Upcoming Events

7700 N. Broadway   67219

316-755-1781 

$2.00 Discount Tickets Available All Season 

August 2  Economy Motors AAAModified, Credit King Modified, Alternative Pest Management Rookie Modified. Street Stock, Thumper, Hornet, Mod Lite,  7pm

August 7:  USMTS Touring Modified Seires "Hunt For The Casey's Cup"  7pm

August 9:  305 Sprints, Economy Motors AAAModified, Alternative Pest Management Rookie Modified, Street Stock  7pm

August 15:  Wix Filters / Bumper To Bumper Auto Parts Presents: The Harold Leep Memorial USAC Non-Wing Sprint Car Freedom Tour, plus Kansas Antique Racers  7pm

 

                                                      

 

 

 


 

 

 

Mobile Gameden

 


 

81 Speedway
305 Sprints
Modifieds
Mod Lites
Modifieds
Sprint Cars
Street Stocks
Thumpers

Modifieds

 

 

 

MODIFIED RULES 2014  1/25/14

No transmitting or listening devices in car except race receivers which ARE MANDATORY!! No exceptions! ZERO TOLERANCE!! NON WORKING OR LISTENING DQ!!!

Safety

1.  Helmets are required and must be a minimum of SA2005 with certification label inside helmet

2.  Helmets must be worn at all times car is on track

3.  SFI approved flame/fire retardant fire suits, gloves and shoes are mandatory

4.  An approved head/neck restraint system is mandatory (Hans, G-force, Hutchens or SFI rated neck collar

5.  Nomex underwear is highly recommended

6.  Seat belts and shoulder harness cannot be more than three years old

7.  The date of manufacture should remain visible at all times

7.  A lever-type quick release latch must be fastened to the lap belt

8.  All seat belts and shoulder harnesses must connect at the lap belt with a quick-release buckle acceptable to series officials

9.  Only custom manufactured racing aluminium seats acceptable to officials

10.  All seats should have padded rib protectors

11.  All seats are required to have a head rest on the right side

12.  All belts must be a minimum of three (3) inches wide

13.  Belts must be bolted to the roll cage with no less than 3/8inch bolt

14.  A center, crotch belt must be securely mounted to the lower seat frame at the bottom and to the lap seat belt on the top

15.  Where the belts pass through the seat edges, it must have a grommet installed, be rolled, and/or padded to prevent cutting of the belt

16.  Window nets are mandatory

17.  Windshield must have three (3) bars in front of driver.

 Frame

1.  1964 or newer perimeter American rear wheel drive passenger car frame only - no sports car frames

2.  Frame must be full and complete - cannot be widened or narrowed and must be able to support roll cage on both sides - Exception: weight jack in original center line of spring tower allowed

3.  Frame may be cut a maximum of 36” forward from center of rear end housing

4.  Horns may be removed in front of steering box

5.  Front cross member may be notched and boxed for radiator and/or steering clearance

6.  Maximum seven inch wide opening in side of spring tower for spring removal

7.  Maximum two inch wide by four inch tall frame stiffener may be welded directly to outside of left side frame rail

8.  Minimum wheelbase is 108 inches and maximum 112 inches on both sides

9.  Maximum overall width (front or rear) shall not exceed 78 inches from outside of tire to outside of tire

10.  No part of frame can be lower than four inches from ground except front cross member

Roll Cage

1.  Must consist of continuous hoops

2.  Minimum 1.75 inch O.D. tubing with a minimum wall thickness of 0.095 inch for main cage

3.  Frame mounted in at least six places - low carbon or mild steel recommended

4.  Must consist of a configuration of front, rear, and top hoops connected by tubing on sides or side hoops

5.  Driver’s head must not protrude outside cage with helmet on

6.  Roll cage must be securely supported and braced with minimum one cross bar in top halo

7.  Foot protection bar required

8.  Main cage no further forward than rear of engine

9.  All bars forward of cage must be lower than hood

Driver Compartment

1.  Must have minimum three windshield bars in front of driver

2.  Aluminium high back seat only and must be bolted in next to left side frame rail ahead of rear tires

3.  Bottom of seat cannot be lower than bottom of frame rail

4.  Driver must be sealed off from track, driveline, engine, fuel cell, canisters, and pumps

5.  Oil coolers must not protrude above interior

6.  Accumulators cannot be mounted between driver and left side door bars

7.  No driver adjustable devices while car is in competition except brake adjuster

8.  No mirrors or reflective sun visors

Steering & Suspension

1.  All components must be steel, unaltered OEM, in OEM location, and replaceable by OEM parts except tube-type upper A-frames with aluminium/steel cross shaft and mounts can be moved

