FX Impact MKII strip down and reasembly

Forums PCP Airguns FX Impact MKII strip down and reasembly

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    edosan
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    Good morning all

    Last night I took my MKII apart add a few improvements and rebuild, here are some pictures and findings

    Before surgery ;)

    growing from 480cc to 580cc

    so let's  start with the hammer valve bumper

     

    First finding: C3 bumper has change, but donno if is for good, light blue orings usually are 70 on hardness, any way I took it out and replace that with an acetal washer (acetal = delrin, delrin is a comercial name, acetal is the correct name)

    Hammer, spring and guide are the same than the old impact

    careful when removing the block, several rubber parts might get loose and lost if you are not careful

    the lever pin looks reinforced

    Now let's go for the valve and the valvetube, first difference due the new mag, you can not access direct to the holding screw of the valve housing. now you have to remove the gauge and 4 screws in order to get access to the secure lock screw on the valveH.

    Gauge and protective black cap

    view after gauge removal

     

    After taking those 4 screws you have access to the locking screw

    zoom out

    taking the valve seat out

    Some measures

    ValveTube OD (better measure, old is 19.7mm or so)

    ValveSeat

    Acetal Rod ValveSeat seal

    And the bad news…  in order to have the bigger plenum (valveTube) in old impacts (non mk2) is not just getting the new valvetube, you also need a new valvehousing or some sort of adaptor. The threaded part of the ValveSeat is wider than the old one 2mm wider

    old valveseat

    MK2

    ValveSeat (the rest is about the same)

    Internals changes made: New VS 6.35 (thanks Ernest!) , hammer weight and C3 bumper changed (that VS might be also 6.5mm usually we have about 0.2mm difference with Ernest! jaja) 

    External Plenum

    In order to add an external plenum, is needed to remove the lower "bridge" of one ValveHousing (or mill) without doing this you have an obstructed path and there is no point adding it. And since the ValveHousing is different than the old ones, I did not do it until I get the adaptor or the new VH. (as a spare part)

    Here a pic where you see the VH "blocking" the gauge hole (but is good enough for the gauge). I do not think the external plenum is needed due the extra ValveTube size on the mk2, but further test needed on my side.

     

    that it basically, I thought the new gauges where black on the side, I was wrong, is a protective/decorative cap (you can change that for silicone colour caps if you like)

    External changes made: Bottle change from 480cc to 580cc

    And a new rail for the bipod, pressure again, in 200b, left it overnight for leaks, check it this morning and 200b spot on, so all good

    Hope it helps! test coming soon.

    Next: Vortex 60X is coming :D 

    Quick FPS test reg @ 145b shooting monsters 25.4gn (cheaper for speed testing  than slugs) 970 FPS, the mods I add will start looking good at reg over 150b. 

    And do not forget, if this post helps, a simple thanks is good enough for me ;) 

    • This topic was modified 9 months ago by edosan.
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    broekzwans
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    Very clear strip down, very useful 😁

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    Swish
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    Very cool. Thanks for sharing, I'm sure you just answered a lot of questions that a lot of us have been wanting to know. 

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    jking
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    Edosan, how are the gauges checking out for accuracy? They kind of look like Wika's externally. If so that'll be a huge improvement.

    Jking

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    orion
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    where did you get that big bottle?

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    Bob_O
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    Nice Edosan!!

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    Spray1Mark
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    Thanks, still waiting for my MKII parts, where did the 580 bottle come from if you dont mind me asking?

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    broekzwans
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    Spray1Mark

    Thanks, still waiting for my MKII parts, where did the 580 bottle come from if you dont mind me asking?

    Talon tunes and Utah Airguns have them. Hopefully they'll be available soon in europe too..

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    Spray1Mark
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    Also the very important question!

    Do you actually get more power?

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    rflopes3
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    So the only changes you made on the MK2 was the valve seat diameter, hammer weight and C3 bumper? How about the velocities ? Any changes ?

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    Spray1Mark
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    broekzwans

    Spray1Mark

    Thanks, still waiting for my MKII parts, where did the 580 bottle come from if you dont mind me asking?

