Mosport Speedway 2006 Limited Late Model Rules

Mosport Speewday Limited Late Model Rules
2006, 2007 AND 2008 RULES

1) BODY STYLE

A) Any North American built fiberglass, aluminum, or steel car

B) No Jeeps, station wagons, or convertibles. Pickup trucks are allowed on car chassis at Mosport.

2) BODY APPEARANCE

A) The body must be stock appearing and in stock position on the frame. Bodies are to be template style; 5 Star, ARP etc. and must be aftermarket and made of steel, aluminum or fiberglass. . No carbon fiber body parts permitted. Rubber front and rear bumper covers are recommended. No wedge style, slab side or high performance bodies or DIRT noses allowed.

B) When using a fiberglass roof, it is recommended a minimum 20 gauge steel panel be installed below the roof in driver’s compartment.

C) Wheel opening flares cannot extend past scrub rails. Wheels must not extend outside body or scrub rails.

D) Absolutely no bars shall extend outside of the body panels including the grill and bumper with the exception of side scrub rails. Scrub rails must extend no further forward than the rear of front wheel opening, and no further rearward than the front of the rear wheel opening with a maximum size of 1" x 2" welded or bolted to the roll cage with no sharp edges protruding. When bolting on scrub rails, you must use carriage bolts or round-headed bolts. If hex head bolts are used, they must be countersunk.

E) Grill and headlights must retain their original appearance.

F) Minimum ground clearance is 4" (four inches) at the lowest point of the body or skirt and 5" (five) at the frame to the ground, excluding the front cross member but including ballast weight (without driver).

G) Body height will be a minimum of 46 inches, measured 10" behind the top of windshield on the roof centerline (without driver).

H) Crush panels, minimum 0.040” aluminum, can be used to separate the body panels and the windshield from the interior.

I) The rear spoiler height is 5" maximum with a maximum width of 62". Any lip on top edge of spoiler is included in the 5" maximum height. No bracing or side pods. At the point in which the spoiler bends and raises vertical, it cannot extend beyond the edge of the rear deck and must follow the contour of the rear deck lid. The maximum spoiler height is 39" with a 46” roof height and 40” with a 47” roof height and is measured from the ground to the top of the spoiler.

J) Cars must be equipped with a cable or chain located at the front and rear of the car for towing purposes.

K) Doors must conform to original shape and be securely mounted using bolts, rivets, or welding. No sheet metal screws allowed.

L) Hood must resemble a stock hood in appearance. Original manufactured hood scoops only are allowed. Exterior hood hinges are allowed and must have 3 front hood pins. If the hood is removable, it must have 2 front pins with center hold down or 3 front and 2 rear hood pins. (No carbon fiber hoods or body panels allowed).

M) The trunk deck lid must be hinged or easily removable for easy access in case of fire.

One 12 volt battery only and it must be anchored securely and separated from the driver’s compartment by a firewall.

Stock type steel single disc clutch and flywheel units must not be drilled or machined. Stock type clutch and pressure plate must be used with a minimum 10" diameter. Clutch disc may be puck type and must not be constructed from aluminum. Nodular steel flywheels are allowed. Bell housing must be a NHRA steel type, Sema 6.1 flywheel shield or scatter shield or 1/4" steel. Must be mounted over the clutch and flywheel 360 degree between the bell housing and the floor. No scatter shield inside the car is permitted. At your own option, the bell housing should have an inspection plate for easy inspection of the clutch assembly. If there is no inspection plate on the bell housing, you may be required to remove the transmission for clutch inspection.

Minimum flywheel weight is 14 lbs. A mandatory ½" hole in the bell housing for turning the flywheel is required when whistling your engine.

B) Four-wheel disc brakes are allowed.

C) A dual master cylinder with a balance bar is allowed.

D) No aluminum calipers or alterations of calipers and rotors. Steel single piston calipers must be used. Rotors must be a minimum ¾” thick. Caliper mounts must be constructed of Steel only.

