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Thread: HW 90 Pump & Adapter !

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  1. #1
    Join Date
    Nov 2005
    Location
    barton on humber
    Posts
    3,535

    HW 90 Pump & Adapter !

    Hi, I bought a HW90 a short while ago, It was making 9 Fpe,
    I was loaned a Theoben hose & pump by one of the forums " Gentlemen "

    He did mention that one of his Gas ram rifles he could only pump to 10 Fpe because of the effort required,
    Now the pump & the hose are not of the quality you would expect from
    Theoben ???? I never tried the Theoben pump.

    So I made this ( Sorry about the poor Pic )


    Its an adapter to fit the Stirrup pump, I started to pump it to 15 Bar, Tried still the same, A couple more Bar, Still the same, A little more, No change,
    I thought I would try 22 Bar ish, ( I say " ish " ) because the gauge on the pump is 0-250 Bar & difficult to add 1, or 2, more !
    And " Wow "

    You could feel the difference in cocking, But shooting it felt the same, Recoil & noise were the same ! ( It does have a moving Inertia weight to reduce recoil ) I read on one site its decribed as Semi-recoiless !
    The 80 doesn,t have one !

    By judicious tapping of the Schrader valve, I was able to release pressure & drop the output to 11.8 Fpe ( I just bet, Someone will come on & say thats too close, ) Maybe that will stop them .

    The stirrup pump required no effort at all, All connections were only finger tight, A very simple task,
    I was thinking I might make up a batch ( Gun to stirrup pump ) But I have to buy some parts to make them, What do you think ! Ged.
    Last edited by gedfinn 2; 09-09-2010 at 04:57 AM. Reason: spelling

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