2.  OEM replacement tubular control arms OK

3.  Lower A-frames must be right and left and of same design: rubber, nylon or steel lower A-frame bushings, no offset or bearing type, welded or bolted shock mount on lower A-frame, ALL PARTS MUST MEET ALL OEM SPECS & MATCH SIDE TO SIDE

4.  Lower A-frame mounts and bolt holes on frame must be in OEM location

5.  All components must be steel, unaltered OEM, in OEM location - except outer tie rod end and adjustment sleeve may be replaced by a minimum 0.625 inch steel rod end and steel tube - spindles can be ground for brake calliper clearance only

6.  Unaltered OEM replacement Pinto spindles, raised cast, spindles must be right and left and of same design

7.  Bolt on spindle savers allowed

8.  Steel steering shafts and knuckles only

9.  Steering quickener, steering wheel, and quick release may be aluminium

10.  Cockpit steering may be modified and must be kept on left side

11.  No rack and pinion

12.  One steel, non-adjustable, unaltered shock per wheel

13.  One additional shock allowed on rear suspension

14.  No threaded body, front coil-over, air, or remote reservoir shocks

15.  No homemade coil-over used anywhere

16.  Steel or composite leaf spring allowed

17.  One coil and/or leaf spring per wheel only.                                                                

18. Progressive spring allowed on pull bar or lift bar only.                                                     

19. Rebound link must be rubber type material (no springs or spring type devices allowed)

20.  Any coil spring minimum 4.5 inches O.D.

21.  No torsion bars or air bags

22.  All components must be steel

23.  No covers allowed

24.  All trailing arms/link bars must be solid tubing

25.  Rear of frame may be altered to accept leaf or coil springs

26.  Steel coil-over eliminators or steel/aluminium coil-over kits allowed

27.  Must conform to shock and spring rules

28.  All suspension parts must be visible on both ends

Rear End

1.  Any approved OEM passenger car type or truck rear end may be used

2.  Floaters & Steel tube quick changes allowed

3.  No aluminium allowed except lowering blocks, axel caps, drive flange, quick change rear end parts and bearing covers.

4.  Rear ends must be locked with a steel mini spool, full steel spool or welded gears

5.  Steel axels only

6.  One piece driving flange only

7.  No torque dividing differentials

8.  No scalloped ring gears

9.  Minimum ten (10”) inch ring gear only on quick changes-aluminium spool ok in quick change only

10.  No titanium or aluminium birdcages

11.  No wide five hubs
Bumpers/Rub Rails

1.  Steel only

2.  Bumpers must be used both front and rear at all times and welded or mounted with bolts

3.  Must be minimum 1.25 inch O.D. tubing

4.  0.065 wall thickness on front

5.  0.095 wall thickness on rear

6.  Two-bar front bumpers must be mounted frame-end to frame-end no wider than width of material outside frame horns and with bottom loop parallel to ground

7.  Top bar must be directly above bottom bar, minimum 6.5 inches apart, measured center to center

8.  Rear bumper/nerf bars cant be wider than tires.

Tires and Wheels

1.  Hoosier 83/8-15 A40 or H-40 or G60

2.  Beadlock right side only

3.  Any 8” steel wheel

4.  No softening or conditioning of tires is allowed

5.  Tire durometer cannot read less than 50pts after race

6.  NO Bleeder Valves

Brakes

1.  Must be steel approved OEM, operative four wheel drum or disc

2.  Must maintain minimum OEM dimensions for hubs/rotors and callipers, cannot be lightened

3.  Bolt pattern may be changed

4.  Larger studs mandatory (5/8)

5.  Rear rotors may be aftermarket, minimum 0.810 inch thickness

6.  Vented rotors only

7.  No scalloped rotors

8.  No brake shut-off or pressure sensitive devices

9.  One proportioning device allowed, front to rear only

10.  Brake lines must be visible

11.  No aluminium or titanium rotors or calipers

12.  Glowing rotors will not be permitted; any car with glowing brakes will be black flagged

 Exhaust

1. Round tube headers only

2. Tri Y headers allowed…BUT NO stainless steel

Fuel System

1.  Racing fuel cell required, maximum 32 gallon capacity, must be in minimum 18 gage steel container

2.  Cell must be securely mounted behind rear axle, between tires, minimum of four inches ahead of bumper, minimum of ten inches above ground

3.  Must mount with minimum two 0.125 inch thick solid steel straps, two inches wide around entire cell

4.  All cell mounts must be steel, securely welded to frame/cage

5.  Protective tubing must cover rear and extend past both sides of cell

6.  No part of cell shall be lower than protective tubing

7.  Fuel cell vents, including cap, must have check valves

8.  Pick-up must be on top or right side of cell

9.  Limit one fuel filter

10.  No cool cans

11.  If fuel cell does not have aircraft style positive seal filler neck/cap system, a flapper, spring or ball type rollover valve is required

