weatherby

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    weatherby
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    Yep, Wika all the way. I had bought one of the black ones but it was moving in a jerking way, and not responding to small adjustments.

    Also tuned someone else's impact with a Edmu, but I was fed up with it within 30 seconds because it turns off way too fast, and I kept on pressing to turn it back on.

    A accurate analog gauge is all I need, I don't care much whether the reg pressure is 2 bar higher or lower. 

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    weatherby
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    Powerbroker

    Glem.Chally

    I like how you call opening the transfer port a bit "machining".  Get a 2$ hand file and get it done.

    Thank you Glem.But i will be missing the ability to change caliber from 25 to 22 cal (The Impact was made for) with just turning those adjusters because at bigger port and longer spring, it will be impossible to lower the fps by 850, the sweet spot of every pellet. If i will loose that ability to change, then i should not buy an impact. My interest is to have the ability to shoot several calibers with little ease and discomfort. 

     

    With the stock kit, you can do that for sure.

    Watch the tuning video by 68whiskey. 

    I don't believe everything what I am told or see, especially in YT movies. I always have to try it for myself. (Don't get me wrong, there are fantastic tuning videos on YT, but the negative is that everyone can post video's on YT😉) 

    Turn all play out of the slider, and give it a little bit of preload. (read: a bit beyond all play removed.

    Don't go too far with that, on max. you should be able to still compress the slider slightly by hand on "max" setting, otherwise you might mess up your power wheel. 

    Reg to about 145 bar and go. 

    With a higher reg pressure, your window regarding power adjustment range will increase, you will have a lot more range between "min" and "max" setting. 

     

    • This reply was modified 1 week ago by weatherby.
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    weatherby
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    @bighun Hope your next transfer port will be good, looking forward to your results 😊

    Please test stock VS dual for reference. (Easy to do when you don't apply loctite to test) 

    I currently have 2 ports in house to enlarge, and the slots look bigger in real life than on the pictures. 

    Seems like a high quality part for sure. 

     

     

     

    • This reply was modified 1 week ago by weatherby.
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    weatherby
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    bigHUN

    I did a post not to bash anybody but to help myself out of a loop, I am sure Huma is still a great company producing fantastic products.

    If this would be a design error that is a no-no, but I am sure it is a human error and that is forgiving. We all do things….

    I have made and used much tighter ports that that, remember that the skirt needs to be pressed into the barrel eventually as well….

    Only difference is that it feels harder to seat the pellet because of the leverage difference of the sidelever at a earlier stage of the stroke. 

    It absolutely can't do any harm, I'd suggest to just try it out before making any assumptions ;)

    I chamfered my port a bit to guide the fat skirt king heavies mk1 a bit better, and I had no issues whatsoever. Worked perfectly :) 

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    weatherby
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    DanielL

    Glem.Chally

    DanielL

    ….

    Reliable manometer recommendations?

    A wika 

    And you have a hammerweight?  If you don't you can raise the reg and increase hammer spring all you want and power will plateau or drop.  

     

    Thanks.  Like this one?

    https://www.pcptunes.com/wika-300-bar-gauges-bottom-npt-threads.html

    I never ran into a plateau relative to regulated pressure.  At one point I somehow got close to 200 bar for the indicated regulated pressure and was sending the 33.95's downrange at 1025 fps. Not sure if it was regulated at all at that point. 

    At 200 bar, the hammer can't open the valve properly anymore, so I suppose your real pressure should have been somewhere around 150 bar.

    Around 150 bar is the reg pressure where the performance is at it's best with a stock PP set.

    B.t.w, another good way to degass is to remove the bottle, and turn the reg adjuster a wee bit counter clockwise, then it will empty the plenum volume.

    @bighun how can you loose the breech O-ring during dry firing? :D

     The only way I can think of that this can happen is when you dry fire without a probe installed. (never do that)

    With the probe in the TP piece, the o-ring is always secured by the probe, and dry firing is not a issue. 

    • This reply was modified 2 weeks ago by weatherby.
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    weatherby
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    spyde82

    Remember i would only use pellets to tune/find the most consistence setting on the reg and hammer not for the accturly precision and hammonic tuning, 

    I do it exactly like that, coarse setting with pellets, fine tuning with solids. 

