Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 75 users online :: 6 registered, 0 hidden and 69 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [Bot], farcticox1, Google [Bot], Google Adsense [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Air Rifle Piston head Question

All non-spudgun related discussion goes here such as projects, theories, serious questions, etc. All "off-topic" posts (aka useless posting, determined by moderators) will be removed.
Sponsored 
  • Author
    Message

Air Rifle Piston head Question

Unread postAuthor: ghostman01 » Tue Jul 08, 2008 8:50 am

Hey guys,
I just upgraded my spring out of my air rifle and the piston looks like it could be replaced. So i took the old one off the top of the piston and saw that it had a sort of rivet shape to it, so i cut out some bike inner tube using a piece of pipe that is the same as the chamber and put it on the top of the piston and it went on in such a way that it was a cup shape. So i put it in the gun and then the spring and i put it back together and the power was just about the same as before ? Can some one please tell me an easy way to make a effective piston that has 100% seal and will work well !
the attached picture show what i have done
thanks
  • 0

Attachments
piston.jpg
piston.jpg (12.38 KiB) Viewed 2675 times
Last edited by ghostman01 on Tue Jul 08, 2008 9:11 am, edited 1 time in total.
Image
Ultimateforum
I have 27 different kinds of weapons in my home, do not attempt to trespass........!
User avatar
ghostman01
Major
Major
 
Posts: 372
Joined: Fri Nov 23, 2007 9:15 am
Reputation: 0

Unread postAuthor: Ragnarok » Tue Jul 08, 2008 9:04 am

In reality, the truth may be that it doesn't need replacing - they tend to get worn down a little, and because they slowly get worn to just the right size, it makes a very good seal. Their shape also tends to ensure that they get forces out against the walls to really give the best seal.

It's part of why spring air rifles need to get run in a bit to get to their peak power.

If you really need a new seal, consider buying a high quality one like from a brand like Maccari - it'll save you a lot of grief.
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: ghostman01 » Tue Jul 08, 2008 9:14 am

So with my new rubber thingo that i put on will work better than the old one ? or should the old one still work well?
  • 0

Image
Ultimateforum
I have 27 different kinds of weapons in my home, do not attempt to trespass........!
User avatar
ghostman01
Major
Major
 
Posts: 372
Joined: Fri Nov 23, 2007 9:15 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Tue Jul 08, 2008 10:14 am

That will wear out very quicky. Older spring piston rifles tend to have leather washers soaken in oil as a seal, while modern ones have a synthetic seal made of nylon, PTFE or similar. I suggest you buy a proper one, what make and model is your rifle?

Also, do you have a true scientific method of determining that the power is the same?
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: Darkside 6ix » Tue Jul 08, 2008 11:11 am

Are you guys talking about a pump action pellet gun? Ive had mine for many years and the piston has never worn out on it.
  • 0

"Dude, if all of the people on spudfiles got together with all of their cannons, we could take over china"
User avatar
Darkside 6ix
1st Lieutenant
1st Lieutenant
 
Posts: 298
Joined: Sun Apr 30, 2006 6:53 am
Location: United States
Reputation: 0

Unread postAuthor: Ragnarok » Tue Jul 08, 2008 12:53 pm

pvcpsyco wrote:Are you guys talking about a pump action pellet gun? Ive had mine for many years and the piston has never worn out on it.

No, we're talking about spring piston air rifles.

ajdevi92 wrote:or should the old one still work well?

The old one should still be working reasonably, although you might see a small improvement if you get an aftermarket seal.

Also, JSR has a point, how are you determining the power is the same?
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: ghostman01 » Tue Jul 08, 2008 9:03 pm

lol by shooting a food can and seeing how far the dents go in :D its very scientific

JSR : its an old slavia 618. every were ive gone on the internet and in a car no ones stocks any parts for it. I had to go to a spring making company to get a new spring made up
  • 0

Image
Ultimateforum
I have 27 different kinds of weapons in my home, do not attempt to trespass........!
User avatar
ghostman01
Major
Major
 
Posts: 372
Joined: Fri Nov 23, 2007 9:15 am
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: Gippeto » Wed Jul 09, 2008 12:24 am

Interesting! 8)

I have a couple of old Slavia's in the cabinet, a 622 and a 624. (.22 and .177)

Both use leather seals on the piston.

Possibly a cobbler might be able to help you make a new seal? Or at least provide some thick leather for you.

Edit: Soak your new leather seal in Neats Foot Oil overnight before you install it. This will make it "supple".
  • 0

"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
Gippeto
Donating Member
Donating Member
 
Posts: 2393
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Unread postAuthor: ghostman01 » Wed Jul 09, 2008 3:28 am

ok i might try to find some thick leather, ive only got thin stuff and ive tried layering it and that doesnt work. Today i sanded down a piece of rubber and put that in there, execpt i made it about 0.3mm to small so ill make another soon. Im also going to try and find some soft rubber or thick neoprene or something like that. Every where ive looked i cant find a single spare replacement part for it.
  • 0

Image
Ultimateforum
I have 27 different kinds of weapons in my home, do not attempt to trespass........!
User avatar
ghostman01
Major
Major
 
Posts: 372
Joined: Fri Nov 23, 2007 9:15 am
Reputation: 0

Unread postAuthor: ghostman01 » Thu Jul 10, 2008 1:46 am

Well i made a piston head out of a solid piece of rubber and boy is this powerful !! I cant get an exact reading but using Ant's home made chrono method its saying im getting 800+ fps outta it ???? surely that cant be right. Every one else that ive seen on the internet that reconditioned their slavia 618 could only manage 300- 400 fps , oh well is powerful and accurate.

Another question is, can i make a piston outta dried sicaflex, you know the stuff you stick new windows in cars with. Ive got a big block of dried up stuff, That could work ?

double post i know !
  • 0

Image
Ultimateforum
I have 27 different kinds of weapons in my home, do not attempt to trespass........!
User avatar
ghostman01
Major
Major
 
Posts: 372
Joined: Fri Nov 23, 2007 9:15 am
Reputation: 0

Return to Non-Spudgun Related Discussion

Who is online

Registered users: Bing [Bot], farcticox1, Google [Bot], Google Adsense [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'