Rules
The focus and the main theme is "Dirt Cars" racing on pavement and that will be what the Scrutineer will assess in all interpretations of the rules
1 MOTOR LOCATION: Motor must be located at least 7" from the bottom frame rails to the centerline of the crankshaft, and centrally mounted within the frame rails. Motor plate measurement to lower birdcage bolt must be between 38 and 45”. An aluminum belly pan/ engine diaper is recommended under the engine to prevent oiling down the track. This pan should be mounted at front of motor and extend back to rear motor plate and outward to each frame rail. The Idea here is we are racing Dirt Cars on Pavement.
2 MOTOR; Steel Chevy small block only, 360 Cubic inch maximum displacement (360 plus
1% =363.6) No stroker kits of any description. No Titanium in engine, excluding valves,
valve retainers, and cam drive spud. Aluminum heads are allowed. Only the original
23 degree valve angle heads can be used. No canted valve heads, no roll over heads.
All aluminum heads must remain within 1 degree of the original 23-
3 CARBURETOR: You may use up to a maximum of 750 CFM, fuel pumps can be manual or electric. Electric pumps are only allowed provided they are pulling fuel, and the pump must be solely contained in front of the driver within the engine bay.
4 SILENCERS: A recognized brand of silencers, i.e. Schonfield/ Morroso, must be fitted prior to racing on any track with a mandatory noise limit rule.
5 HEADERS; All headers must have a collector With a maximum id. of no more than 4”.
6 FRAME: Dirt car steel frames only and must be produced by a recognized manufacture,
no specials, or home builds allowed . Minimum wheelbase 83 inches. Maximum wheelbase
93”.Minimum car weight limit is 630 kgs race ready excluding driver, with no added
ballast. It is recommended that all chassis built in 2005 or later have a manufacturer’s
unique serial number plate prominently attached by welding on the left side front
roll cage upright. No roadster type chassis permitted. Chassis must be provided with
a minimum of 6 mounting points to securely mount the seat. Drag links must be tethered
to the frame with nylon webbing of at least 1 inch width. The maximum width that
is permitted for the opening at the top of the roll cage is 27 inches. No bracing
that would prevent the driver’s ability to exit through the opening or inhibit safety/rescue
crew’s ability to extract the driver will be permitted in the center of the top cage.
No elliptical (oval) tubing can be used on or as part of the main frame structure.
No front anti-
7 WEIGHT REDUCTION: D.I.Y Drilling of any bolts, fasteners, or heim ends is prohibited.
8 ROLL CAGE; Driver’s head/ helmet must not protrude outside cage. The fitment of a halo is recommended
9 DRIVER COMPARTMENT: Rock screen is mandatory. Aluminum full containment seats only.
Metal fume guard recommended. No in-
10 GAUGES AND ELECTRONICS: No transmitting devices. No electronic monitoring computer
devices capable of storing or transmitting information except tel-
11 BODY: Must be of ‘sprint car’ design and in a secure, professional condition at all times. No body work shall in anyway not look like a standard dirt /pavement car . No side pods. No lexan wind deflectors or extensions. No ground effects. The underside of the fuel cell must not be closer than 4" from the Track. The driver’s right side opening must be a minimum 10 inch vertical opening at any point and a minimum 21 inch horizontal opening at any point. No side foils, rudders or panels are to extend beyond rear cage support bars on any side. Sheet metal/fiberglass may not extend rearwards beyond the triangle created by the rear rails from the torsion bar tubes to the roll cage uprights. Body panels or sheet may extend downward past shock mount to horizontal bar at driver's compartment. No gurney lips or turnouts are allowed on any body panels. Bottom frame rails behind driver’s seat cannot be enclosed. No wedges or foils underneath race car. No body pieces to extend beyond or underneath front torsion tube, with the exception of the hood. All cars will be required to run a full hood. The hood may be a multiple piece design, it must appear to be one continuous piece. Hood must extend to the front torsion tubes. Sunshields cannot restrict driver vision.
12 FRONT BUMPER:. The front bumper may not extend more than 8 inches from the frame or 23½ inches from center of front axle to front of front bumper. No part of the car can extend past front bumper. No body pieces to extend beyond front torsion tube except hood.
13 REAR BUMPER:. Must be steel or stainless steel only. Minimum 1” diameter x minimum .065 thickness. A cage, under pod is recommended.
14 SIDE NERF RAILS : Must be steel with a 1” diameter and minimum wall thickness of 0.65”. Must be mounted within 1” of the of the outer part of the tires. A twin rail type is recommended.
15 WINGS: Top wings are 25 square Ft. with 30"x 72” side boards maximum. A maximum of 2.5” banana and maximum of 2” wicker bill mounted on the rear only. Nose wing can be up to 6 square Ft with 12"x 26” sides maximum. Wings must be mounted in the normal "Dirt" position. Top Wing must not hang over the Left Rear Tire. They must be even with the leading edge of the Left Rear Tire (No Tolerance) . Both wings must be positioned central to the frame. No offset slots in internal runners. You may use hydraulic cockpit adjustable wings. No other aerodynamic effects allowed. All braces or supports shall be oriented thin edge to face air stream. Only rectangular, round or oval metal braces not exceeding 1” in width may be used. No adjustable bracing allowed. No aero elliptical brace permitted. No brace or support shall resemble a wicker bill or a split wing. Sideboards must me mounted square to the center foil and parallel to each other. No kick outs allowed.
