Fx impact mk2 with dual plenum

[mubhaur]

Fx impact mk2 with power plenum and external plenum of 50cc gives more efficiency. 

At 890 fps with 18 grain .22 jsb I get 200 shots.

This may be used for more power.

Umair Bhaur 

 

[qball]

Wow very interesting! Just wondering at what point is too much plenum or is there such thing?

 

[yenniedn]

Seems excessive from an ergonomic and weight perspective but you can't argue with the shot count...

 

[triggertreat]

From everything I have gathered, the additional plenum is of little to no benefit to the power plenum. Now that all comes from here say as I haven't seen anything proven directly. I don't think you can have to much plenum space to hurt anything in this particular gun, but the diminishing returns kick in at some point. Just based on some speeds I have run, I really don't need more on the power side with just having the PP and the slug kit. I am not saying I wouldn't want more, but can break the sound barrier already as is.

 

[OrdnasNS]

At what pressure is reg set?

 

[Vetmx]

That 700mm barrel doesn’t hurt either. Very easy to hit the magic 890fps with the 18’s with a low reg setting. But still, 200 shots is outstanding. 

 

[mubhaur]

At what pressure is reg set?

Reg pressure is 95 bars and barrel is 700mm

 

[qball]

At what pressure is reg set?

Reg pressure is 95 bars and barrel is 700mm

95 bars??? Go lower!!! How low can you go?  

my impact with PP came from factory with 90 bars and shooting JSB 26 grain at 920FPS so with 18 grain you can easily drop to minimum 80 bars and have 250 shots!!! Kinda expensive to test that theory though.