jimmy101 wrote:It'll help if you actually would spend ten or fifteen seconds figuring out what you are trying to do.

Like others have posted, calculate the volume of the chamber. Water displacemnt is overkill since filling by counting seconds isn't going to be all that accurate anyway.New chamber: pi*1cm*1cm*8cm = about 25.1 square cm

Your units are wrong. The chamber volume is 25.1 cm<sup>3</sup>

The correct volume of butane is about 3.2%. (Accurate enough since your meter is not very accurate to begin with).

3.2% of 25.1cm<sup>3</sup> is 0.8cm<sup>3</sup>.

From your photos it looks like you have a small hose from the lighter to the chamber.

Disconnect from the chamber. Run the hose up into an inverted measuring cup filled with water and submerged in sink. Press the lighters valve and bubble say 2 seconds of butane into the measuring cup. Note the volume of gas in the cup. Divide the volume by the number of seconds you bubbled in the fuel. That gives you the approximate numbers of cm<sup>3</sup> this particular lighter delivers per second. Figure out how many seconds you need to get the 0.8cm<sup>3</sup> the chamber requires.

The only thing I've got to say is: Brilliant But will take a helluva lot of time to set up... By the way what formula/percentage of the chamber do you use to calculate how much cubic cm gas I need?

And yeah it was a typo back there, of course I ment 'cubic cm' instead of 'square'.