Williams Grove Speedway 2010
410 Sprint Car Rules & Regulations

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2010 410 SPRINT CAR SPEC

A sprint car is defined as a racing vehicle of single seat design, built up on a racing chassis and mounted on four (4) racing wheels. No rear engine cars or aluminum frames allowed. No boxed tubing frame rails. Driver’s compartment shall be separated from the engine by a firewall of suitable material. All cars must weigh a minimum of 1,375 pounds with driver following the completion of any event. No bolt on weight allowed.

Bodies —

The body should give the appearance of completely covering the car’s frame and should be fully painted.

All cars must run a full sprint appearing hood. Hood must extend to the front torsion tubes or a similar location on coil-over cars. The maximum outside hood width will be 30 inches. Hoods are mandatory during racing.

One-piece tail and fuel tanks are allowed, but must be streamlined. No side foils, rudders or panels are to extend beyond rear cage on any side, no body pieces to extend beyond or underneath front torsion tube except hood. No Wedges or foils underneath racecar. Side body panel designs or concave surfaces that, in the sole discretion of the Williams Grove Speedway Officials, are intended to trap, alter or direct air flow for the purpose of gaining an aerodynamic performance advantage will not be permitted. Any new body designs including, but not limited to side body panels, hood design, nose pieces and/or any other part of the exterior body must be approved by the Williams Grove Speedway Officials prior to being introduced to competition. No gurney lips or turnouts are allowed on any body panels.

Bumpers, Nerf Bars & Front Axles —

No TITANIUM, only nerf bars and bumpers made of steel at least one-inch in diameter will be allowed. Nerf bars, which offer adequate protection in the event contact with another car, are mandatory. Nerf bars must be bolted or roll pinned to the vehicle.

No pop rivets may be used to fasten nerf bars, bumpers or wings. Nerf bars may not extend past outside of tires. Maximum 8" front bumper or 23½ inches from the center of the front axle to front of bumper.

Rear bumper minimum thickness of .065".

Only steel front axles are allowed. Minimum sizes: 2" x .156, 2¼ x .120 or 2 3/8" x .095.

No front anti-roll bars are allowed.

Chassis —

Roll cage to be constructed to provide maximum protection. Gussets should be used in the driver’s compartment. The roll cage must be constructed high enough to cover the driver’s helmeted head. No elliptical tubing used on or as part of the main frame structure.

The driver’s right side opening must be a minimum of 10 vertical inches and 21 horizontal inches at all point.

Maximum wheel base of 90 inches, minimum wheel base of 83 inches.

Floor pans must be either aluminum or steel.

All cars must utilize either a drive line strap or a driveline hoop restraint constructed of .065 steel either welded or bolted to the chassis. Metal hoop restraints must react positively to magnet testing. The rear cross member used for mounting the steel driveline hoop must be constructed of .083 steel.

Drag links must utilize 4130 steel of at least 1" in diameter and a minimum wall thickness of .058. Tie rods and heim ends must be made of steel only. A magnet must stick at all times. No swedging of the tubing will be allowed.

Drag link must be tethered to the frame.

NO Cockpit adjustables (Wing sliders exempt).

The top of the roll cage shall have a maximum outside width of 29 ½ inches.

The cockpit horizontal middle frame bar will have a maximum outside width of 27 inches.

The bottom frame rail will have a maximum outside width of 26 ½ inches.

Any frame manufactured with safety bars or arm guards that protrude outward from the frame rails for the purpose of creating room for the driver will be permitted. The guards and/or panels must not extend more than 7 inches from the outside edge of the middle frame rails and must remain above the middle frame rail.

Radius rod protectors will be permitted. The maximum protector vertical opening will be 10 inches in height by 24 inches long and it must not extend more than 3 ½ inches from the outside edge of the bottom frame rails.

A maximum of 1 ½ inch wide by 20 inch long exhaust fume deflector, located on the bottom side-body panel at the rear edge will be permitted. The turnout angle must not exceed 90 degrees.

All other side paneling must be fabricated flat and must not extend past the outside edge of the frame rails more than the thickness of the paneling material.

Engines and Driveline ––

Maximum engine size is 410 cubic inches and all engine cylinders must be machined from steel alloy only. Only (2) valves and (1) spark plug allowed per cylinder. Double overhead cam engines are not permitted. No turbine driven engines, turbos or superchargers and no offset engines are allowed. No direct drives, no big blocks and no computer operated or controlled parts such as fuel injections and fuel systems.