Bumpers must be an original type, securely fastened with all metal bracing and/or reinforcing concealed behind bumpers with cut-off ends. Bumpers must not be wider than the width of the body. The bumper height must be a minimum of 15" and a maximum of 18" from ground, measured from the center of the bumper.

A) Unless otherwise specified, all suspension parts are to be stock with no modifications.

C) Absolutely no offset chassis allowed. Perimeter chassis only is permitted and must conform to Item G below for frame rail dimensions.

D) The wheelbase will be a minimum of 104" on a full frame chassis and the frame rails can be altered to meet this measurement. Wheelbase must be within 1 inch from one side to the other side. (I.E. 104" minimum, 105" maximum) of the car at all times. A maximum of 66" of track width is allowed.

F) A factory production stock front clip may be used from the firewall forward. Fabricated front clips are allowed but must meet the following specifications; tubular front clip rule 2" x 3" or 2" x 4". Factory front clips must extend from in front of the steering box rearward to the main rail. Frame may be built out of 2" x 3" or 2" x 4", minimum .095" wall thickness. Underslung rear section must run 25 lbs of penalty weight or 50 lbs. of ballast mounted 8" over top of the rear end center housing (50 lbs. from total weight and not 50 lbs. of penalty). On front 2" x 3" clips you must run 40 pounds of ballast in front of the cross member. On 2" x 4" clips you must run 25 pounds of ballast in front of the cross member. On both styles of

fabricated clips, the weight must be split equally and mounted to each frame rail. All ballast weight must be painted white and marked with the car number and must use self-locking nuts or drilled and wired nuts on mounting bolts. The ballast must also be easily removed for weighing purposes.

The bumper crush tubes, located at the extreme ends of the frame rails, may be constructed with smaller material to accommodate front and rear bumper installation.

Lower control arms must remain in stock location and will be checked on a regular basis with a portable measuring device.

A stock steering box is mandatory and aftermarket center link, aluminum tie rod sleeves, and Heim joint tie rod ends may be used. No rack and pinion steering systems can be used.

Cross member vertical side members must be a minimum size of 2" x 3" rectangular tubing and a wall thickness of no less than .095'. Cross member bottom horizontal piece must be minimum size no smaller than 1.5" x 3" x .095" wall thickness.

G) Chassis rails must be of equal distance from the centerline of car. Main frame rails must be no less than 24" outside of rail to center line of chassis.

H) Chassis from front firewall rearward may be fabricated from no less than 10" circumference by .095" box tubing with no holes drilled for lightening purposes.

I) Front coil springs, strut rods, and sway bars may be interchanged, provided they fit original mounting and are not altered from stock appearance and position. Sway bar must be mounted to lower control arm and may be adjustable. Strut rods may use heim ends (Ford).

K) Hubs may be drilled for larger wheel studs with minimum 5/8" wheel studs being mandatory.

L) No coil over suspensions or coil over eliminators allowed. A Minimum 4" O.D. coil spring is allowed and spring rubbers may be used.

M) Cars must use stock type cast, forged or fabricated solid pin spindles. Front hubs must be steel only (no aluminum hubs).

O) Any steel front upper control arms may be used. Upper control arm shaft must be stock type steel or aluminum. No heim ends. Sliders allowed.

P) Stock O.E.M. lower control arms must remain in stock mounting position. Left lower control arms can be altered in length to assure positive camber. Measurement from grease nipple to mounting hole in frame must be within l inch of factory specifications at all times. Lower control arms cannot be reversed from side to side. Ball joint can be realigned to eliminate binds.

Q) One shock per wheel. No air shocks, or coil over spring inserts allowed. Racing shocks allowed (position optional). No remote adjustable, rebuildable or aluminum racing shock absorber is allowed.

