FTP 900 question

Discussion in 'Air Arms' started by Archer50, Jan 18, 2019.

  1. Archer50

    Archer50 Member

    Joined:
    May 24, 2015
    Messages:
    93
    Location:
    Perth
    A friend of mine has just bought a second hand FTP 900. When we were trying it we noticed a strong blast of air from underneath the action in the general area of the power adjuster and firing valve. Since there is a foam block covering where the air comes out that looks original, I'm guessing it is not a fault, but I know very little about this model.

    We can't get in touch with the original owner at the moment, and can't find any reference to this on the Web: can anyone explain what causes it please? Or is it a fault....?

    Thanks

    Alan
     
  2. EV2UK

    EV2UK Active Member

    Joined:
    Feb 23, 2017
    Messages:
    118
    Location:
    Southampton. England
    Club:
    Southampton Buccaneers
    It's perfectly normal.

    It's a vent hole for the hammer, obvoisly if it didn't have a vent hole the hammer would build up pressure.

    Tony
     
    top gun phil and C.Eaton like this.
  3. retroruss

    retroruss New Member

    Joined:
    Feb 19, 2017
    Messages:
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    Location:
    sheffield
    Club:
    Redferns / Doncaster Air Range
    Alan
    The firing valve runs in a small plastic bush when this is worn air can get by and out of the hole where the foam is when fired . A small amount of air coming out is Normal as some of this is from the hammer coming forward. The bush is only a couple of quid but check the valve stem is nice and smooth if not fit a new one at the same time.

    Russ
     
    top gun phil likes this.
  4. hmangphilly

    hmangphilly Floppy Quick Phil

    Joined:
    Nov 5, 2013
    Messages:
    2,251
    Location:
    wimborne
    There will always be some air escapage down past the valve stem of a HP poppet valve.
    Walthers do it and it vents out of the saftey button .
    Steyrs do it and it fills the hammer and trigger chamber .

    This is highly probably where the black gunge comes from that gets on your hammers ( atomised lubricant )

    some regs actually use it as part of their design ( walther , anschutz ,isp )

    This was one of the first things i asked about on here when i got my walther .
    After a chat with the lovely Pete Dutton , i was satisfied that it was just how it is .

    I see some gun makers have tried to address the problem by fitting a seal to the stem ,but it seems counter intuitive to introduce drag into the system.
    I recall one rifle that was totally mucked up by having that seal on the stem
     
  5. Archer50

    Archer50 Member

    Joined:
    May 24, 2015
    Messages:
    93
    Location:
    Perth
    Thanks guys - makes sense now :)
     
  6. Evo

    Evo Scouser by Birth mfta shooter by choice

    Joined:
    Dec 9, 2015
    Messages:
    791
    Location:
    wirral uk
    Club:
    ByleyFTC, the Dib,Blackbrook
    yep its not a fault all ftp900,s do this buddy so dont worry its fine, the foam block is there for this reason
     

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