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MOSPORT SPEEDWAY
THUNDER CAR This set of rules is designed as a basic guideline. All cars are subject to technical inspections by random selection at the end of each race. Any part of the car not specifically covered in these rules must remain stock. The Thunder Car division is open to any make of North American built automobile having a factory listed wheelbase of 101" or more, for the make, model and year being raced. No convertibles, four wheel drive vehicles or station wagons will be allowed. Mosport permits full size trucks, Sunset permits compact trucks. The word stock when used herein shall mean unaltered, as factory available and produced by O.E.M. for the make, model and year of the car being raced. That excludes all aftermarket “High Performance” parts, and all decisions and rulings shall be based on data obtained from the Canadian Service Data Book. SPECIFICATIONS APPEARANCE Cars must not be excessively rusted and must be presentable in appearance. Cars that are considered unsafe or improperly prepared will be rejected by the tech committee. Must be located behind the drivers seat securely fastened and in a sealed container e.g. A marine battery container with a lid if the battery is in the driver’s compartment. BODY Body must be steel and stock in appearance to the original vehicle, with no chopping, channeling or sectioning allowed. Body must be complete with all doors, fenders, quarter panels, hood, truck and roof as well as both bumpers. All chrome molding, door handles, name plates and lights must be removed. Truck body alterations must be approved by tech. A) BUMPERS Bumpers must be stock appearing and must be mounted in stock position with no sharp edges exposed. After market nose and tail cones are allowed. Chains or cables must be installed from the bumper to the frame for safety reasons. A fabricated bumper reinforcement may be used but a stock bumper or cover must be installed over the top. B) GROUND CLEARANCE Minimum frame and body height is 6". C) HOOD AND TRUNK LID No hood openings allowed. Inner hood and trunk lid bracing may be removed. If the original hood/trunk hinges are used, then 2 pins must be used. If it is not hinged, 4 pins are required. A rear spoiler is allowed but may not extend beyond the rear edge of the rear deck panel and must follow the contour of the rear deck lid. Maximum 5" by the width of the rear deck. No side pods or raising of the rear spoiler. D) SCRUB RAILS Side bars must extend no further forward than the rear of front wheel opening and no further rearward than front of the rear wheel opening. Maximum 1" x 2" welded or bolted to the roll cage with no sharp edges exposed. When bolting on scrub rails, you must use carriage bolts (or round-headed bolts), if hex head bolts are used, they must be counter sunk. 14" x 40" 16 gauge metal is recommended to go between the cage and the door skin on the driver’s side. E) WINDSHIELD A
windshield is mandatory and must be safety glass or lexan
with 2 secure center braces and 4 safety clips, 2 at top of the window
and 2 at bottom of the window. No plexiglass,
screens, or half windshields are allowed. The top 5" of the windshield
must be kept clear for BRAKES Brakes on all four wheels must be working. Rotors, calipers and spindles may be used from different models. Single piston steel calipers only must be used. No brake biasing of any kind, including valves, blocked lines etc. No brake lines allowed in the driver’s compartment. Only factory stock rear disc brakes allowed if drum brakes are not available for that make and model and a 50 lbs weight penalty will be added to rear wheel drive cars. CHASSIS AND SUSPENSION A) ROLL CAGE & FRAME Must be a stock steel frame with no holes drilled for lightening. Front and rear sub or unibody frames must be attached with straight 2” x 3” rectangular tubing with a minimum wall thickness of .095”. A full roll cage constructed with 1 ¾” x .095” minimum round steel tubing is mandatory. The roll cage must be symmetrical in all directions. A minimum of four horizontal door bars on the driver’s side with a minimum of two vertical bars between each horizontal bar (“X” type bars will be allowed) on the passenger side. A left leg protection bar must be installed between the roll cage and the left front frame rail. A dash bar is required and also an “X” type member across and behind the driver. A so called “Petty” bar recommended to run from the center of the cage to the upper right front halo. A front