bigHun and Glem.Chally, I agree with both of you. What do you stand to gain for so much work? I only was offering a suggestion for a solution for Jkings problem of probe depth.
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FX Impact MK2 PP 700 mm 25c transfer port
- Thread starter bigHUN
- Start date
Now I got it, toke all apart and measure it up...
I have a question to all of you existing Impact owners, I may be wrong but,
Did you ever noticed any back-blow?
The pellet probe is not sealed in the brass port piece, the probe OD is 6.38 and the barrel brass port piece ID 6.45! No matter what port OD hole opening you have it blows (a certain amount) backward into the pellet magazine and never full 100% power.
Of course the speed with the single tray pellet loader is more consistent...that one have a rubber or silicon (or whatever material) seal around the probe and seals with the port.
This is my pin style probe and how I managed to get a consistency within +/-3 fps @ 766 with my 22 cal (non FX), the orange orings are wear resistant and still I put two of them. Yes, rubbing the magazine at push through but no blow back.
I have a question to all of you existing Impact owners, I may be wrong but,
Did you ever noticed any back-blow?
The pellet probe is not sealed in the brass port piece, the probe OD is 6.38 and the barrel brass port piece ID 6.45! No matter what port OD hole opening you have it blows (a certain amount) backward into the pellet magazine and never full 100% power.
Of course the speed with the single tray pellet loader is more consistent...that one have a rubber or silicon (or whatever material) seal around the probe and seals with the port.
This is my pin style probe and how I managed to get a consistency within +/-3 fps @ 766 with my 22 cal (non FX), the orange orings are wear resistant and still I put two of them. Yes, rubbing the magazine at push through but no blow back.
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Sorry if I made a confusion, I don't know this is a first time I have the probe in my hands, maybe it is a language only how people earlier called it "a hole".
My question was based on somebody sad earlier about a dimension "5.0x7.2 elongated", but what I see is, my probe have an opening width of 5.85 which is actually not a hole (just look like a hole) but cut-in from the side that looks like a "V" shape. Maybe it is just a perspective from which side you looking in to it, take a look the pictures taken from two angles (like a top view and front view).
Without having a brass piece in my hands I don't see a reason "elongating" or making it wider/longer because the limit is the probe-tube ID 5.15 and that is the "area" the air must go through. Midnight at my place, piece and quiet in the house, feels like a perfect time to take the Impact apart - for first time
I did elongate both the probe and brass transfer port
I am talking about my own modifications here, not the impact in stock form (As "stock" isn't in my dictionary
)I also said that I have increased the inner diameter, like it can be seen on the photo I have posted. The walls are very thin.
Yesterday, I've reached 103 joules (almost 76ft/lbs) in 22 caliber, so I suppose there is little wrong with the flow of my probe
By the way, I haven't noticed any blow by between probe and barrel inlet.
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...I am talking about my own modifications here, not the impact in stock form (As "stock" isn't in my dictionary
Weatherby, I am with you
For the most fps performance - also consistency - a seal shall be in place. But we all know no matter how to design it (and maybe million ways to do) that sealing would be a most HIGH MAINTENANCE and cost effective solution on the gun...want to save time = no bueno, want to save money = no bueno...
I cannot think of any solution but to replace a seal after every some 100 shots (or around a number), but that would lead to any kind of complains especially from non educated (we cannot afford any affairs with customers, right?). Even if you buy a 7 $ figure Ferrari some maintenance shall be done to keep it up to a level.
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...I am talking about my own modifications here, not the impact in stock form (As "stock" isn't in my dictionary
Weatherby, I am with you
For the most fps performance - also consistency - a seal shall be in place. But we all know no matter how to design it (and maybe million ways to do) that sealing would be a most HIGH MAINTENANCE and cost effective solution on the gun...want to save time = no bueno, want to save money = no bueno...
I cannot think of any solution but to replace a seal after every some 100 shots (or around a number), but that would lead to any kind of complains especially from non educated (we cannot afford any affairs with customers, right?). Even if you buy a 7 $ figure Ferrari some maintenance shall be done to keep it up to a level.
