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[logoman]

would there be any difference in performance between 3mm or 2mm tube between gas tank and burner?

[MONAHAN STEAM MODELS]

I haven't noticed any difference in performance between 3/32" and 1/8" copper tubing.

If you are using small jet sizes for your burner such as #5 to #8 I really don't see there being any difference in performance since the orifice diameter size in the jet is between .009" with a number 5 and .010" with a number 8. If you are using a jet size that has an orifice size that is a lot larger than these, than there might be some what of a benefit to use bigger diameter gas tubing to make sure the jet is getting plenty of gas to it.   

[logoman]

thanks, confirmed what I'd thought.

[derekwarner]

Hi Nick.......if we go back to the basic gas Laws...do we not consider the model gas burner set up as two elements?

1) is the free flow path for gas [tube ID] + actual tube length + friction loss = the first restriction
2) the burner jet = the second restriction

So to counter both of these, the flow of the [constant] gas pressure increases in velocity when passing through each oriface.... 

You may remember we discussed this P1 V1 T1 thingie in Paddleducks some time back....end result was they threatened to lock me up  if I didn't stop    .....Derek