Announcing the FX Impact MKII w/ FX Power Plenum
- Thread starter FX-USA
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I have received a new valve housing 2 weeks ago with integrated valve seat. This will fit with the new power plenum ?
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No.
New power plenum set consists of new valve housing with integrated valve seat, valve rod with valve, hammer, valve control set front part, hammer spring, plenum.
New power plenum set consists of new valve housing with integrated valve seat, valve rod with valve, hammer, valve control set front part, hammer spring, plenum.
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Confusing a bit. I do own a brand new valve housing with integrated valve seat already installed. Do i need to change it for the new power plenum kit or not ?
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I think all this talk about doubling-the-shot-count breaking the laws of physics requires us to assume we are working with a true closed system. If we simply consider all the available potential energy to be limited to the pressure x volume inside cylinder, then such a huge efficiency increase (from perfected mechanics) does seem obviously impossible.
But, if we assume the air in the plenum has time to absorb thermal energy from its surroundings, the system becomes thermodynamically open (to the ambient temperature). If you run some basic estimates (combined gas law) on how much additional energy gets absorbed when you dramatically drop the regulator pressure, it seems like you can get there without having to rewrite physics.
We know that, no matter what, all the cold, expanded air that is expelled during a shot is ultimately warmed up to ambient temperature. But, with a high reg pressure, most of this warming process happens after the pellet has exited the barrel. With a lower reg pressure, more of the warming process can happen before the trigger is pulled (in the plenum)...
That’s additional energy entering the system before each shot.
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My friend, Your brand new valve housing became old new housing overnight. In package called "power plenum" You will receive all bits needed to power upgrade Your gun no matter is it Impact 1, Impact 1 ver2, Impact X or Impact mk2. Like I wrote it consists of: brand brand new valve housing, plenum, hammer, spring, new valve stop system, valve rod with new valve and possibly hammer weight.
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Now that is clear enough my friend. Thank you.
Another question is....why this kit has to be installed by FX USA or distributors ? Most of us owning Impact 1 know how to install this kit ...No ?
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You are welcome, glad we solve this together.
For reason why FX USA or distributors have to install power kit I do not have answer. Maybe You can order it from some other than FX USA. I live in Serbia, here we have maybe 5-10 Impacts in total and only two of us do our modding all by our self and we voided warranty long time ago. I went to lathe machinist to made my own hammer weight, drilled valve seat etc. We do not have FX office like You in the America. We buy parts from other countries and find our way around. It is time consuming process.
For reason why FX USA or distributors have to install power kit I do not have answer. Maybe You can order it from some other than FX USA. I live in Serbia, here we have maybe 5-10 Impacts in total and only two of us do our modding all by our self and we voided warranty long time ago. I went to lathe machinist to made my own hammer weight, drilled valve seat etc. We do not have FX office like You in the America. We buy parts from other countries and find our way around. It is time consuming process.
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I have successfully installed an early sample of the Power Plenum kit on my Impact MKI and have been testing it in the last couple of days, just registered on AGN to answer some of the questions and share some experiences 
First of all the upgrade kit is compatible with all generations of the Impact and does not require any additional parts for installation, all the necessary parts are included in the kit.
Here's an image of the new Power Plenum and valve housing compared to the older models, like with the latest MKII housing the valve seat is now fixed.
The kit also comes with a redesigned hammer which has now an integrated C3 delrin bumper which lowered the weight a little to 18.53 grams vs the 19.3 grams of the original hammer, an additional 6.1 gram hammer weight is provided however so the total hammer weight is increased to 24.63 grams.
The valve system also had a significant upgrade, the valve seems a little bigger and is now firmly fixed to the valve rod with some sort of glue. The valve return spring has been moved from the plenum side to the front in the valve adjuster knob where the new spring also replaces the rubber ball.
First of all the upgrade kit is compatible with all generations of the Impact and does not require any additional parts for installation, all the necessary parts are included in the kit.
Here's an image of the new Power Plenum and valve housing compared to the older models, like with the latest MKII housing the valve seat is now fixed.
The kit also comes with a redesigned hammer which has now an integrated C3 delrin bumper which lowered the weight a little to 18.53 grams vs the 19.3 grams of the original hammer, an additional 6.1 gram hammer weight is provided however so the total hammer weight is increased to 24.63 grams.
The valve system also had a significant upgrade, the valve seems a little bigger and is now firmly fixed to the valve rod with some sort of glue. The valve return spring has been moved from the plenum side to the front in the valve adjuster knob where the new spring also replaces the rubber ball.
Upvote 0
I have successfully installed an early sample of the Power Plenum kit on my Impact MKI and have been testing it in the last couple of days, just registered on AGN to answer some of the questions and share some experiences
First of all the upgrade kit is compatible with all generations of the Impact and does not require any additional parts for installation, all the necessary parts are included in the kit.
Here's an image of the new Power Plenum and valve housing compared to the older models, like with the latest MKII housing the valve seat is now fixed.
The kit also comes with a redesigned hammer which has now an integrated C3 delrin bumper which lowered the weight a little to 18.53 grams vs the 19.3 grams of the original hammer, an additional 6.1 gram hammer weight is provided however so the total hammer weight is increased to 24.63 grams.
The valve system also had a significant upgrade, the valve seems a little bigger and is now firmly fixed to the valve rod with some sort of glue. The valve return spring has been moved from the plenum side to the front in the valve adjuster knob where the new spring also replaces the rubber ball.
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Like with the out of the box MKII specification the max speeds seems to be achieved with the Power Plenum kit between 145 and 150 bar, at this pressure the speed gains are 15-20ms / 50-65fps for the .22, .25 and .30 calibers. It seems that there's still enough room for exploring the new setup with heavier hammers and springs to shoot at higher pressures.
Due to the 145-190 bar pressure range of the installed high power Huma reg I could not validate the increased shot count that comes with shooting at lower regulator pressures.
Due to the 145-190 bar pressure range of the installed high power Huma reg I could not validate the increased shot count that comes with shooting at lower regulator pressures.
Upvote 0
I have successfully installed an early sample of the Power Plenum kit on my Impact MKI and have been testing it in the last couple of days, just registered on AGN to answer some of the questions and share some experiences
First of all the upgrade kit is compatible with all generations of the Impact and does not require any additional parts for installation, all the necessary parts are included in the kit.
Here's an image of the new Power Plenum and valve housing compared to the older models, like with the latest MKII housing the valve seat is now fixed.
The kit also comes with a redesigned hammer which has now an integrated C3 delrin bumper which lowered the weight a little to 18.53 grams vs the 19.3 grams of the original hammer, an additional 6.1 gram hammer weight is provided however so the total hammer weight is increased to 24.63 grams.
The valve system also had a significant upgrade, the valve seems a little bigger and is now firmly fixed to the valve rod with some sort of glue. The valve return spring has been moved from the plenum side to the front in the valve adjuster knob where the new spring also replaces the rubber ball.
Thank you very much. This is very clear.
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For those in Europe whom asked where I got the Power Plenum; Krale expects a new shipment somewhere next week according to their site and they will sell them for €139 incl VAT.
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Thanks for all the information!
I ordered From EuropeAirguns and it was €163.31 EUR (including tax + shipping to Finland).
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I don't know where the 100% shot count got started but if you go to the first page of this thread it says
.25 cal goes from 75 shots to 110
.30 cal goes from 40 shots to 60
.25 cal goes from 75 shots to 110
.30 cal goes from 40 shots to 60
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