Quote:
Originally Posted by Stealth
If you're testing the compression by moving the piston slowly in and out of the cylinder, it'll give the illusion of having bad compression.
Most people test their compression by how well it seals when the piston is slow-moving, but really the piston o-ring expands quite a bit when under pressure. What Lonex has done here has used an o-ring that APPEARS to be poor-sealing but actually seals quite well at mechbox operating speed. To test this you need to force the piston into the cylinder very quickly. The plus side of using this size o-ring is that there is very little excess resistance that would otherwise slow down ROF and decrease FPS.
We swapped out the o-ring with an SHS one and while the static compression improved drastically, we actually got LOWER FPS and ROF than before - presumably due to excess o-ring resistance.
The 440fps number was obtained with the Lonex piston o-ring.
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Thanks for the heads-up, I'll try it today