2012 RULES
1. Cages/Chassis
a. Fabricated Chassis only
b. Minimum 1 ½” Diameter .095 wall tubing
c. Must be 4-post cage with 3 U-shaped door bars on drivers side
d. Front and rear hoops required- Under slung Chassis OK
e. Rear bumpers must extend past tips of spoiler, in order to be pushed from race track by tow truck.
f. Must have access through rear deck for lifting point on frame, if bumper not strong enough to lift car.
g. Double front bumper, (1) up right support allowed, lower bar to be parallel with frame, .065
2. Weight Specifications
a. 2000 cc or less, must weigh 1800 lbs or more
b. 2300 cc must weigh min 1900 lbs
c. Left side weight must not exceed 58% of cars total weight, NO exceptions
d. All weight added to car in the form of lead blocks must be painted white with car # securely mounted to or within frame rails, with 1/2 " bolt or larger
e. Cars maybe scaled at anytime
f. Weight infractions must be addressed prior to entering race track , at tech's discretion
3. Bodies: (must resemble a full size modified)
a. Windshield can be Lexan, mesh screen or 3- 3/8 minimum vertical bars
b. Full windshield OK- rear windows permitted
- All dimensions must be within tolerance, No exceptions
MAX MIN
A. 102" 94"
B. 64" Maximum track width - center to center
C. -- 2 1/2" Minimum ground clearance (ride Height) Measured at foot box w/ driver.
D. 18" 12"
E. 36" 30"
F. 8" + / - 1/2" Maximum blade (spoiler) height side panels not to extend above spoiler, 22" side max side panels in length
G. 8" 7" Full rear panel attached solid, 90 degrees from deck.NO AIR SPACE, NO INSET PANELS
H. 20" 15"
I. 61" 53"
J. 50" 42"
K. 56" 41"
L. 42" 24"
M. 74" ----
N. 25" 21"
O. 112" 96"
P. 46" 41"
Q. 34" 26"
* 4" interior rake from fire wall to spoiler, Interior deck must attach to top of doors and rear quarters and be flat from left to right.
* 2" max roof rake in 24" measured at center of roof
* Must have hoop protecting fuel cell
* Must have side and rear nerf bar's min 1" .095 to avoid wheel hop and extend past outside of tire.
* Running roofless car must have bar over drivers head with adequate helmet
clearance
4. Engine
a. Any 4-cylinder, single overhead cam engine
1. Maximum .040 Overbore
2. 2300 c.c MAX Long Rods OK-No Strokers
3. 2 valves per cylinder and No aluminum heads, race engine steal head allowed
b. 12” maximum engine set back +/- ½”measured from center of lower ball Joint to #1 spark plug
c. No dry sump oiling systems
5. Exhaust
a. Must exit car away from the driver and six inches behind drivers seat.
b. Must meet 90 DBA at 100 feet or track specifications. (Roseville 90 DBA at flag stand)
6. Carburetors and Ignition Systems
a. Holly 2BBL 500 or 350 CFM Only or comparable, "GO" "NO GO" gauge will be used, No removable venturi , Two (2) return springs mandatory must be mounted separately.
b. Any intake is allowed
c. Battery must be securely mounted outside of the drivers compartment, must have master kill switch within reach of the driver
d. Ignition/point or MSD NO crank Trigger
7. Cooling System
a. Radiator must be mounted in front of the engine
b. 1 Qt. Overflow required
c. NO Antifreeze, water wetter ok, and recommended
8. Drive Train
a. 8” or 9” Rear ends- Mini Spools, Floaters, Quick Changes OK, 9” quick change.
b. Any stock production transmission , No racing transmissions
c. Steel drivelines- Aluminum OK, must be painted white and have at least one hoop of steel strap,
6" from front U-joint max
d. Any clutch or fly wheel is permitted –No Couplers or Buttons
e. Scatter shields highly recommended
f. No electronic traction enhancing devices
9. Suspension
a. Any Stock or aftermarket components
b. Shocks- NO Canister types, No shocks with adjustments from the driver's compartment
c. No spring rods
10.Brakes and Steering
a. All four wheels must have functioning brake if running locker or DPI
b. Any stock or aftermarket Rack and Pinion OK- recommend steering shaft locks
c. May run single rear brake if running spool
11.Wheels and Tires
a. Any racing wheel- - 13 X 8” wheels MAX
b American Racer Tire 22.5/8.0-13S ( tires must be purchased thru promoter or sponsor)
c. No Tire softener- Min. Durometer 62 COLD. 70˚ F or below
12.Fuel and Fuel System
a. Fuel cell must be of 20 gauge steel with Polyethylene inner shell. Must have fuel cell guard below
cell
b. Fuel cell must be securely mounted behind the rear end and adequately protected from an impact.
