THUNDER CAR RULES

 

Frame, Chassis & Cage: - Interior: - Body: - Height:

 

 

Suspension, Steering & Brakes: - Gear Rule: - Weight: - Fuel Cells:

 

Tires & Wheels: - Transmissions Clutches & Driveshaft: - Engines & Exhaust: - Safety Requirements:

 
THUNDER CAR RULES 2012

This division is open to any North American built passenger car.  No station wagons, convertibles or trucks allowed.

Frame, Chassis & Cage:

  1. Main frame must be completely stock. Original Main Frame Rails must be maintained and must be complete perimeter style as originally produced. All suspension mounting points must remain in their stock locations. Upper Control Arm mounts may be relocated.  Stock mounts must be used.
  2. Front cross member may have snout removed and plated for center link clearance. Cross member may be notched to achieve engine height.  Outer frame area surrounding front spring may be cut away to achieve shock clearance or to easily adjust spring seats and spacers.
  3. Rear frame sections may have 2”x3” replacement tubing from the top of kick-up rearward. Tubing must be a minimum of .095 wall thickness and retain original appearance.
  4. Front and Rear sub frames, or uni-body frames, must be connected with 2x3 rectangular tubing with a minimum thickness of .095 inch.
  5. Main frame rails and/or front and rear clip sections may not be drilled or pierced or otherwise altered for the purpose of lightening.
  6. All cars are required to have a minimum 4 point roll cage. Roll cage must be symmetrical in all directions. Off-set cage structures will not be
    allowed.
  7. All roll cage material must be a minimum of 1 3/4 tubing. Wall thickness of tubing can be no less than .095 inch thick.
  8. Minimum of 4 curved, horizontal door bars required on drivers side with a minimum of two vertical bars between each horizontal bar.
  9. “X” type Door bars will be allowed on passenger side.
  10. Dash bar required, along with an “X” type member across and behind driver.
  11. A so called “Petty” bar must be present to prevent right front corner of halo from collapsing in the event of a rollover.
  12. Left leg protection bar must be installed between roll cage and left front frame rail.
  13. A front engine bay hoop is allowed and may connect directly to main cage.
  14. Bracing running from top of cage towards the rear, should extend beyond fuel cell area before attaching to rear frame rails.
  15. Roll cage must be professional looking and electrically welded. Subject to Tech Inspector’s approval.
  16. Structural X’ing will be permitted in the following areas of the chassis: Main frame rails may have X bracing under the floor in the center section of the car. Rear clip may have X bracing above or under the fuel cell area. Downward supports from main cage hoop to rear clip may have X bracing.

Bodies:

  1. PLEASE NOTIFY SPEEDWAY FOR APPROVAL ON ALL BODY CHOICES THAT MAY BE BEYOND THE SPIRIT OF A STREET STOCK DIVISION. ALL BODIES ARE SUBJECT TO TRACK AND TECH INSPECTOR APPROVAL.
  2. Body must be complete with all components. All chrome mouldings, door handles, nameplates and lights must be removed.
  3. Aftermarket bodies such as 5-Star Monte Carlo panels may be used. Chassis must maintain original location points for all components such as suspension and drive train, regardless of body used.
  4. Green house portion of bodies including, roof, A-pillars, B-pillars and C-pillars may be aftermarket and made of fibreglass. Hoods and Trunk Lids may also be fibreglass. Door skins, lower portion of rear quarter panels and front fenders may be fabricated. Doors must be steel. Upper portions of rear 1/4 panels and front fenders must be steel. Lower portion of quarter panels and fenders may be aluminum. Original dimensions must be maintained.
  5. All Body panels must be complete in length and width. Over all workmanship will be a determining factor whether a car will be approved for competition.
  6. Original wheel openings may be trimmed conservatively for tire clearance.
  7. All doors must be welded, bolted or riveted shut. 20 guage steel is recommended between door skin and door bars on drivers side.
  8. Inner hood bracing may be removed. If original hood hinges are used, 2 front hood pins are required. If hinges are not used, hood must have 6 pins. 4 front pins and 2 rear pins. Hoods may be steel or Fibreglass. Hoods may have a maximum of 3 inch raise, to accommodate air cleaner clearance.
  9. Inner trunk bracing may be removed. If hinged, trunk must have 2 pins. If not hinged, 4 pins are required. 2 front pins and 2 rear pins. Trunk lids may be steel or Fibreglass.
  10. Stock appearing bumpers for make and model must be used. Bumpers must be in stock position. After-market bumper covers may be used subject to approval of Kawartha Tech inspectors.
  11. Stock windshield is allowed. Lexan replacement is recommended. Minimum thickness of lexan shall not be less than 1/8 inch. Cars must have front windshields. Front windshield should have 2 internal braces constructed of material that is 1 inch wide and 1/8 inch thick, spaced 5 inches apart and centered in windshield. Rear window and side windows are optional. Top 5 inches of front windshield must be left available for Kawartha Speedway divisional sponsors.
  12. A maximum 5 inch rear spoiler with no bracing is allowed. Spoiler width may be no wider than rear deck lid of car. There may be no bends, lips or enclosures of an sort on upper portion of spoiler. Spoiler may not be adjustable.
  13. Rub Rails will be allowed. Must be neat in appearance.
  14. Minimum height of all body panels such as front bumper cover, rocker panels, side skirts, etc., will be 6” from the ground measured without driver in car.
  15. Roof must maintain a minimum height of 50” as measured 10 inches back from edge of windshield.
  16. A quality paint job is mandatory on all cars with high contrast numbers for legibility, day or night. Bodies must be kept neat and painted at all times. No
    metallic numbers.
  17. 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.
  18. Bodies must meet Tech Inspectors visual approval. Only approved bodies will be allowed to compete.

