This class is intended to be an entry level racing class. Any component not listed in these rules must be completely stock.
Any and all modifications must be approved by Track Officials. Rules may be amended at any time during the season, in the interest of fair competition.
1 General
A. Two-way radios are permitted.
B. RACEceivers are mandatory for communication between competitors and track officials.
C. Minimum age for Pure-4 is 14.
D. The top 10 cars in qualifying will be subject to inversion by pill draw or roll of dice each week.
Previous week winner will start in 11th place.
E. All cars need to have a chain or tow hook to be able to lift the car.
2 Competing Models
A. 1972 to present four-cylinder passenger cars (sedan type) or trucks are permitted.
Must have been manufactured with front and rear seats – two-seaters are not permitted.
B. Mid-engine, rotary engine, and/or turbos are not permitted.
C. Four wheel drives are not permitted.
D. Four wheel steering or rear steering is not permitted.
E. Automatic or manual transmissions are permitted.
3 Weight
A. Base weight is 2310 lbs. for engines up to 110 horsepower (HP). Cars over 110 HP will be required to add weight using the weight formula. Weight formula: After 110 HP, 11 lbs. will be multiplied for each HP over and added to the base weight to determine final weight. (Ex. 125 HP will be (125 HP - 110 HP) = 15 * 11 = 2475 lbs.)
B. Right side weight must be 45% of total weight.
C. Horsepower and weight must be on windshield in 3" letters. Provide proof of claimed horsepower.
D. Track Officials ruling on all horsepower ratings will be final.
E. All added weight must be securely fastened to car with at least 2 ½ inch grade eight (8) bolts. All weight must be painted white with the car number on weight. Any car or truck losing weight will be subject to fine or penalty.
F. Weight may be adjusted in fairness to competition.
G. Fuel burn-off – one (1) pound per lap.
4 Engine
A. Only stock four-cylinder engines are permitted. Must remain stock for make of car or truck.
B. Engine block and cylinder head must match as manufactured.
C. 160 maximum horsepower (HP).
D. NO porting or cutting of any type on any engine parts.
E. Boring of engine block will be permitted.
5 Fuel System
A. Fuel injection or carburetor fuel system is permitted. Must be as manufactured.
High performance carburetors or injectors are not permitted. Carburetor must be stock for vehicle with no modifications.
B. Fuel injected engines must have fuel pump safety cut off switch.
C. The use of a turbo is not permitted.
6 Exhaust Systems
A. No aftermarket headers. Header permitted must be stock for car.
B. No performance enhancing exhaust permitted.
C. Exhaust pipe must remain stock size and must exit behind driver.
7 Transmission
A. Transmission must be stock for vehicle. MUST run stock clutch.
B. High performance parts are not permitted.
8 Air Cleaner
Aftermarket air cleaner will be permitted.
9 Bodies
A. Body must remain stock.
B. Aftermarket noses may be used. Must be similar in appearance to stock parts.
C. All glass must be removed. A full Lexan windshield is required.
D. All exterior lights must be removed with exception of third brake light (optional).
E. Stock or fabricated dash is permitted.
F. Rear spoiler maximum of five (5) inches is permitted. Spoiler must not be wider than deck lid.
G. Inner fenders may be removed.
H. Fenders may not be cut for tire clearance.
I. Firewalls and trunk area must remain stock.
J. Aftermarket hood is permitted – must be securely fastened.
K. Inner doors, hood, and trunk lid may be cut out
10 Safety
A. Roll cage – Minimum four (4) point cage constructed of 1 ¾, .095 tubing.
B. Roll cage should have two (2) down bars from the top of cage through rear firewall to rear of car.
C. Roll cage should have four (4) door bars on left side with door plate of minimum 1/16 inch thick steel.
D. Right side should have at least three (3) door bars or an X bar.
E. Any car with 1 ½ inch roll cage should have 1/8 inch door plate and ‘Petty bar’.
F. Two (2) support bars may extend through front firewall and to the radiator.
G. Racing seat must be an approved seat and should be properly mounted to seat frame.
Seat should not be attached to the floor pan.
H. A five (5) point racing harness should be used. Must be within three (3) years of date of manufacturer.
I. All cars should have a working fire extinguisher.
J. Fuel cell may be used. Must be securely mounted centered in trunk area.
K. No fuel line in driver’s compartment.
L. Quick release steering wheel coupler should be used.
M. A window net must be used. Window net must release at the top.
11 Suspension / Wheelbase
A. Suspension must be stock
B. Springs may be cut or heated.
C. Spring rubbers are permitted – maximum of two (2) per spring.
D. Ride height will be four (4) inch minimum measured at lowest point on each side of car.
E. Wheelbase must be stock for car and must match side to side. ½ inch difference is allowed.
12 Rear End
A. Locked differentials are not permitted.
B. Positive-traction differentials are not permitted.
C. Camber is optional.
13 Tires
A. Legend approved tires or 380 tread wear rated tires only. All four (4) tires must be same size – 60 series.
B. Wheels may be stock or seven (7) inch racing wheel. All four (4) wheels must be the same offset
14 Electrical
A. Battery – Must be enclosed in sealed box securely mounted to the floor pan.
B. Modifying or altering – in any way – of the car’s computer is not permitted.
*Anything not listed in the above rules must remain stock. No exceptions.
