The following specifications
have been prepared by Thunder Sprint committee as guidelines for the construction
of a 360 Sprint Car that will race in this class. No warranty of safety is expressed
or implied as a result of this publication of rules. These rules are intended
as a guide and are in no way a guarantee against injury or death to participants,
spectators, or others. Anything not covered by these specifications should be
approved by the committee and placed in writing. Continuous development in auto
racing and technology may mandate changes in these specifications.
This class was developed for the fun and excitement of Sprint Car Racing in a cost effective fashion. This requires limits in various areas to keep competition equal and fair for all participants. In order to accomplish this, if it doesn't say you can, don't! With the help of participants, this can be accomplished. Live within the spirit of the rules. If you have any questions, please contact a committee member before you are found illegal for competition.
DEFINITION OF OEM: Original equipment (OEM) is defined as engines and other
components originally produced by an American manufacturer for passenger or
light truck use, as produced on an assembly line and in an unaltered or modified
state. Special racing equipment is not considered OEM.
ENGINE: Any automotive V8 produced by an American automotive manufacturer for passenger car or light truck use. Maximum cubic inch displacement of engine to include clearance and wear is GM 363 C.I., Mopar 366 C.I., Ford 363 C.I. total. The original block assembly may not exceed the maximum cubic inch rule. Example: NO sleeving large cubic inch engine to reduce the cubic inch displacement. NO mismatching rods crank or block. NO titanium parts anywhere accept the following, valve retainers for durability. Engine size will be checked by a pump.
BLOCKS: NO aluminum, Bowtie, or Ford SVO blocks, must be OEM. NO grinding or altering of block to take weight off.
HEADS: Spec. GM cylinder head allowed is the Dart-Iron Eagle cast cylinder head. To order straight plug head use #10321112, for angle plug head use #10311112. spec cylinder head for a Ford will be the World Products Roush Windsor cast Iron cylinder head #053020. Spec. cylinder head for a Mopar will be the Mopar RT cast iron cylinder head #P5007141. Intake valve size 2.02 GM, Ford and Mopar, exhaust 1.60, intake runner 200cc GM and Ford (Mopar 186cc), chamber 64cc, either straight or angle plug is ok. Heads must match block manufacturer.
SPEC. HEAD: The spec. head
will be available in two configurations for GM, Ford and Mopar:
BARE - You supply your own parts.
COMPLETE - The GM Dart 200cc head, will have fitted 23 degree bronze valve guides
and a three angle valve job, 2.02 and 1.60 stainless steel valve, 11/32 valve,
200cc intake runner, 10 degree locks and retainers (for durability, titanium
retainers are the only titanium pieces allowed in the engine), guide plates,
7/16 studs.
Heads may be re-surfaced. All valve seats and guides (23 degree) must remain
in the stock location as supplied by the manufacturer. Cylinder head serial
numbers can not be altered in any way. NO angle milling. NO relocating head
bolts. NO additional material can be added. NO shaft mount or pedestal mount
rocker system allowed. Stud mount rockers or roller rockers and assembly only,
guide plates, head studs and stud girdles optional and allowed.
PISTONS: Flat top pistons only. 11 to 1 compression rule. Compression will be checked by a whistle.
RODS: OEM or steel after market rods 5.7 or 6.0 measured on crank and pin centers can be use. Ford and Mopar must run standard length rods. NO aluminum rods. NO titanium rods. All rods will be inspected by a magnet via sight hole in upper left side of oil pan.
CRANK: OEM cast, steel or any 3.500 max stroke after market crankshaft, i.e. Scat, Crower etc. will be allowed. Race prep. to a crankshaft could include 1/8 cross-drilled, heat-treating for extra strength, chamfered oil holes, end to end index check and polishing. NO mismatching crankshafts and blocks. Crankshaft must remain stock stroke; crankshaft may be balanced. Counterweights can not have knife edging or be cut off. NO ultra light crankshafts allowed. Minimum weight limit is 50 lb.; all other cranks are illegal and will be monitored closely. Fluid balancers, after market main caps and studs are allowed.
CAMSHAFT AND LIFTERS: Flat tappet cam and lifters only. Roller rockers are allowed. NO roller cams. NO roller lifters. NO mushroom cam or lifters. OEM lifter size only. NO shaft mount or pedestal mount rocker system allowed.
INTAKE MANIFOLD: GM spec. intake manifold is the Edelbrock #2901 Victor JR 2 bbl. (Fel Pro gasket #1205 matches the Dart heads). Ford spec. intake manifold is the Edelbrock #2941 Victor JR 2 bbl. Mopar spec. intake manifold is the Mopar #P5249501 4bbl. with a 2bbl. adapter; carburetor must be centered on adapter (Fel Pro gasket #1213 matches the Mopar RT heads). NO changing of intake runner length except as stated (the only altering to the intake runner length is to straight mill either side of the intake flange and or front and back of intake base, this is only to allow intake to set down and line up correctly on milled heads). NO porting or shaping. NO air holes permitted between the top of the Carburetor and intake valve. NO external or internal modifications or altering are permitted except as stated above.
