Firepiston

[Tailgunner]

If you've ever wondered why some folks advise a slow/steady pumping on your 2289/1322 or other pumper guns of the same type......... or why, after a few shots at 30 pumps your 2289 loses power..........this might help to explain. The firepiston temperatures, apparently, can reach 800F. Your 2289 won't be that high..........but it'll be 'up there' high enough to wreck a few cups or 'O' rings.

http://firepiston.com/

Cheers - Gus

[killercrow]

hey, where did you find this info? can you elaborate a little? i think im having this problem with a custom piston i built...

[Tailgunner]

Awww....rats..........I can't find the place where I found this info. Anyway - just follow the link on the first post and you can see the item in action. It apparently doesn't take much of a stroke to hit real high temperatures.

[ABshooter]

Ha. Ha. Ha.

[IanC]

Yes this does happen in spring airguns due to the massive compression that occurs and yes in that split second it can reach temps of over 800F.
As we all know with the wrong lube you get deisiling.

I dont think and have real doubts that this happens in pump guns though.
You are most likely applying more pressure than your cup can handle.

[Tailgunner]

Here's another link with a little more historical info..........

http://www.onagocag.com/piston.html