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mod minis
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MOD MINI CLASS RULES - 2022-2023
If the rules do not say you can do it, then don’t do it! Be sure to check the General Rules. All interpretations of rules by a Speedway Management or Speedway Technical Official are final. UNAWARENESS OR IGNORANCE IS NO EXCUSE!
** No 15” wheel designed cars permitted, 3 link cars must add 100 lbs. anywhere to total weight.
1. BODY
May be constructed of steel, aluminum, or fiberglass
Must have 4’’ ground clearance, body and frame included – measured with the driver out of the car.
Front windshield required, LEXAN mandatory no glass or Plexiglas
Rear window permitted
Must have 14’’ opening from door to roof
Side windows no longer than 10’’ measured at corner of door and roof post
Bumper measurement from ground to center of main bar will be MINIMUM of 16’’
MAXIMUM 19’’
Nose piece optional Rear window optional bracing on inside only
Spoilers, maximum 6’’ in height by 60’’ in width. No side boards or spoiler sides.
2.WEIGHT
MINIMUM WEIGHT FOR ALL CARS IS 2000 LBS.
1 lb. per cc for engine being used 2000 engine= 2000 lbs. 2200 engine= 2200lbs. 2300 engine= 2300lbs.
55% left side weight with driver, after race (zero tolerance)
Front wheel drive cars may not have more than 58% front weight after race (ZERO TOLERANCE)
Car with stock floor pan, stock firewall, rear kick up panel with K members in stock location, stock rear end mount and stock rear suspension mounting points will be allowed a 50 LBS weight deduction.
In order to keep the class competitive. Weight may be added to any dominant car in increment of 50 lbs.
All ballast must be attached by two ½’’ bolt and be painted white with car number on it
No car over 2500 lbs. (FOR SAFETY REASONS)
3. ROLL CAGE/CHASSIS
All lead, and mounting bolts must adhere to ride height rule!
Main roll cage must be constructed with a minimum of 1 ½ round steel tubing .095 wall
Bars must be welded to frame and have a minimum of 4 door bars on driver side. Recommend door bars be plated with minimum1/16 plate or thicker.
May use stock frame rail and floor pan or construct chassis
Must have stock front cross member. Must use stock lower control arms and spindles
Cars with upper control arms may use tubular A arms
One-piece sway bar (aftermarket allowed) mounting optional diameter optional
Rear suspension must maintain stock configuration.
No bump stops, coil binding, or chassis limiting devices!
(Mustang must have coil spring with 4 link trailing arms. may use tubular trailing arms
Must be stock length. mounts on rear end housing must remain in stock location.)
(Pinto must run leaf spring main leaf must be stock length. Slider with wedge bolts OK)
4. SPRINGS
Springs must mount in stock location. Coil spring cars may run any coil spring that will fit into bucket.
Leaf spring cars may run after market leaf spring, number of leafs optional.
Strut cars may use tech approved coil-‐over adjusters if came stock with spring on strut.
Only one full spring rubber allowed per spring permitted.
5. ENGINE
Stock location (1’’ tolerance) 0 deck block, no tolerance
Engine and body must be by same manufacturer. Year engine interchangeable
Will be measured from the centerline of the rear end to the back of the engine block, Mustangs 89.5 inches, Pinto 88.5 inches. If engine is set back further,
25 lbs. will be added in front of flywheel per inch of setback.
Strapped heads and blocks are ok.
6. EXHAUST
Exhaust can exit passenger side door at the furthest point of the rear of the door
7. CARBURETOR
4412 Holley or smaller carburetor allowed must pass tech gauges. (No Holley xp 2-barrel carburetors)
Spacer/ adapter maximum 1.65’’ including gaskets
8. INTAKE/MANIFOLD
Stock OEM intake as originally produced by manufacturer
Effective 2023- No Ford Taunus intake manifolds
NO porting polishing or cleanup of any kind. Modification allowed where no adapter
Is available to mount 4412 Holley (you cannot take advantage of this rule to improve
Airflow. And needs to be tech approved)
9. HEAD
Stock head for the type of engine used. (i.e., 2000 block/2000 head; 2300 block/2300 head 2.2 block/2.2 head and so on. no m-13-cylinder heads.
No porting, polishing, or cleanup of any kind. may be milled. Cylinder head boss may be cut
Down for short adjusters (2300). may have 3 angle valve job. (No more than 75 degrees).
No pocket porting or cutting under seat. Valve spring pocket may be cut .0100” deeper or may run Long valves. (Stock head diameter, stock stem size)
Stainless steel valves allowed
Only 2 valves per cylinder. NO 4 spark plug heads NO fuel injected heads.
No dual overhead cams.
10. PISTONS
Any 3-ring flat top piston must run all three rings. (Toyota may run dome piston) max over bore .060 over stock
11. CRANKSHAFT
Stock crank for engine used. May be balanced on bottom of counterweight only. No other grinding, polishing, drilling, or lightening of any kind allowed. No knife edge or changing of counterweight profile allowed.
