how to made a good torque

L = (850 x ET) / MAX RPM - 3

L = length of exhaust pipe that will be made
ET = Exhaust Timing, when the exhaust valve starts to open before the BDP (bottom dead point)
MAX RPM = RPM (radians per minute / spin machine) that you wanted to get the peak of power

example:

My motor starts when the discharge opening 80 degrees before the BDP, then the calculation is
L = (850 x 260) / 12,000-3
L = 19.1 inches = 485 mm

Then find the calculation for the exhaust pipe diameter required =
D = sqrt (CC / ((L + 3) x 25)) x 2.1

D is the diameter of the pipe the desired
CC is a cylinder capacity
L is the length of the exhaust

Then the diameter of the exhaust pipe for my bike is:
D = sqrt (171 / ((19.1 + 3) x 25)) x 2.1
D = 29 mm

formula above is an excerpt from the book A.A. Graham Bell, the numbers 260 from the number ex plus 180 degree opening

Vc = ( pi x (D ²) x S )/ 4

Vc (volume cylinder / CC)
pi = 3.14
D = diameter of the bore / piston
s = stroke / step on the piston (units are centimeters). example: satria F 150 stroke's 4.88 just like a shogun 110.

example:

my motoride stroke is 61,4mm and bore 58.40mm

Vc= (3.14 x (6.10²) x 5,84))/4
Vc= 170,6 cc

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