GTA

All Springer/NP/PCP Air Gun Discussion General => European/Asian Air Gun Gates => German AirGun Gate => Topic started by: spevie on October 30, 2020, 05:06:42 PM

Title: Too tight piston seal?
Post by: spevie on October 30, 2020, 05:06:42 PM

What happens if the piston seal is too tight? Is the gun underpowered, or if REALLY too tight, will not fire at all?

Title: Re: Too tight piston seal?
Post by: Mark 611 on October 30, 2020, 05:15:02 PM

It'll shoot but you will have lost alot of power velocity wise! ;)

Title: Re: Too tight piston seal?
Post by: Motorhead on October 30, 2020, 05:15:30 PM

Correct  ??? ???

Title: Re: Too tight piston seal?
Post by: spevie on October 30, 2020, 07:16:13 PM

Thanks to you both. The AG, an early Walther LG55 was a worn club gun. The replacement piston seal (JG, only source I know of) was 0.4mm oversized, everything else about the gun somewhat worn...with the correct seal, it's quite accurate, smooth: nice antique match rifle!

Title: Re: Too tight piston seal?
Post by: nced on October 30, 2020, 07:23:51 PM

Quote from: spevie on October 30, 2020, 05:06:42 PM

What happens if the piston seal is too tight? Is the gun underpowered, or if REALLY too tight, will not fire at all?

"Is the gun underpowered"
Yep

"if REALLY too tight, will not fire at all?"
Possible but not probable.

IMHO, there is more of a possibility that the gun might be damaged if the piston seal is TOO LOOSE!

Title: Re: Too tight piston seal?
Post by: Roadworthy on October 30, 2020, 07:46:21 PM

Yes, the seal being too tight can (probably will) cost you some velocity.  It can also set up a vibration as it travels through the compression tube.  You are unlikely to feel it due to everything else going on but it can manifest itself in slight variations in your groups.