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lgu problem

Discussion in 'Anything Airgun Related' started by gordy p, Jun 16, 2015.

  1. gordy p

    gordy p Busy Member

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    Lets try and rephrase this to keep within forum rules.
    my lgu is down on power 9.6 I have read this could be the tp size. has anyone else had this problem and if so how did you cure it?
     
  2. neil180

    neil180 Busy Member

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    I have not had this problem, but read about it elsewhere. I decided to take action before it happened as I heard that the springs could be knackered by this - so while my gun was with Paul SHort for the fitting of one of his shrouds and some guides, I asked him to drill the port out to 3.1. When it came back I had a slightly improved shot cycle and a gun that was on the limit - so I had to calm it down a little.
    I have now sent the comp tube / piston off to NickG for some of his care and attention where I suspect the TP will be opened up to 3.6 in the process.
     
  3. gordy p

    gordy p Busy Member

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    Thanks neil is that on a 177? I have read 3.2 is about right but cant find out if its the same for 177 and 22
     
  4. brucegill

    brucegill Engaging Member

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    start small and go up in increments. You'll only know whats right for .22/.177 by testing with light, medium and heavy pellets.
    By the sounds of it, you could go to 3.1/3.2 and you'll be about right. Don't forget to de-bur the inside and outside of the TP though
     
  5. bigtoe

    bigtoe Donator

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    3.4 to 3.6mm is needed for .177, you can get away with smaller for .22.

    a TX has a 3.8mm port right from the factory...ever wondered why?
     
  6. brucegill

    brucegill Engaging Member

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    Hi Tony

    can you give me the other figures? TP length, diameter, stroke? I've not added these to my spreadsheet (Jesus, that's too geeky lol)
     
  7. bigtoe

    bigtoe Donator

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    Bruce

    an LGU has a 2.6mm x 6mm port, its basically German 7.5j spec with a big spring behind it for the UK, the spring fatigues really fast and the guns lose power.

    easy mod with the stock piston in .177 is 3.2mm port.
    if you lighten the piston to 200g 3.4 to 3.6mm port

    for a .22 its less, stock piston 3mm port
    lightened piston 200g 3.2mm port

    I run a 170g piston in mine now with a 3.6mm port, stock stroke 88mm and oem seal, if i converted to O ring nose i would run 3.4mm port 88mm stroke...3.3mm at 80mm stroke.

    Please post the spread sheet over here too ;)
     
  8. brucegill

    brucegill Engaging Member

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    Top man. Thanks. Will do but buggered if I can from my phone lol.
     
  9. gordy p

    gordy p Busy Member

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    Brilliant thanks I apretiate it
     
  10. gordy p

    gordy p Busy Member

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    Right I have taken the tp out to 3.2 and the result is a gun exactly the same as before lol. same power and if there's a diference in shot cycle I cant tell the diference
     
  11. landymick

    landymick Keyboard Hero

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    First off check the chrono is working correctly & correct pellet weight,i'm sure you already have.Then try another spring or add some preload to your existing spring to see if any improvement .Was it full power at first then came down?
    On mine at the moment it has not changed though its only had 2000 through it so far & is totally standard.
     
  12. gordy p

    gordy p Busy Member

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    Yep crono is fine and correct pellet weight. As for has it dropped power I dont know as I got it second hand. I will try a little preload im goingto get it right the gun is awsome. And dont tell my tx200 but I dont think it's going to get used anymore lol
     
  13. landymick

    landymick Keyboard Hero

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    AA Field work well & RWS super field have decent results but open up a bit after 35 yards compared to the AA.If its not a spring problem it may need a new seal when buying used rifles a bit of work is needed more often than not.:)
     
  14. gordy p

    gordy p Busy Member

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    This is what I think is happening with these guns judging by the amount of grease in them. I think they are being tested at the factory whilst dieseling and being set close to the limit. And once around 1000 pellets have been put through them and the grease burned off the power obviously drops off. I could be wrong but it makes sense to me lol
     
  15. gordy p

    gordy p Busy Member

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    It would also explain why some guns are loosing power and some not depending if it was dieseling at the time of test
     
    Last edited: Jun 16, 2015
  16. paulairgun

    paulairgun Keyboard Hero

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    Try Nickg on here. He's developed a piston tune up and a trigger job for the LGU. I shot one of his tx200's he'd worked on at a local club and it was awesome. Very smooth and far more accurate than a standard rifle.
     
  17. gordy p

    gordy p Busy Member

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    To be honest mate I dont really see the point of having it tuned. how much more accurate do you want than 5 pence size groups at 45 yards with very little recoil. And now I have put another 40 shots through it the power has come up to 10.6 so im happy now
     
  18. gordy p

    gordy p Busy Member

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    O and my crono testing has been done with 8.3 rws superdomes
     
  19. bigtoe

    bigtoe Donator

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    when reworking guns you have to remove parts, this disturbs grease etc. If you want uber consistency strip after strip the way to go is O ring piston seal...i have swapped 5 o rings out testing and every one when lubed gave exactly the same power ;)

    the key when testing is shoot it before you judge it, especially with a stock seal...30 to 50 pellets, then some speed tests etc.

    The stock seal on the LGU is very tough, unless you have severely damaged it which you would see there is no reason to test it, Umarex tested the seals to well over 100k rounds put thru them and they had very little wear.
     
  20. bigtoe

    bigtoe Donator

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    the springs fatigue mainly, mine lost 5mm in length over a 1.5 tins of exacts..
     

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