Rules
MidwestDirt Late Model Series
PO Box 56 | Ramona, KS 67475 | Phone: (336) DIRTCAR
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Addition on March 16, 2010: Hoosier tires only per UMP rules!
2010 Rules
1. The Rules and/or Regulations set forth herein do not express or imply warranty of safety, from publication of, or, compliance with these Rules and/or Regulations. They are intended as a guide for the conduct of the MidwestDirt Late Model Series, and are in no way a guarantee against injury to participants.
2. These Rules and/or Regulations will apply to all MidwestDirt Late Model Series sanctioned events.
3. MidwestDirt Late Model Series Officials shall have full authority over said sanctioned events, and, in the event of any dispute, the Head Official's decision will be final.
4. All cars are subject to be inspected by the MidwestDirt Late Model Series Technical Inspectors at any time during the event.
5. The MidwestDirt Late Model Series reserves the Right to alter or amend these Rules and/or Regulations in the interests of fair competition.
6. The MidwestDirt Late Model Series is NOT responsible for the Payment of all Purse Moneys or Bonuses some tracks pay the MidwestDirt Late Model purse with their own track accounts. In the event of any problems with reimbursements or payment of Purses etc. at any MidwestDirt Late Model Series Event, the MidwestDirt Late Model Series will attempt to resolve these problems on behalf of the Drivers.
7. The Rules and Regulations for the MidwestDirt Late Model Series have been sanctioned and approved by MidwestDirt Late Model Series. Any Nosepieces or Materials or Mechanical Devices that are NOT specifically mentioned in these Rules are Illegal unless or until they have been sanctioned and agreed to by the MidwestDirt Late Model Series. Teams that have any doubts or questions with regard to any particular new product should call the Series Director at the MidwestDirt Late Model Series office at (336) DIRTCAR.
Safety
Helmets are mandatory and must meet Snell SA2000 or SA2005 safety standards. Helmet must be worn at all times when car is on the track and must accompany car to tech inspection. Fire resistant drivers suits are mandatory, must be worn during competition, and can be 1 or 2 piece. Fire resistant neck braces, gloves, and shoes are not mandatory but highly recommended. The MDLMS also strongly recommends the use of a head and neck restraint system (HANS, Hutchens, etc.). A 5-point harness type seatbelt is mandatory and is to be mounted to the frame, not the floor pan. Belts must be under 3 years of age. Aluminum seats are mandatory and must be securely attached to the frame. A full containment type seat is also highly recommended. Fire extinguisher is mandatory and must be located within the driver’s reach.
Body (See attached diagram)
Aluminum bodies only. Roofs are required and can be carbon fiber. No dished out roofs or side panels. No mirrors, fins, wings, or lips of any kind allowed on the car. No wedge style bodies. No built-in fiberglass air dams. Driver must have 3 bars in front of him. Mud screens can be attached securely but not to impair the vision of the driver. Interiors may be dropped. All cars must have secure pick-up loops installed. Numbers must be at least 18 inches high and easily readable, located on both doors and the roof.
Spoilers
Rear spoilers only. Must be securely attached to rear of car along entire width. Maximum width is 72”. May be made of transparent material such as lexan. Adjustable spoilers allowed. Gurney flaps or curls are allowed along the upper edge of the spoiler but will be included in the height. Aluminum angle used to brace the upper edge of the spoiler will not be included in the height or length in any way. Spoiler sides must be present on both sides and be solid. Please see diagram for measurements.
Open Engine Option: Height not to exceed 8"
Steel Engine Option: Height not to exceed 12"
Crate Engine Option: Height not to exceed 12" (optional 2'x3' sideboard on left side is legal)
Spec Engine Option: Height not to exceed 12"
Engines
Open Engine Option: Aluminum or Steel. 6" engine setback measured from top of ball joint to #1 plug maximum. GM heads must have 1-2-1 exhaust. NO canted valves and no more than one spark plug and two valves per cylinder. NO titanium crankshafts or connecting rods. Rollers are legal. One 2-barrel or one 4-barrel carburetor only. Wet or dry sump systems are legal. Weight shall be 2300 lbs. minimum. May run a 8" spoiler.
Steel Engine Option: Must be 406cid or less. Wet or dry sump systems allowed. Steel blocks only. No aluminum heads. Heads must be 23 degrees only. Rollers are legal. One 2-barrel or one 4-barrel carburetor only. 8" engine setback measured from top of ball joint to #1 plug maximum. Weight shall be 2150 lbs. minimum. May run a 12" spoiler.
