< Previous | Contents | Next >
IC.2.4.1 All airflow to the engine(s) must pass through a single circular restrictor placed in the intake system.
IC.2.4.2 The only allowed sequence of components are the following:
a. For naturally aspirated engines, the sequence must be: throttle body, restrictor, and engine.
IC.2.4.3 The maximum restrictor diameters at any time during the competition are:
a. Gasoline fueled vehicles 20.0 mm
b. E85 fueled vehicles 19.0 mm
IC.2.4.4 The restrictor must be located to facilitate measurement during Technical Inspection IC.2.4.5 The circular restricting cross section must NOT be movable or flexible in any way IC.2.4.6 The restrictor must not be part of the movable portion of a barrel throttle body.