12. RODS
Any steel connecting rod permitted.
13. CAMSHAFT
Any cam and kit. (No rollers) may run adjustable cam sprocket.
14. FLY WHEEL/CLUTCH/PRESSURE PLATE
Fly wheel optional (MUST BE STOCK DIAMERTER) 8 LB. MINIMUM Clutch stock diameter
clutch and pressure plate (minimum 7 ½)
15. WHEELBASE
Same as car (chassis) used, i.e., pinto. Mustang. So on and so on (1” tolerance)
16. SHOCKS
May not run strut and shock combination.
Any nonadjustable steel body racing shock or strut is permitted. $150.00 retail price limited for each shock or strut (May be claimed for $150.00) must be paid to tech official within 15 min. of completed race must finish on lead lap.
17. STEERING
Steering box and components must be stock and in stock location.
(May run Heim ends on outer tie rods)
18. BRAKES
Any pedal assembly. Master cylinder or proportion valve set up.
No other aftermarket brake parts (caliper, rotors, or drums)
No drilled rotors
19. REAR-END
Stock for car used (NO custom gear sets. NO quick change)
Rear-end cannot be offset
May be locked; NO aluminum spools or gold tracks
No camber rear ends. Cars with independent rear may not have more than ½ degree of camber.
20. DRIVE SHAFT
Steel or aluminum
Must have drive shaft loops, within 10 inches of u-joints, also driveshaft must be painted white with car number
21. TRANSMISSION
Standard or (automatic with working torque converter)
Must be stock OEM and unmodified must be in good working order with reverse
And all forward gears.
22. IGNITION
One 12-volt battery only
Electronic ignition permitted. MSD ignition boxes permitted
NO coil packs or crank trigger fired ignitions
Must have battery disconnect mounted in quarter window on driver’s side for safety.
23. FUEL/CELL
Fuel cell mandatory 12-gal max with foam must have check valve
9’’ minimum ground clearance and rear protection bar minimum of 1 ¼ .095 wall
2 straps minimum of 1’’ in width surrounding the entire fuel cell fuel cell must be
bolted in car no rivets no sheet metal screws pump gas or track approved racing gas only.
No additives. No alcohol.
No electric fuel pump.
24. TIRES/WHEELS
Wheels 13” – 8” steel racing wheels
Track tires is American Racer 13” tire.
Tire Durometer rule 46 minimum.
If the rules do not say you can do it, then don’t do it! Be sure to check the General Rules. All interpretations of rules by a Speedway Management or Speedway Technical Official are final. UNAWARENESS OR IGNORANCE IS NO EXCUSE!
** No 15” wheel designed cars permitted, 3 link cars must add 100 lbs. anywhere to total weight.
1. BODY
May be constructed of steel, aluminum, or fiberglass
Must have 4’’ ground clearance, body and frame included – measured with the driver out of the car.
Front windshield required, LEXAN mandatory no glass or Plexiglas
Rear window permitted
Must have 14’’ opening from door to roof
Side windows no longer than 10’’ measured at corner of door and roof post
Bumper measurement from ground to center of main bar will be MINIMUM of 16’’
MAXIMUM 19’’
Nose piece optional Rear window optional bracing on inside only
Spoilers, maximum 6’’ in height by 60’’ in width. No side boards or spoiler sides.
2.WEIGHT
MINIMUM WEIGHT FOR ALL CARS IS 2000 LBS.
1 lb. per cc for engine being used 2000 engine= 2000 lbs. 2200 engine= 2200lbs. 2300 engine= 2300lbs.
55% left side weight with driver, after race (zero tolerance)
Front wheel drive cars may not have more than 58% front weight after race (ZERO TOLERANCE)
Car with stock floor pan, stock firewall, rear kick up panel with K members in stock location, stock rear end mount and stock rear suspension mounting points will be allowed a 50 LBS weight deduction.
In order to keep the class competitive. Weight may be added to any dominant car in increment of 50 lbs.
All ballast must be attached by two ½’’ bolt and be painted white with car number on it
No car over 2500 lbs. (FOR SAFETY REASONS)
3. ROLL CAGE/CHASSIS
All lead, and mounting bolts must adhere to ride height rule!
Main roll cage must be constructed with a minimum of 1 ½ round steel tubing .095 wall
Bars must be welded to frame and have a minimum of 4 door bars on driver side. Recommend door bars be plated with minimum1/16 plate or thicker.
May use stock frame rail and floor pan or construct chassis
Must have stock front cross member. Must use stock lower control arms and spindles
Cars with upper control arms may use tubular A arms
One-piece sway bar (aftermarket allowed) mounting optional diameter optional
Rear suspension must maintain stock configuration.
No bump stops, coil binding, or chassis limiting devices!