Crate Engine Option: Any unaltered 602 or 604 crate engine may compete. Weight shall be 2150 lbs. minimum. May run a 12" spoiler and optional 2'x3' sideboard on the left side.
Spec Engine Option: Designated as one of the following (SUPR, IMCA, or WISSOTA). Weight shall be 2150 lbs. minimum. May run a 12" spoiler.
SUPR .SPEC. Engines -350-362 c.i. (2150 lbs.) Steel Blocks only
Minimum 350cid -maximum 362cid using steel block, Maximum bore size is 4.060 Flat top pistons only. Bore-stroke combinations to achieve this: 3.480 or 3.500 on Chevrolet and 3.500 on Ford. Steel block for Chevrolet will have 9 inch deck and steel block for Ford will have 9.2-inch deck. Brodix SUPR spec heads (with 60cc minimum combustion chambers).
Chevrolet engines must have a Brodix HVl intake with no modifications except for port matching 3/4" to FelPro 1206
Ford engines must have an Edelbrock Victor Jr. intake with no modifications except for port matching 3/4" to FelPro 1262
NO LIGHTENING OF BLOCKS. If found, a 25lb. weight penalty will be accessed in front of the motor plate.
Chevrolet SUPR “spec” head with SUPR cast logos. Ford SUPR “spec” head with SUPR logo on the outside and SPEC logo on intake and exhaust ports.
1. Intake port opening NO larger than original opening and May be port matched. Chevrolet may use a FelPro 1206 gasket and FORD may use a FelPro 1262.
2. Chevrolet-intake opening may be ground or polished 3/4”or NO farther into port than the closest edge of the closest letter of the SUPR logo. Ford-intake opening may be ground or polished 3/8". Intake port polishing will be allowed NO more than 1½" below the bottom of the original seat ring on the back side of the bowl area, and NO more than 1” on the short side Any opening up of head past these points will be illegal.
3. Polishing will be allowed in the combustion chamber area to avoid hot spot chafing.
4. Polishing will be allowed in exhaust ports as long as the Original SUPR logo is NOT affected or port shape is not altered.
5. NO intake or exhaust port relocation, raising, enlargement or reshaping of any type.
6. Valve angle and placement may NOT be altered in any way on the SUPR “spec” head. NOTE: SUPR has and will be using Brodix supplied checking templates and tools on the SUPR Head. DON’T GO past these points or templates and tools will disqualify you.
7. In the rules above, if it doesn’t say you can, then don’t. NOTE: These head and intake manifold combinations were designed with one thing in mind, to have equal air flow. If anything is done to increase airflow above original specs by manufacturer, they will be illegal. NOTICE: All heads will require. 11/32 valves. NO EXCEPTIONS.
WDRL and Wissota Aluminum Spec Heads - 0-362 c.i. Only (2150 lbs.) “SUPR Spoiler Rule” Steel Blocks only
A. Only WISSOTA approved Brodix Spec Aluminum heads allowed. Allowed part numbers include:
1. Chevrolet - SPCH WISSOTA
2. Ford - SPFO WISSOTA
3. Mopar - SPMO WISSOTA
B. Absolutely NO removing, relocating, grinding, polishing or defacing of any letters or numbers cast into the Brodix WISSOTA Spec. aluminum cylinder heads.
C. Heads may be angle milled, although valve angle must remain within 1 (one) degree of original manufactured specification.
D. Valve guides must remain in original angle and spacing as manufactured. Valve guides may not be tapered, thinned or shortened in any way.
E. Absolutely no welding or adding material of any kind to the head.
F. Removal of material from the head is only allowed as listed below:
1. Chamber may be ground for dome clearance and polished.
2. Intake Port - Intake bowl may be blended and polished from the valve seat to the edge of the letter C in the word “Spec” on the roof and floor of the intake port. The side of the intake port may also be blended and polished from the valve seat to the same point as the roof and floor. Absolutely no grinding or polishing along the side walls where the spec logo is cast. Factory CNC port match must not be altered in any way.
3. Exhaust Port - Exhaust seat may burr blended into the exhaust bowl and exhaust port may be polished as long as the word “Spec” in the roof of the exhaust port is not touched and the exhaust port exit at the header flange remains in the original as cast location, size and shape.
4. May machine for pushrod clearance.
G. Absolutely no enlarging, relocating or other altering of any head bolt hole, dowel hole, or threaded hole in the head except as noted below:
1. May spot face head bolt holes after angle milling head.
2. Heli coils may be used for repairs.
3. Absolutely no grinding or polishing of any kind anywhere on the casting, except in the combustion chamber, and in the areas of the intake port and exhaust ports as stated above, and for pushrod clearance.
