Vehicles shall compete in the following capacity classes which aligns with the existing Na, Nb and Nc capacity Classes:

• Class A Over 5100cc
• Class B 3501cc - 5100cc
• Class C 3001cc - 3500cc
• Class D 2001cc - 3000cc
• Class E 1501cc - 2000cc
• Class F 1101cc - 1500cc
• Class G Up to 1100cc

The Effective Capacity shall be the product of the Swept Volume and an equivalence factor dependent on the engine configuration as per other MSA regulations

• Piston engine – normally aspirated 1.00
• Piston engine – supercharged 1.70
• Rotary engine – normally aspirated 1.80
• Rotary engine – supercharged 3.06
• Piston diesel – supercharged 1.50