2011 Open Class Rules
Appendix C
Open 4WD, CRS-2, CRS-5 Class Rules
Open class cars are divided into four classes. Vehicles that are built to be capable of operating in four-wheel drive mode will be placed in Open Lite or Open 4wd class and cannot compete in CRS-2 or CRS-5. Two-wheel drive cars that were NOT designed to operate in four-wheel drive will be placed in either CRS-2 or CRS-5 and can not compete in Open Lite or Open 4wd. The table of adjustment multipliers below will be used to determine a vehicle’s adjusted displacement. All factors that apply to a given vehicle will be used. For example, a front wheel drive car with a 2.0L, 4-valve engine with variable cam timing would have a total multiplier of 1.32 (based on 1.2 * 1.1), producing an adjusted displacement of 2640cc.. Eligible vehicles with an adjusted displacement of no greater than 2650 cc will be placed in CRS-2 while those above 2650 cc will be placed in CRS-5.
Characteristic | Multiplier |
---|---|
Rotary engines | 1.8 |
Forced induction | 1.6 |
4 valves per cylinder | 1.2 |
3 valves per cylinder | 1.1 |
Variable cam timing | 1.1 |
Rear wheel drive | 0.9 |
Diesel Engine | 0.8 |
Pushrod Engine | 0.8 |