(Mustang must have coil spring with 4 link trailing arms. may use tubular trailing arms
Must be stock length. mounts on rear end housing must remain in stock location.)
(Pinto must run leaf spring main leaf must be stock length. Slider with wedge bolts OK)
4. SPRINGS
Springs must mount in stock location. Coil spring cars may run any coil spring that will fit into bucket.
Leaf spring cars may run after market leaf spring, number of leafs optional.
Strut cars may use tech approved coil-‐over adjusters if came stock with spring on strut.
Only one full spring rubber allowed per spring permitted.
5. ENGINE
Stock location (1’’ tolerance) 0 deck block, no tolerance
Engine and body must be by same manufacturer. Year engine interchangeable
Will be measured from the centerline of the rear end to the back of the engine block, Mustangs 89.5 inches, Pinto 88.5 inches. If engine is set back further,
25 lbs. will be added in front of flywheel per inch of setback.
Strapped heads and blocks are ok.
6. EXHAUST
Exhaust can exit passenger side door at the furthest point of the rear of the door
7. CARBURETOR
4412 Holley or smaller carburetor allowed must pass tech gauges. (No Holley xp 2-barrel carburetors)
Spacer/ adapter maximum 1.65’’ including gaskets
8. INTAKE/MANIFOLD
Stock OEM intake as originally produced by manufacturer
Effective 2023- No Ford Taunus intake manifolds
NO porting polishing or cleanup of any kind. Modification allowed where no adapter
Is available to mount 4412 Holley (you cannot take advantage of this rule to improve
Airflow. And needs to be tech approved)
9. HEAD
Stock head for the type of engine used. (i.e., 2000 block/2000 head; 2300 block/2300 head 2.2 block/2.2 head and so on. no m-13-cylinder heads.
No porting, polishing, or cleanup of any kind. may be milled. Cylinder head boss may be cut
Down for short adjusters (2300). may have 3 angle valve job. (No more than 75 degrees).
No pocket porting or cutting under seat. Valve spring pocket may be cut .0100” deeper or may run Long valves. (Stock head diameter, stock stem size)
Stainless steel valves allowed
Only 2 valves per cylinder. NO 4 spark plug heads NO fuel injected heads.
No dual overhead cams.
10. PISTONS
Any 3-ring flat top piston must run all three rings. (Toyota may run dome piston) max over bore .060 over stock
11. CRANKSHAFT
Stock crank for engine used. May be balanced on bottom of counterweight only. No other grinding, polishing, drilling, or lightening of any kind allowed. No knife edge or changing of counterweight profile allowed.
12. RODS
Any steel connecting rod permitted.
13. CAMSHAFT
Any cam and kit. (No rollers) may run adjustable cam sprocket.
14. FLY WHEEL/CLUTCH/PRESSURE PLATE
Fly wheel optional (MUST BE STOCK DIAMERTER) 8 LB. MINIMUM Clutch stock diameter
clutch and pressure plate (minimum 7 ½)
15. WHEELBASE
Same as car (chassis) used, i.e., pinto. Mustang. So on and so on (1” tolerance)
16. SHOCKS
May not run strut and shock combination.
Any nonadjustable steel body racing shock or strut is permitted. $150.00 retail price limited for each shock or strut (May be claimed for $150.00) must be paid to tech official within 15 min. of completed race must finish on lead lap.
17. STEERING
Steering box and components must be stock and in stock location.
(May run Heim ends on outer tie rods)
18. BRAKES
Any pedal assembly. Master cylinder or proportion valve set up.
No other aftermarket brake parts (caliper, rotors, or drums)
No drilled rotors
19. REAR-END
Stock for car used (NO custom gear sets. NO quick change)
Rear-end cannot be offset
May be locked; NO aluminum spools or gold tracks
No camber rear ends. Cars with independent rear may not have more than ½ degree of camber.
20. DRIVE SHAFT
Steel or aluminum
Must have drive shaft loops, within 10 inches of u-joints, also driveshaft must be painted white with car number
21. TRANSMISSION
Standard or (automatic with working torque converter)
Must be stock OEM and unmodified must be in good working order with reverse
And all forward gears.
22. IGNITION
One 12-volt battery only
Electronic ignition permitted. MSD ignition boxes permitted
NO coil packs or crank trigger fired ignitions
Must have battery disconnect mounted in quarter window on driver’s side for safety.
23. FUEL/CELL
Fuel cell mandatory 12-gal max with foam must have check valve
9’’ minimum ground clearance and rear protection bar minimum of 1 ¼ .095 wall
2 straps minimum of 1’’ in width surrounding the entire fuel cell fuel cell must be
bolted in car no rivets no sheet metal screws pump gas or track approved racing gas only.
No additives. No alcohol.
No electric fuel pump.
24. TIRES/WHEELS
Wheels 13” – 8” steel racing wheels
Track tires is American Racer 13” tire.
Tire Durometer rule 46 minimum.