Must have steel 360 degree retaining loops ¼” by 2" positioned at the front and rear of the drive shaft within 6" of each u-joint. Drive shaft must be painted white or fluorescent. No accessories may be driven off or attached to drive line.

B) Maximum cubic inch size is Chrysler and AMC 360, Ford 351 and Chev. 350 with a maximum overbore of .060".

Cars using a 104" to 107" wheelbase, the engine must be located so as the front most spark plug is no further back than the center of the upper ball joint with zero tolerance. A car with a wheelbase over 107" has a 1” tolerance.

E) Camshaft - Hydraulic flat tappet cam only allowed. Offset camshaft key allowed. Must run stock size lifter bore for engine being used and no lifter bore sleeving is allowed. Chryslers exempt. No belt-drive systems or multiple gear drive systems permitted.

1) Stock O.E.M. or World products or Dart cast iron straight plug only. No other aftermarket cylinder heads allowed.

2) World Products cylinder head part #43600-1, #43610-1, casting #I-052 or Dart SR heads are allowed for GM. Maximum intake runner volume for both brands of heads is 170 cc.

3) No porting, polishing or port matching of cylinder head, intake or exhaust manifolds; and no porting, polishing or relieving under the valves. Stock only.

4) No special lightened valves. No titanium valves. No turning of valve stems. An undercut valve may be used. Ball method will be used to test valve stem to seat clearance. Ball size is .787 for intake and .531 for exhaust.

General Motors: Intake - 1.94' Exhaust - 1.60"
Ford Cleveland: Intake - 2.04" Exhaust - 1.65"
Ford Windsor: Intake - 1.94" Exhaust - 1.64"
Chrysler Corp: Intake - 1:88" Exhaust - 1.60"

I) Engine must use factory specs for bore and stroke. 6" rods allowed, no aluminum or fluid dampers, OEM steel elastomer - type balancers only. Aluminum pulleys allowed. Mosport and Peterborough are 5.7" rod and 48 pound minimum crank weight on GM engines with no knife edging or bull nosing.

K) Intake Manifold - These manifolds must remain as manufactured. No port matching or flow work permitted. Manifolds must not be painted. All part numbers are current design Edelbrock Performer series intake manifolds. 1^st design manifolds with the same part number are not permitted. Approved manifolds are: Chevy #2101, Chrysler #2176, Ford Cleveland #2750, and Ford Windsor #2181.

Carburetor adaptor to be one solid piece, with no modifications and with gasket is not to exceed a thickness of 1.25".

1) Stock cast iron 2 ½” maximum outlet exhaust manifolds only unless using the crate engine part #88958602 which may use Schoenfeld headers #135, 135H, & 145.

2) Notching of cross member allowed to accommodate exhaust manifold. Cross-member must be properly plated so it is not weakened.

3) No polishing or matching of ports, must bolt to head without spacers and remain in stock position.

1) The maximum O.D. of the exhaust tubing is 2 ½" up to the muffler and 3" after the muffler or 3" all the way from the crate engine.

2) Pipes must be firmly mounted and exit ahead of the rear tire. 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. If using mufflers with a 3" inlet and outlet a step up tube may be used for a maximum length of 6". Magnaflow #11219 (3" inlet, outlet) or Magnaflow #11216 (2.5" inlet, outlet) recommended, mandatory at Mosport.

3) No collector pipes, 2 into 1 or collector boxes allowed. Cross over is allowed.

The gasoline shall not be blended with alcohols, ethers, or other oxygenates and it shall not be blended with aniline or its derivatives, nitro compounds or other oxygen containing compounds. No NOS systems.

One R4412-500 C.F.M. Holley factory stock produced two-barrel carburetor only. The only changes allowed are jets, power valve and removal of choke parts. Two throttle return springs and stop are mandatory. Carburetor hats are allowed and air cleaners are mandatory. An accelerator toe bar is mandatory. Air filters boxes are permitted. No boost venturi below the throttle plate. No ram air systems. A quick change jet kit (part #3425 float bowl) may be used. No Keith Dorton performance carburetors.