Interior:

  1. All upholstery materials, trim, padding and flammable materials must be removed.
  2. Interior may be fabricated, but pedals must remain in stock location.
  3. Interior of car must be completely enclosed in respect to engine compartment, track surface, tires and rear fuel cell compartment.
  4. 20 guage sheet metal is mandatory 18 inches high at foot firewall, 9 inches high along drivers seat and transmission tunnel and 18 inches high behind seat. Passenger side floor may drop back down to original height or maintain height of 9” to passenger door. All other interior panels may be built with a minimum of .040 aluminum.
  5. Rear firewall may be fabricated. Rear firewall may start behind seat at base of roll cage and extend rearward to base of rear window opening. Rear firewall may not exceed height of rear deck.
  6. A full width dash is required in all cars. Vertical surface of dash must project in a single plane across car. Top horizontal plane of dash should carry forward to front firewall and enclose entire area beneath windshield.
  7. Original trunk floor and rear wheel arches may be removed.
  8. Only one stock type factory mirror is allowed. No outside mirrors.
  9. Roll bar padding is mandatory.

Heights:

  1. All heights will be measured with driver out of car.
  2. Frame height will be a minimum of 6 inches measured from ground to lowest point of frame.
  3. Engine height will be a minimum of 12 inches measured from ground to centre of crankshaft.

Cross member may be altered to achieve crank height. Engine may not be moved left/right of original location. #1 spark plug of engine must be inline or ahead of upper ball joint.


Suspension, Steering & Brakes:

