Hangtight Posted February 4, 2018 Share Posted February 4, 2018 Does anyone else have any experience with this? In two different guns I've reversed a non linear spring so the more densely coiled end is inside the piston and seen a 7-10 fps increase. Fit it back the other way and the fps reverts back to what it was. I'm currently in 'intense discussion' with various people over the effect with them insisting turning the spring around doesn't make a difference, and myself trying to figure out what it is I'm measuring... So here's my thinking. A non linear spring (M100) weighs 12.6g. This is split about 55:45 one end to the other which means the more densely coiled end is about 1g heavier. This means you have effectively increased the piston weight by 1g by reversing the spring. From messing around with piston weights, depending on the original weight and the BB weight, increasing the piston mass by around 1g can give an fps increase of about the same amount as turning the spring around. Am I kidding myself, or am I heading in the right direction with this? Link to comment Share on other sites More sharing options...
Supporters Prisce Posted February 4, 2018 Supporters Share Posted February 4, 2018 Or is it that the tightly wound coils hold tension better? So if they are in the piston they deliver said tension quicker, rather than slower when on the spring guide?(longer distance to travel- initial inertia ) Link to comment Share on other sites More sharing options...
Davegolf Posted February 4, 2018 Share Posted February 4, 2018 There must be more important things in life?? No one wants to go to bed with that universe anomaly in their head on a sunday evening! Just use a linear spring, tell yourself you never found this, and sleep easy Hangtight x Link to comment Share on other sites More sharing options...
Hangtight Posted February 4, 2018 Author Share Posted February 4, 2018 The tight would coils are easier to compress, but regardless of what end of the spring they're at the force on then is the same, as is the force acting on the piston. Link to comment Share on other sites More sharing options...
Hangtight Posted February 4, 2018 Author Share Posted February 4, 2018 Got to occupy my mind somehow during long, boring shifts. Link to comment Share on other sites More sharing options...
Mostly Retired Moderators L3wisD Posted February 4, 2018 Mostly Retired Moderators Share Posted February 4, 2018 I once asked @Sitting Duck this question before installing my M100. This was his response: Quote Irregular springs -tight coils at one end (and sometimes in middle too) It is "supposed" to go tighter coils at the back as this is supposed to help it start retraction easier with looser coils up by nozzle It will vary slightly if you fit the spring the other way but not a massive amount I have found If you fit spring the wrong way - tighter coils up towards cylinder head/nozzle you should find the fps increases by about 10fps I have tried a few irregular cheapo stock springs and this is myfindings in a quick change APS UAR gun - quickest spring change AEG I know Guarder springs SP100 = a M110 or they rated the Guarder's using 0.25's they say a guns fps on a 101% M100 or 328fps will vary longer barrel produces 350 whilst mp5k's produce 300fps piston bearings/spacers & bearing spring guide/stock guide AOE All this will effect the final fps results Hence you can can get 75 fps difference in 2 very very different length guns depending on other factors above that could compress spring more/less Hence you choose m110 for short guns & m95 say for L85 510mm barrel or AK47 455mm barrel as a rough guide only due to creep (all seals being equal/perfect) soz - waffling yeah tighter coils to the rear of the gearbox if it is a bit low you can reverse it to gain about 10fps hope this helps The oracle has spoken! Link to comment Share on other sites More sharing options...
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