*           Metering block must have the following ID# stamped on it. Factory stock #5924 or #5925. The #10570 will appear on replacement or service metering blocks.
*           Metering block power valve channel restriction ports (2 holes behind the power valve) maximum .0635".
*           Metering block idle feed restriction ports (2 holes) maximum: .035".
*           Metering block main passage to discharge nozzle (2 holes) maximum: .141".
*           Main body high speed air bleeds (2 holes) maximum: .028".
*           Main body idle speed air bleeds (2 holes) maximum: .074".
*           Butterfly (throttle plate) thickness: .0398" - .0438".
*           Hole in butterfly: .090" - .096".
*           Butterfly must have stamped on it ID #215.
*           Throttle shaft diameter .368" - .369".
*           Throttle shaft thickness at flat of shaft: .152".
*           Venturi bore diameter: 1.373" - 1.377".
*           Boost venturi inner bore diameter .377" - .383".
*           Boost venturi outer diameter .610" - .630".
*           Throttle bore diameter 1.6855" - 1.6865".
*           All air entering the engine for combustion purposes must enter through the air horn of the carb.

2) Car must be self-starting and have an ignition kill switch within reach of the driver on the left hand side of the car.

3) Stock single-point distributor and stock type coil is allowed. No dual points.

4) OEM electronic ignition may be used and require stock type coil and stock type ignition modules. (No Mallory or MSD type systems allowed.)

Race cars must be self-starting. NO push starting. Starter must be in stock position and functional.

B) Front firewall does not have to be original, but must use a minimum 22 gauge steel. Passenger side of firewall may be moved as far back as the front of the roll cage, to allow for easy access to the drive line, and may be .040" aluminum.

C) A metal firewall of 22 gauge steel must be securely fitted over the rear seat back brace. The top shelf behind the driver’s seat must completely close off the trunk compartment and may be constructed of .040" aluminum.

D) All sheet metal work must be neat and properly fitted. All holes are to be covered with sheet metal either welded or riveted.

E) Floor must be complete and have all holes covered with sheet metal. Step up over transmission/drive shaft tunnel to the right roll cage uprights can be a maximum height of 10" from driver’s floor and a minimum of 22 gauge steel.

A) Cars must have a 2 ½ lbs minimum fire extinguisher with a steel or aluminum head mounted in a steel mounting bracket and must be bolted down and within driver’s reach with seat belts fastened. Fire extinguisher must be serviced and inspected each year and dated no earlier than January 1^st of the current year.

B) Driver’s fire suit is mandatory. No coveralls. Driver and suit must maintain a clean looking appearance. Fireproof gloves, contoured neck collar, balaclava, underwear, socks, shoes and Hans or Hutchins type devices are highly recommended. No nylon shoes allowed.

B) The fuel cell must be mounted between the frame rails (no notching of the rails allowed) and the bottom must be mounted with no less than 9" ground clearance. Fuel cell must be secured with steel straps made of 1" x 1/8" or equivalent, not less than two lengthwise and two crosswise, full 360 degrees.

C) Fuel cell must have left side, right side and rear hoop protection bars, minimum 1 3/4 x .095" tubing.

D) Fuel cell must have a one way check valve in the vent line and have a shut-off valve installed in the fuel line which is accessible to the driver and the safety crew and it must be clearly marked OFF and ON.

E) The gas cap must have an appropriate attaching line to prevent its loss. A ground strap from the tank to the chassis is mandatory.

F) Steel fuel lines must be used and neoprene can be used for connection purposes only. Fuel lines must be securely fastened under the floor. No copper lines are allowed. Metal fuel filters only.