engine bay hoop is allowed and may connect directly to the main cage. Bracing running from the top of the cage toward the rear should extend beyond the fuel cell area before attaching to the rear frame rails. All welds must be electric or mig and will be subject to the approval of tech inspectors. No offset cages are allowed. All roll bars in the driver’s area must be properly padded and taped. All suspension mounting points must remain in their stock locations. Front cross members may have the snout removed and plated for center link clearance. Structural X bracing will be permitted in the following areas of the chassis. Main frame rails may have X bracing above or under the fuel cell area. Downward supports from the main cage hoop to the rear clip may have X bracing. Rear frame sections may have 2" x 3" replacement tubing from the top of the kick-up rearward and must retain their original appearance. B) SHOCKS After-market racing shocks will be allowed but must be non rebuildable, stock style steel shocks in stock locations with stock style mounts. C) SUSPENSIONS AND FRAME All suspension and frame components must be stock for the year, make and model of the car. No modification of stock suspension locating points. Wheelbase must be a minimum of 101". Springs and steering components may be interchanged. All control arm rubber bushings may be replaced with urethane, plastic, steel, aluminum, or brass. Link kit lengths may vary from side to side. Springs may be stock or after market with a minimum size of 4 inches outside diameter. Spring spacers, front and rear, may be used and may be adjustable. OEM rubber mounting adapters or rear springs will be allowed. Top rear spring mounts may be manufactured and in stock location (non-adjustable). Multi-hole spring shackles will not be permitted on leaf spring applications. No “weight jacking” or weight transferring devices are allowed. Mono ball joints will no be allowed. No adjustable sway bars. D) WHEEL CAMBER Strut cars may alter front strut towers to adjust camber. COOLING SYSTEM No antifreeze permitted. An overflow can must be installed on the firewall, behind the right front tire. Aluminum radiators and electric fans are permitted. EXHAUST SYSTEM Muffler(s) are mandatory and catalytic converters may be removed. The exhaust must exit within 18" of the rear wheels. Pipes are to be cut flush to the body and above the frame rail or turned down at the exhaust end and exit under the car. Exhaust pipes should be firmly mounted high enough to avoid contact with the track surface during racing conditions. The exhaust cannot have any sharp edges or protrude outside of the body line. Original cast iron exhaust manifolds only. No Ram Horn manifolds or headers permitted. Maximum 2 1/4" pipe size before muffler and maximum 3" after muffler. Magnaflow muffler #11215 (2 1/4"), #11216 (2 1/2"), or #11219 (3") recommended (mandatory at Mosport). The step-up pipe from the exhaust pipe to the muffler is to be a maximum of 6" long. FUEL Pump fuel or track fuel permitted. The gasoline shall not be blended with alcohols, ether or other oxygenates. It shall not be blended with aniline or its derivatives, nitro compounds or other oxygen containing compounds. No NOS systems. FUEL SYSTEM A) FUEL CELL A fuel cell is mandatory and must be mounted in the center of the trunk area, with the filler inside the trunk. The fuel cell maximum capacity recommended is 15 gallons. The fuel cell must be separated from the driver’s compartment by an all metal firewall. There can be no openings in the firewall and any holes must be filled with metal. No filler neck or fuel line is permitted inside the driver’s compartment. The fuel cell must be firmly secured with steel straps to the floor of the trunk. A minimum of two straps front and rear and one strap side to side are required to secure the fuel cell to the chassis. The straps must be steel and a minimum of 1" x 1/8" flat strap or equivalent. Fuel cell protection bars are mandatory and must be constructed with a minimum 1 ¾” O.D. .095” tubing. The bottom of the fuel cell may be no lower than 13" from the ground to the bottom of the fuel cell and must be centered in the chassis from side to side. No electric fuel pumps are allowed unless on a fuel injected vehicle. All filler caps must be non-vented. No car will be permitted to run if any sign of fuel leakage is found. The mounting of the fuel tank is at the discretion of the tech inspector. Steel cased fuel filters only must be used. Fuel cell ground strap and