Paul68,We can take a simplified view of it so that it is more clear:You have a 6 inch long cylinder with a piston inside it. There is 1 inch of head space at the bottom of the stroke. That is a lot but it is just for demonstration. You manually push the piston until it comes to within 2 inches of the bottom, resulting in a 6 inch column of air squeezed into a 2 inch space. It took a certain amount of energy to do that. If you input some additional energy, you can further compress that column of air down to 1 inch. At that point, no more energy can be accepted. The piston is bottomed out and the head space contains all of the compressed air.If you use a spring to launch that piston down the tube, all of the energy in the spring wants to go somewhere. Once the spring energy is high enough to bottom out the piston, you have reached the limit. Any excess energy just ends up as energy transferred into smashing the seal and jarring the rifle.
Thanks. I hadn't taken into account the need for extra volume to compensate for compression itself. This would explain the ability of PCP's to produce more power, because they aren't limited by a single compression of a small air volume. In other words, we are limited in springers by the PSI that can be produced with a certain volume of air.
another reason to use only nitrogen is that it dosent expand with heat !
You wrote (I tested a red label gas spring in my TF99) have you tried a yellow in a tf 99.do you think it is OK just to Strong for the 99? can you tell the size me of the ram you ordered.sorry there is just so much I dont know. is there perhaps a really strong spring that would be better?I asking all this because I now have a 99. nice gun but my XL has just about ruined me.I really like power! I think the 99 can be up power some however I do want to learn to do this the right way.So any help you would or can give would greatly appreciated.-- I will pass it on