16 DRIVE LINE: Must be completely enclosed. Drive line hoop or strap is mandatory and must be on centerline of chassis. Hoop should be welded or bolted in.
17 FRONT AXLES:. Must be steel only. Minimum sizes 2” x .156 or 2 1/4” x .120 or 2 3/8” x .095 or 2 1/2” x .095. up to 53”wide
18 SUSPENSION & SHOCKS : Torsion bar suspension only. No cockpit adjustable weight
jackers. No cockpit adjustable shocks. All shocks must be of aluminum or steel construction
only. Shocks can be user-
19 STEERING: Only left hand side steering allowed with a minimum pitman arm of 12". A 1” nylon web tether must to be fitted to steering drag link arm if using a one piece drag link.
20 WHEELS: Aluminum wheels only. The right rear wheel is limited to 18 inches wide and the left rear wheel is limited to 15 inches wide. Front wheels are a maximum of 10”. No plastic or carbon fiber wheels are permitted.
21 WHEEL SPACING: The outer edge of right rear wheel rim can measure no more than 45" from the center lower bolt of the rear end.
22 TIRES: ‘American Racer’ tires only. These are a controlled tire size and compound only to be purchased from Pantech Autos. No other tires are to be used whist competing. No tire additive (softener) allowed.
23 BRAKES: There must be no more than 4 working brakes on all cars. However 3 working
brakes are acceptable with 2 fronts and 1 rear inboard. If you choose 4 working brakes
there will be 2 brakes in front, 1 on left rear or 1 on right rear and 1 inboard
(rear). Duel Master-
24 Personal Safety Equipment
A.) Each competitor is the solely responsible of for the effectiveness and
proper installation, per the manufacturer’s specifications, of personal safety
equipment and determining it to be adequate for competition at every event.
Each competitor is expected to investigate and educate themselves for
continuing improvement regarding their own personal safety equipment.
3.2 Seat Belt/Restraint System
A.) Each car will be equipped with minimum of an SFI 16.5 or SFI 16.1 approved
restraint system, until the date of the belt expiration (two years from the date
of manufacturer). Seat belt restraint systems shall be installed and used in
accordance with manufacturer’s instructions.
B.) Seat belt material should not be permitted to come in contact with any sharp
or metal edge, including when the material passes through the seat.
3.3 Protective Clothing
A.) All drivers will be required to wear a fire resistant driving uniform meeting
minimum of the SFI 3.2A/5 specification and display a valid SFI 3.2A/5 label.
B.) All drivers should wear fire resistant accessories including but not limited to;
head sock, under garments, shoes, and socks.. All drivers will be required to
wear fire resistant gloves. Shoes and gloves will be required to meet minimum
of the SFI 3.3 specifications and display a valid SFI 3.3 label.
3.4 Seats
A.) Aluminium and/or carbon-
and/or SFI rating will be permitted. All seats must be mounted to the
frame as required by the seat and chassis manufacturer.
B.) All areas surrounding the head should have padding.
C.) A right side head restraint net and/or support are required. All head
restraint nets should be equipped with quick release mechanisms.
3.5 Helmets
A.) All drivers will be required to wear a full-
Snell safety rating of SA 2010 and/or SA 2005 and/or a valid SFI 31.1,
SFI 31.2 and/or SFI 31.1 2000 label.
B.) It is strongly recommended that helmets should fitted with the Eject ™
helmet removal system.
C.) Head and Neck restraints are strongly recommended. The head and neck
restraint system must be mounted and connected to the helmet per the
helmet manufacturer and head and neck manufacturer instructions.
D.) Arm restraints are recommended and must be connected and used as instructed by the manufacturer
25 FUEL SYSTEM: You may carry a maximum 5 gallons of fuel in your tank/ bladder if
using an alloy tank it must be foamed in place and be double sealed , the vent must
be to the bottom of the pod if using a tank. Reinforced fuel pipe and fittings only.
Fuel shut off tap must be fitted in reach of the driver
26 TRANSMISSION AND DRIVE SHAFT: 2 Speed direct drive gearbox with integral clutch, reverse optional. Drive shaft (torque tube) must be fully enclosed. Drive shaft strap required.
27 TRACTION CONTROL:. Traction control devices are strictly prohibited. The Scrutineer may at his discretion, confiscate any item suspected to be related to traction control at any time.
28 OTHER ELECTRONIC DEVICES:. No computer operated or controlled parts, such as fuel injections, fuel systems, chassis adjusting systems, etc. are permitted. 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 the race car for which the intended use is computer downloading, is strictly prohibited.
29 SEAT BELTS: Properly mounted professional racing-
30 SAFETY GEAR: High-
to Snell SA95 or newer spec.
MISCELLANEOUS: No two-
SAFETY: Any car determined unsafe by the Scrutineer will not be allowed to race. Racing components of aluminum and magnesium have a limited life for safety purposes. It is advised that such parts are not repaired or used beyond their recommended safe life usage. Parts to be cautious of include, but are not limited to: wheel centers, live rear axles and top wings, torque tubes and link bars.
COCKPIT ADJUSTERS: No adjustments within the drivers reach inside or outside of the
cockpit except for fuel shutoff and one way wing slider -
only.
If you would like a copy of these Rules emailed to you please email: uksprintcars@gmail.com
