Gas efficiency issues, anyideas team?

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Well Rockdogbert I fell asleep and I see a load if adice has been given already lol :lol:

My grey matter thinks springs will be the answer to control the amount of gas used or perhaps wasted as it were. From watching videos of the Tavor they seem to pump loads of gas out the shell ejector port on the blowback, far more than appears to serve any purpose. The NPAS would control limiting the gas expelled down the barrel but in terms of wasting gas; stronger springs on the valves would reset the valve to closed quicker letting less out in the first place - or a weaker spring on the bolt carrier to strike the valve softer but I'd opt for a stronger closing spring rather than the weaker opening option. 

Curious if you've tried Red Gas and if you get the same issue. Some of the vids show the Tavor with some high FPS numbers (higher than UK legal) so I wonder if the FPS limit we have here is causing a lack of performance in how the parts are gelling together. Just thinking if it was designed to run on a more powerful setup and it's been in turn handicapped for our market resulting in poor performance etc... not sure if that makes any sense - I can try and reword it.  :lol:

 
You’ve got a set amount of gas leaving the magazine (assuming the valve knocker is functioning properly).  

How that gas is distributed between pushing the BB and powering the blowback is down to the float valve. I think using a softer and or shorter float valve spring will help. I’d also try a mag of .20’s and a mag of the heaviest BB’s you can find and see if that makes a difference as the float valve works on pressur difference. The heavier the BB, the longer it’s in the barrel being pushed by the gas (hence joule creep on GBBR’s)

 
Well Rockdogbert I fell asleep and I see a load if adice has been given already lol :lol:

My grey matter thinks springs will be the answer to control the amount of gas used or perhaps wasted as it were. From watching videos of the Tavor they seem to pump loads of gas out the shell ejector port on the blowback, far more than appears to serve any purpose. The NPAS would control limiting the gas expelled down the barrel but in terms of wasting gas; stronger springs on the valves would reset the valve to closed quicker letting less out in the first place - or a weaker spring on the bolt carrier to strike the valve softer but I'd opt for a stronger closing spring rather than the weaker opening option. 

Curious if you've tried Red Gas and if you get the same issue. Some of the vids show the Tavor with some high FPS numbers (higher than UK legal) so I wonder if the FPS limit we have here is causing a lack of performance in how the parts are gelling together. Just thinking if it was designed to run on a more powerful setup and it's been in turn handicapped for our market resulting in poor performance etc... not sure if that makes any sense - I can try and reword it.  :lol:


When this was mine I tried Red gas and didn't make any difference, that and it was running about 360+ FPS. 

 
Well guys, @Wo1f is a certified genius.

Just fitting the NPAS, without adjusting it, I now get 38rounds a mag, and no out venting of gas.

I prostrate myself to you, sir, god of gbb ????

 
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