    Works perfect for me. 

    The speed difference between H&N 25gn 217 slugs and monster redesigned 25.4gn was just about negligible in my gun. 

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    weatherby
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    heavy-impact

    weatherby

    heavy-impact

    I believe FX made some of their parts thicker because the have more to lose than a small business… But I think Michal's is plenty safe and well made.

    Just measured the PP OD, it is 33mm as well, just like the Polish plenum.

    When the wall thickness would have been 2mm less, (which I can hardly believe, as the wall thickness of the FX PP is an estimated 4mm) even then that does not give even close to an extra 17cc.

    Volume of a tube being 100mm in length and 30mm OD and 26mm ID only displaces 8.8cc….. 

    The PP is even shorter inside….. 

    I think we can conclude that there is definitely not a significant difference in volume between the PP and the Polish variant. 

    Too bad (well, actually not😜) my gun is in one piece again, otherwise I would have calculated the displacement of the PP  including the valve housing. 

    Even if they are the same the one from Poland is a much better deal at $150 USD delivered.

    Original PP is 139€ here in EU, or 150USD. Also, the original kit contains far more parts, new valve stem, new hammer, new hammerspring, new adjuster. These parts can be combined with the old parts, so that means more possibilities.

    Not trying to stirr the pot, but IMHO the original one seems like the best deal to me, especially if the displacement is about the same.

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    weatherby
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    Cranky1

    weatherby

    heavy-impact

    I believe FX made some of their parts thicker because the have more to lose than a small business… But I think Michal's is plenty safe and well made.

    Just measured the PP OD, it is 33mm as well, just like the Polish plenum.

    When the wall thickness would have been 2mm less, (which I can hardly believe, as the wall thickness of the FX PP is an estimated 4mm) even then that does not give even close to an extra 17cc.

    Volume of a tube being 100mm in length and 30mm OD and 26mm ID only displaces 8.8cc….. 

    The PP is even shorter inside….. 

    I think we can conclude that there is definitely not a significant difference in volume between the PP and the Polish variant. 

    Too bad (well, actually not😜) my gun is in one piece again, otherwise I would have calculated the displacement of the PP  including the valve housing. 

    So basically the main difference in a stock gun, polish vs fx would be the hammer spring giving the extra power. Which I think the 357 impact comes with a stronger hammer spring so in lower caliber it might have the same energy as a mk2 with polish plenum….. or I could be completely wrong….80% chance I’m wrong. 

    Another big difference is that the valve spring is inside the Polish plenum, while the FX PP valve spring is at the valve adjuster.

    I am running mine with a superlight VS, and the old style rubber ball. I can even use it without VS at all, and just the rubber ball.

    The old, longer hammerspring is actually softer than the shorter PP spring….

    To get more speed, the slider can be given a bit more preload at "max" setting, (play removed, and a bit extra preload) as long as you can keep on rotating the HST adjuster.

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    weatherby
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    heavy-impact

    I believe FX made some of their parts thicker because the have more to lose than a small business… But I think Michal's is plenty safe and well made.

    Just measured the PP OD, it is 33mm as well, just like the Polish plenum.

    When the wall thickness would have been 2mm less, (which I can hardly believe, as the wall thickness of the FX PP is an estimated 4mm) even then that does not give even close to an extra 17cc.

    Volume of a tube being 100mm in length and 30mm OD and 26mm ID only displaces 8.8cc….. 

    The PP is even shorter inside….. 

    I think we can conclude that there is definitely not a significant difference in volume between the PP and the Polish variant. 

    Too bad (well, actually not😜) my gun is in one piece again, otherwise I would have calculated the displacement of the PP  including the valve housing. 

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    weatherby
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    Very nice Vadimas!

    I like short shrouds, and with some design features like yours, they can be really silent :) 

    Keep it coming!

    Cheers, Gijs

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    weatherby
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    13brv3

    While I'm thinking about this, does anyone know the thread size for the brass transfer port?  I don't have a thread gauge that fits it, but I'm guessing maybe M12x1.00?

    Rusty

     

    Yes, it is m12x1

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    weatherby
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    Glem.Chally

    I might be mistaken,  its been a while since I installed it so I may be wrong.  I got roughly 33mm as the OD on the Polish plenum.

