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2008 410 SPRINT CAR SPEC

A sprint car is defined as a racing vehicle of single seat design, built upon 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. 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. 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 23 ½ 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, 2 ¼ 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 mainframe structure.

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

Maximum wheelbase of 90 inches, minimum wheelbase of 83 inches.

Floor pans must be either aluminum or steel.

All cars must utilize either a driveline 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.
 

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 mag drive block are illegal.

Fuel and Cells

Approved fuel bladders are required and there must be a solid over 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 carbon fiber may be used. Exceptions are brake rotors and wheels.

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 earnings for the event infraction was detected).

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.
- Tire compounds legal for competition at Williams Grove Speedway will be Hoosier – SC12, SC15, SCRD15, SC25, SC55.

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.


Wings

TOP WING (dish/flat option)
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 thickness cannot exceed 9 inches (MUST comply by May 9, 2008 dish option).

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

c) No wicker bills or Gurney lips permitted on Center Foil. Flat Wing Option: Wings with flat Center foils may utilize a 90 degree 1” wickerbill/turnup on the trailing edge 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) The 12 inch section located at the rear of the Center Foil must not have the belly/curl arc out of proportion with the rest of the Center Foil. The belly/curl arc must span the entire length of the Center Foil and appear to be a gradual arc with the deepest point no further back than 48 inches from the leading edge. As measured on a 12 inch straight edge, the belly at 6 inches from the rear of the Foil may not be deeper than ½ inch. There is zero tolerance on this ½ inch depth. It is suggested that the wing blue print specify 15/32 inch depth, so that if any deflection or movement of the wing occurs, the depth will not exceed the ½ inch specification. (This ½ inch measurement ensures that the belly/curl arc is gradual.)

The belly/curl arc must start at the radius of the Center Foil’s leading edge and shall not exceed a depth of 2 ½ inches. Underneath side of center foil must appear to be a continuous smooth arc with no recesses, concaves, or protrusions. Center Foil top surface from side to side must remain flat. 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 (except for dish option).


TOP WING SIDE 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) 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 (must comply by May 9, 2008 dish option). This portion of the side panel’s leading edge cannot be behind the center foils leading edge. Panels must be of one-piece construction. Panels must be fabricated flat. Turnouts on all edges of the wing must not exceed 1 ¼” x 1 ¼” and must be orientated at a 90° degree angle to the flat portion of the side panel.  Side boards must be mounted square to the center foil and parallel to each other with a ¼ inch variance allowed.

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 of a 1” wickerbill is permitted on all front wings (except for any sanctioned races). For sanctioned races a car that is outfitted with the Flat Top Wing Option, in which case a maximum 1” removable wicker bill may be mounted to 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.

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.

FRONT WING SIDE PANELS
a) 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.

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

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 PENALITIES.

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