CARBURETOR: One two-barrel stock configured Holley carburetor 1 11/16-throttle bore not to exceed 500 CFM. Up to a one-inch adapter/spacer plate will be allowed. Carburetor will be visually checked using a go-no-go gauge. Carburetor venturi bore, throttle plate bore and throttle shaft diameter must remain stock size and will be checked using a go-no-go gauge (throttle butterflies and screws can be stainless steel). NO egg shaping or grinding out stock casting ring in venturi bore. NO replaceable venturis. NO special coatings other then stock anodizing to carburetor. Billet metering blocks with adjustable jets are allowed. Oversized and dual inlet float bowls are allowed. NO solenoid. NO fuel injection, super charger, turbo charger, nitrous oxide or water injection will be allowed.
IGNITION: Any type of ignition will be allowed.
FUEL PUMPS: Any mechanical fuel pump will be allowed. NO electric fuel pumps.
FUEL: Alcohol only. A fuel shut off valve is required within reach of the driver. Sprint Car fuel cell and bladder is mandatory, tail tank minimum 25 gal. size. NO vinyl or plastic fuel lines permitted. NO Performance-enhancing additives allowed for alcohol, this will be checked closely.
OIL PUMP: Wet sump only. Oil pan type optional. A one-inch diameter inspection hole in the upper left (driver) side of the oil pan above the oil level and windage tray is required for inspection of crank and rods. NO dry sump or external pumps.
WATER PUMP: OEM steel or aluminum water pump and or Sprint Car aluminum front cover type crankshaft or cam drive water pump is allowed.
TIRE/WHEEL: Must run Hoosiers on all four corners, the fronts and left rear are open compound, the spec. right rear tire will be a Hoosier 104x17x15 DT3; tire must durometer a minimum 45 cold. NO chemically softening or conditioning of tires. Siping or grooving is ok. Aluminum racing wheels are required and both rear wheels must have bead lock.
BODY: Must be Sprint Car style only, with hood extending all the way to front torsion bars. Tail tank minimum 25 gal. size. Sail panels and or sissy bars must be standard production size and placement. Any radical design will not be permitted to race. Sprint car must have a rock guard attached to the front of roll cage.
CHASSIS: Sprint Car must be a regular production Sprint Car up right with engine mounted in a vertical position and centered in frame. Driver must seat behind the engine, NOT to the side of engine or drive shaft; any radical design will not be permitted to race. Minimum wheelbase will be 85 inches measured from the center of the front hub to the center of the rear hub on the shortest side. Maximum wheelbase will be 100 inches measured in the same manner. Chassis and roll cage will be constructed of chromoly steel tubing of 1 3/8 inch minimum and of .095 wall thickness for the top main rails and roll cage. NO titanium. Must have minimum three wheel brakes (inboard brake on rear axle counts for two brakes). NO transmitting or listening devices in car. NO computer monitoring or downloading. NO adjustable shocks that can be adjusted by the driver from the cockpit or crew while racing.
WINGS: Top and nose wing is mandatory. Center may be a maximum of 16 square feet total (either 4x4 or 3.6 x 5). Top center body must be straight from sideboard to sideboard. Top panel of center curvature cannot exceed three inches front to rear, to be measured with a straight edge from the top leading edge to the trailing edge, not to include the rear vertical lip. Rear vertical lip may be a maximum of one inch and must be at a 90-degree angle to the trailing edge. Side panels may be a maximum 10 square feet. Lips on panels' may not exceed 1 1/2 inches. NO flap or rudders may be attached to the side boards or center section. Top wing must be run in a center position side to side. Nerf bars can not be covered so as to give the effect of a wing. All wings must be constructed in such a manner that NO hydraulic or mechanical adjustments can be made by a driver from inside the cockpit.
SELF START: Sprint Car must be self-starting. A SFI certified flexplate/flywheel with starter is required or any Thunder Sprint Car approved self-starting system is allowed (no clutches). Flexplate is to be enclosed top and sides by either an aluminum or steel cover, which will act as a scatter shield. Battery is to be located under driver's seat and enclosed (leak proof, dry cell or gel type battery is required). A power shut off switch from the battery is to be located in the cockpit area.
DRIVELINE: Quick-change rear end is required. All drive lines must be enclosed and contain no more then one U-joint or CV joint and must be at the front of the drive line. Torque tube loop or strap is mandatory.
HEADERS: Header must merge into a collector and point to the rear of car and or to the side (no mufflers at this time).
TRACTION CONTROL: No traction control devices of any kind, either mechanical or electrical.
PROTEST: Will consist of the following and can be made only by an owner of a car. If car that is being protested is found to be within tech, that car owner will receive the money that was put up by the one who protested. Tech committee can tech cars at anytime. If a car/driver is found to be cheating, you will be permanently suspended. This is the only way to control this.
PROTEST FEES: Engine-$350.00
Fuel-$350.00 lab
Carburetor-$50.00
CONDUCT FOR DRIVER AND CREW: The driver is held responsible for the team he/she is driving for. If a problem arises for any reason only the driver can bring this to the tech official in a professional manner. In certain situations or infractions tech committee could take till the following Wednesday before making a ruling, the most important thing is not how fast we rule on a decision, but that we make the right ruling. If at any time the language gets out of control or one person touches another person this is grounds for immediate disqualification for the night or the entire year.
