Can I preload a drop in gas ram?

[bighit]

If i remember right ,pre loading will not do much .


From another forum

The NP has it's full pressure from the moment you start cocking it, versus a spring which is more "progressive" build up to full pressure. The same thing happens, in reverse, when fired. While the spring may only have a percentage of it's max. force left during the end of it's stroke, the NP will still be exerting full value throughout it's stroke. Adding spacers won't gain, with the NP powerplant, and as posted above, slamming the piston into the breech will destroy your piston seal, and I'll bet it'll be a violent shooting cycle. Good Question!


NP = Nitro piston

[TonyL]

In view of the above then, Pete, maybe just test with some different pellets and, if you like the way it shoots anyway, leave as is?

[look no hands]

In view of the above then, Pete, maybe just test with some different pellets and, if you like the way it shoots anyway, leave as is?

I will most probably leave it as is, as like I said I'm not overly worried about the power to much but it would have been nice to have it around the 11ftp mark, I expect if the rifle was .22 then it would be around the 11 mark, I may try turning the ram around to see what happens but it has a proper machined end piece that the main ram body slots into and that has the rear pin and screw going into it at the end of the cylinder, it's a shame you can't get the Quickshot rams, pistons and triggers over here as I recon they would transform Gamo rifles.

Pete

[TonyL]

Maybe a bit of a pain to try in the other way round then, Pete?

What pellets have you power tested with?

And are you happy with the overall feel, cycle and accuracy?

[look no hands]

Maybe a bit of a pain to try in the other way round then, Pete?

What pellets have you power tested with?

And are you happy with the overall feel, cycle and accuracy?

I expect I'd have to pack the ram body out and it will rattle around inside the piston, Quickshot who make the ram also make a special piston which is thinner (the rams body fits inside perfectly with no slack) than the Gamo piston and has bearings and is lighter as well.

I've only tested it with the usual 'go to' AA fields as that's what it's normally the most accurate with, I've not tested the accuracy yet but it shoots pretty nice (just as good as the WW kit when fitted).

Pete

[look no hands]

Tony clear your inbox please.

Pete

[TonyL]

Space in inbox now, Pete.

If your Brocock holds a special place in your heart, Pete, maybe worth pursuing other options.

My Gamo, however, will only be getting tweaked on a budget in keeping with its overall demeanor. It does actually impress in quite a few areas and doesn't seem pellet fussy and it's clobbered the 75 yards Quigley Bucket at The Bash a fair few times. Firing cycle, as previously mentioned, is very mild.

Quickie question, if you know.....if fitting a piston sleeve, can it come to the back of the piston or would this interfere with the sear notch? I'm sure this has been asked on the forum in the past, but can't remember the outcome.

If the finish on the standard guide is good, as per above, I'll most likely just go down the suitable spring and top hat route.

[Turnup]

If i remember right ,pre loading will not do much .


From another forum

The NP has it's full pressure from the moment you start cocking it, versus a spring which is more "progressive" build up to full pressure. The same thing happens, in reverse, when fired. While the spring may only have a percentage of it's max. force left during the end of it's stroke, the NP will still be exerting full value throughout it's stroke. Adding spacers won't gain, with the NP powerplant, and as posted above, slamming the piston into the breech will destroy your piston seal, and I'll bet it'll be a violent shooting cycle. Good Question!


NP = Nitro piston

Agree that a gas ram will have in effect a degree of pre-load already since even when fully extended there is pressure in there, but as the ram is compressed it must follow that the internal pressure, and hence the "spring" force" will rise further. So Pre-load will increase the stored energy, but it is far from clear if that will be beneficial or detrimental.