  1. No modification of stock suspension locating points will be allowed.  The exception shall be:   A) Upper control arm mounts, which may be moved, but mount must remain stock.  B) rear spring mounts which may be fabricated, but must be in   factory location.  C) Front and Rear shock mounts.
  2. Wheel base must be a minimum of 108"
  3. Maximum tread width will be 64” front and rear.
  4. Unless indicated otherwise, all suspension components must remain stock. Suspension components may be interchanged from different makes and models, but must be stock OEM equipment.
  5. Stock type steering box required. Rack and Pinion steering may be allowed based on year and model of car and chassis.
  6. Lower control arms must be stock and mounted in stock location. Lower control arms may be different lengths side to side to achieve desired camber. Measurement from center of lower ball joint to center of inner mounting point must have no more than a 1 inch variance from stock length in either direction. All lower control arm rubber bushings may be replaced with urethane or heavy plastic. Steel, aluminum, brass and mono-ball type bushings will not be allowed. Ford lower strut are allowed when used in a Ford chassis.
  7. Tubular upper control arms may be used. Control arm must be steel with the exception of the cross shaft which may be aluminum. Control Arm mounting points must remain in stock location. Cars utilizing strut type spring and shock assemblies, may alter front strut towers to achieve allowable camber.
  8. Spindles must be steel and stock type OEM. Spindle pin must be solid.
  9. Front hubs must be stock type OEM. Front hub and rotor assembly must be one piece and must be steel. Front hubs may be drilled to accept larger wheel studs. Rear hubs may be 2 piece, aftermarket, hub and rotor assemblies. Rotor must be steel. Wheel studs must be a minimum of 5/8”.
  10. Sway bar diameter may not be greater than1 1/4” as measured with vernier callipers. No adjustable sway bars. Link kit lengths may vary side to side.
  11. Chevy rear end housings may be interchanged year to year. (eg. 8 1/2” may be used to replace a 7 1/2”) Welded or locked rear ends permitted. No Posi-Track rear ends allowed.
  12. Ford 9” rear end housings may be used. Rear ends may have floating type bearing, hub and axle assemblies.
  13. Axle tubes must be steel. Gun-drilled axles are allowed. Mini spools are allowed. Full spools are allowed. Spools may be steel or aluminum. Ford 9” carrier (differential housing) must be steel. No cambered rear ends allowed. Rear wheels must be driven with solid flange drive plates. All running gear drainage plugs must be safety wired. NO TITANIUM PARTS ALLOWED.
  14. Rear disc brakes will be allowed. Any car utilizing this option, in a rear wheel drive car, will carry a 50 lbs. weight penalty.
  15. Rear  lower trailing arms must be within 1 inch +/- of stock length.  Rear  trailing arms may be stock type, fabricated, aftermarket and adjustable.  All  lower control arm rubber bushings may be replaced with urethane or heavy plastic. Steel, aluminum, brass and mono-ball type bushings will not be allowed.  Any Chevrolet cars utilizing a Ford 9” housing must use traditional Chevy 4 link trailing arm system.
  16. Springs may be stock or after market with a minimum size of 4 inch outside diameter.  Spring rubbers are allowed. If chassis used comes original with Leaf Springs, Leaf springs must be maintained in stock location and utilized.
  17. Front and Rear Load Bolts are permitted. Multi-hole spring shackles will be permitted on leaf spring applications.
  18. One shock per wheel.  Shocks may be relocated with fabricated mounts. After-market racing shocks will be allowed. Coil over type assemblies are not allowed.   Any brand of shock may be used.  Shocks must be steel.  Shocks must not be adjustable or re-buildable.  Shocks must not be gas or pressurized in any manner.  Shocks must maintain 50/50 valving.  Shocks utilizing split valving from compression to rebound will not be allowed.
  19. Brakes, (all 4) must be single piston callipers, or stock type drum assemblies on rear, must be made of steel and all 4 must be in good working order. Brake rotors must be a minimum of 3/4 inch thick and made of magnetic steel. Rotors, callipers and spindles may be used from different models. Master cylinder must be stock type for make and model. After market pedal assembly is allowed. If rear disc brakes are used, proportioning valves are allowed in brake system.

Gear Rule:

If running either an Automatic or Standard transmission, the final drive ratio must not exceed 5.00


Weight:

  1. All cars must weigh a minimum of 3200 pounds for any V-8 powered cars. (Driver Included)
  2. Maximum left side weight  on “Built Motor” cars will be 54%. (Driver Included)
  3. Maximum rear weight will be 45%. (Driver Included)
  4. Any car utilizing Crate Motor Option GM 88958602 must weigh a minimum of 3050 pounds. (Driver Included)
  5. Any car utilizing the Crate Motor Option will have a maximum left side weight of 55% (Driver included)
  6. Any car running a fuel injected V-8 will carry a 100 lbs. penalty. This is subject to change in the interest of competition.
  7. Any car utilizing a standard transmission will carry a 50 pound penalty.
  8. Any car competing with a V-6 engine will weigh a   minimum of 2800 lbs. and maintain a maximum of 55% left side and a maximum of 50% rear weight. (Driver Included)  This is subject to change in the interest of competition.
  9. All weights will be checked with driver in car—no substitutes.
  10. All ballast will be in blocks of no less than 5 pounds.
  11. Any cars wanting to utilize a Rochester 2 bbl. Carb will be allowed 55% left side and 50% rear.

