2012 UMP Street Stock Rules
Drivers in this class will receive UMP Stock Car Regional & National Points
RaceCeiver radios are REQUIRED
Mufflers are MANDATORY!
General rules for drivers and crew apply in addition!
-Driver must wear a fully approved fire suit, racing gloves, neck brace, and a full face-racing helmet SA 2000 or newer when on the track.
-Must be in working order, mounted for easy removal and with-in reach of the driver. (NO TAPE, CLAMPS, ZIP TIES).
-If windshield is removed you must have (3) vertical steel rods in front of the driver, (protective screen is optional). All other glass must be removed.
-Racing approved (5) point racing belts are mandatory and must be securely mounted to roll cage.
-A borrowed car must be from the same division. A car cannot be run in two features in one night. A car can only be run in championship races in a single division. Street Stock cars are limited to American 1950 to 2005 passenger cars only. Must maintain stock appearance.
A.) The engine and body must be manufactured by the same company.
B.) The number one (1) spark plug must align itself in a perpendicular line with the center of the upper ball joint for each manufacturer.
C.)The engine block must be cast iron.
D.) Cast iron cylinder heads of any make are permitted.
E.) Roller Rocker or Roller tip rocker arms will be permitted.
F.) Roller Cams and roller lifters are NOT permitted. Roller and/or mushroom-type lifters will NOT be permitted. (NOTE: 1″ inspection hole in intake will help with tech inspection.)
G.) Cast Iron or Aluminum intake manifolds will be permitted.
H.) Aftermarket exhaust headers will be permitted. The direction of the exhaust flow must exit away from the car and the track surface.
I.) Racing-type and/or specific racing-type distributors will not be permitted.
J.) MSD boxes and/or any other ignition amplifier boxes of any type will not be permitted.
K.) One 500 CFM 4412 Holley carburetor is required.
1.) The original choke tower must remain in its stock position and configuration. 2.) The choke blade may be removed.
3.) Any other alterations to the body of the carburetor, internal working mechanisms, venturis, throttle plate and/or any other part and/or component of the carburetor will not be permitted.
4.) Only mechanical fuel pumps will be permitted.
Transmission & Driveline
A.) The transmission must have a minimum of at least two forward gears and one reverse, plus neutral position.
B.) Only OEM production type transmissions will be permitted – two speed, three speed, four speed and automatic.
A.) Any manual-type transmission must be in an OEM or OEM replacement case.
B.) In manual-type applications only an external steel and/or aluminum, single or multi-disc clutch inside an explosion-proof steel bell housing will be permitted. The bell housing must be a minimum 270 degrees around top of clutch/flywheel area.
C.) Special purpose, after-market type racing transmissions will not be permitted.
A.) Any automatic-type transmission must remain in an OEM or OEM replacement case, with a functioning OEM appearing pump.
B.) The original OEM bell housing must have an approved scattershield constructed of minimum 0.125″ inch by three (3) inch steel, 270 degrees around flexplate. Manual bump starts will be permitted.
A.) The driveshaft must be a minimum two (2) inch diameter and made from magnetic steel.
B.) The driveshaft must be painted white and clearly labeled with the car number on the white portion of the driveshaft.
C.) A 360-degree drive shaft loop will be required and must be constructed of at least 0.25″ inch by two (2) inch magnetic steel, and/or one (1) inch diameter tubing, mounted six (6) inches behind the front universal joint. A second drive shaft hoop is recommended and must be placed within 12″ inches of the front universal joint.
A.) Only American manufactured cars and/or full-size “uni-body” type cars will be permitted.
B.) All vehicles must maintain a minimum of 107″ (inch) wheelbase.
C.) Altering of stock frame, with the exception of repair to the original frame to maintain original specifications will not be permitted. Repairs that will be acceptable will include patching of holes and/or rust (ed) areas of the frame. Repairs will be approved at the discretion of DIRTCAR Officials and/or local track officials.
D.) The rear frame may be replaced from the rear shock absorber mounts toward the rear of the car.
A.) The minimum weight requirement at all times will be 3,200 lbs (pounds).
B.) All weights must be securely mounted with two (2) 1/2″ (inch) bolts securing them to the frame in a positive manner. The weight(s) must be painted white with the car number clearly marked on them. All weights must be mounted under the body of the car.
Fuel Cells and Fuel
A.) Only gasoline-type fuels will be permitted. E-85 OK. No Methanol.
B.) The fuel cell must be securely mounted in the rear of the car and secured with straps. It is recommended that the fuel cell be mounted solidly to the rear frame rails of the vehicle in a fabricated manner.
C.) All fuel cells must be enclosed in a metal container.
D.) The fuel cell must be a steel container with a minimum of two (2) one (1) inch by 1/8″ (inch) steel straps on each side of the container to mount the fuel cell.
A.) The body, frame and engine must match the manufacturer. The body, body mounting position and overall appearance must retain all stock OEM dimensions. All glass, chrome and upholstery must be re- moved from body prior to competition. The body must be made from magnetic steel.
B.) It is Mandatory that three (3) support bars fabricated from magnetic steel tubing, a minimum of 1″-inch diameter and .095″ wall thickness be spaced equally in front of the driver and welded to the top roll cage bar and the dash bar of the roll cage in a vertical manner.
C.) The floor pan and firewalls must be stock in appearance and be complete on both the driver and passenger side of the vehicle. The floor pan and firewalls (front and rear) may be repaired and/or fabricated, but must retain stock appearance and stock material thickness.
The front of the rear firewall must maintain the same height as the top of the front of the dashboard.
