Quote:
Originally Posted by m102404
Sorry....maybe it's just me. How does the spring pressure inside the mag cause air-leak/compression issue type symptoms?
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Many ways.
The bbs could press up against the nozzle hard enough to cause air leaks between the nozzle and cylinder head. Basically, like a prying motion.
The bbs might press up hard enough that the nozzle doesn't seat completely forward and gets caught on the upward force of the bbs. Hence, why you increase the strength of the tappet spring to pull the nozzle back into proper position. I believe this is the symptom and cure Maciek is referencing and honestly makes the most sense in this situation. As the tension in the mag goes down, the nozzle moves more freely given its current tappet spring tension. As the nozzle moves more freely, rounds load better and the nozzle seats properly.
In two piece cylinder head setups the nozzle and cylinder head may not leak under the pressure, but the pressure on the nozzle may stress the two piece cylinder head where the nozzle meets the head (probably not very common) or where the cylinder head meets the cylinder (can also happen in 1 piece). This is probably fairly rare unless your cylinder head/cylinder is really poor quality
I notice that in tappet plates, there is play in where the nozzle sits. In the standard design, there are many areas for leakage in the interactions between just the nozzle, cylinder head and hop up.
The fact of the matter is that the nozzle not only operates as a means to deliver compressed air to the bb but also to restrict bbs from entering the chamber. As a result, the entire load of the rest of the mag sits against the nozzle. If you release a fully loaded mid cap, you know how much force this has (hint: use eye pro). All that pressure on one small part that really isn't completely secure itself. That's where these issues arise from.
I believe Maciek has a good write up about this issue on his SIG and its very long nozzle.
(By the way, I know you probably know most of this, the length of this write up was for any other people who find this thread and want more info.)
Cheers!