    Talon tunes and Utah Airguns have them. Hopefully they'll be available soon in europe too..

    Thanks, but we have a factory in Korea.

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    edosan
    Participant
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    Hi, glad it help.

     to answer some of your Q.

    Bottle: TalonTunes, if you check the pic you can see the logo. NO VALVE! (BTW I like the TT logo, is cool), great service BTW

    Valve: Ohio Airguns, do not forget to LOCTITE the threads!

    (less than 300 bucks) is cheaper than other places 

    Gauges: Yes they look wika but donno, probably not, do not remember the name right now, but those might be the same brand than the digitals shown on IWA. So far they look accurate (but need more time to tell)

    More Power?: No, less that is why I made the changes! :D jaja just kidding, for those that do not know, my old X was shooting 100fpe+ with the mods on .30 cal, with the changes I add I expect between 50 to 100fps more, My ports where elongated also (But I did that as soon as I test my mk2, that only give a gain of 50fps +- )

    BTW: mk2 shoot slugs out of the box (regarding more power) I just love tinkering and get the best of it. And I was curious to see the diferences with my "normal" old X! 

     

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    nevermore
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    where to buy the larger valve seat ,c3 bumper and heavy hammer?

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    edosan
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    nevermore

    where to buy the larger valve seat ,c3 bumper and heavy hammer?

    Good question, as right now? nowhere

    You have to make it yourself or send it to FX USA for an upgrade (call them first and you need to talk with Ernest Rowe), and  have a lot of patience since is a very busy guy! 

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    Scotaty
    Participant
    Member

    Thank you Edosan. I have few questions for you. 

    You said the difference between the old and the new valve housing is the thread. What about the rest of the body, are they the same diameter?

    The pin in the cocking block that attaches to the leaver. Is it bigger?

    Did you weight the new hammer?

    Thanks again 

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    edosan
    Participant
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    Scotaty

    Thank you Edosan. I have few questions for you. 

    1- You said the difference between the old and the new valve housing is the thread. What about the rest of the body, are they the same diameter?

    2- The pin in the cocking block that attaches to the leaver. Is it bigger?

    3- Did you weight the new hammer?

    Thanks again 

    Hi Scotaty, I add numbers to your Q.

    1- Yes are the same, only change I notice was the threaded part, but any update on old impact must include both parts ValveSeat and ValveTube (Would love to know why they engineered like that, I imagine there is a reason wonder if that reason if technical or comercial (to avoid aftermarket) ).  Point is, you can not use the old valvehousing with the new valvetube

    2- Check picture (zoom in), looks a bigger insert on the block

    3- I did, same than before 19grams +- 

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    golfer70
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    Thanks for posting the tear down. Pretty cool to see the inner workings of such a complex instrument. To be honest, I was afraid you wouldn’t be able to get it all back together correctly with all the little parts and such. I would have been nervous as heck. It’s nice that you and others are out there to help out the rest of the community. Thanks Edosan!

    Best wishes

    Tim. 

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    edosan
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    golfer70

    Thanks for posting the tear down. Pretty cool to see the inner workings of such a complex instrument. To be honest, I was afraid you wouldn’t be able to get it all back together correctly with all the little parts and such. I would have been nervous as heck. It’s nice that you and others are out there to help out the rest of the community. Thanks Edosan!

    Best wishes

    Tim. 

    I am a golfer too! you are welcome! ;)

    Jaja it is an intimidating work of engineering! but once you get it, is very straight forward. I strip a Marauder a few weeks ago…so simple…I remember a few years back I found the marauder complex!, jaja things change. 

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    stoti
    Participant
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    EDOSAN, yeah my brotha… that was awesome! +1 for sure. I already have the 580cc bottle and didn't realize it was so much bigger. It really doesn't look like it until sitting next to the smaller one. How many of these parts are you making vs. buying? I remember saying you were either machining down or making some parts. I need to pick your brain a little more. So have you shot it since installing the parts? What kind of gains are you seeing? 

    Thanks buddy, Stoti

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    mtnGhost
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    @edosan – are you going to be able to lift it up now with that heavy bottle and bipod?! … zzzZing 👊 😉 

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