| The Mini-Stock 4 cylinder class is open to any sedan or hatchback built between 1980 and 2004. Wheel base may be no greater than 105 inches. The following vehicles are not allowed: - Porches, BMWs, Audis, Saabs, trucks, Station Wagons or convertibles of any make or model will not be allowed.
- Any turbo charged cars.
- No 4 wheel drive vehicles.
Frame, Chassis & Cage: - 6 point roll cage is required. Must have a full Halo and must have a minimum of 2 door bars on driver’s side. Drivers side door bars should be connected to main frame rail via two vertical bars running from bottom of lowest door bar to left side rail.
- Roll cage must constructed of a minimum 1 3/4” tubing with .095 wall thickness, be electrically welded and professional in appearance.
- Frame must be stock for year, make and model of car. No modifications or alterations of any kind allowed. Uni-body frames may install 2x2 tubing as sub-frame connectors.
- Suspension locating points may not be altered in any way.
- Radiator bracing is permitted by way of single hoop and two upright supports.
- Radiator bracing may be tied into main cage uprights by way of engine bay bracing. This tubing may connect to strut towers as it passes through the engine bay area.
- Any bracing used to brace suspension points can not utilize heim joints.
Interior: - All upholstery, trim and padding must be removed from interior of car.
- Front and rear firewalls must have all holes covered with a minimum of 22 guage sheet metal.
- All holes in floor must be covered with sheet metal.
- All glass except for windshield must be removed.
- Battery must be securely mounted behind drivers seat in a “marine type” spill proof container.
- Interior rear view mirror is allowed.
- Roll bar padding is required.
Body: - Body must be in stock location on frame.
- All chrome mouldings, ornaments, door handles, glass, lights and plastic components must be removed.
- Body must retain original height, length, width and overall dimensions.
- Doors must be welded or bolted shut. 16 guage steel plate is mandatory between door skin and drivers side door bars.
- All inner hood and trunk bracing must be retained.
- Hoods and trunks must open easily for safety purposes.
- Front and rear bumpers must be stock and in stock locations. Bumpers may be re-enforced internally.
- Front inner fenders may be removed.
- Wheel openings may be trimmed conservatively for tire clearance.
- Windshield may be stock or lexan. 4 safety clips are required. Top 5 inches of windshield must remain available for purpose of Kawartha Speedway sponsor decal placement.
- Rear windows are not permitted. 4 door cars may close in rear door window openings. Vent windows are allowed but must be approved.
- A minimum 24 inch high, 3 inch stroke number is required on the door area on both sides of the car. A minimum of 30 inch high, 3 inch stroke number is required on top of roof facing the passenger side of car. A block style number on right head light cover and right tail light covered is required. All numbers must be Kawartha Speedway registered and/or assigned. Number alterations may be required at any time by Kawartha Speedway to avoid duplication.
Suspension, Steering & Brakes: - Suspension may not be adjusted.
- All cars must maintain a minimum frame height of 5 inches.
- Suspension components may not be interchanged for those that are not stock or OEM for particular year, make and model.
- Stock rubber suspension bushings may be replaced with Polyurethane bushings.
- A 1/2 inch wheelbase tolerance will be allowed from side to side in the interest of alignment purposes.
- No “weight-jacking” devices of any type will be allowed.
- OEM Stock springs may be altered. Racing springs not allowed.
- Spring rubbers are allowed.
- Sway bar links, spacers and bolts must be the same length side to side.
- Maximum front wheel camber will not exceed 2 1/2 degrees positive or negative if stock wheels are used. Camber may be adjusted to suit handling if a steel racing wheel and oversized lug nuts are used on the right front . Upper strut mounts may be slotted to achieve this number and grade 8 or better hardware must be used. Bracing will be allowed across engine bay area in order to connect strut towers side to side. Bracing will be allowed to connect rear strut towers side to side and tie into chassis.
- Rear-ends or rear wheels may be cambered up to 3 degrees
- Posi-trac, lock-up and limited slip rear ends are allowed. If using rear wheel drive car, drive shaft must be painted white and have a drive shaft safety loop
installed. - Brakes on all four wheels must be in good working order. No brake biasing of any type permitted. No brake lines allowed in drivers compartment.
- Rear disc brakes are allowed if factory available for year make and model
Weight: Minimum weight will be calculated based on engine displacement size as follows: | Engine Type | Min. Weight | Max. Weight | Max. Size | Min. Weight / c.c. | | 8 or 12 valve SOHC | N/A | 2200 lbs | 2760 c.c. | 1.15 lb / c.c. | | 16 valve SOHC | 2200 lbs | 2400 lbs | 2300 c.c. | 1.20 lb / c.c. | | 16 valve DOHC | 2350 lbs | 2600 lbs | 2300 c.c. | 1.30 lb / c.c. | - Maximum left side weight will be 55%
- All weight measured with driver in car.
