Fx Impact Fix & Mods for more FPS / FPE

Forums PCP Airguns Fx Impact Fix & Mods for more FPS / FPE

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    heavy-impact
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    edosan

     

    BTW I haven't made the probe mod I made on the 22 on the 25 and 30, I will do it soon, and post the results here

     

    You will get less restriction removing the top half of the pellet probe or 30% from the top and 30% from the bottom because the turn is less sharp. The entry hole in the probe should be larger than the hole in the brass port and the edges of the hole in the probe and edges of cuts to the probe knife edged.

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    edosan
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    You will get less restriction removing the top half of the pellet probe or 30% from the top and 30% from the bottom because the turn is less sharp. The entry hole in the probe should be larger than the hole in the brass port and the edges of the hole in the probe and edges of cuts to the probe knife edged.

    Excellent! thanks!

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    edosan
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    Some fun for the weekend

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    edosan
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    ackuric

    edosan

    I have been thinking about 0.22 pellet probe, and here is a theory:

    No matter how much we elongate, the main restrictor is the pellet probe end hole (no the TP hole) the one that finally send the air to the pellet, I mean the sequence is (pls correct me if I am wrong): TP Valve, TPBarrel (brass), TP Pellet Probe and finally end hole of the pellet probe. If you check that hole is tiny, smaller than the elongated transfer port, so here is an idea to share (and hopefully get some feedback) I will probably try it later:

    Thoughts?

    If it works might work for all calls, one less restriction.

    Thats essentially how a gen 1 marauder bolt probe works (I currently use a modified one). It will certainly help if the probe is currently a restriction. Heavy-Impacts approach works great as well and may even minimize pellet damage upon loading. 

     

    -Matt

    Hi Matt, this got me thinking, and lately I have been playing with my gen2 marauder…It was there getting dust and I decided to clean it and shoot a bit…I was amaze this is a MF tuff airgun…and very accurate….I took it apart completely (so easy!  and simple!) I remember a few years ago it was very complicated to me , but now it was like obvious…

    Anyway, I look up for the gen 1 marauders to understand what you are saying and yes the probe was like the impact, but in gen 2 the pellet probe was improved, so I will take the example and make a few pellet probe like the marauders, I think  this way it will give almost CERO restriction

    Wonder why FX are making the probe like that, having a better way

     

     

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    Jorgo
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    Endosan , I have till now no fx but  the graphic from original fx probe looks like the the probe chaimber the pellet on the skirt and the pinprobe chaimber the pellet in the skirt

    Maybe must make a longer pin that pushes the pellet after the tp port

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    Bob_O
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    Nice catch Jorgo.

    Also a longer pin might interfere with the magazine.

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    edosan
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    Jorgo

    Endosan , I have till now no fx but  the graphic from original fx probe looks like the the probe chaimber the pellet on the skirt and the pinprobe chaimber the pellet in the skirt

    Maybe must make a longer pin that pushes the pellet after the tp port

    You are right about the pin! good thinking! I have to check that … I get now that with the original probe the pellet/slug is always in the same place (after the TP), but with a pin, may vary depending on the deept of the "butt" / skirt of the pellet will be a few mm, I will check that and consider it, make sense! Thanks! (I will measure some pellets to be sure, but probably a couple of mm only)

    @bob_o thanks too! the marauder magazine been smaller than fxs, works almost the same as the Fx so should not affect that (my original mod does not affect at least)

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    heavy-impact
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    The pin type has to be a little longer to seat the pellet and has to be retracted further to clear the magazine. Aside from requiring a longer travel the pin would have to be very long for an Impact.

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    edosan
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    heavy-impact

    The pin type has to be a little longer to seat the pellet and has to be retracted further to clear the magazine. Aside from requiring a longer travel the pin would have to be very long for an Impact.

    Thanks! make sense too, will check on that, retract should not be a problem since it get retracted a lot, But I have homework! ;) 

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    heavy-impact
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    Once the top of a standard probe is removed you are free to remove brass from the barrel inlet above it for maximum flow. A slightly arching channel can be cut stopping just short of the pellet base. This would yield more flow, less restriction and a better expansion ratio than a dual port.

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    edosan
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    heavy-impact

    Once the top of a standard probe is removed you are free to remove brass from the barrel inlet above it for maximum flow. A slightly arching channel can be cut stopping just short of the pellet base. This would yield more flow, less restriction and a better expansion ratio than a dual port.

    Several parts are traveling, so mods will come! ;)

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    edosan
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    Changing subject…long range 30 cal pellets! see not everything is slug right now on long range! :)

    https://www.facebook.com/UtahAirguns/videos/2430827733593881/

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    Bob_O
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    30 caliber has been well know for long range accuracy with pellets.

    22 caliber can get there now with slugs.

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    edosan
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    Bob_O

    30 caliber has been well know for long range accuracy with pellets.

    22 caliber can get there now with slugs.

    I know, just for the fun of it … I would like to see a match between 0.30 pellet and 0.22 slugs… :D

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    edosan
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    Oh yeah!

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    edosan
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    Reg @ 150 and the 22.5

    The 24gn

    Can not test much this weekend, I did test a bit, and nope, accuracy is not there yet.

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    ackuric
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    Edosan, the pin style probes (gen 2 marauder) cause more interference and disturb the airflow much more than the crescent moon style probes (gen 2). Going from gen 2 to gen 1, I saw 15~ fps gain alone while the CSA on both were equal.

     

    Just think of it from an airflow standpoint, or even water flow…which one will flow most efficiently? In the 'pin style' the air will have to flow around the pin while making a 90 degree turn, where as the 90 degree turn should be much more efficient, less turbulent and smoother with the crescent moon style probe..at least IMO. The only reason for the update on gen 1 to gen 2 was to allow both left and right sided cocking, short of that its inferior in every other way.

    -Matt

     

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    edosan
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    Thanks! I thought it was an improvement, guess I will upgrade the mrod 😂

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    D-RIG
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    edosan

    Oh yeah!

    Here are some rounds that you have not seen yet 

     

    26 grain and a 33 grain HP and a 33 grain LHP and the 40 grain 2-S nose

    the 26 grain shoots very well from my Red Wolf on high power and should 

    be a excellent choice for the power that your making edosan .  Dale 

     

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    edosan
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    Thnx, pm sent

    Btw, my slug 600mm 0.22 liner have a TR 1:18

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