Part identification?

[james]

Hi folks. I'm a newbie here.
I'm in the process of replacing some seals in my S410. I've come across a part that I can not see the purpose of.
It's the brass bottle type item inside the air cylinder. I believe it's called the "firing pot". But I'm puzzled as to what purpose it serves.
Please could somebody clarify this for me?
Thanks
James

[maddoghutty]

Has far has I know the firing pot holds the air for the anitial shot if I'm correct.

[eboswan]

There is an exploded diagram in the tech section..its on page 3

[james]

From years gone by, i'm sure my Webley Raider didn't have one?? So why is it needed now? I presumed the weight of the bolt spring, and the size of the air passage hole were the items that regulated air flow on a pcp set up. So what benefit is the firing pot?
I was going to try firing the rifle without it, but didn't want to damage anything... Does anyone have any idea what would happen if I removed this part? Just to add, I have fac air, rimfire and centrefire on my ticket, so it's not a case of trying to squeeze out a few extra fps.
Thanks.
James

[granville]

on youtube fitting a reg to 410 by robert lane may be worth a look.https://www.youtube.com/watch?v=bRNicqIzpSI

[granville]

its 2.17 minutes in to the video . it holds the firing valve in place .

[Raj]

Simple answer ...
Without the firing pot, you have the entire contents of your air tube ... at whatever pressure you have left in the tube ... trying to leave the rifle when you press the trigger and strike open the firing valve.

With a pot in place, the volume of air per shot is partially 'regulated'... e.g. about 2.5 cc in an S200. The pressure however is whatever you have left in the air tube. So, at the start of a fill, you have 2.5 cc of air at say 180 bar behind each pellet. By the time you reach the end of a useful fill you will have 2.5 cc of air at about 80 bar behind each pellet. This is because after each shot, the pin hole in the firing pot re-fills it, ready for the next shot.

When the pot is replaced by a 'regulator' this metering is controlled one step further. Besides the volume being metred, the pressure made available for each shot is also metered. So from the start of a fill to the last shot before the rifle comes 'off reg' you will have the same volume of air at the same pressure (often set at 100 bar) in your regulator available for each shot.

In conclusion, a firing pot is a cheap half way house between nothing and a regulator.

[james]

Oh! Now I see. Thanks for the replies folks.
The position i'm in, is that I have an S410, that I've had for some years, and it's a great gun. However, I also have fac air on my ticket. I was going to sell my non fac S410 to fund an fac air rifle. But as I only need it around some spread out barns, with my truck near by which would have my dive bottle in.. I only need around 30 fac rated shots. Around 30 ft/lb would be good. Now i'd really like to keep my old trusty S410, and wondered if I could just buy the fac rated parts from a dealer. And if possible also buy a regulator for it. Granted I do not know the names of all the parts, but I have stripped and rebuild my S410 several times for servicing the o rings. Is it possible to buy the fac parts I need, along with a regulator, to take out the power curve? Then put the rifle on my ticket? I gather once on ticket, it stays on ticket. Which is fine by me. I've watched some video's on youtube, where a a firing pot extension is fitted. Would this form part of the fac kit?
Thanks.

[james]

Apologies Granville, I've just read your post. I'll have a look.
Thanks.

[Blackbaronfish]

Without the pot you are totally relying on the hammer spring to meter the air .
You may find that your shot count goes down due to wasting air.

BBF