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Ouch!

Discussion in 'Anything Airgun Related' started by Tazz, Feb 16, 2014.

  1. Tazz

    Tazz Engaging Member

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    Whilst I was at the range today i decided to Chrono my guns. It was my own chrono ( (Chrony Alpha), and because I had recently bought a new (second hand) rifle I thought it would be a good opportunity to give my other 2 their annual check.

    My new acquisition and my pcp were fine at 10.5 & 11.2 respectively. However my TX200, which I have owned for 6 years and has always been sub 12 on previous tests, came out at 13.5!!. I was using Air Arms Diablo pellets.

    I put another 10 pellets through it, this time using JSB Exacts and got a similar reading.

    I am at a loss as to why the power should have increased by more than 2 ft/lbs over the past 12 months? Any ideas?
     
  2. sharpsman

    sharpsman Big Poster

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    Probably the piston washer has sized itself through use and has become more efficient.
     
  3. mattyts

    mattyts Donator

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    As said above,the more it's used,the more things are going to wear and conform,making things run smoother & faster.
     
  4. Tazz

    Tazz Engaging Member

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    Thanks for the replies. If, as suggested, it's a case of components bedding in, I am left with the question, so what do I do to fix it, apart from replacing the spring/seals/washers?
     
  5. SteveO

    SteveO Top Poster

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    PM'd with advice to lower the power as per forum rules and etiquette.
     
  6. steve_lincs

    steve_lincs Busy Member

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    same happened to my hw80 after being stored, i banged half a tin of pellets through it, was testing after after every 50 shots or so and slowly power became stable and back to where it should be , mind you was stored for maybe 2 years,unused in gun cabinet...didnt seem to be deisaling, no smoke coming out of barrel..
    I just make sure i try and get it out for a few shots every now and then to keep it running nicely, all the best steve
     
  7. alb38

    alb38 Engaging Member

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    that's HW for you - reliability!:up:
     
  8. Dag

    Dag Pro Poster

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    Mmmmm!?
    Dag
     
  9. Tazz

    Tazz Engaging Member

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    And?
     
  10. Dag

    Dag Pro Poster

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    Hi, I wasn't trying to be sarcy or anything and was really questioning the annual checking of your rifles with a chrono. Perhaps I should have been more open and said IMO it seems too big a gap in ensuring your guns are legal. Following advice given on this forum I now check mine about once a fortnight. It all depends, I suppose, on how near your guns are to 12ftlbs and whether you feel confident that they would not have drifted above that legal level.
    Dag
    Edit: Going back to your first post: obviously the TX was considerably over the legal limit and could have been, I guess, for some considerable time.
     
    Last edited: Feb 18, 2014
  11. gasman

    gasman Up a bit,,,,,,,

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    if not use for some time, a build up of lube infront of piston could have caused it to diesel ,igniting lube/oil causing a small explosion propelling the pellet out at very high speed
     
  12. SteveO

    SteveO Top Poster

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    This used to happen to my HW99, after standing a while the first two shots were well into the 20's because of dieseling, I wasn't happy with that and changed to a PTFE lube called Ultimox that doesn't diesel, it now stays safely at just over 11fpe.

    Out of interest I wonder if the law would convict for FAC based on a few shots that went over due to dieseling?
     
  13. Tazz

    Tazz Engaging Member

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    Thanks for the clarification and i think you raise an interesting point. I was always advised to chrono my guns once a year, unless they had had work done on them or I noticed a significant change when shooting. Although I suppose the frequency you use a particular gun may influence how often it should checked. As for the TX, it was last checked in July, when I joined a new range and it averaged 11.1 (spread 10.8 - 11.3) which is the same as it had measured each since I bought it in 2007. There had been no noticeable change in its characteristics when shooting. I probably put about 100 pellets through it most weekends.
     
  14. Dag

    Dag Pro Poster

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    Interesting point Steve. Probably they would still prosecute as it would be up to the owner to prove dieselling had in fact occurred. Quite honestly with all they have to do I think they'd proceed with a prosecution first and leave you to appeal afterwards.
    Arguing that it was dieselling would no doubt get the response "Then you should have done something about it".
    Suggesting it might be dieselling could might be difficult to prove if the rifle had been confiscated.
    Being able to show a consistent record of testing with a chrono over a long period, eg in a little black book, might just convince them and/or a magistrate that it was an unfortunate incident but that you were a responsible gun owner.
    I think I'd prefer to rely on the last scenario.
    Dag
     
  15. Dag

    Dag Pro Poster

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    Hi Tazz, You are very welcome, I'd hate to think anyone was done for being over the 12ftlb when they already have a chrono.
    atb
    Dag
     

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