    It actually doesn't matter much, as we apparently have a shitload of power available on tap with both designs ;)

    Happy days, I'm really enjoying my Impact as a tuning platform again. Lost a bit of interest in AG's due to the ELR shooting thing, but now it all came back again.

    Would love to see a Polish plenum in real life, but they are not around in big numbers where I live.

     

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    weatherby
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    Glem.Chally

    weatherby

    Glem.Chally

    weatherby

    Scotaty

    Heavy-impact, have you measured both plenums? I had both plenums and I think they are the same size so I sold the the polish plenum and kept the fx one as I think it has way better build quality.

    I keep on wondering about that too……… The outer dimensions look identical, so I can't really point where the claimed extra 17cc is coming from……..

    One of the reasons that the Polish plenum is said to be more powerful could be that it uses the "old" valve housing, which looks to be less restrictive than the original PP valve housing.

    That's also the main reason why I have decided to make a new valve housing for the original power plenum, and I am getting some very good numbers in 22 cal.

    (fyi https://www.airgunnation.com/topic/pp-valve-housing-2-0/ )

    What is the OD of the power plenum?

    Haven't measured it yet Nathan (I'm also not at home right now) but looking at the pictures, the Polish plenum sits flush with the magazine plate underneath the breech block, exactly like it is the case with the FX PP.
    That makes me wonder if there really is a 17cc difference in between both plenums like the rumors say. 

    Just watched the video about the install of the Polish plenum, and there is a collar which needs to be mounted on the original valve housing, it looks a lot bigger than the original FX valve housing collar. If that is the case, it also takes away some volume from the plenum chamber.

    But again, I'm just speculating and judging from pictures, I haven't taken any real life measurements yet :)

    I think that collar is only used pre impact mk2.  I didnt use it on mine and it wasnt included after i told Michal i needed a plenum for mk2.  

    Copy that, thanks for the heads up :)

    I haven't seen a Polish plenum in real life, so I still can't say if my approach is true. (Just crushing my virtual 3D model brains on this one LOL) 

    I'll measure the OD of the PP when I have the chance, and post it here :) 

    Cheers, G

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    weatherby
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    Scotaty

    weatherby

    Scotaty

    Heavy-impact, have you measured both plenums? I had both plenums and I think they are the same size so I sold the the polish plenum and kept the fx one as I think it has way better build quality.

    I keep on wondering about that too……… The outer dimensions look identical, so I can't really point where the claimed extra 17cc is coming from……..

    One of the reasons that the Polish plenum is said to be more powerful could be that it uses the "old" valve housing, which looks to be less restrictive than the original PP valve housing.

    That's also the main reason why I have decided to make a new valve housing for the original power plenum, and I am getting some very good numbers in 22 cal.

    (fyi https://www.airgunnation.com/topic/pp-valve-housing-2-0/ )

    The power difference because of different hammer springs. The new valve adjuster can be opened all the way just before the oring. The 4 groves are not relevant anymore. Some people still think the 4th line is the maximum they can get from the valve adjuster. It could be true in older impact's without power plenum, but all newer impact with power plenum or new valving have a spring. 

    Here you can see the difference in valve housing between the PP valve housing (left) and the Impact X valve housing with separate valve seat (right).

    The PP valve seat sits way deeper than the old style valve seat, creating sort of a 10.5mm tunnel around the outer diameter of the valve poppet, which (IMHO) reduces flow.

    I found out that the speed of my gun had decreased when I installed my upgraded valve stem with PEEK poppet, which I made 0.3mm bigger in diameter than the stock valve……

    When I turned down the OD of the PEEK valve a bit, the speed increased again to the stock value.

    The old valve sits way higher, and the slots go all the way to the beginning of the valve seat, which means it is not in a tunnel like the PP valve housing. (Read: less restrictive)

    I hope my story is clear (it is difficult to explain), but when you check the photo below, you will know what I mean :)

     

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    weatherby
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    Glem.Chally

    weatherby

    Scotaty

    Heavy-impact, have you measured both plenums? I had both plenums and I think they are the same size so I sold the the polish plenum and kept the fx one as I think it has way better build quality.

