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Tune HW90

Discussion in 'Anything Airgun Related' started by wattylad, Jan 31, 2009.

  1. wattylad

    wattylad Newbie

    Likes Received:
    Lookin to tune a HW90,I know they're sealed units but is there anything that can be done to smooth them out,don't get me wrong the gun shoots well but it's a heavy old cannon:mad:.I've had 80's:) and 77's:) b4 but the 90 seems ruffer or is it cos I've went pre-charged? and gettin soft? Lookin forward to sum replys,Cheers
  2. hw90hw90

    hw90hw90 Member

    Likes Received:
    Tuning HW90


    I've seen blogs about filling the airgun with different gases as a way to tune it.

    Air is made of
    Nitrogen 78%
    Oxygen 21%
    the remaining gases add up to the last 1%
    Putting Nitrogen only in the HW90 may work, but the effect on the Vitron seals or similar is not widely published.

    There are articles out there about what you can put into a HW90 in the theory that it improves the performance.

    See this

    see http://www.pyramydair.com/blog/2008/01/can-nitrogen-be-used-in-pcps.html


    But there is a case for removing impurities in air fills. Some pumps come with a filter.


    The HW90 seems to have technical constraints as to its performance at higher pressures. When I want to shoot in the back yard and hit plum sized objects at 30m I set it to 12bar. When I want to kill rabbits up to 20bar.


    I'd be interested to know what types of lubrication is used in the Weihrauch factory. So when replacing piston seals its important not to overdo the lubrication.


    60-70% moly black and white types are the most common types.

    Hope this helps. I am writing this off the top of my head. OVERALL keep the gun stock and you will be doing both you and the gun a favour.

    Last edited: Mar 24, 2009
  3. simply james

    simply james Banned

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    Cloud 9
    i find that interesting mate
  4. noluv6

    noluv6 Engaging Member

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    Very informative indeed.
    I have the lightning,friend has one gas rammed and mine is smoother.
    If you can set it at 10ft/ibs It would go smoother.
    If your's is a old moder you may have the older piston seal,but for that matter they may of never had the new seal put on.

    Las year theoben come up with a new piston seal and help's with pison bounce so worth a email to them.

    As for greases,I doubt the will help and post tuner's polish the air chamber and internal's with springer's,grease help's springer as they have a spring,the rammer being a sealed unit pluss gas don't need grease even though the pison seal may need a little.

    If it shoot's consistently,leave it alone,if it kick's to hard realease gas till your at 10ft/ibs which i also recommend for springer's.

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