D.) The driver and passenger compartment must remain open from left to right exposing the stock appearing floor pan and to the rear seat firewall and shelf. You may run from the top of the transmission tunnel over to the right door. NO INTERIOR DECKING.
E.) The body, including fenders, quarters, hood, roof, decks doors must be magnetic steel and remain stock or approved stock in appearance. Aluminum doors ok. Fiberglass hood ok.
F.) Plastic aftermarket front nose will be permitted provided they are approved and stock appearing for the year, make and model of the car. Late Model type aerodynamic noses will not be permitted.
G.) Rub/side rails may be attached flush to the body from the fender well to the rear quarter panel.
H.)The window openings, front and/or rear, driver and/or passenger side must retain their stock OEM dimensions.
I.) Mirrors of any type are not permitted.
J.) The back of the hood must be sealed off from the driver’s compartment.
K.) The front bumper must remain stock. Sharp edges will not be permitted. Both sides and ends of the bumper must be capped. Tube-type front bumpers will be permitted. Tube-type bumpers must have capped ends.
L.) The rear of the car must be enclosed. The rear bumpers may be covered and must have round edges and connect solidly to the frame. After-market rear bumper covers will be permitted provided they are approved and stock appearing for the year, make and model of the car.
* 8″ tall x 60″ wide maximum.
* Maximum Height: 8″ Total Material With Maximum of 3 Vertical Supports.
* Maximum Dimensions On Spoiler Supports: 12″ Long at Bottom, 8″ Tall at Rear. 8″ Tall May Extend 4″
Forward From Back Then Taper To a Maximum of 2″ Tall at Front. (SEE DIAGRAM IN PRINTER FRIENDLY DOWNLOAD)
A.) All suspension components must remain stock in their OEM mounting locations for the year make and model of the vehicle with the exception of racing shocks and/or springs that are mounted in stock locations.
B.) Aftermarket steering wheel and quick release are permitted.
C.) Steering quickening devices are permitted.
D.) Only stock OEM-type bolt-in upper ball joints will be permitted. Adjustable and/or truck type ball joints will NOT be permitted.
E.) Only DIRTcar approved Tubular-type A-Frames, mounted in their stock OEM location will be permitted. The A-Frames may be reinforced along the edges by welding round stock. Cutting and/or changing lengths of the A-Frames will not be permitted.
F.) The lower rear trailing arms must remain in their stock OEM length and format, from the original OEM application and measurement system (English or Metric) and must remain specific to their particular chassis/frame. The lower rear trailing arms must be mounted in the stock location. Additional holes in the frame will not be permitted.
G.) The upper rear trailing arms may be altered (shortened and/or lengthened) to obtain the correct pinion angle.
H.) Aftermarket bushings will be permitted, but the arm must not be altered in any manner. Slots and/or adjustable rod ends will not be permitted.
I.) Leaf-type springs will be permitted. Only stock OEM-type magnetic steel leaf spring(s) stack(s) will be permitted. Single leaf, mono-type-leaf and/or any type of slider and/or any composite leaf-type applications will not be permitted.
J.) Coil-over applications of any-type will not be permitted.
K.) Aftermarket coil springs will be permitted. The coil spring location may be altered, however, the centerline of the axle tube may not be any further forward than the front of the spring or not further back than the rear of the spring.
L.) Only magnetic steel body, non-adjustable shock absorbers will be permitted.
M.) Weight jacks will be permitted.
N.) Hydraulic ratchet and/or electric weight jacks are not permitted.
O.) Only stock-type OEM brakes will be permitted. All four corners must be in working condition prior to and following the completion of competition. After market brake pedals will be permitted. No Right Front Shut-Off.
P.) Suspension components that are adjustable within driver compartment of any-type will not be permitted.
Q.) Lower rear trailing arm mounts on the rear end may have adjustment holes.
Wheels and Tires
A.) A maximum 8″ (inch) wide steel racing wheel will be permitted. Aluminum and/or magnesium and/or mag-type and/or homemade wheels will not be permitted. one (1) inch magnetic steel lug nuts will be permitted on all four corners of the vehicle.
B.) Only Hoosier E-Mod tires; compounds, D, H and/or A will be permitted.
C.) A bead lock will be permitted on the right rear tire only.
A.) Racing seat is mandatory! Seat must be securely mounted to frame or roll cage.
B.) Head rest (behind the head) should include padding. All areas surrounding the head should have pad- ding.
C.) A right head net or support is required. Head nets must be equipped with quick release mechanisms.
D.) The seat must be mounted a minimum of 30″ (inches) from the center of the rear end, measured at the bottom of the seat.
A.) Ford 9″ Rear End OK.
B.) Floater Rear End OK.
A.) No sharp or protruding edges in or around the driver compartment, which would impede the driver’s rapid exit from the car.
B.) An electrical engine shut off switch is required. The switch must be clearly labeled and within the reach of the driver.
C.) Flame retardant seat, roll bar, knee and steering pads or padding are recommended.
A.) A minimum 4-point competition roll cage is required. The roll cage must be constructed of magnetic steel tubing that is a minimum of 1 1/2″ in diameter, with a minimum tubing thickness of .095 (wall thickness).
WRECKER HOOKS MANDATORY FRONT & REAR:
Both must be accessible. If no wrecker hooks are on the car, the car will be pushed, towed or dragged to the infield until after the racing program is completed.
NEITHER WRECKER CREWS NOR RACE TRACK WILL BE RESPONSIBLE FOR ANY DAMAGE DONE TO THE CAR.