NO ANTIFREEZE! If your car is found to have antifreeze, you will be subject to a $100.00 FINE
Any and all modifications must be approved by Track Officials. Rules may be amended at any time during the season, in the interest of fair competition.
1 General
A. Two-way radios are permitted.
B. RACEceivers are mandatory for communication between competitors and track officials.
C. Minimum age for Pure-4 is 14.
D. The top 10 cars in qualifying will be subject to inversion by pill draw or roll of dice each week.
Previous week winner will start in 11th place.
E. All cars need to have a chain or tow hook to be able to lift the car.
2 Competing Models
A. 1972 to present four-cylinder passenger cars (sedan type) or trucks are permitted.
Must have been manufactured with front and rear seats – two-seaters are not permitted.
B. Mid-engine, rotary engine, and/or turbos are not permitted.
C. Four wheel drives are not permitted.
D. Four wheel steering or rear steering is not permitted.
E. Automatic or manual transmissions are permitted.
3 Weight
A. Base weight is 2310 lbs. for engines up to 110 horsepower (HP). Cars over 110 HP will be required to add weight using the weight formula. Weight formula: After 110 HP, 11 lbs. will be multiplied for each HP over and added to the base weight to determine final weight. (Ex. 125 HP will be (125 HP - 110 HP) = 15 * 11 = 2475 lbs.)
B. Right side weight must be 45% of total weight.
C. Horsepower and weight must be on windshield in 3" letters. Provide proof of claimed horsepower.
D. Track Officials ruling on all horsepower ratings will be final.
E. All added weight must be securely fastened to car with at least 2 ½ inch grade eight (8) bolts. All weight must be painted white with the car number on weight. Any car or truck losing weight will be subject to fine or penalty.
F. Weight may be adjusted in fairness to competition.
G. Fuel burn-off – one (1) pound per lap.
4 Engine
A. Only stock four-cylinder engines are permitted. Must remain stock for make of car or truck.
B. Engine block and cylinder head must match as manufactured.
C. 160 maximum horsepower (HP).
D. NO porting or cutting of any type on any engine parts.
E. Boring of engine block will be permitted.
5 Fuel System
A. Fuel injection or carburetor fuel system is permitted. Must be as manufactured.
High performance carburetors or injectors are not permitted. Carburetor must be stock for vehicle with no modifications.
B. Fuel injected engines must have fuel pump safety cut off switch.
C. The use of a turbo is not permitted.
6 Exhaust Systems
A. No aftermarket headers. Header permitted must be stock for car.
B. No performance enhancing exhaust permitted.
C. Exhaust pipe must remain stock size and must exit behind driver.
7 Transmission
A. Transmission must be stock for vehicle. MUST run stock clutch.
B. High performance parts are not permitted.
8 Air Cleaner
Aftermarket air cleaner will be permitted.
9 Bodies
A. Body must remain stock.
B. Aftermarket noses may be used. Must be similar in appearance to stock parts.
C. All glass must be removed. A full Lexan windshield is required.
D. All exterior lights must be removed with exception of third brake light (optional).
E. Stock or fabricated dash is permitted.
F. Rear spoiler maximum of five (5) inches is permitted. Spoiler must not be wider than deck lid.
G. Inner fenders may be removed.
H. Fenders may not be cut for tire clearance.
I. Firewalls and trunk area must remain stock.
J. Aftermarket hood is permitted – must be securely fastened.
K. Inner doors, hood, and trunk lid may be cut out
10 Safety
A. Roll cage – Minimum four (4) point cage constructed of 1 ¾, .095 tubing.
B. Roll cage should have two (2) down bars from the top of cage through rear firewall to rear of car.
C. Roll cage should have four (4) door bars on left side with door plate of minimum 1/16 inch thick steel.
D. Right side should have at least three (3) door bars or an X bar.
E. Any car with 1 ½ inch roll cage should have 1/8 inch door plate and ‘Petty bar’.
F. Two (2) support bars may extend through front firewall and to the radiator.
G. Racing seat must be an approved seat and should be properly mounted to seat frame.
Seat should not be attached to the floor pan.
H. A five (5) point racing harness should be used. Must be within three (3) years of date of manufacturer.
I. All cars should have a working fire extinguisher.
J. Fuel cell may be used. Must be securely mounted centered in trunk area.
K. No fuel line in driver’s compartment.
L. Quick release steering wheel coupler should be used.
M. A window net must be used. Window net must release at the top.
11 Suspension / Wheelbase
A. Suspension must be stock
B. Springs may be cut or heated.
C. Spring rubbers are permitted – maximum of two (2) per spring.
D. Ride height will be four (4) inch minimum measured at lowest point on each side of car.
E. Wheelbase must be stock for car and must match side to side. ½ inch difference is allowed.
12 Rear End
A. Locked differentials are not permitted.
B. Positive-traction differentials are not permitted.
C. Camber is optional.
13 Tires
A. Legend approved tires or 380 tread wear rated tires only. All four (4) tires must be same size – 60 series.
B. Wheels may be stock or seven (7) inch racing wheel. All four (4) wheels must be the same offset
14 Electrical
A. Battery – Must be enclosed in sealed box securely mounted to the floor pan.
B. Modifying or altering – in any way – of the car’s computer is not permitted.
*Anything not listed in the above rules must remain stock. No exceptions.
NO ANTIFREEZE! If your car is found to have antifreeze, you will be subject to a $100.00 FINE