I think there is little wrong with probe o-rings, I almost never have issues with them.
I apply a light coat of silicon oil on the probe every now and then to lube the o-ring, it will sure last long.
A good quality o-ring will last a long time. Viton or even better, PU.
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Uhm, what you mean by "probe orings" ? any picture? because I have no oring on the probe, metal to metal in between the probe and brass port.
When I measure last night the barrel -brass end port I noticed a diameter difference inside the hole (from the edge starts with ID 6.67x3.22 and then transfers to smaller ID 6.45 that could be a pilot hole for the probe transfer port) that didn't make any sense to me why that would be needed there, but OH WELL somebody made the design.
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I meant the o-ring to seal the probe-barrel connection, regardless which side it is in/on.
And when there is no O-ring in your barrel Inlet, you have most likely found your inconsistency issue
There should be one. Upvote 0
I meant the o-ring to seal the probe-barrel connection, regardless which side it is in/on.
And when there is no O-ring in your barrel Inlet, you have most likely found your inconsistency issue
I open that side lat night and I cannot recall seeing any oring inside the brass port-piece, the hours was way beyound midnight and I must have been eye tired, I will look again.
Imagine this, I have my FX for almost 10 days now and I have not shot a single pellet yet?
I have ordered several "exotic" upgrade parts from several places US and EU, some came in and some still in my way. I have an idea in front of me what I want to tune for, and without these my parts I just cannot do. I spent all this time building my sighting-in fixture that I plan to use as a bench rest as well.
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A little allenkey fell on floor, right beside was a small black oring. Fortunately enough I was wearing my glasses.
I found it !!! That must be the oring weatherby was talking about. A quick look in the FX barrel diagram, the size is correct, must have gotten lost a very first day I was degassing the gun. Lube it and put it back in the probe. What a night...usually I vacuum the floor whenever I finish some hobby project, this oring would be gone for sure and I would never figure out what you people talked about.
I need to apologize to all folks I made them tinker too much about back-blowing air, and special Thanks to weatherby for the picture above.
I found it !!! That must be the oring weatherby was talking about. A quick look in the FX barrel diagram, the size is correct, must have gotten lost a very first day I was degassing the gun. Lube it and put it back in the probe. What a night...usually I vacuum the floor whenever I finish some hobby project, this oring would be gone for sure and I would never figure out what you people talked about.
I need to apologize to all folks I made them tinker too much about back-blowing air, and special Thanks to weatherby for the picture above.
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Sorry Hande Thanks for the picture and thank you All
Still my Huma parts are in the mail somewhere between EU and CA, what else I can do until I wait? Order some NBR90 orings for stiffer barrel support, still on my list.
Btw forgot....I got myself the extended arca-swiss rail I can clamp the gun to a tripod head instead of using bipods. Replaced it last night and seeing a new problem.
The original FX female quick coupler socket won't reach down there in the hole long enough if I want to refill. I would need to buy somewhere an extended coupler socket or to extend/lift up the male disconnect. Now the problem is that the male fill probe/disconnect have a needle valve inside (one way) and if I use my BSP extending fitting underneath, a very first time I degass the gun that needle will fall inside.
How would you do a workaround?
and thank you AllStill my Huma parts are in the mail somewhere between EU and CA, what else I can do until I wait? Order some NBR90 orings for stiffer barrel support, still on my list.
Btw forgot....I got myself the extended arca-swiss rail I can clamp the gun to a tripod head instead of using bipods. Replaced it last night and seeing a new problem.
The original FX female quick coupler socket won't reach down there in the hole long enough if I want to refill. I would need to buy somewhere an extended coupler socket or to extend/lift up the male disconnect. Now the problem is that the male fill probe/disconnect have a needle valve inside (one way) and if I use my BSP extending fitting underneath, a very first time I degass the gun that needle will fall inside.
How would you do a workaround?