fuel cap attaching devices are mandatory. B) FUEL SHUT-OFF There must be a fuel shut off valve in working order and mounted in the rear firewall or window parcel shelf accessible by safety personnel. It must be brightly and neatly marked “ON” and “OFF”. IGNITION & CHARGING SYSTEM OEM 12 volt stock ignition and must consist of stock or stock replacement parts only. No aftermarket high performance ignition systems or printed circuit type modules are allowed. A charging system is optional. KILL SWITCH MANDATORY in main battery line or the use of a Ford solenoid is permitted. Either system must be clearly marked and in easy reach for safety personnel. INTERIOR With the exception of the driver’s seat, all upholstery materials, trim and padding must be removed. Front and rear firewalls must have all holes and openings covered with sheet metal. The area between the fender and the firewall must be filled with sheet metal. The front firewall may be fabricated but must remain in stock location. Any holes or openings in the floor pan or trunk area must be covered with sheet metal. Original floor pan must be retained on the driver’s side of interior. A fabricated interior may be used on the passenger side of the car. For transmission clearance, the floor pan may be raised 12" above the original position of the driver’s floor pan. The passenger side floor may drop back down to its original height or maintain height of 12" to the passenger door. The rear firewall may be fabricated and may start behind the seat at the base of the roll cage and extend rearward to the base of the rear window opening. The rear firewall may not exceed the height of the rear deck. Any and all fabricated interiors must be built with a minimum of .022” gauge sheet metal. One only interior mirror is permitted. No fuel or brake lines or fuel filters permitted in the driver’s compartment. No plastic gauge lines are permitted. Roll bar padding is mandatory in the driver’s area. PAINT AND LETTERING Only those cars that are entered in the Thunder Car division and registered are permitted to prenumber their car. Numbers of members must be on the sides of the car in large (minimum 18") letters in a color that clearly contrasts to the paint job on the car. All cars of non-members must have sides and roof clear so the number assigned by the track official can be placed on the car. Sponsor’s name and logo may be placed any other place on the car. 4" number required on the right front of the car. Vulgar words and expressions are not permitted. RADIOS No radios unless track authorized one-way. REAR AXLE Welded locked rear ends or a steel mini spool are required. No posi-traction, aluminum or steel full spools are allowed. Rear end housing may be interchanged year to year. (E.g. 8 ½" rear end may be used to replace a 7 ½" rear end). If a 3 speed is used, the maximum rear end ratio is 3.23:1. If a power glide is used, the maximum rear end ratio is 2.73:1. SAFETY A) HELMET & APPAREL A driver’s fire retardant suit is mandatory and coveralls are not allowed. The driver and the suit must maintain a clean looking appearance. Fireproof gloves, neck collar, balaclava, underwear, socks, and shoes are recommended. No nylon shoes are allowed. A Snell 2000 SA recommended or newer approved racing safety helmet and complete driver’s racing suit must be worn in all practice and race events and until the car is parked in the pit area. B) BELTS AND HARNESSAll cars must be equipped with a quick release type, 5 point harness with a minimum 3" lap belt and shoulder harness of 3", properly affixed to the roll cage of the chassis with aircraft quality bolts no less than .375 (3/8) inches in diameter. A head restraint is strongly recommended. Seat belts must be dated and in excellent condition. C) FIRE CONTROL Cars must have a 2 ½ lb. minimum fire extinguisher with either steel or aluminum head mounted in a steel mounting bracket and must be bolted down within the driver’s reach with the seat belts fastened. The fire extinguisher must be serviced and inspected each year and dated no earlier than January 1st of the current year. D) SEAT An aluminum racing seat must be used and securely bolted to the roll cage and not bolted to the floor. When mounting the seat, use minimum 3/8" bolts with large flat washers to hold the racing seat to the seat framework. A minimum of two bolts on the seat back and two bolts on the seat bottom are required. The seat must be positioned completely to the left of the centerline of the car. An approved head restraint must