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Advice theoben evo noise

Discussion in 'Anything Airgun Related' started by paul finlay, Jan 28, 2014.

  1. paul finlay

    paul finlay Banned

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    Hi lads , just got a evo in walnut 177 , its mint , but just put a few pellets through it and its very loud , its got a evo mod on it , but far more crack then a springer ie tx200 or how 97k , will it settle down on the noise , breech seal seems ok , but a very very faint possible gap in the mod body to mod /barrel holding piece , any help , cheers Paul
     
  2. The Robin

    The Robin Super Moderator Staff Member Mod/Admin

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    Hi Paul

    I've just taken a Evo mod off my lastest rapid because it's pants. I now have a long series one on and a lot better. Ukneil does baffles for the Evo you have or maybe get Matt off here to make you one :up:
     
  3. paul finlay

    paul finlay Banned

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    Hi , any other reasons , are the mods that bad , as it sounds like the noise when a springer is fired without a pellet , paul
     
  4. paul finlay

    paul finlay Banned

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    Hi , any one have contact number for UK Neil , cheers Paul
     
  5. The Robin

    The Robin Super Moderator Staff Member Mod/Admin

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  6. engraver

    engraver Keyboard Hero

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    Hi mate i doubt the best silencer will help the noise on a rammer, plus the evo mod works more of a cocking aid than a silencer.

    I would chrono the gun first as it may have a burnt out seal so people pump up the ram pressure to compensate for low power.

    The action is what you need to silence more than the muzzle.

    Its always better to start off with a new piston seal and adjust the ram pressure to suit, but remember its never going to be pcp quiet, but ive had a few smooth rammers.
     
  7. paul finlay

    paul finlay Banned

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    Hi mate , over corno its 11.2 , had no more then 50 pellets , intouched, just rreally loud , cheers Paul
     
  8. 177

    177 Donator

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    Not trying to be funny here but have you had the end of the moderator off ?

    My mate bought a Theoben Evolution a while ago and his made a heck of a racket - some clown (anagram for previous owner :rolleyes: ) had taken the mod apart and the internals were missing :rolleyes:

    If you have any o-rings of a suitable size you can use one to ensure a 'nip up' fit between the moderator and the barrel.
     
  9. paul finlay

    paul finlay Banned

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    Hi matev, next job , end cap to come off and play around , paul
     
  10. engraver

    engraver Keyboard Hero

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    Paul, I think I need to explain more about what I meant.

    This is just theory ok so Im not saying your gun is like this but this is what I mean.


    Imagine getting a totally standard Evolution from theoben if they were still available.

    you chrono it at say 11.2 ft ibs.

    Then imagine putting a burnt out piston seal in that very gun with the ram pressure the same, what would the power be like?

    Of course the burn out seal would make the power lower maybe 8 ftibs, so instead of a new seal some people just pump the Ram up so the gun makes 11.2 ft/ibs again.

    But in the process the action noise is louder because its gas ram is running at FAC pressures to power the gun enough with a knackered seal.


    I remember buying a Fenman in the 90s (in fact Ive had 5) however this particular one was pre owned and this was the exact issue, the owner had owned it 6 months and the power dropped so he pumped the ram up to compensate but the action became harsh, when the piston was removed the piston seal was totally burnt out, so a new one went in and the ram pressure was dropped a lot lower and guess what it became very smooth and a lot quieter:):up:
     
  11. engraver

    engraver Keyboard Hero

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    By the way the power usually dropped on every rammer Ive had after the first 6-12 months and I think this is down to a new gun burning (dieseling) off excess lube just like a springer and slightly burning the fringes of the piston seal, the opposite happens on a rammer the power goes down not up.

    This could happen on a new rammer after the first few hundred shots due to the ram running far quicker than the average springer it makes them prone to dieseling, once bedded in, if the power is ok they should shoot for decades without being too harsh.

    Some guys Ive known seem to like them set around 10 ft ibs max to winkle the most accuracy out of them, as its plenty for 30yrd hunting and 45 yrd targets.

    I found the smoothest rammers were always .22 and 90s made.
     
    Last edited: Jan 29, 2014
  12. paul finlay

    paul finlay Banned

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    Hi lads , evo stripped , internals cleaned and re- lubed , bout 200 pellets through her and hardly ant noise , somevuk Neil mod internals go go in , when I order anyway , so anyone got a vortex end cap going , Cheer's paul
     
  13. dave goodall

    dave goodall Donator

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    Wouldnt bother with either uk neils internals or vortex end cap both a waste of time as elliot as said its a rammer its not going to get much quieter
     

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