Can a heavy piston rob power?

[Shed tuner]

So I guess the simple answer is that a heavy piston doesn't rob power unless using extremes

But just for fun I wonder what springer has the heaviest piston, my guess is a Patriot

In a mk1&2 they are too heavy, and that lump should be thrown away. With a suitable replacement spring, it becomes nicer to shoot.
However in the long stroke Mk3, they are need to maintain piston momentum with the much higher swept volume

[TonyL]

In a mk1&2 they are too heavy, and that lump should be thrown away. With a suitable replacement spring, it becomes nicer to shoot.
However in the long stroke Mk3, they are need to maintain piston momentum with the much higher swept volume

Yep, power in my .177 HC certainly took a nose dive with that heavier item removed, John, necessitating a fair old degree of extra preload to bring the muzzle energy back up. When I next have a play, then, maybe I might refit that heavier original item?

[muzzle]

I have an after market hw80 piston, weight is 425g has a 22mm I/D Not that i use it as such

[TonyL]

I have an after market hw80 piston, weight is 425g has a 22mm I/D Not that i use it as such

That's a big 'un!

[NickG]

That is a bigun ! My pistons are usually around 150 gms