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Gas jet resizing

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Bangkok Mick:
Hi all,

I am looking to get some more heat from my gas burner for  steam engine boiler to increase the head of steam. The original fitting and jet was from Macsteam with a jet with a number 5 printed on the side. I plan to change this with a jet I have salvaged from an old soldering gas torch.

Has anyone any advice on the maximum size jet that is safe to use? The new jet is a pin hole in a thin foil as in the picture, is safe to increase this size with a pin to open up the gas flow or am I risking a blow back or some other failure that could make the system unsafe.

Cheers Mick

R.G.Y.:
Just get a number 8 jet cheep enough.

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