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IC.1.1.1 The engine(s) used to power the vehicle must:
a. Be a piston engine(s) using a four stroke primary heat cycle
b. Have a total combined displacement less than or equal to 710 cc per cycle.
IC.1.1.2 Hybrid powertrains, such as those using electric motors running off stored energy, are prohibited.
IC.1.1.3 All waste/rejected heat from the primary heat cycle may be used. The method of conversion is not limited to the four stroke cycle.
IC.1.1.4 The engine may be modified within the restrictions of the rules.