05-04-2007, 11:23 PM
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Senior Club Cobra Member
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Join Date: Jul 2002
Cobra Make, Engine:
Posts: 15,712
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Drill Bit sizing (carb jetting)
WHAT is the deal with carb jet sizing? An 85 or a 92 is WHAT in terms of a drill bit size?? A numbered drill bit size (1 to XX)? Letter drill bit size (A to Z)? Fractional drill bit size, now theres one I understand! 
I want to drill some jets for experimental use on a small motor. I found a set of 'jet drill bits' for about $250 that are numbered in 'jet size', whatever the heck THAT is! $250 to drill a couple of holes is just to much! Gotta be a cheaper way.
Are some jets actually 'tapered' to increase velocity effect? If so, then drilling a stright hole might not be a good idea.
Anybody got any input on this confusing topic? |
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