National Compact Dirt Series (MCDS) is a professional touring series. As a professional touring series we always try to maintain a very respectful, clean appearance on and off the track. We expect the same thing from all our drivers and teams. Please keep your cars looking clean and professional in appearance. All body panels must be on the car including: bumper covers, fenders, deck lid, hood and rear hatch or deck lid. Cars must have clearly legible numbers (no spray painted numbers) that are visible for race control and score keepers. Numbers on to be on both doors and the hood. A 5” or larger number is to be on the upper right corner of the windshield. Driver’s name is to be above the window openings on each side of the car. 

MCDS will always welcome home track drivers to compete with our series. Their home track rules will apply for them. Any rules, compliance exemptions, or waivers granted in this context will be at the sole discretion of  officials. Penalties, point forfeiture, or payout adjustments may occur for cars that are determined by MCDS officials to have a performance advantage relative to our regular MCDS legal cars. All regular series participants will be required to be in full compliance with all MCDS rules set forth with no exemptions or waivers granted.

Special Note:  

No one will be given waivers or exemptions for: fuel, shock/strut package, or weight.

Personal Safety:

All drivers must have a snell SA approved helmet with a SA2010 or later certification. Tag still has to be inside. Helmets must be worn at all times while on the racing surface. No motorcycle or dirt bike helmets are allowed. Head sock or helmet skirt is mandatory.

Drivers are required to wear a flame retardant SFI rated driving suit that is free and clear of cuts and/or rips. Flame retardant racing gloves and shoes must also be worn. No mechanic gloves. Hans device, Necksgen, or similar devices are mandatory. No foam wrap around or horseshoe neck collars permitted. All hans and Necksgen certification stickers must not be older than four years old from the present year. 

SFI approved window net is required and to be securely mounted with a latching device at the top. Window net must remain latched whenever the car is on the racing surface. A minimum of a 3” wide 5 or 6 point safety harness is required. Must be attached with Grade 8 hardware or better to the role cage or seat mount. Certification dates on the belts may not be older than 3 years from present date and still have certification tags attached on them. Belts must be securely latched when on the racing surface and an Aluminum containment seat is mandatory. Seat must be mounted to the roll cage using 1” minimum diameter tubing or material with equivalent or better strength. Must be bolted with 3 - 3” or larger grade 5 or better bolts with washers to prevent pull through.

Raceceivers are mandatory and a part of the driver’s personal safety equipment. Every driver is responsible for making sure they have a fully charged battery and that their raceiver is working before going on the track surface. We will do radio checks before every race and if you're found to not have a working raceceiver you will not be able to race. The raceceiver channel during all events unless otherwise specified by MCDS officials will be: 450.000

Safety inspections will be conducted for each car on a yearly basis and at every MCDS event. Cars that meet MCDS approval will be marked by technical officials. Any car not inspected and/or approved by MCDS tech will not be allowed to participate in any on track sessions or races until clear approval or waiver has been granted by officials after completing the inspection.

Eligible Cars:

4 or 6 cylinder front wheel drive or 4 cylinder rear wheel drive compact cars only. No full size cars allowed. No SUVs, Cross Overs, or Vans permitted. Wheelbase must be between 90 and 107 inches. Toe plates outside of tires and 75” max width. No convertibles or all wheel drives allowed. No all wheel steering allowed. No rear or mid engine cars allowed.

4 or 6 cylinders only. Automatic or manual transmission allowed. No super or turbo charged engines allowed. No chemical power adders of any kind (NO2, benzene, nitromethane) allowed. 4 cylinder engines must be push rod, SOHC, or DOHC. OEM stock variable cam timing is allowed on 2.5 liters or less. Maximum displacement on 4 cylinders is 2.5 liters. 6 cylinder engines can be SOHC Or DOHC with maximum displacement being 3.5 liters. Cars must use OEM engine type manufacturers. Example: ford to ford, chevy to chevy, honda to honda, etc. No aftermarket blocks. Stock type cylinder heads with stock casting or the engine type and original displacement used. Throttle body must be attached to the intake manifold at the stock location. Aftermarket intakes are allowed on all SOHC and DOHC engines. MCDS will not be using restrictors, but officials reserve the right to place a restrictor on cars deemed to have an advantage. Throttle body or multi-point injection allowed. One fuel injector per cylinder. OEM starters only. NO ITB INTAKES ALLOWED. Internal Engine Modifications such as porting, decking, and camshafts are all allowed. All forward and reverse gears must work. No tuning devices for engines or transmission allowed.  No traction control. 

Exhaust:

A complete exhaust system consisting of a single tube extending from manifold or header exit to exit point behind the driver’s seat under the car. Must be securely mounted. Exhaust may exit to the left or right or center of the car. If exhaust exists in the center of the car it must have a turndown towards the track. If the tip is within 6” of the fuel cell there must be a heat shield between the fuel cell and exhaust tip. Maximum exhaust size is 2 ½  and must be the same diameter from the header/manifold or flange/reducer to the system exit. No open headers. Exhaust may be welded or bolted, but must have no leaks. Exhaust must be routed under the car. No part of the exhaust may enter the driver’s compartment. No dual exhaust. 

