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Quick Question on Combustion design...

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Quick Question on Combustion design...

Unread postAuthor: octane89 » Mon Dec 03, 2007 12:02 pm

I seen a lot of advanced combustion cannons, and I have a lot of parts (probably enough to make one). But I noticed that the reducers are DWV-is that fine or do I need to find parts that are rated for some pressure?
I just want to double check, I don't need to blow up a tank thats next to my head.
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Unread postAuthor: Fnord » Mon Dec 03, 2007 12:08 pm

It'll be fine. Wear safety glasses though, especially if you're using metered propane.
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Unread postAuthor: octane89 » Mon Dec 03, 2007 12:09 pm

I was considering using MAPP. I searched and read about the 4.6% mix and that on it already. I built it in my head before anything.
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Unread postAuthor: gwoloshyn » Mon Dec 03, 2007 1:20 pm

what if your whole cannon is dwv, but constructed properly, can i still use metered propane?
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Unread postAuthor: psycix » Mon Dec 03, 2007 1:40 pm

You can, but you are NOT safe.
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Unread postAuthor: BigGrib » Mon Dec 03, 2007 2:06 pm

abs reducers are weak you should use a coupler bushing set up
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Yea, that's definitely going to get you at least a tazer.

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Unread postAuthor: gwoloshyn » Mon Dec 03, 2007 6:38 pm

How likely is it to blow up..?
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Unread postAuthor: sandman » Mon Dec 03, 2007 6:42 pm

it doesn't mater how likely it will blow if, if it does your screwed so it only takes that 1 time.
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Unread postAuthor: BigGrib » Mon Dec 03, 2007 7:08 pm

but even that one time the abs reducer is only gonna split at the seam due to the way abs is extruded, but still you dont want the $hit scared out of you when that weak recuder goes boom, and you realize that you should have gone with a coupler and bushing setup
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Yea, that's definitely going to get you at least a tazer.

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Unread postAuthor: TurboSuper » Mon Dec 03, 2007 7:27 pm

ABS is far better than PVC as far as DWV pipe is concerned, but they're both not rated for pressure (I saw a rating of 50 PSI on some DWV once, though).
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Unread postAuthor: sandman » Mon Dec 03, 2007 7:30 pm

BigGrib wrote:but even that one time the abs reducer is only gonna split at the seam due to the way abs is extruded, but still you dont want the $hit scared out of you when that weak recuder goes boom, and you realize that you should have gone with a coupler and bushing setup

he never said he was using ABS, but i would suggest it if you must go DWV
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Unread postAuthor: *5*STAR*GENERAL* » Mon Dec 03, 2007 8:26 pm

yeah its best to get pressure rated becuase, then the spark ignites ther is and explosion in the chaber and after a while it may start to crack trust me cracks with propane is noooo god> 8)
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Unread postAuthor: spudgunnerwryyyyy » Mon Dec 03, 2007 8:30 pm

Poster above has no idea what he is talking about. Combustion abs dwv is safe with propane.
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Unread postAuthor: gwoloshyn » Mon Dec 03, 2007 9:22 pm

*5*STAR*GENERAL* wrote:yeah its best to get pressure rated becuase, then the spark ignites ther is and explosion in the chaber and after a while it may start to crack trust me cracks with propane is noooo god> 8)


Your a moron.
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Unread postAuthor: octane89 » Mon Dec 03, 2007 9:31 pm

5 star general-You're a new member so its, tough to take your word without a good reputation on here. And please check your grammer next time.
Anyways, propane is fine to use with abs and dwv then...

example: First is a DWV and second is an ABS
http://www.spudfiles.com/forums/the-bes ... 11674.html
http://www.spudfiles.com/forums/mapp-in ... t7396.html


How about using MAPP gas instead? Any other problems that I wouldn't encounter with propane? (That's besides the 4.6 mix and 94psi tank pressure)
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