Wont fire...

[Pyro_Boy]

Ok so i build my first cannon combustion tryed it and it worked=]

Shot twice then when i tryed third it wouldnt light the propellant (yes spark is working)

But when i open the cleanout and spark it lights and flames come out the back.

Why wont it light when cap is on.

Thanks pyro

[Torch]

1. Too little or to much fuel
2. You need to vent it after each shot, adding a chamber fan will help with this.

[Pyro_Boy]

Thank you but each shot was at different time so i think it would be option 1 how much spray do you reccomend using axe right now.

[Torch]

Just depends on your chamber. Expermenting is the best thing to do really.

[Pyro_Boy]

Thanks you have been helpful

[Torch]

No problem! Good luck with it.

[SquishY]

I was playing around with my new combustion today(first one ive even done anything with in over a year) and I think my chamber is way to big. I used 2" and 3" ABS with all the proper ends and such, the chamber from reducer to screw on cap thingy is 8 1/4" inches(didn's make measurements when it was made just picked a spot and cut) with a 33" barrel. The only good shot I got blew my piezo out and my barrel off but the duct-tape and sand ball went about 500'.
Not hijacking the thread but mine does the not firing thing to so eh.

[Torch]

Expermenting is the best thing to do really.

You need to just find the right fuel mixture methinks. But im not really sure..