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Old 17th September 2016, 05:37 PM
hmangphilly hmangphilly is offline
Senior Member
Join Date: Nov 2013
Location: wimborne
Posts: 584

the different colours have different sized apertures , which in turn allow different amounts of air to pass through .

general opinion is that the black port is best for 16j or 12 ft/lb.

i have drilled small ports to give greater flow...

4mm seems to be the size for a black one

Last edited by hmangphilly; 17th September 2016 at 05:42 PM.
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