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Question HW80

Discussion in 'Anything Airgun Related' started by jasey71, Jun 25, 2014.

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  1. jasey71

    jasey71 Newbie

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    Just fitted a titan xs and a venom piston seal to my hw80, Now it's as loud as a rim-fire!!! Any clues boys?? And girls of course!
     
  2. Meteor62

    Meteor62 Major Poster

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    Did you re lube or was it seal and spring change? Sounds like the wrong lube has got in front of the piston causing dieselling. Is there any smoke or smell? As it's a hw80 you need to be checking any changes on a chrono to stay legal.
     
  3. larryking28

    larryking28 Busy Member

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    Sounds to me like the spring has just been put in as it is.
    Springs are normally made to suit more than one rifle otherwise it would cost more to make each one if they had to make the right size spring for each rifle on the market.
    Normally you would fit the spring,check the power and then cut the spring to suit.
    This process may take 2-3 attempts to get right and you need to chrono it (check power) each time to see what the rifle is doing.
    Also if you have just changed the spring and seal without doing anything else such as degreasing the internals you probably have a bunch of grease/oil in the rifle in front of the piston seal.
    When the air compresses when the rifle is fired the compression can ignite this grease/oil in front of it and can add to the overall power of the rifle.
     
  4. jasey71

    jasey71 Newbie

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    I de-greased,and wet and dried it internally,chopped 1" of it a bit of bisley grease on the piston and inside,it's a smooth cocking action,no smell or smoke,just a loud crack! also I changed pellet to h& n pest control???
     
  5. larryking28

    larryking28 Busy Member

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    But do you know what power it is putting out?
    By degreasing it doing the wet and dry and fitting a new piston seal you could have upped the power without realising even though you have cut the spring.
     
    Last edited: Jun 25, 2014
  6. 177

    177 Donator

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    Did you shorten the Titan mainspring ?

    Last one I dropped into an 80 (without doing any other work on the gun) was pushing 16 FPE. It shot loud as hell, was harder to cock, and had a nasty firing cycle.

    Get the gun over a chrono and then start looking at dropping a coil or two off when you find out what it's pushing out.
     
  7. Trampilot

    Trampilot Keyboard Hero

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    Sounds (no pun intended) like it may be over the limit, but also did you also change the spring guide. I found using a good fitting nylon/delrin spring guide and top hat can reduce the noise and recoil.
     
  8. Tadpole

    Tadpole Super Moderator Staff Member Mod/Admin

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    This is your main concern & needs to be investigated, this thread is closed as we are talking of 'power adjustment' pm's from now on guys ;)
     
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