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News: Hw100 Exhaust Insert Design Change

Discussion in 'Technical' started by HW100Tuning, Feb 5, 2020.

  1. HW100Tuning

    HW100Tuning Tiddie Frog

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    One for @cloverleaf here:

    It seems the boffins at Weihrauch have made a significant change to the design of the exhaust insert for the HW100. It looks like an attempt to improve air throughput to the barrel. I do know that Weihrauch used to make the tip of the pellet probe hollow to do this, but in later years stopped the practice (probably cost too much to machine).

    This mod seems to do exactly the same thing but is built into the exhaust housing.

    You'll notice the finish on the new insert is pretty shoddy compared to the old version.
    Insert_002.jpg Insert_001.jpg
     
  2. Jonkem

    Jonkem Keyboard Hero

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    Manicure went well Steve :)

    I'll admit it took me a moment to realise what they are trying to achieve :facepalm:
    Presumably that design will give a better air expansion and dispersal behind the skirt, are you as unimpressed as you sound?
     
    HW100Tuning likes this.
  3. HW100Tuning

    HW100Tuning Tiddie Frog

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    Thanks mate - I do try to keep on top of personal grooming :p

    Mixed bag for me. I can see what they are trying to do, but this then raises the question Why? They must obviously be having issues with the insert, it's a lot of extra work involved... which will be costing them, yet no one has heard about it. Was it a mistake to stop making the pellet probe hollow?

    Just wondering what the gains are if any????

    Totally unimpressed by the lacklustre finish though, it looks like it has been rattling around in a toolbox for 20 years.

    Edit: The air comes up through a hole where the red arrow is pointing (might help others understand whats happening a little better).
    Insert_001.jpg
     
    Last edited: Feb 5, 2020
    TR158 and Jonkem like this.
  4. Jonkem

    Jonkem Keyboard Hero

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    Begs the question as to why, you're right.

    Looks from here that the 2 outer channels will allow for a lot of air volume more evenly expanded around the skirt?

    Who knows cause I certainly don't :facepalm:
     
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  5. HW100Tuning

    HW100Tuning Tiddie Frog

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    Like you say, it is obviously to allow for a lot of air volume more evenly expanded around the skirt :thumb:

    My question was more, WHY suddenly change it now?

    Another variable to consider is that this is a .177 insert - with the .177 carbine sometimes struggling to make 12ft lbs and maintain air efficiency... are they only applying the insert to the .177 variant?

    Interesting...
     
    Jonkem likes this.
  6. Rattymcrattyface

    Rattymcrattyface Ok boomer

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    Definitely trying to manipulate and focus the flow dynamics.
     
    HW100Tuning likes this.
  7. Jonkem

    Jonkem Keyboard Hero

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    When you're at the stage of testing it make sure you let me know if it's an improvement. I've got a .177 carbine that could do with using it's air better :up:
     
    HW100Tuning likes this.
  8. HW100Tuning

    HW100Tuning Tiddie Frog

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    Even if it was better... you cannot guarantee getting the new type. I just ordered a standard type for a customer and this arrived. I could order 10 more and get the old type :facepalm:

    Tell you what though, it wouldn't be that difficult to mod the original design, make a little insert and pop it in.... o_O
     
    Last edited: Feb 5, 2020
    TR158 likes this.
  9. Blackmax

    Blackmax Forum Rude Guy

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    Thanks Steve, it’ll be interesting to see what they send me as I’ve ordered one today for a .177 K which had a bent valve block.

    I can see what they trying to do but to me it raises more questions than it answers. I wonder what the effect on the barrel O ring will be as it butts up against that part?
     
  10. Jonkem

    Jonkem Keyboard Hero

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    That's a good point, how much bigger is the barrel O ring than the insert?
     
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  11. Blackmax

    Blackmax Forum Rude Guy

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    I wonder the exact reasons, I’ve never had problems with the O rings going other than over zealous barrel cleaning? It must deform the barrel O ring although I’ll need to see one in the flesh.
     
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  12. HW100Tuning

    HW100Tuning Tiddie Frog

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    Bent valve block you say? I wonder which ninja/hero/genius told about that one? lol ;)

    Seriously though, let me know what the one you get looks like, I have a.22 on order as well.

    The barrel breech o-ring fits fine, they made it with that in mind. I'll post a picture shortly.

    One thing @Jonkem changing the o-ring in the insert should be easier... also easier to mod it to take a slightly fatter o-ring as well. I've found this a poblem with some guns as well, very slack around that o-ring leading to air escape. In the past i have made oversized probes to combat this.
     
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  13. Blackmax

    Blackmax Forum Rude Guy

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    It was some northern superstar! I struggled to understand what he was saying initially but once I got a northern to southern translation book it was fine!

    I'll let you know when I get it.

    I wonder what the valve sleeving will have on this. Obviously in their mind the older style breech was strangling it of air.
     
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  14. Jonkem

    Jonkem Keyboard Hero

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    To be honest Steve, I don't ever have an issue with changing the probe O ring, just a square cut on a cotton bud shaft & being gentle guides it in perfectly.

    Have you got a pic of the outside of the insert?
     
    HW100Tuning likes this.
  15. HW100Tuning

    HW100Tuning Tiddie Frog

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    On it...
     
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  16. HW100Tuning

    HW100Tuning Tiddie Frog

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    Fits perfectly.
    IMG_20200205_155257644.jpg
    (Picture taken on top of one of @Blackmax going out shirts)

    @Jonkem under the screw in the top is a shed load of thread locker/sealant, I think they basically bonded the unit in. It's gonna make taking it out without damaging it a real pain. :down:
     
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  17. Jonkem

    Jonkem Keyboard Hero

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    Is the probe O ring sandwiched behind the new Venturi insert rather than in a machined groove?

    Is it open at the bottom of the 2 fins so the air can go 3 ways? Or are the fins only there to support the pellet whilst being probed do you think?

    I thought they were Andy's bestest pants for impressing the ladies :D
     
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  18. HW100Tuning

    HW100Tuning Tiddie Frog

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    Yes sandwiched....

    Yes fins just to support pellet..

    @Blackmax best pants look at a lot worse than that... also why would I have a pair of his pants? I just worried myself. :facepalm:
     
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  19. Blackmax

    Blackmax Forum Rude Guy

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    Now I’m worried!
     
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  20. Jonkem

    Jonkem Keyboard Hero

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    So it's not an elegant solution at all to whatever problem they thought there was. :(
     
    Blackmax likes this.

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