Cap keeps blowing off

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Postby chopperman » Sun Nov 19, 2006 3:46 pm

Hey, just finished my cannon and Ive been threw 2 caps in 3 shots. I am using starting fluid. Chamber is 4" by 12" and barrel is 2" by 27". Can it be that Im not closing the cap tight enough, or mabe Im using to much fluid. Anybody got ideas
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Postby Drew Rowland » Sun Nov 19, 2006 3:57 pm

What size is your cap? How far does it thread on? Is it pressure rated?

No, your not using to much fluid.
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Postby chopperman » Sun Nov 19, 2006 4:09 pm

just blew another cap. Its a cap that fits a 4" cap. It doesnt thread in all the way but I just go until it stops. Im not sure if its pressure rated.
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Postby Drew Rowland » Sun Nov 19, 2006 4:44 pm

How thick are the walls of the cap? What markings does it have on it?
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Postby chopperman » Sun Nov 19, 2006 6:09 pm

I dont know the markings on the cap, just blew the last one I had. What should I be looking for.
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Postby Mr.Plow » Sun Nov 19, 2006 6:12 pm

I've never blown one (knock on wood) so I'm therefore interested... post some pictures if you can. If you can't, find a picture of a similar one online (google image search, etc)
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Postby chopperman » Sun Nov 19, 2006 8:44 pm

this is what is blowing. It would be good for the first shot and then the next shot it blows out. The last shot I made the cap blew and made a nice hole in my sweater.

http://img295.imageshack.us/img295/1015/pvcdf5.jpg
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Postby chopperman » Sun Nov 19, 2006 8:54 pm

Here is a vid, it sucks cuz its hard to film and shoot at the same time http://www.youtube.com/watch?v=e4pjTOVDYyw
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Postby chopperman » Sun Nov 19, 2006 8:58 pm

I think the cap blew becuase I sprayed it on the threads of the cap
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Postby nicholai » Sun Nov 19, 2006 10:38 pm

It looks like the female threads on the cleanout adaptor are burned up pretty good, thats likely the problem. Ive had a few caps blow out when the female threads get worn down and burnt up but that was after 500 or so shots i think
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