Silent Piston Question

[Trev140_0]

Ok, so I am sure the answer to this is buried somewhere in thousands of posts on ASC.

Here is the question.

I just rebuilt one of my AEG gear boxes and this one is a masterpiece. SO SILENT.

I really took a shit load of time and shimmed this from the motor back back on. Proper grease etc etc.

If you shoot this with a pilow over the barrel, it is nearly silent.

So here is the wierd part. I do not have a silet piston head. Just the standard piston.

So going back to my school days on pneumatics and hydraulics, is it possible there is "air spring" left in the piston when the pistion goes smashing into the cylinder head?

I am beginning to think this may be the case. My thought is when all airsoft pistons are discharged there is NOT a rock hard contact. If there is a good seal I am thinking there is an air spring effect for the last small potion of the stroke as the piston is discharging the air.

Thoughts or data ???

[BIGMEDCIN]

I have found with the perfect, or well, what I perceive as perfect, cylinder volume to barrel length with have a effect on how loud a piston slap you get.

here is my thoughts, I have put a full non port cylinder in an M-4 with an AK 455mm barrel, the sound is very low! that same cylinder with a CQB barrel 300mm is a far bit louder!

I think if your compression is done before your BB leaves the barrel! you have an buffeting effect ie: you still are pushing against an air resistance given you a cushion of sort.

Now take the shorter Barrel and the BB leaves and the piston is still accelerating, now you have no resistance since your BB is gone, open barrel no cushion and a louder slap!

I think an M-4 ported cylinder with an AK-47 length barrel would be the best starting point, you will not give up FPS but get the effect of reverse dynamics on the piston as it travels.

of course I think the end results are not earth shattering, but I have noticed a difference, I believe with better cushioning material this method would work even better.

just my findings