tractor.

    They are going to unbolt the little electric motor. Either it can be rebuilt (e.g. new armature/brushes/bearings/etc.) or else it can be replaced.

    Probably the worst failure from their viewpoint would be an impellor that was jammed/welded into its assembly...and even then, they will either be able to repair or replace it in most cases.

    This is what magneto shops do. All day long. They fix failed electric motors/assemblies.
    Image Unavailable, Please Login
     
  22. 2NA

    2NA F1 World Champ
    Consultant Owner Professional Ferrari Technician

    Dec 29, 2006
    18,214
    Twin Cities
    Full Name:
    Tim Keseluk
    Go ahead, take it apart and look at what you've got.

    You'll probably end up throwing it in the trash.
     
  23. UConn Husky

    UConn Husky F1 Rookie

    Nov 11, 2006
    4,422
    CT
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    Jay
    I appreciate any DIY tips, but like anything you need to apply it to your situation. In my case, the impeller was welded SOLID. I had to pry it apart, both the housing and impeller were toast. If the impeller is good and it's motor only, absolutely go for a rebuild. I think a new one was $750+??
     
  24. lotusk

    lotusk Formula 3

    Nov 3, 2003
    1,840
    London UK
    gothspeed.thanks for the vacuum post
     
  25. Loser

    Loser Formula Junior

    Apr 11, 2008
    791
    Gilroy, CA
    Full Name:
    Tom
    Hmmm, so I wonder if I could rig a switch under the dash to trigger the exhaust bypass valve solenoid manually (with some sort of protection circuit or diode to protect the ECU output of course). Then I could override the ECU control to have the bypass valve engaged at all RPMS whenever I wanted, then have it run normally again at a flick of a switch. I saw this feature on a Lambo once. Maybe I'll look into it some and start a new thread.
     

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