Rotaries are subjected to a 50% increase in capacity.
12A = 1.8L, 13B = 2L, 20B = 3L
12A turbo = 2.16L, 13B turbo = 2.4L and 20B turbo = 3.6L
Minimum wieght for a 12A turbo is 720Kg, 13B turbo 800Kg and 1100Kg for 20B turbo