c. Must have vent and a tip over valve
d. Murphy switch required with electronic fuel pump, must be functional
e. Fuel cap must be legibly marked with the cars number and tethered to fuel cell
f. Max. 110 Octane Fuel- NO Additives. Race gas only, No alcohol
13.Safety
a. Aluminum, high back seats must be mounted with minimum four (4) 3/8” bolts with flat washers;
2 in bottom and 2 in back of seat (head, shoulder, rib and leg supports are recommended)
b. 3” 5- point harnesses required- Installed per manufactures instructions. Where belts pass through the seat or any metal, they must be protected from being cut. Belts can not be more than 5 years old, cannot be frayed or torn and must be labeled with SFI factory tag and dated
c. SFI rated fire suit, shoes and gloves required, must be clean and in good condition- fire proof underwear, socks recommended, no rips or holes
d. Snell 2013/2010 required or better helmet,Full face shield recommended Goggles required with open face helmets (NO MOTOCYCLE HELMETS!!!!!)
e. Neck collars and other safety harnesses such as, a head and neck restraint system highly recommended, under 18 of age, required
f. Full window net required on driver’s side including roadsters. Roadsters right side net is recommended. Must not be more then 5 years of age and must be securely fastened and operational per manufactures instructions. No plastic fasteners or pop rivets allowed
g. If running a car without a roof, arm restraints are Mandatory and must be worn properly, hands must not reach outside the roll cage
h. 2 ½ lb min. fire bottle securely mounted within the drivers reach required, no zip ties. Fire suppression system recommended
i. Driver’s compartment must be completely sealed from the track and engine and must be fireproof. Shifter boot and crush panels are required. Roll bar padding required within drivers reach.
j. A mirror, either a rear view or one mounted to the side is recommended and may be made mandatory for any one driver or the entire field at the Promoters’ and Officials discretion.
k. In 2012 race receivers will be mandatory. No radio or any other communication to the driver will be allowed, including wireless devices.
14. Cars may be scaled at any time. Main Event calculations will be made @7lbs per gal. with max of 2.5 gal used. Weight infraction will result in disqualifications
15. All safety infractions must be addressed and properly fixed before car is allowed to touch the racing surface- NO exceptions
16. All performance enhancing infractions must be fixed or the car will race for no points or winnings
17. Age Requirement; 16 years or older
Any discretion in the interpretation of a rule may be brought to the attention of Pro-4 Promoter and Officials. Any difference can be discussed. Promoter and Officials reserve the right to either adjust their initial interpretation or uphold the original decision.
COMPETITION ETIQUETTE
1. No Reckless Driving - Intentionally driving in a way to cause damage to another competitors
car or driving beyond your and /or your cars abilities.
2. No Blocking
A. Failure to pass a slower car in a timely manner that results in holding up the rest of the field. This rule applies to staying next to a slower car when you are capable of passing, It does not apply to side by side racing between evenly matched cars.
B. Driving tactics that prohibits a faster car from passing
I. Failure to lift the throttle when your car has a push
II. Failure to give a challenging car racing room
III. Not holding your line when you are being lapped
3. No Aggressive Contact - These are open wheel race cars, treat them as such. Intentional contact beyond that which is competitive racing will not be tolerated.
Failure to adhere will result in the following:
1st Offence - Written letter, placed on probation
2nd Offence - Disqualifications from the race, a loss of all points and money
3rd Will be asked to resign from the racing division
* If a wreck is a result of this type of driving, the above mentioned actions will be taken
plus you will be docked 25 points and/or fined. If you cause a second wreck at any point in the same season you will be suspended for 5 races or the remainder the season, which ever is
greater.
