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469 Posts
RE: Accucraft GS 4 Chimney&Petticoat

Hi Michael,

My GS4 has the same problem as yours. Could not hold pressure above 50 psi while running.
Two fixes seem very important. 1) reducing the diameter of the blast pipe; It is not the exit volume that is important
but the exit velocity. 2)The fire box arch

It sound like you have done the first and should try the second.

After a year of fiddling these two changes made the difference.

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