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Question about hooking up a propane meter

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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Question about hooking up a propane meter

Unread postAuthor: MisterSteve124 » Mon Nov 06, 2006 6:31 pm

when I attach the meter to the chamber with the elbow do I have to use a tap/die or whatever when the elbow goes into the chamber or can I just drill the hole a little smaller and screw it in by hand to have the threads dig into the pvc? So do I need a tap/die? Has anyone ever done it without a tap/die? Please if anyone can answere these questions I would appreciate your help because I am hoping to go to Lowe's tonight.

P.S. Does anyone know if Lowe's carries Pressure rated pvc fittings for 3 inch pipe?
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Unread postAuthor: spudzinger » Mon Nov 06, 2006 6:46 pm

From what little I know about plumbing, but more so I know this from just drilling pilot holes. The pilot hole shole be about the size of the pipe without the threads. Along with some plumbers tape it should work, I think. Also, how thick is the pipe, because that could seriously affect how it would work. Hope this helps, although it might not at all.
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Unread postAuthor: MisterSteve124 » Mon Nov 06, 2006 8:28 pm

Yeah thats what I was thinking but I just want someone to tell me if it will work for sure.
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Unread postAuthor: SpudStuff » Mon Nov 06, 2006 9:09 pm

It is HIGHLY reccomended you tap. If not you can very carefully drill a super streight 1/2" hole for 1/4" pipe. Use no tape the first time threading it in, then remove it and use tape. this will cut very shallow threads.
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Unread postAuthor: MisterSteve124 » Mon Nov 06, 2006 10:34 pm

yeah I don't have a tap though and I don't feel like buying one. I will do that and use extra teflon and epoxy.
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Unread postAuthor: Pete Zaria » Mon Nov 06, 2006 10:42 pm

I drilled a hole about 1/8th" smaller than the threads on the elbow, and threaded it in with a monkey wrench, carefully, with 3-4 wraps of Teflon tape. Then I put some epoxy on both sides where the elbow meets the chamber to be safe. That gun has probably 500+ shots fired on it, no problems.

Just my experience.

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Pete Zaria.
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Unread postAuthor: MisterSteve124 » Mon Nov 06, 2006 10:45 pm

What do you mean you threaded it with a monkey wrench? You used the monkey wrench to tighten the elbow?
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Unread postAuthor: Pete Zaria » Mon Nov 06, 2006 10:46 pm

Yep. Started it by hand for the first 1-2 turns, then used a big wrench (probably not actually a monkey wrench, more like a crescent wrench) to screw it in until the elbow part met the chamber.

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Last edited by Pete Zaria on Mon Nov 06, 2006 10:56 pm, edited 1 time in total.
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Unread postAuthor: MisterSteve124 » Mon Nov 06, 2006 10:53 pm

Yeah thanks for the advice that's probably what I'll end up doing once I get all the parts. It is pretty confusing looking for all those peices on a huge wall filled with hundreds of different fittings.
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Unread postAuthor: mark.f » Tue Nov 07, 2006 10:25 am

I used a 7/16" bit for my first cannon, tapping a 1/4" MNPT x 1/4" hose barb adapter into a sprinkler valve. I figured since that's the drill size they use for 1/4" NPT taps, it would work with the adapter. It was a little difficult to get started, but eventually I got it threaded good.

If you want to try just drilling a hole, go ahead. If you screw up, just redrill for the next size pipe up and use a tap.
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Unread postAuthor: MisterSteve124 » Tue Nov 07, 2006 10:55 am

yeah I'll give it a shot once I get the rest of the stuff I need. Thanks for your help guys.
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