H. Any internally repaired spec head must be recertified by Brodix.
I. Spec head checking fixtures will be used by officials to check all specifications and dimensions listed above.
IMCA SPEC ENGINE RULES: 0-362c.i Only (2150) “SUPR Spoiler Rule”
(A) Steel blocks only.
(B) Maximum 361 c.i. (GM), 362 c.i. (Ford) 364 c.i. (Chrysler). Minimum four-inch bore. Minimum stroke: GM - 3.48 inch, Ford - 3.40 inch, Chrysler - 3.313 inch.
(C) Maximum compression - 10.5 to 1, checked at any time with Whistler. No tolerance.
(D) Brodix/IMCA spec cylinder heads only. No grinding, polishing or altering of any kind. No use of any substance that may change or alter shape or size of ports, runners or combustion chambers. Maximum valve sizes are 2.08 intake and 1.600 exhaust. Valve seats and guides to remain as manufactured and in as-cast positions. Minimum combustion chamber size to be 62 cc volume. Valve angle to remain as manufactured. Approved cylinder heads as follows:
• General Motors (i.e. small block Chevrolet) - Brodix # 46 221
• Ford Motor Company (i.e. small block Windsor) Brodix #46 223
• Chrysler Corporation - Mopar - Brodix #46 222
(E) Any intake manifold, Any one inch or two inch carburetor spacer allowed.
(F) Camshafts may be of roller, flat tappet or mushroom design.
(G) Crankshafts and connecting rods must be steel. One inch inspection hole required in pan - no obstructions to crank and rods. If obstructions are present, must remove pan for inspection.
(H) Flat top pistons only.
(I) One four barrel carburetor only. All engines must be based on factory design and be naturally aspirated. No Turbochargers or Blowers. No fuel injection. . Magnetos are permitted, but all cars must have an operating self-starter.
Weight
Scales at the track will be considered final. Competitors are encouraged to weigh before the event.
Open Engine Option: 2300 lbs.
Steel Engine Option: 2150 lbs.
Crate Engine Option: 2150 lbs.
Spec Engine Option: 2150 lbs.
Chassis
Rack and pinion steering allowed. Coilovers are legal. Fifth arm or torque link legal. Roll cage diameter minimum is 1.5” with tubing not less than .083 thick. Car must have at least 3 door bars of the same material mounted horizontal on the driver’s door. Square tubing not allowed in cockpit area.
Wheelbase
Minimum wheelbase will be 103” measure from center of front hub to center of rear hub.
Wheels
Steel or aluminum allowed. Maximum width is 14”. Beadlocks legal. Foam and wheel disc type mud plugs allowed (must be bolted on behind beadlock).
Tires
Hoosier D55 WRS/WRS-2 only. Grooving and siping allowed. No additives or softeners allowed. All tires must durometer at least 55 at all times, no exceptions.
Driveshaft
Must be made of steel or aluminum and painted white. Must be equipped with a 360 degree drive shaft loop installed at the front of the shaft in case of break.
Battery
Heavy duty and dry-cell batteries may be used. No batteries in the driver compartment area.
Fuel
Gasoline or alcohol may be used. No additives allowed.
Fuel Cell
Maximum 32 gallon allowed. Fuel cell must be encased in steel can and secured by at least 2 straps (minimum 2” wide by 1/8” thick). Fuel cell flapper or rollover valve mandatory. Fuel vent check-ball valve is mandatory.
Transmission
Bert, Brinn, and Falcon-type transmissions are legal. Must have at least 2 forward and 1 reverse gears. If running external clutch explosion-proof bellhousing required. Safety shield is mandatory for automatics. Car must be able to move forwards and backwards on its own at any time from a standing start.
Rear End
Floater or quick change rear ends legal. No type of lockers or bias sensing devices allowed.
Ignition
Only 1 is legal. HEI ignition and MSD ignition boxes are allowed. MSD box and remote rev limiter control must be located out of driver’s reach. Only 1 electronic firing module is legal. Only 1 ignition coil is permitted. Magnetos are legal. Crank censored ignitions not allowed.
Traction Control
At no time shall any performance enhancing traction control system be on a car. This will be strictly enforced. Any devices that senses wheel spin or rpm spike will be deemed as traction control. Any driver found with these types of devices will be immediately banned from the MDLMS.
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