Jetting conversion from gas to methanol

Envii44

New member
Does anyone have a good starting point for taking a stock NKA clone converting from gas to methanol on jetting?
Thank you
 
Its not just a jet change
I’m definitely not an expert on the motor side of things but I have mixed 1/2 gas 1/2 methanol on a stock motor, and went up a couple jet sizes and it seemed to run fine. Maybe idled alittle high, but was curious why It wouldn’t work just re jetting it
 
My calculator is giving me erouniuos results .
Half .038 is .019
.019x.019 is .000361
.000361x 3.1415 is .001134
 
Thanks to Mr Nunley . The spreadsheet is so much easier .
My math was right. Area not diameter .
So a .038 has .001134 square inches of area
A .040 has .001257 sq inchs
A .075 has .004418 is 251% larger .
A .070 has .003739 sq inche area and is 206% larger
 
You want twice the area of the jet, square it, multiply by two, then find the square root. Ex: if on a .038 gas jet, .038 x .038= .001444, x 2= .002888, square root is .0537401. So try a .054 and tune from there
So for fun i used this formula at 2.5 times the fuel .
Bam .060 .
Works pretty well .
 
I’m far from a motor guy but I will say, years ago when we ran the raptor flathead engines out of the box as a box stock class on methanol. All we changed was the jet and spark plug. That’s it, and went racing.
 
Quick question .
Considering that we need 1 1/2 - 2 times the volume of fuel .
If you increase your area by 100 % aren't you doubling the available area .
Where as a 200% increase is 4 times the original amount .
 
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