- Ballast must be securely fastened in centre of car. Ballast to be in blocks of no less than 5 pounds.
- No topping up with fuel after the feature event.
- In the interest of competition, weight penalties, of 25 - 50 lbs. may be added to cars after a Feature Win, plus an additional 25 - 50 lbs. for every feature win after that. All weight placement will be subject to Tech Inspectors approval.
- Drivers finishing 2nd, 3rd, 4th and 5th in Feature events will also be subject to penalty weight. Any penalty weight will remain in car for duration of season. Penalty weight may not be removed for 50 lap events.
- Kawartha Speedway also reserves the right to add or subtract any amount of lead at any time as they see necessary in order to keep the class competitive.
Fuel Cells & Fuel System: - Fuel cells are highly recommended.
- Fuel tank must be mounted in centre of trunk area and be a minimum of 13 inches above race track.
- Fuel tank must be protected from driver area by a full metal firewall.
- Fuel tank must be firmly fastened with two metal straps to the floor of the trunk.
- Fuel cells must have a minimum 1 3/4 tubing, .095 wall thickness, protection hoop behind cell.
- No fuel lines permitted inside driver compartment.
- No external fuel filler permitted outside of body.
- All cars must have an operational fuel shut off valve that is mounted in the main fuel line and easily accessible by driver and safety crews.
- Stock fuel pumps only. Electric fuel pumps allowed provided car was manufactured with it. When using an electric fuel pump an oil sender safety shut-off must be used.
- Pump fuel or track fuel only.
Tires & Wheels: - Maximum width of wheel will be 7 inches measured from bead to bead.
- No mixing of wheel size allowed.
- Stock production wheels may not be altered in any way.
- Any approved STEEL Racing Wheel will be allowed for use. Right side wheels must be steel only. Right side wheels may have any off-set as long as tire and wheel assembly is within the body lines of car. Left side wheels must maintain stock off-set. Wheels and tires exposed excessively will not be tolerated. Factory production aluminum wheels for year, make and model may be used on the left side.
- DOT approved tires only. No directional tires. Tires must be 200 tread wear. Maximum tire size of 205/60. Tires must have a minimum of 1/8 tread depth at any time.
- H rated tires will be allowed. No tires above H rating will be permitted.
- One tire size difference allowed side to side, front to rear.
- Falken – Azena tire is allowed & recommended.
- All tires subject to approval of Tech Inspector.
Transmission: - Transmission that was factory available for year, make and model of car may be used.
- Automatics and standards are allowed.
- All cars must have a working reverse gear.
- Clutch and Flywheel must be OEM or stock replacement. No aluminum or lightweight clutch assemblies permitted. No lightening or drilling of clutch assembly or flywheel.
Engines and Exhaust: - Engine must be 4 cylinder. No Rotary Engines. No V-Tec engines. No Turbo or Super Chargers.
- Must be the engine made for year, make and model of car.
- Engine must remain completely stock in all aspects
- Cylinder Heads must be stock for engine run with no modifications.
- OEM style cams and lifters only. Camshafts that are “Factory Re-Grinds” are not permitted.
- Stock OEM rocker arms and ratios only.
- Stock OEM Intake manifolds only.
- Battery must be removed from under hood area and mounted securely behind drivers seat.
- Carburetor to be stock as from factory. Stock fuel injection allowed. Carb spacers between carb and intake, or between plenum and head, will not be
allowed. - After-market air filter will be allowed. Ram Air systems and air scoops of any type will not be allowed.
- Stock exhaust manifold only. Factory, or aftermarket headers, are not allowed. OEM Factory type muffler is required. Maximum exhaust pipe size will be 2 1/2”. Exhaust must exit outside of car and to the rear of the driver.
- There will be NO TOLERANCE for any engine or engine part that is not absolutely stock.
Safety Requirements: - All drivers must wear approved safety helmets (minimum Snell 2005 standard). SA rated helmets only. No M rated helmets allowed.
- Fire retardant suit is mandatory. Fire retardant gloves are mandatory and fire retardant shoes are highly recommended.
- Aluminum racing seat mandatory.
- Driver’s seat must appear as close to stock position as possible. Seat must be securely fastened to roll cage and frame members.
- Quick release aviation type, minimum 3 inch safety belts required. Shoulder harness must be fastened to roll cage. Belts may be no older than 5 years prior to date of competition.
- An approved driver’s window net is mandatory.
- It is mandatory that a 21/2 pound fire extinguisher with gauge, aluminum head and steel mounting bracket be attached to the car’s interior on driver’s right side. Extinguisher must be with in reach of driver and accessible to safety crews from both sides. On board fire system highly recommended
- Two way radios are not allowed.
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