Fuel Cells:

  1. Fuel cells are mandatory.
  2. Fuel cell maximum capacity—15 gallons.
  3. Fuel cell must be mounted in centre of trunk area, be centered between frame rails and maintain a height of no less than 13 inches from the ground to the bottom of the cell.
  4. Fuel cell must be separated from driver with an all steel firewall.
  5. No gas fillers allowed outside of body.
  6. A fuel cell protection bar is mandatory. Minimum 1 3/4 inch O.D. .095 inches thick.
  7. Fuel cell must be secured in rear frame section with a minimum of two straps around entire cell of material of no less then 2” wide and 1/8” thick and securely
    attached to frame.
  8. Fuel lines must be neoprene or steel. Lines must be securely fastened out of driver’s compartment.
  9. Steel cased fuel filters only.
  10. No electric fuel pumps unless a fuel injected vehicle is being used.
  11. All cars must have an operational fuel shut off valve mounted in the main fuel line that is easily accessible by driver and safety crews.
  12. Pump gas or track fuel only.

Tires and Wheels:

  1. Racing style wheels are mandatory. Steel only.
  2. Maximum width will be 8 inches measured from bead to bead.
  3. 15 inch diameter wheels only.
  4. All cars will be required to use track tire.

Transmission, Clutches & Driveshaft:

Automatic Transmissions - must be factory available for year, make and model car.
  1. No Racing Automatics allowed.
  2. Power Glide transmissions will be allowed.
  3. No after market valve bodies or manual valve bodies allowed.
  4. Torque converters must be stock.  Must be a minimum of 11” diameter for 8 cylinder engines. 
  5. After market shift kits and shifters allowed.
Standard Transmissions
  1. Any manual, stock OEM, 3 or 4 speed, steel transmission allowed.
  2. Stock type steel single disc clutch and flywheel.
  3. Clutch and pressure plate must be a minimum of 10 inches.
  4. Puck type or aluminum discs are not allowed.
  5. Flywheel must have a minimum weight of 14 pounds.  Flywheel must not be drilled or machined in any way.  Nodular or Steel Flywheels only.
  6. Must have an NHRA steel bell housing, Semi 6.1 flywheel shield or scatter shield of 1/4” steel.  Must be mounted over the clutch and flywheel 360 degrees between the bell housing and the floor.  Scatter shield is not permitted inside the car.
  7. Bell housing must have a 1/2” hole in it for turning of flywheel to whistle engines.
  8. After-market clutch pedal is allowed.
  9. Drive shafts must be stock, steel and painted white.

  10.  

Engines and Exhaust:

The following CRATE MOTOR OPTION will exist at KAWARTHA SPEEDWAY IN 2012:

Crate Motor # GM 88958602 will be allowed.

 

All internal components of this engine package will be inspected in accordance to the specs outlined from GM. This motor (other than internal specs) will be subject to all other criteria as outlined in the Engines and Exhaust section.

 

Crate Motor Option may run a 4412 Holley 2BBL carb as outlined in this section.

 

Crate Motor Option will receive a 100 pound weight break. This is subject to change in the interest of competition.


Build Motor Option:

  1. Maximum cubic inch allowed:

    GM Ford Chrysler
    350 351 360 (maximum overbore .040 allowed for clean up)
  2. No modifications to engine block, cylinder head, crankshaft, camshaft or connecting rods unless specified.
  3. Block may be zero decked. No part of the piston can protrude above block deck.
  4. OEM cast or forged pistons are allowed. No high performance pistons.
  5. OEM style hydraulic camshaft and lifters only.
    OEM style hydraulic camshaft and lifters only. Maximum Valve Lift::
    GM 410 Int. or Exh.
    Ford 419 Int. or Exh.
    Dodge 412 Int. or Exh.
  6. Double roller timing chain allowed.
  7. Cylinder head must be stock for engine being used. No modifications to cylinder head allowed. Double Bump style heads are not allowed. 202 cylinder heads or Vortec V-8 heads are not permitted.
  8. Cylinder head may be changed from year to year provided they are not high performance.
  9. Compression limit 9.0:1 on tear down and 9.4:1 with the whistler.
    Maximum valve size –
    GM Int. 1.94 Exh. 1.60
    Clevland Int. 2.04 Exh. 1.65
    Windsor Int. 184 Exh. 1.64
    Dodge Int. 1.88 Exh. 1.60

    Stainless steel or stock type valves are allowed. Valve stem diameter must be stock. No turning of valve stems permitted. Undercut and/or light weight valves are not permitted.