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Sorry Hande Thanks for the picture
Still my Huma parts are in the mail somewhere between EU and CA, what else I can do until I wait? Order some NBR90 orings for stiffer barrel support, still on my list.
Btw forgot....I got myself the extended arca-swiss rail I can clamp the gun to a tripod head instead of using bipods. Replaced it last night and seeing a new problem.
The original FX female quick coupler socket won't reach down there in the hole long enough if I want to refill. I would need to buy somewhere an extended coupler socket or to extend/lift up the male disconnect. Now the problem is that the male fill probe/disconnect have a needle valve inside (one way) and if I use my BSP extending fitting underneath, a very first time I degass the gun that needle will fall inside.
How would you do a workaround?
I have the Saber tac picrail.
No problem here, as the quick connect can be accessed through the trigger guard.
I wonder why you haven't shot it yet as is?
You wouldn't believe, but a stock impact can perform as well
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I have the Saber tac picrail.
No problem here, as the quick connect can be accessed through the trigger guard.
I wonder why you haven't shot it yet as is?
You wouldn't believe, but a stock impact can perform as well
I got the Saber Tac extended guard with a arca-swiss rail for arca tripod head. From the pictures look like your rail have a larger hole, my rail is deeper. I tried to connect but my fingers won't fit underneath to release the quick connect.
I still have a winter here at my place, the snow just melted and it was raining for days kind of big fluctuation in weather but mostly sub zero still.
I don't plan much modifications only waiting for a big Huma digital gauge to tune my gun regulator, also the new brass transfer port is in the same order. In mean time finishing my shooting jig for sighting in my scope for long ranges. Pretty much waiting for parts and always some new things surfacing along the line I am tinkering with an empty gun
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Here me talk again, I made a CAD model from my basic measurements to have a bit more understanding what could be done to the transfer port.
I am sure that no significant gain in airflow could be achieved with the existing design no matter how much to elongate the hole in the probe or the brass piece, the probe ID 5.15 is a limit with a single hole port piece, cutting through the probe front edge (half moon shape as some folks calling it) can result a pellet or slug to stuck or jam in moment of loading.
I will see what the numbers would look like with the new Huma dual rectangular port, but the limit of ID 5.15 is still there, theoretically.
Only big gain could be possible if the pellet probe would retract back (to the left on the image) completely beyond the transfer hole, but that is a different ballgame. A major change from FX redesigning the cocking mechanism total travel distance.
I am sure that no significant gain in airflow could be achieved with the existing design no matter how much to elongate the hole in the probe or the brass piece, the probe ID 5.15 is a limit with a single hole port piece, cutting through the probe front edge (half moon shape as some folks calling it) can result a pellet or slug to stuck or jam in moment of loading.
I will see what the numbers would look like with the new Huma dual rectangular port, but the limit of ID 5.15 is still there, theoretically.
Only big gain could be possible if the pellet probe would retract back (to the left on the image) completely beyond the transfer hole, but that is a different ballgame. A major change from FX redesigning the cocking mechanism total travel distance.
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I am getting worried !
Wanted to order something today from Hungary to Canada (not airguns related), they say all International mailing/shipping suspended until April 30th, inside EU they still doing.
That makes me think deeper, I ordered the Huma parts March 8th nothing arrived yet. I ordered fill hoses from aliexpress mid January nothing arrived yet. Good thing at that time (in January) I cancelled my aliexpress order for YongHeng compressor because I saw one last unit in BC paintball shop.
Then I neded to re-tap 10x1 mm some fittings for the compressor (all Asia using metric threads) I had a hard time to find locally that stupid Tap size.
Then I needed to re-tap to 1/8 BSPP some fittings (all EU origin products using those threads) because doesn't fit to some of my 1/8 NPT fittings, I could not find that Tap at all. I had to improvised with teflon tape to hold things together.
I have a CF tank, missing a DIN connection release valve to connect a fill hose, because of a different thread again...Oh man, where we are heading?
Me better order couple tins of pellets if still not to late.
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