be made of an energy absorbing material and headrest side plates are recommended. E) WINDOW NET A window net is mandatory with a minimum 3/8” rod and must have a quick release. TIRES TRACK TIRE RULE WILL APPLY. Specific track tire will be mandatory. TRANSMISSION You must use an automatic transmission unless your engine size is 3.5 litres or less in which case you may run a factory stock standard transmission, clutch and flywheel, but scatter shield protection must be used. No racing automatics and no after market valve bodies or manual valve bodies are allowed. Torque converters must be stock and be a minimum of 11" diameter for 8 cylinder engines. Aftermarket shift kits and shifters are permitted. All cars must have a working reverse gear. Transmission coolers are permitted but cannot be mounted in the driver’s compartment. Power glide transmissions will be allowed with a 50 lbs. penalty. Drive shafts must be stock, steel and painted white. Two drive shaft loops to fully enclose the drive shaft are mandatory. Loops must be no less than 2” wide and ¼” thick (or equivalent) and must be fastened to the chassis front and rear. WEIGHT Maximum left side weight is 53% and maximum rear weight of 45% with driver in car on 4 barrel carbureted cars. 55% maximum left and 50% maximum rear with 2 barrel carbureted cars and 6 cylinder cars. Minimum total weight is 3150 lbs. for V8s and 2800 lbs. for track approved V6s including the driver. 100 lbs. penalty for fuel injected V8s. No topping up with fuel after the feature. When adding ballast it must be in blocks of no less than 5 pounds, bolted in securely, painted white, numbered and have a 6" ground clearance minimum. WHEELS No reverse or aluminum type rims are permitted. Steel wheels only are allowed. Maximum rim width from bead to bead is 8". Heavy duty or racing rims may be used on all four wheels. The right front wheel MUST be a racing rim. Minimum of 5/8" studs required. WHEELBASE - TRACK WIDTH Track width will be a maximum of 64" measured at spindle height. ENGINES: BLOCK ASSEMBLY Only engines that were factory available for the make, model and year being run are permitted. No modifications to engine block, cylinder head, crankshaft, and camshaft or connection rods unless specified. Maximum
c.i. Block may be zero decked. No part of the piston can protrude above block deck. PISTONS OEM cast or forged pistons allowed. No high performance pistons. CAMSHAFT OEM style Hydraulic cams and valve lifters only. Double roller timing chains are allowed. Maximum
Valve Lift: CARBURATION Carburetor to be stock as supplied from the factory. No Holley carburetors on GM products. It must bolt to the original factory intake with no adapters. The following are mandatory: two throttle springs, running in two different directions, throttle stop at the carburetor, solid linkage (no throttle cable) and a toe bar. Cold air boxes are permitted, as long as they fit under the hood. No air ducting of any type allowed into the air box. CHRYCO and Ford may use a quadrajet carburetor. Fuel
injected motors may be used if it is available in the make/model/year
of vehicle being run. Choke accessories may be removed. No adaptor
plates are allowed. No truck carburetors. COMPRESSION RULE Maximum compression ratio of 9:1 and must not whistle above 9.4:1 if checked hot. CYLINDER HEADS Must be stock for engine being used with no modifications. NO DOUBLE BUMP TYPE HEADS. No 2.02 or vortec V8 heads are permitted. VALVES. Cylinder heads may be changed from year to year provided they are not high performance. Stock ratio rocker arms only. Screw in studs and guide plates are allowed. Valve
Size: ENGINE MOUNTS Solid engine and transmission mounts are permitted but engine must remain in stock location. FUEL PUMP Stock location mechanical pumps only unless running fuel injection. HEIGHTS Engine height will be a minimum of 12 inches measured from the ground to the center of the crankshaft. INTAKE MANIFOLD Original OEM cast iron manifolds only. No aluminum intake manifolds are allowed. Only OEM type gaskets are allowed and no doubling of gaskets under the carburetor. VALVES Valve stem diameter must be stock. Stainless steel or stock type valves are allowed. No turning of valve stems permitted. Undercut and light weight valves are not permitted. Dodge may use adjustable rockers.- WATER PUMP No aluminum pumps allowed on GM, stock OEM replacement pumps only. OIL PAN AND LUBRICATION Extra capacity aftermarket wet sump oil pans are allowed. Thanks & hope to see you at the Track. |