  10. Nitrated rocker arms are allowed. Must maintain stock ratio. Dodge may use adjustable rockers.
  11. Guide plates may be used.
  12. Extra capacity, wet sump, steel oil pans, are allowed.
  13. No external oil pumps allowed.
  14. Screw in valve studs, are permitted.
  15. Factory stock carburetor only.Max. single 4 bbl. Must bolt to original factory intake. No adapters allowed. CHRYCO may use quadrajet- carb. Fuel injected motors may be used if it is available in make/model and year of vehicle being run. Choke accessories may be removed. Adapter plates are not allowed. If Rochester carb is used, max. bore diameter is 1”- 1 1/16” and max. boost venturi bore diameter is 1/8”
  16. Carburetor must be old style, Holley #4412. Specifications will be as follows: Metering block #’s 5924, 5925 and 10570.
    1. metering block power valve channel restriction ports ( 2 holes behind the power valve) max. .0635
    2. metering block idle feed restriction ports ( 2 holes) max. .035”
    3. metering block main passage to discharge nozzle ( 2 holes ) max. .141”
    4. main body high speed air bleeds ( 2 holes ) max. .028”
    5. main body idle speed air bleeds ( 2 holes ) max. .074”
    6. butterfly ( throttle plate ) thickness .0398” - .0438”
    7. hole in butterfly .090” - .096”
    8. butterfly must have ID # 215 stamped in it
    9. throttle shaft diameter .368” - .369”
    10. throttle shaft thickness at flat of shaft .152”
    11. venturi bore diameter 1.373” – 1.377”
    12. boost venturi inner bore diameter .377” - .383”
    13. boost venturi outer diameter .610” - ,630”
    14. throttle bore diameter 1.6855” – 1.6865”
  17. No re-working of carburetor other than removal of choke plate, filling of choke rod hole, changing of jets and power valve. One piece solid carburetor adapter will be allowed. Carb adapter and gasket combined thickness must not exceed 1.25 inches. No ram air style systems allowed. Air to engine must enter through cowl area and air horn of carb

  18. Solid throttle shaft ( gas pedal linkage) must be . used. No cable types allowed.
  19. Original cast iron intake only allowed. No . aluminum intakes permitted.
  20. E-Vac systems will not be permitted.
  21. Original cast iron exhaust manifolds only allowed. No Ram Horn exhaust manifolds or headers are permitted.
  22. Exhaust pipes may be a maximum of 2 ¼” before   mufflers and be a maximum of 3” after muffler.  Mufflers must be used.  The step pipe between pipe and muffler may be no longer than 6 inches.
  23. Exhaust must extend beyond driver compartment and may either exit out right side door or may be turned down towards race track and exit under car.
  24. Cold air boxes are allowed. No “Ram Air” type systems permitted.
  25. OEM 12 volt stock ignition. Must consist of stock or stock replacement parts only. No after market high performance ignition systems.
  26. Electrical system must have a main SHUT OFF SWITCH and must be within reach of driver and accessible to safety crews.
  27. Aluminum radiators, water pumps and engine pulleys are allowed
  28. Electric cooling fans are permitted.
  29. Solid engine mounts are allowed.

If your motor has been properly sealed by the party approved by Kawartha Speedway, Peterborough Speedway, Mosport Speedway, Sunset Speedway, Capital City Speedway, Varney Speedway or Barrie Speedway and that documentation is verified, you will be considered legal to compete and not be subject to tear down. This does not exempt you from any inspection that can be performed with out breaking seals.


Safety Requirements:

  1. All drivers must wear approved safety helmets (minimum Snell 2005 standard). SA rated helmets only. No M rated helmets allowed.
  2. Fire retardant suit is mandatory. Fire retardant gloves are mandatory and fire retardant shoes are highly recommended.
  3. Aluminum racing seat mandatory.
  4. Driver’s seat must appear as close to stock position as possible. Seat must be securely fastened to roll cage and frame members.
  5. 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.
  6. An approved driver’s window net is mandatory.
  7. It is mandatory that all cars have a 21/2 pound fire extinguisher with gauge, aluminum head and steel mounting bracket. Extinguisher must 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.
  8. Two-Way radio’s are not allowed.

 




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