No titanium rods, rod caps, crankshafts or headers allowed. Connecting rods must be 100% steel. There must be an inspection plug in the oil pan using either a #12AN fitting or a one inch pipe plug. If car is to be inspected and there is no inspection plug, oil pan will be removed for inspection.

The Brodix BD 2000 head and front mad drive block are illegal.

Only 16 fuel nozzles, utilizing two (2) per cylinder will be permitted. One (1) nozzle must be placed in the cylinder head and one (1) nozzle must be place in the injector.

Fuel and Cells ––

Approved fuel bladders are required and there must be a solid cover over the bladder. Fuel tanks cannot be altered or modified and must be one-piece construction of cross-link polyethylene plastic.

No carbon fiber fuel tanks.

No fuel additives – including but not limited to nitro, nitro methane, or nitrous oxide injection – are allowed. Only pure methanol or other approved fuels may be used.

Miscellaneous ––

No two-way radios or other means of electronic communications.

No mirrors of any kind may be used.

Drilling of any bolts, fasteners or heim ends is prohibited. No hollow fasteners allowed.

The use of electronic logic processors (this includes traction control devices) to control any function of the race car, and/or any system for continuous gathering of data from any function of the race car for which intended use is computer downloading, is strictly prohibited. (Penalty: Loss of Driver/Owner points for the year and loss of earning for the event infraction was detected)

One way radios are mandatory at all times when you are on the track. Failure to comply will result in a penalty of two (2) weeks to the rear of the next two heat races.

Tires and Wheels ––

The same right rear tire must be used for the entire racing program including heat and feature events. Cars qualifying through the Consolation or B-Main may use a different tire for that event but must use their heat tire for the feature.

- Tire Change between events

Car to be placed at the rear of the starting line-up for the next race. Tire manufacturer and/or compound MAY BE CHANGED.

- All time trial programs will require teams to use the same tire for all

qualifying events, but a new tire may be used for the feature. Tire Manufacturer and/or compound MAY BE CHANGED for feature.

- One-time exemption

Each team will receive one exemption (WG sanctioned races) for a tire change occurring after a qualifying event. When taking this exemption, (a WG official must be notified prior to tire change). The same manufacturer and compound MUST BE USED.

- One tire per show rule is not in effect for day shows.

- Hoosier tires allowed for front

- Goodyear tires are mandatory for left & right rear

Size Soft To Harder

FRONTS 200 400

Front 84.0/8.0 – 15 D2592 D2594

Matl. No. 206540 206551

REARS G100 G200 G300 G400

LR 93.0/15.0 – 15 D3031 D3032 D3033

Matl. No. 216164 216165 216248

LR 95.0/15.0 – 15 D3041 D3042 D3043

Matl. No. 216166 216167 216322

LR 97.0/15.0 – 15 D3051 D3052 D3053

Matl. No. 216251 216252 216267

RR 105.0/17.0 – 15 D3101 D3102 D3103 D3104

Matl. No. 216253 216254 216255 216273

Maximum wheel diameter is 15 inches. Right rear wheel max. width is 18 inches and left rear max. is 15 inches. No plastic wheels. Wheel covers must be fastened securely.

TOP WING

a) Center Foil maximum size of 25 square feet with a maximum width of 60 inches. Center Foil must be square or rectangular in shape with all 4 corners set at 90 degree angles with no variance allowed. Center foil top is to be flat from front to back and side to side.

b) Center Foil shall be fully sheathed in aluminum. Vent holes, dimples, ridges, etc. are strictly prohibited anywhere on the wing.

c) Maximum 1" removable wicker bill may be mounted on the rear edge of the center foil. Wicker bill must be 90 degrees to the top of the center foil. No built-in wicker bills or gurney lips allowed. Maximum dimension of wicker bill may change periodically.

d) The top wing can be cockpit/driver adjustable. Other than the slider mechanism, no moving parts permitted on or in foil structure. Only one slider mechanism allowed on top wing, allowing adjustment forward and backwards only.

e) Center foil thickness cannot exceed 9 inches. Underneath side of center foil must appear to be a continuous smooth arc with no recesses, concaves, or protrusions. Center Foil must be one-piece construction. No split or bi-wings will be permitted. Wings must be fabricated of metal alloys only. No fiberglass, carbon fiber or other similar material may be used in the basic framework of the wings. Top wing must not extend beyond outside of rear tires. 

f) No foils or rudders will be permitted anywhere on the top wing.