SAFETY: Safety equipment required will be, neck collar, gloves, arm restraints, two layer minimum fire suit- no older then three years old, five point safety belts-no older then two years old, racing shoes, snell 95 helmet, drag link strap and a helmet catch net on drivers right side of roll cage. Sprint car must have a rock guard attached to the front of roll cage.
RULES AND GUIEDELINES: Thunder Sprint will set and monitor the rules for the growth and benefit of Thunder Sprint racers. Thunder Sprint officials are empowered to make addendum to the rules at any time to make sure competition is fair and equal.
POINTS: Driver must take the green flag in his/her heat to receive points.
"B" Feature Points.
75 Points will be awarded to all drivers that take the green in the B main, but don't qualify for the "A" Main.
***If a driver is takes one lap in hotlaps and has a problem where he/she can not start the heat or feature the driver will receive 60 points for the evening.
The top 3 finishers from the "A" feature will go to the tech area immediately after the feature, or you will be disqualified of points and money for that night, if the driver gets out of the race car or stops at his/her pit area prior to stopping at the tech area.
Feature Points:
1.- 150 2.- 146 3.- 144 4.-142 5.-140 6.-138 7.-136 8.-134 9.-132 10.-130 11.-128 12.-126 13.-124 14.-122 15.-120 16.-118 17.-116 18.-114 19.-112 20.-110 21.-108 22.-106 23.- 104 24.-102
Thundersprint 305 Sprint Rules for 2006 (these rules are to be aligned with LA Speedway's rules) |
||||||||||||||||||||||||||||||||||||||||
|
ENGINE RULES 305 Chevrolet blocks only. Casting number must match list shown in Table 1 (below). Casting numbers must be visible and unaltered. Maximum bore is .060 for a maximum bore of 3.796. Any flat top piston is allowed. No titanium valves or rotating parts. No aluminum or titanium connecting rods. Water pumps must be OEM style. No crankshaft mounted or electric pumps allowed. No computer operated or controlled parts, fuel systems, ignition components, etc. No roller cams. No roller hydraulic cam. Cams not to exceed 0.555 lift at valve. Lifters stock diameter 0.842.Wet sump only. No external oil systems. The oil pan must have an inspection hole of ¾" minimum diameter and ½ inch maximum extension. Location is optional, but the tech officials must be able to view crank throws and rods from this hole. CARBURETOR 4 barrel 750 cfm, maximum. 1 11/16 inch throttle bore maximum. No work allowed in Venturi to increase air or fuel flow. Venturi must measure 1.410 maximum. No working on throttle plates. No part of carburetor, intake, or air cleaner allowed above the hood. Mechanical fuel pumps only. No tunnel ram intakes. Dial-a-jets may be used. No airflow adjusting devices may be located in the cockpit. NO ELECTRIC FUEL PUMPS. CRANKSHAFTS Must be stock appearing with 3.48 stroke. No undercut counterweights. No knife edging. May not have holes in rod journals. HEADS Any General Motors 305 head listed in Table 2 (below) may be used. No VOR-TEC. No center bolt. No unshrouding valves. No porting or polishing. No angle milling. No titanium valves. No shaft rockers. No port matching on heads or intake. Maximum valve sized 1.94 intake 1.50 exhaust. Casting numbers must be plainly visible and unaltered. FLYWHEEL AND STARTER REQUIRED Each car must have a flywheel and starter and be capable of starting and moving forward without being pushed. The car must self start at least once during each race session. Flywheel must be fully enclosed if mounted behind motor plate. Flywheel mounted in front of motor plate must be enclosed at top and both sides. Motor must remain in front of upright. BATTERY AND IGNITION SYSTEM Magnetos, Point or Electronic Ignition are allowed. Battery must be securely mounted and fully enclosed. Gel-cells recommended and gel-cells need not be fully enclosed. No electronic traction control. TIRES AND WHEELS Sprint Car wheels and tires only. Tires can be any compound. WINGS Top wing mandatory. Not to exceed 25 square ft area. Width not to exceed width of rear wheels. Wicker Bill not to exceed 1 inch in height measured from the upper wing surface. Side boards not to exceed 30 inches high x 72 inches long. Right side board cannot obstruct drivers view in normal running position. No hydraulic wing sliders allowed. Wing cannot be adjustable from cockpit while car is in motion. No pneumatic air cylinders allowed. Front/Nose wing are allowed, but not mandatory. Surface area not to exceed 24 inches long by 37 inches wide. Side board maximum 12 inches high by 24 inches wide. No wedges or foils underneath race car. No pieces may be added to the basic frame as to resemble, imitate or be specifically designed to deflect, trap or form a wind break of any nature, except those used to cool or protect the motor and braking system. TABLE 1Block Casting Numbers From: Catalog of Chevy V8 casting numbers
TABLE 2Head Casting Numbers From: Catalog of Chevy V8 casting numbers
|