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Thomme
Sergeant
USA
Member Since: |
 Posted - 02/01/2006 : 11:24:43 PM
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I was wondering if anyone can explain the barrel suck phenomenon to me. I'm currently putting an M90 spring and a 3/4 type cylinder (which I believe is made for M4's & XM117E2's) into an MP5K with a 141mm barrel (soon to be around 300 mm) and was wondering if this will cause barrel suck.
Also, I know it has to do with the volume of the cylinder being more or less than the barrel, but, I don't know which way it goes or how it would affect certain guns. |
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d_thedj
Sergeant
Member Since: 07/04/2005 |
Posted - 02/01/2006 : 11:37:48 PM
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If the volume of the barrel is more than the volume of the cylinder, you may experience "Barrel Suck".
There needs to be more volume in the cylinder than the barrel. |
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ALASTOR
Private
USA
Member Since: 01/02/2006 |
Posted - 02/02/2006 : 7:27:52 PM
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If you are wanting to know what it is and why you should avoid it, then your answer is:
When the piston moves forward, it forces air through the inner barrel and pushes your BB. If cylinder is not big enough, then you won't have enough air to push your BB through the barrel. The BB will start to be sucked back and will reduce your velocity and accuracy a lot. Look at this diagram:
__________
|| ___________________________________
||--- ()
||---_____________()____________________
----------/
___
___ = cylinder
||| = piston
_____ = barrel
()
()= BB
--- = air nozzle
---
If the BB is not out of the barrel by the time the piston hits the cylinder head, the BB will be sucked.
The best real life example is if you fill a milk jug with water and dump it out, you can see the milk jug get sucked inwards.
Its also kind of like when you put your finger over the hole in a syringe and you try to pull out the pump.
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Thomme
Sergeant
USA
Member Since: 07/08/2005 |
Posted - 02/02/2006 : 8:36:10 PM
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| ok, thanks guys, very helpful |
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Barrel Suck?
