SpudFiles

Would this meter work? I'm going for something like the meter from Ultimate Spud Gun

On paper, yes.
In the shop, a bit harder.

The reason I say that is in the shop I have spent countless hours messing with o-ring seals. I have a lathe, and can still be a pain. If you have to use o-rings I suggest using a floating o-ring. Even though frustrating I do enjoy the stubborn route.

If your looking for less of a headache why not go with the traditional metering system? http://img117.imageshack.us/img117/7574 ... ted7gm.png

Even consider a 5/2 way valve foelr one touch metering, like SB did on the TMBA V2. Look in the hybrid section for it.

CS wrote:The reason I say that is in the shop I have spent countless hours messing with o-ring seals. I have a lathe, and can still be a pain.

Not if you know what you are doing, o-rings are built to certain specifications and specific tolerances - and it doesn't take much to do some research and make sure you've got the right seals for the job at hand.

Here's a useful guide, there are plenty of others online: http://www.sealdynamics.com/o-ring-reference.pdf

Even consider a 5/2 way valve foelr one touch metering, like SB did on the TMBA V2. Look in the hybrid section for it.

For combustion you only need 3/2 valve, SB used 5/2 valve because hybrid need to be charged with air as well. Now thinking about it, I have 3 of these valves laying around doing nothing I wish I could get a bottle of propane to build a proper meter for my hybrid

wyz2285 wrote:

Even consider a 5/2 way valve foelr one touch metering, like SB did on the TMBA V2. Look in the hybrid section for it.

For combustion you only need 3/2 valve, SB used 5/2 valve because hybrid need to be charged with air as well. Now thinking about it, I have 3 of these valves laying around doing nothing I wish I could get a bottle of propane to build a proper meter for my hybrid

Can't you find the right propane bottle? I was reluctant to buy the propane/MAPP bottles commonly seen on this forum when I found out that the camping ones are more or less the same size, have the same fitting, and cost $6 compared to $32 where I live. I think you mentioned you also needed the brass fitting for it too? That is problematic, I bought mine online from BCArms (an old spudgun run by a former member) but I think you can also find them at other places online that might post them to you.

Another option is the refillable propane tanks, I rely on 20lb tanks for my fridge and stove, a refill or exchange is about $20-30, and you get 20 times the amount of propane. You can even refill smaller containers, and there's no need to muck around tapping a blowtorch head, just buy a $8 POL fitting with 1/4" NPT, chuck a reg and hose barb on, and you'll be set.

Its illegal to refill your own propane tanks in Ontario.

spudn00bie wrote:Its illegal to refill your own propane tanks in Ontario.

Is it legal to build a spudgun

It would work, but you need to make sure that the valve closes fuel input before it starts to "open" to chamber.. to be accurate it needs to -> fill meter -> close fuel input -> open outlet to chamber.

I've made my own propane tanks before - they can be convenient sometimes when you need a special size or form factor!

I decided to make myself a portable propane tank that I can refill when connected with a domestic use propane tank. The liquidating pressure is around 8.6 bar at 21 degree Celsius right? Portugal isn't a hot country so it shouldn't get more than 15 bar even at summer (30-35 Celsius max). Is it ok to use pneumatic components with it? I know that air regulators don't but valves should be fine I think. I'm thinking about install a flow control valve on it and hopefully manometric fueling.