SpudFiles

the air through meter design

Ohh I think I get it now... I just had one of those 'aha' moments

The meter tube has smaller volume than the volume of the chamber so you don't need to set the reg to 6.44psi but instead you can set it to ~64.5 psi (provided that the meter V is 1/10 of the chamber volume).

'Air through' means that air flows to the chamber via the meter - thus mixing it.

D_Hall wrote: I've done metering with two similar sized orifaces running different pressures to deliver the correct fuel/oxygen mixture. Very easy to do.

Admittedly, in my system it was for an ambient pressure system so that made things easier but it's still a thought.

The idea behind the same pressure and two orifice sizes is it can be used for various delivery pressure while maintaining the same ratio, such as filling a 2 to 8X mix hybrid. It would even properly fill a vacuum purged chamber.

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Technician1002 wrote:The idea behind the same pressure and two orifice sizes is it can be used for various delivery pressure while maintaining the same ratio, such as filling a 2 to 8X mix hybrid. It would even properly fill a vacuum purged chamber.

The same could be done via pressure control assuming your gas choice was appropriate (I was using acetylene, obviously you wouldn't want to use that on an 8X hybrid.). The difficulty isn't in arriving at a combustible mix, the difficulty is in arriving at the desired X mix.