FRONT WING

a) Center Foil maximum size of 6 square feet with a maximum width of 36 inches. Center Foil must be square or rectangular in shape with all four corners set at 90° angles.

b) Center Foil shall be fully sheathed in aluminum. Vent holes, dimples, ridges, etc. are strictly prohibited anywhere on the wing.

c) A maximum 1" removable wicker bill may be mounted on the rear edge of the center foil. Wicker bill must be 90 degrees to the top of the center foil. No built-in wicker bills or gurney lips allowed. Maximum dimension of wicker bill may change periodically.

d) Maximum distance from the Center Foil front edge to the front edge of the front axle may not exceed 20 inches.

Wings ––

e) The Center Foil front edge must remain at least 1 inch behind the front edge of the front bumper. Center Foil top surface from side to side must remain flat.

f) Center Foil must be one piece. No split or bi-wings will be permitted.

g) Wings must be fabricated of metal alloys only. No fiberglass, carbon fiber or other similar material may be used in the basic framework of the wings.

h) The Front Wing must not extend beyond outside of front tires. The Front Wing may not be cockpit or driver adjustable while the car is stationary or in motion.

i) No moving parts permitted on or in foil structure. No rudders or fins allowed.

j) The 5" section located at the rear of the front foil must not have a belly/curl arc that is out of proportion with the rest of the front foil. As measured on a 5-inch straight edge, the belly at 2 ½ inches from the rear of the foil may not be deeper than 3/8 inch. There is zero tolerance on this 3/8 inch depth. It is suggested that the wing blue print specify 11/32 inch depth, so that if any deflection or movement of the wing occurs, the depth will not exceed the 3/8 inch specification (This 3/8 inch measurement ensures that the belly/curl arc is gradual).

k) The belly/curl arc must span the entire length of the front foil and appear to be a gradual arc with the deepest point, no further back than 12 inches from the leading edge. The belly/curl arc must start at the front foil’s leading edge and shall not exceed a depth of 2 inches. Front foil thickness cannot exceed 3.6 inches.

SIDE BOARD PANELS

a) All braces or supports shall be oriented thin edge to face the air stream. Only rectangular, round or oval metal braces not exceeding 1 inch in width may be used. No adjustable bracing allowed.

b) No aero elliptical brace material permitted.

c) No brace or support shall resemble a wicker bill or a split wing.

d) Side boards must be mounted square to the center foil and parallel to each other. No kick-out allowed.

FRONT

e) Front side boards maximum 12 inches tall and 26 inches long with no more than one inch overhang from the center foil front edge to the side board front edge.

f) Side boards may have front, back, top and bottom turnouts of no more than ½ inch.

TOP

g) Top wing side boards maximum size, 72 inches long and 30 inches tall. The top 2/3’s of each top wing side panel shall consist of only 2 corners. Each corner shall be set at a 90 degree angle with no

variance. This portion of the side panel’s leading edge cannot be behind the center foils leading edge.

h) Panels must be of one-piece construction.

i) Panels must be fabricated flat. Turnouts on all edges of the wing must not exceed 1 1/4" x 1 1/4" and must be orientated at a 90 degree angle to the flat portion of the side panel.

Suggested Safety Equipment ––

A. Arm restraints

B. Driving uniforms, flame retardant with a minimum of two layers. Underwear, head sock, gloves, foot socks and shoes should all be flame retardant.

C. Driver’s seat fume deflector/heat shield.

D. Fuel Shut-off Valve.

E. Full face Snell approved helmet – no more than 2 years old.

F. Head Rest Padding

G. High-back (stock car style) seats.

H. Kill switch in reach or drive.

I. Knee pads or padded steering.

J. Minimum 3 inch wide seat belts, no more than 2 years old, mounted to frame with bolts or looped over frame tubes, belts traveling through bottom of seat. Minimum 3 inch wide shoulder harness, double over the shoulder, military shoulder straps with anti-sub crotch belts. Harness to go over horizontal tube located less than three inches below the top of driver’s shoulders.

K. Neck collars.

L. Right head net or support. Head net equipped with a quick release capability.

M. Seat mounted to the frame with a minimum of three bolts.

N. Windshield screens are highly suggested with a minimum of .090 screens.

 

ANY CAR, TEAM OR DRIVER NOT MEETING WILLIAMS GROVE SPEEDWAY SPECIFICATIONS, OR STANDARD RACING SAFETY PROCEDURES AND EQUIPMENT, IS SUBJECT TO AUTOMATIC DISQUALIFICATION AND/OR PENALTIES.



Racing rules to be normally established and instituted rules of Williams Grove Speedway. For additional information or clarification, please contact Williams Grove Speedway at 717-697-5000 or by mail at: 1 Speedway Drive, Mechanicsburg, PA 17055