TRACK ETIQUETTE
1. Pit meetings are mandatory, failure to attend will result in starting at the rear of all the nights events.
2. Absolutely NO FIGHTING, (which includes detrimental threats made towards a fellow race member or their crew) will be tolerated at the race track
3. No speeding in the pits. There will be a $100 fine imposed for anyone driving fast and/or
reckless in the pit area. This will double with the 2nd offense. In the event which there is a third offense the fine will increase to $500 and a one race suspension.
4. The Pro-4"s are a traveling series, therefore you will also abide by the rules imposed by
those facilities in regards to conduct and on track officiating.
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HUMBOLDT LIMITED PRO-4 MODIFIEDS RULES
THIS CLASS IS DESIGNED TO GIVE A RACER THAT ENJOYS 4 CYL RACE CARS A CAR THEY CAN LEARN TO MAKE CHASSIS ADUSTMENTS AND PROGRESS IN THE SPORT.
CHASSIS - BODIES
1. Factory Stock or Fabricated
2. Minimum .095 1 1/2" OD Tubing
3. 4 Point with Front and rear hoop 3 door bars drivers side 2 bars on passenger side
4. Must Resemble IMCA Modifieds See Drawing - Roadsters ok (arm restraints required)
5. Front and Rear bumpers & side nerfs required 1" Min. 1 1/2" Max
6. Minimum Weight ---------- 2100 or less 1650
2100 to 2350 1750
7. Weight maybe added for suspension improvements
Coilover Springs & Shocks front or rear 50lbs added
Afte rmarket Rack and Pinion 25lbs added
After market Sway Bar 25lbs added
After market Lower Control Arms 25lbs added
8. Weight Break for Stock Roller Head 50lbs added
9. Adjustable Sway Bar OK
10. Shock Ends may be changed
11. Shocks must be stock replacement KYB OK
ENGINES
1. Any 4 cyl 2 valve per cyl.
2. 2300 c.c. .060 Max Over Bore
3. Long Rod OK - After market Rods OK
4. No After market heads
5. Port & Polish of Heads OK
6. 500 Holly Stock Bore from factory or webber 38 m.m
7. Any Intake 2" tall Max Adaptor
COOLING SYSTEM
1. Radiator in front of Engine
2. 1 Quart Over Flow Required
3. No Anti-Freeze
STEERING & BRAKES
1. Stock Rack & Pinion Only
2. Aftermarket Pedals & Master Cyls. OK
DRIVE TRAIN
1. Any stock transmission
2. Any Stock rear end
3. Mini Spools OK
4. After market Clutches and Flywheels OK
5. Scatter Shields Recommended
6. Steel Drive Shafts only painted white
SUSPENSION
1. Stock Suspension Only
Coil Springs in front spring adjusters OK
Rear Leaf Springs Sliders and Lowering blocks OK
Adjustable shackles permitted
2. No Coil over Shocks $50.00 Max (Must show receipt)
WHEELS & TIRES
1. Any Steel Wheel up to 8" Bead width
2. Goodyear 23x7 13 or short 22x7
3. American Racer 22.5x8.0 - 135 slicks take offs
4. American Racer 23.5 Treaded Tire and Short
5. No Softener Min. Durometer 62 cold
FUEL & FUEL SYSTEM
1. Race Gas OK
2. Fuel Cells required
3. Murphy Switch required wirh electric fuel pump
SAFETY REQUIREMENTS
1. High Back Alum. racing seats securely fastened
2. 3" 5 way racing belts datd within 4 years
3. SFI Rated Clean Fire Suit. ( Gloves and Shoes recommended)
4. 2 1/2 #Fire Extinguisher on board within drivers reach
5. Drivers compartment must be sealed from track and engine
6. Mirrors are Optional
**CARS NOT MEETING ANY SAFETY RULE WILL NOT RACE**
ALL RULES FROM TRACKS WHERE WE MAY RACE WILL BE INFORCED BY LOCAL
TRACK OFFICIALS OFFICIALS DECISIONS ARE FINAL
CARS MAY BE WEIGHED OR TECH INSPECTED AT ANY TIME
ABOVE ALL, RACE YOUR FELLOW RACER AS YOU WOULD LIKE TO BE RACED. THESE
ARE OUR TOYS, REMEMBER TO SHOW RESPECT FOR ALL THE TOYS..HAVE FUN
IF IT DOESN'T SAY YOU CAN, THEN YOU CAN'T !