14. Oil line to oil pressure gauge must be braided, copper or steel line. No plastic lines.

All cars must be neatly painted. Numbers assigned by the track must be painted on both sides of the car and roof, with a minimum 20" high by 3" wide letters (roof numbers read from right side) of a color offering a distinct contrast to the color of the car. No trick numbers. 4" numbers on both headlight and tail light caps are required. Block type numbers 6" high, white in color, must be displayed on the upper right hand side of the windshield.

Must be in stock location and include a 1-gallon metal overflow can securely mounted ahead of engine firewall and under the hood. No antifreeze. No remote rads.

Any three of four point hook up may be used. Lower arms must not exceed 30" from mounting holes on rear end of mounting holes of frame. Upper arms must not exceed 30". Rubber biscuits allowed at one end of trailing arms. Panhard bar must be a one-piece solid type. Heim joints are allowed. Rear springs must maintain same mounting location from side to side.

A) Rear ends to be welded, mini spool or full spool only. No aluminum or titanium parts excluding the spool and the differential housing (3^rd member).

A) Cage must be constructed of 1 3/4 inch round steel minimum outside diameter by .095" wall thickness.

D) The roll cage must be braced to the rear frame kick-ups and diagonally between the rear uprights.

F) A minimum of four horizontal bars must be inside the left side door and three bars inside the right door and a minimum of two vertical bars between each horizontal bar. Minimum 40” length by 14" high, 16 gauge metal between door bars and body skin on drivers side is recommended on all cars.

G) A center overhead bar running fore and aft between transverse members is recommended.

I) All roll bars in the driver’s area must be properly padded and taped with foam rubber.

J) Left leg protection bar must be installed between roll cage and left front frame rail. All welds will be subject to the approval of the tech inspectors.

A quick release lap belt of no less than 3-inch width and 3-inch shoulder harness is mandatory. Belts must be securely fastened to frame and/or roll cage with minimum ½ inch grade 5 bolts or equivalent. A crotch belt is mandatory and seat belts must be dated within the last 3 years or be in excellent condition. Padded steering wheel hubs are mandatory and no one piece steering columns.

A Snell 2000 SA recommended or newer approved racing safety helmet and complete driver’s fire suit must be worn in all practice and race events. Goggles and a full face helmet are highly recommended.

An aluminum racing seat must be 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 seat framework. A minimum of two bolts on the seat back ant 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.

All entries are required to use a brand of tire that is approved by the track management.

24. TRANSMISSION

A) Any manual stock OEM transmission that bolts up to stock engine without alteration may be used. No special engine transmission adapter plates permitted and all gears must be operational.

B) Automatic transmissions must remain stock as produced and transmission cooler is highly recommended. The torque converter must be a minimum diameter of 10". No rebuilt torque converters are allowed.

Car weights are 55% maximum left side and 50% maximum rear. All ballast weight must be mounted safely and securely and no lower than 5" ground clearance. All weight must be labeled with car number and painted white. Added weight must be in block form in no less than five-pound blocks. Cars will be weighed and teched after racing as they come off the racetrack with the driver in the car and without topping up with fuel. Minimum weight is 3,000 lbs. for a sealed crate engine, 3050 lbs with a maximum compression ratio of 9.5:1, 3100 lbs with a compression ratio of 9.6:1 to 10:1 and 3150 lbs for a Ford with headers.

Maximum wheel width allowed is 8 inches with a minimum weight of 17 lbs. No aluminum, magnesium, wide 5 bolt pattern wheels, or wheel spacers allowed.

A) Windshields must be safety glass with 4 safety clips or lexan. No plexiglass allowed.

B) Window net mandatory with minimum 3/8 inch rod and it must have a quick release latch.

D) Front windshield center bracing mandatory. A minimum of two secure braces must be on the inside of the car. No exterior bracing, front or back.

E) No added film spray tinting permitted. Minimum side window openings 22" length x 14 ½” high.

F) No obstruction of driver’s view, in or out of race car, with the exception of the top 4" of the front windshield for sponsor decal. No letters or numbers on rear window.