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Ed,
I have another one for you!
I am currently copying some of the parts of
different carbs to cobble together my own design. I found info that the slide
carbs with the flat ground needle - have a needle size of 1/8" ( 3.175mm) and
are ground to what appears to be 'half' their original size at
WOT. My needle stock is 3.18mm, with sliding tolerance, the needle seat/
jet is 3.23mm
That is the sized used for a 38mm carb and I was
wondering if the 44mm carb might need a bigger needle, but I don't know how to
calculate the main jet size/ fuel flow.
I have 13.1936 lbm (min of air) and 1.043lbm (min
of fuel) at 12.65:1 fuel ratio, at 7,500 rpm (WOT).
Can you show me how to work out the main jet size
please, I just need to know if I'm in the ballpark or need to go up in needle
size, if the depth of the grind exceeds 'half' the needle size at
WOT.
George (down under)
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