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The spring, gears, and trigger in an airsoft electronic gun (AEG) are all mechanical parts. They either work or don't work. Very easy to tell. But the cylinder, piston, and nozzle are pneumatic parts, which is "technology that deals with the study and application of pressurized gas to produce mechanical motion" (Wikipedia quote). Pneumatic parts can move fine mechanically, but do not provide any compression. That's when you have compression leaks. I am going to explain how to deal with cylinder compression leaks, which is quite easy to deal with once you understand it.
First, make sure your cylinder head is sealed to the cylinder. Once you have the cylinder head on the cylinder, it should be rather difficult to move it, giving it a good seal. Then test it, by putting a finger on the nozzle and blowing into the cylinder. It should be difficult to blow into the cylinder. Three ways to improve the cylinder head to cylinder seal: 1) Replace the o-ring; 2) Upgrade to a cylinder head with double o-ring; 3) Upgrade to an one piece cylinder and cylinder head. The dimensions for the o-rings are linked in the "TrackBack" section below.
Once you are happy with the cylinder head seal, move onto the air nozzle seal. You should upgraded to an air seal nozzle, if you don't already have one. The air seal nozzle has a o-ring in the air nozzle that seals itself to the cylinder head nozzle. With the air seal nozzle on the cylinder head, perform the same test you did before; finger on the air nozzle hole and blow into the cylinder.
Now it's time to seal the AEG piston head to the cylinder. Put a finger over the air nozzle. Push the piston into the cylinder. As soon as it has passed the ported hole (if your cylinder is ported), you should feel resistance. At sufficient speed, which is not very fast, you should not be able to push the piston into the cylinder against the resistance. If there is no resistance or very little resistance, you have a compression leak. That usually mean you have a bad o-ring or the incorrect o-ring. Replace it.
After you have taken care of all the leaks explained in this thread, you will have good compression. In fact, I would say you have maximized the compression in your cylinder. Now would be the time to remove the compression leaks from the rest of your gun. Take a look at the "AEG Potential Areas for Compression Leaks" article in the "TrackBack" section below.
Jake
Thu, 07 Aug 2014 00:53:28 +0400
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Title: AEG Potential Areas for Compression Leaks
Weblog: Airsoft SpecOps
Excerpt: The airsoft electronic gun (AEG) is really not a very complicated device. It basically pushes the BB out of the muzzle with a puff of air. How fast the AEG shoots depends on the strength of the air puff. The biggest culprit of FPS loss on an AEG is air leak, which weakens the puff of air. Here are s . . .
Tracked: Thu, 07 Aug 2014 00:47:50 +0400
Title: O-Ring for AEG Cylinder Head
Weblog: Airsoft SpecOps
Excerpt: The o-ring for an airsoft electronic gun (AEG) cylinder head is the same as the AEG piston head. It is #14, which is 15/16 In. OD x 3/4 In. ID x 3/32 In. Wall. It is the same dimensions a s the #214 o-rings being sold at Home Depot. Be sure you match all three dimensions listed above.
Tracked: Thu, 07 Aug 2014 00:48:00 +0400
Title: O-Ring for AEG Piston Head
Weblog: Airsoft SpecOps
Excerpt: Everyone claims the o-ring for airsoft gearbox piston head is #14. But it's really hard to find o-rings based on that identification. Lowes doesn't carry o-rings based on that designation. Home Depot's web site shows that it carry #14 o-rings. But when I get there, I didn't see any o-rings with the . . .
Tracked: Thu, 07 Aug 2014 00:48:07 +0400
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