    I keep on wondering about that too……… The outer dimensions look identical, so I can't really point where the claimed extra 17cc is coming from……..

    One of the reasons that the Polish plenum is said to be more powerful could be that it uses the "old" valve housing, which looks to be less restrictive than the original PP valve housing.

    That's also the main reason why I have decided to make a new valve housing for the original power plenum, and I am getting some very good numbers in 22 cal.

    (fyi https://www.airgunnation.com/topic/pp-valve-housing-2-0/ )

    What is the OD of the power plenum?

    Haven't measured it yet Nathan (I'm also not at home right now) but looking at the pictures, the Polish plenum sits flush with the magazine plate underneath the breech block, exactly like it is the case with the FX PP.
    That makes me wonder if there really is a 17cc difference in between both plenums like the rumors say. 

    Just watched the video about the install of the Polish plenum, and there is a collar which needs to be mounted on the original valve housing, it looks a lot bigger than the original FX valve housing collar. If that is the case, it also takes away some volume from the plenum chamber.

    But again, I'm just speculating and judging from pictures, I haven't taken any real life measurements yet :)

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    weatherby
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    Scotaty

    Heavy-impact, have you measured both plenums? I had both plenums and I think they are the same size so I sold the the polish plenum and kept the fx one as I think it has way better build quality.

    I keep on wondering about that too……… The outer dimensions look identical, so I can't really point where the claimed extra 17cc is coming from……..

    One of the reasons that the Polish plenum is said to be more powerful could be that it uses the "old" valve housing, which looks to be less restrictive than the original PP valve housing.

    That's also the main reason why I have decided to make a new valve housing for the original power plenum, and I am getting some very good numbers in 22 cal.

    (fyi https://www.airgunnation.com/topic/pp-valve-housing-2-0/ )

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    weatherby
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    It's a Chinese clone of the Deckel S0, but it works fine for me.

    It is called "U3 tool grinder" and you can find them in many different brands, most likely all from the same factory. 

    If you want a very good one, I'd suggest to buy the Vertex variant from Taiwan. But the Chinese one works just fine for me, and it was a lot cheaper. 

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    weatherby
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    heavy-impact

    I like your machine. I have a drill doctor 750 that I'm not very impressed with.

    I use these diamond lapidary discs on a normal bench grinder for grinding tungsten but they would do well grinding tools with the proper fixture. The 600 grit disc that I use for 2% lanthanated tungsten is still like new after 7 years.

    Those grinding disc's look good, and they are even not too expensive too👍😊

    With all due respect, but I'm not a fan of the drill doctor for precision work. Good enough for construction work, but not good enough for precision work, mainly due to the plastic chuck instead of collects, which have sometimes centering issues. 

    For grinding d-bits etc. I use the machine below. I also have some diamond wheels for it to grind carbide end mills etc. 

    I don't use them very often, but I can't do without them.

    • This reply was modified 2 weeks ago by weatherby.
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    weatherby
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    @Glem.Chally, Haha, sorry to disappoint you, it takes far too much time to make such parts on conventional machines, it would make things way too expensive. I purely do this for fun and as a hobby, and maybe to inspire other enthusiasts :)

    @heavy-impact As promised, here are some pics of my reground drill to surface the valve seat.

    I have a cheapo set of drills to grind into other profiles if needed, not gonna sacrifice my expensive 8% HSS-Co drills for that purpose😉

    • This reply was modified 2 weeks ago by weatherby.
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    weatherby
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    Glem.Chally

    Fantastic work Gijs,  have you tried it yet? (Probably not just asking) are you going to get a .35 setup?

    Thanks Nathan, yes, it works quite well, current "highscore" is 103 joules or 76ft/lbs in 22cal :)

    I'm gonna make a new hammerspring as well in 1.5mm wire thickness. I've already made one, but the pitch could be slightly increased to create a bit of a longer.spring.

    My current 1.5mm spring was bottoming out when cocked with still a bit room left on the HST slider, this also means that there is potential for even more speed😁

    I'm gonna test this setup with 25 and 30 cal 700mm barrels as well in the future, and I have confidence that it is gonna be a real powerhouse in the larger calibers.

    Because I have changed the position of the slots, I could also combine the power plenum with a extra added plenum through the manometer hole if needed :)

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