Well, the gas ram seems to be going south in my Titan

[HYspd]

it's possible that the seal has hardened...

and if the seal is hard and the AG is stored in a cold area, it may also have shrunk slightly due the cold

if it's hard and it has shrunken, the hardening may not let it return to full size when it warms up


plastics do more weird things than a cross eyed dog as they age  ....

[56S]

Blocking the transfer port and pushing on the piston shows no leakage.  Matter of fact I expected some leakage but after about 15 seconds of continual force on the back of the piston and no change felt, I figured I was good.  Guessing during the compression stroke the seal would fit even tighter against the cylinder walls

[robert w]

does your piston have any preload? if its hitting the end of its stroke it will ruin the piston quickly . ask me how I know. I learned the hard way when I converted the big cat I used to own

[56S]

The gas ram, yes.  WAG says about 6mm?

[HYspd]

if you can set the receiver and piston up to hold about 200 pounds with the port blocked
you'll begin to get near shooting pressure in the compression chamber

N-Forcers list the red 125 at 200 pounds extended and 260 compressed


what happens is with movement and vibration the pressure
can lift edge of the seal off the bore wall once it's off it will stay off until pressure drops

given the short life time of the high pressure during the shot cycle it doesn't take much
volume to dump pressure ...isn't the law halving volume doubles pressure?...towards the high pressure end of the piston stroke the volume is pretty small so even a small leak at pressure will lower pressure considerably...

[56S]

Interesting thoughts.  I really don't believe the piston seal is my problem.  I am not a part changer type of mechanic.  I  have some time this weekend to shoot and the Titan will get a workout then chrony test again.  Who knows, if it is more accurate and the velocity stays consistant I may just keep it that way.