Roll Cage:

No square tubing. Only round tubes will be allowed. Roll cage must be 4 or 6 point design and be constructed of 1 ¾ or 1 ½  .095 steel tubing. Must be roll cage tubing (HREW, CREW, OR DOM). All tubing connections, seams, and bracing must be fully welded. No tack welds. Cage must be attached to the floor/unibody frame of the vehicle by welding to the rocker rail or to ¼ minimum thickness sandwiched plates bolted to the floor. However, it is highly recommended that the 4 point be attached with 2”x2” square tubing instead of sandwich plates. Reinforcing  plate, tubing, or steel angle on the inside of the rocker rails is required. Main hoop of the cage must include a diagonal reinforcing bar. Roll cage must include a minimum of 3 door bars per side connected with spacing bars between each door bar. Drivers' side bars must be arched away from the driver’s seat area. Driver's door bars must be connected by tubing or bracing to the rocker rail to reduce inward bending on impact. Driver’s door bars must be covered with steel plate on the outside (minimum of ⅛ thickness. Roll cage design must include a minimum of 5 bars extending side to side (top of the main hoop, dash bar, middle of the main hoop and the bottom of the main hoop). An additional bar connecting the left and right side door bars behind the driver’s seat is permitted; bars extending through the firewall are permitted. Diagonal support bars extending from the main hoop to the rear are encouraged and may extend to a distance no closer than 10” from the rear bumper. Teams are encouraged to add as much additional bracing within the roll cage as they deem necessary. Any roll cage that does not meet the approval of MCTS officials will not be allowed onto the race track. Core supports may be reinforced or replaced with tubing, but will not extend past the strut towers. Tubing directly connected to the core support to the roll cage is permitted. 

Bodies:

All exterior trim including lights, body moldings, mirrors, etc. must be removed. All cars are required to have a front bumper cover, hood, both front fenders, windshield, all doors (2 or 4 door), both ¼ panels, deck lid (must enclose trunk area) and a rear bumper cover. Pillars A and C  must remain stock. Stock or stock appearing body panels must be used. We will allow sportsman style front ends (fenders, bumper covers, and hoods). Aluminum sheeting will be allowed for bodies. Stock appearing bumper covers made for oval racing or aftermarket cars may be used if they are the same size, shape, or style resembling factory parts. No downforce style, shovel, or dirt late model style bumper covers are allowed. Doors must be welded shut or bolted. Door can be skinned. Skirting on the front area sides are permitted, but must not extend more than ½” beyond the outside width of the tires. No sharp edges or ends on skirts. No splitters or rear air diffusers allowed. No body panel, skirt, or bumper lower than 3” above the ground allowed. No venting of the interior, floor, hood, fenders, roof, quarters, doors, or trunk panels with the exception of fuel cell vent or driver ventilation system. Brake cooling ducts connected to the front bumper cover are permitted. All body panels must be securely attached to the car at the beginning of the race event. Hoods are to remain on at all times when the car is on the track. Any body panel, wheel opening, or body attachment that is deemed illegal or unsafe must be corrected at the discretion of the MCDS tech official before the car is permitted on the racing surface. No bars can come through any body panel or bumper cover. No bars below the bumper cover except the crash bars for the fuel cell and they must be at least forward of the start of the rear bumper cover. Rub rails are permitted on both sides at doors only. Can only be mounted flush against the door skins. No nerf bar style rub rails. Rub rails may be 1”x1” steel or clear plastic or lexan decal protector type. Both mounted flush with no rough or sharp edges. 

Front Windshield:

Three vertical bars are required in the windshield area ahead of the driver. 

Spoilers:

Rear deck spoilers are allowed. Maximum spoiler size is 2” Tall and 60” wide. Maximum height of spoiler may not exceed 5” above deck lid surface. Fabricated spoilers must be see-through (Lexan) or metal may be used if the spoiler does not limit visibility. Any spoiler deemed unsafe by MCDS officials must be removed before the car is allowed on the racing surface. The front edge of the spoiler must be within 4” of the rear edge of the decklid measured horizontally. Spoilers may not exceed more than 3” beyond the decklid rear edge. No roof mounted spoilers are allowed. No window mounted spoilers or any other window aerodynamic devices are permitted. Window mounted ducts for driver ventilation is permitted. No verticals, shark fins, billboards, or similar devices allowed. 

Frames/Trunks:

Car must have a stock frame, stock firewall, and stock floor pans, complete and unmodified. All openings in the floor and firewalls must be covered. Truck floor may be removed or modified to allow for fuel cell installation. Hood and decklid must be secured with a minimum of 2 hood pins each. All glass must be removed from the vehicle except for the front windshield. All interior trim, carpet, and sharp trim brackets must be removed from the interior and trunk areas. All airbags must be removed. No full tube chassis cars allowed. Must be stock firewall and floor boards up to the rear of the rear strut area. Area after rear strut towers can be tubed.