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4" Ball Valve vs. Cleanout ?

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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4" Ball Valve vs. Cleanout ?

Unread postAuthor: Tatersalad2000 » Mon Aug 10, 2009 12:32 pm

Hi, I'm new around here. Got a question.

Screwing the cleanout off/on over and over can get old.

Has anyone tried a 4" Ball Valve as an alternative?

Maybe they can't handle the pressure? I've done some searching and haven't seen anything mentioning it.

I'm not worried about the cost if it improves the fun.

Thanks
-Chris
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Unread postAuthor: Moonbogg » Mon Aug 10, 2009 12:42 pm

Whoa, check out the combustion cannon showcase. Your either going to get stomped or ignored for that question, so I figured i'd calmly direct you to the infinite examples in the cannon showcases.
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Unread postAuthor: explsvcookie257 » Mon Aug 10, 2009 12:43 pm

it will be really hard to open if its plastic I would just get a threaded bushing and get a small 1" ball valve and a fan to push the fumes out.
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Unread postAuthor: lukemc » Mon Aug 10, 2009 12:43 pm

ive seen plenty of cannons do this successfully. If you have a fan in it and fuel injection then 4" is way over kill. you only need something that will allow air to vent.
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Unread postAuthor: theBOOM » Mon Aug 10, 2009 12:46 pm

If you dont care about the price you might wanna invest in sgort's pop vent ... its extremely easy and if you buy some other things you can even have a semi auto combustion gun :P...just a thought..
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Unread postAuthor: Tatersalad2000 » Mon Aug 10, 2009 1:23 pm

I'm probably not explaining this right....

I didn't see any combustable cannons in the showcase that use a 4" ball valve rather than a cleanout to spray the fuel into.

I'm just looking to make something simple. No fan or fuel injection.

I made simple combustion cannon ten years ago that worked great.

The only thing that was annoying was eventually the threads wore out on the cleanout. They'd get crossthreaded...sticky from the aquanet...etc.

I'm just asking if anyone has substituted a 4" ball valve rather than the 4" cleanout.

Seems like turning the valve...spraying in the fuel...and turning it back might be easier than unscrewing/screwing on the cleanout cap every shot.

You guys follow me?
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Unread postAuthor: Moonbogg » Mon Aug 10, 2009 1:28 pm

PVC ball valved are very hard to open. A 4" would require some serious effort to open every time. You will wish you stuck with the cleanout. So no, pople don't use 4" valves for spray and pray spud guns. Next question?
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Unread postAuthor: Tatersalad2000 » Mon Aug 10, 2009 1:41 pm

Okay thanks man...I appreciate your help.

I went to homo depot, lowes, and ace, and all they had was the "cellulose core" schedule 40 stuff.

I read that stuff is no good, right? It sure seemed kinda light and brittle to me.

....i'm scouting out plumbing supply stores now.

I'd just buy one online but I want it for a camping trip this weekend.
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Unread postAuthor: c11man » Mon Aug 10, 2009 2:07 pm

if your making just your standard combustion then cellualar core is fine. advancesd combustions with mapp, spark strip, fan, and burstdisks is pretty iffy with cellular core
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Unread postAuthor: Technician1002 » Mon Aug 10, 2009 2:22 pm

c11man wrote:if your making just your standard combustion then cellualar core is fine. advancesd combustions with mapp, spark strip, fan, and burstdisks is pretty iffy with cellular core


ABS is more impact resistant than PVC. Avoid the PVC cellular core pipe.
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Unread postAuthor: c11man » Mon Aug 10, 2009 2:23 pm

oh i never thought of abs....... my brain is fried! yeah if you cant get solid pvc abs is better
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Unread postAuthor: Tatersalad2000 » Mon Aug 10, 2009 3:06 pm

Roger that. I'll just get the black ABS cellolose since that's all I can find.

That saves me a lot of hassle riding around. Thanks everyone.
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Unread postAuthor: MrCrowley » Mon Aug 10, 2009 3:45 pm

But remember for when you advance to pneumatic, stick to the pressure rated stuff. Most likely you wont find much, if any, pressure rated ABS though, so give with the PVC.

If you're using fuel injection for this cannon, I would recommend pressure rated materials also, but there have been fuel metered combustions made from ABS cellcore (although one did fail because of a threaded brass fitting through a single layer of ABS).
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Unread postAuthor: Tatersalad2000 » Mon Aug 10, 2009 5:57 pm

It's been a while but for "safety" I remember making it a habit to not screw on the cleanout too tight.

One time I was experimenting with gasoline and the cleanout blew off hitting the plastic lawnchair right behind me making a perfect round hole in the back of it.

After that people listened when I told them not to stand behind me when firing.

But I was relieved that the weakest point were the threads on the cleanout rather than blowing up on my hip.

That was 12-13 years ago. Nowadays I can just read and learn from everyone else's mistakes. :wink:
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Unread postAuthor: elitesniper » Mon Aug 10, 2009 8:18 pm

I went to homo depot, lowes, and ace, and all they had was the "cellulose core" schedule 40 stuff.

what do they sell there? :lol:
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