Fuel

1.  Gasoline or alcohol

2.  No performance enhancing additives

3.  Upper cylinder lube allowed

4.  Fuel sample may be taken from any car at any time

 Battery/Starter

1.  One battery only

2.  Must be shielded and securely mounted between frame rails

3.  Must have capability of starting without being pushed or pulled

4.  Must leave initial staging area on demand, unaided or go to rear of that race

 Gauges/Electronics

 ALL CARS MUST USE MAX. 8000 RPM REV LIMITER CHIP. THIS MAY BE ACCOMPLISHED USING ONE, NON-ADJUSTABLE, 12 VOLT IGNITION BOX WITH ONE HIGH END REV LIMITER SETTING OR AN INTERNAL SETTING INSIDE BOX. MSD #8728 REV CONTROL OR MSD #8738 ADDITIONAL REV CONTROL BOX ALLOWED. PRESET CRANE #6000-6478 IGNITION BOX ALLOWED. NO ADDITIONAL IGNITION ACCESSORIES ALLOWED. ALL COMPONENTS MUST BE OUT OF REACH OF DRIVER, BUT ACCESSIBLE FOR INSEPECTION. NO MAGNETOS OR CRANK TRIGGERS.                        

1.  No transmitting or listening devices in car except race receivers which ARE MANDATORY!! No exceptions! ZERO TOLERANCE!! NON WORKING OR LISTENING DQ!!!

2.  No electronic monitoring computer devices capable of storing or transmitting information except tachometers allowed on car

3.  No digital tachs allowed

4.  Only one 12volt ignition box allowed; ignition box must be located outside of cockpit in front of driver

5.  No additional ignition accessories allowed

6.  No timing retard controls allowed

7.  No traction control devices

8.  Any car suspected of running a traction control device or unusual handling characteristics can be pulled out of competition and not allowed to race

9.  No bundling of wires, all wires must be open and visible

 Transmission/Drive Shaft

1.  Must have at least one gear forward and one reverse, plus a neutral position

2.  With motor running and car in a still position, driver must be able to engage car in gear and move forward, then backward

3.  Bert, and Brinn transmissions will be allowed as well as any OEM transmission

4.  No five speed transmission, “in or out” boxes, or quick change devices allowed

5.  Functioning shifter must be in stock location on transmissions manufactured after 1995

6.  All manual gear-type transmissions must have a standard OEM case and must have a working disc-type or approved cone-type clutch inside and explosion proof steel bell housing

7.  Automatic transmissions must remain in OEM stock appearing automatic case

8.  Original bell housing must remain

9.  Must have an approved scatter shield or blanket

10.  Scattershield may be constructed of 25-inch by 3-inch steel, 270 degrees around flex plate or flywheel

11.  Steel driveshafts only-must be paint white

12.  Driveshaft must be at least 2”inches in diameter

13.  NO BALL SPLINE

 Engine Compartment

1.  Rear of engine (bell housing flange) must be mounted at least 72 inches forward from centerline of rear axle

2.  Engine offset must be kept within two inches of centerline of front cross member with engine level

3.  Minimum 11 inch engine height from ground to center of crankshaft

4.  Radiator must be mounted in front of engine

5.  Cooling system may be modified

Engine Specifications

1.  Any American make engine allowed

2.  Steel heads and block only

3.  23 degree steel heads only

4.  No dual point distributors

5.  All engines must be able to be used in conventional passenger car without alteration

6.  Engine mounts cannot be remove or altered

7.  Castings and fittings must not be changed

8.  No machine work on outside of engine

9.  “Wet” oiling system only

10.  No titanium, magnesium, or carbon fiber products except for valve retainers

CRATE Engine Specifications

  1. Must use unaltered sealed GM #88958604 crate engine with additional IMCA cable-lok system – NO EXCEPTIONS
  2. Upon inspection any different, altered or missing GM seal bolts or IMCA Cable-loks will result in disqualification, loss of NCRA points.
  3. GM seal bolt exception is IMCA approved and issuedCable-lok repair system
  4. Any crate engine not using required pushrods, valve springs or rocker arms will be penalized.
  5. Spoiler height is 8in.
  6. Weight with driver after race 2350lbs .
  7. Rev chip 6400 max.

Aspiration

1.  One two-barrel or one four-barrel carburetor OK

2.  Must be naturally aspirated

3.  No fuel injection

4.  No electric fuel pumps

 

 

Weight

1.  Minimum weight limit of 2,400lbs - no tolerance - after race with driver

2.  Weights must not be used in driver’s compartment or outside of the body or hood area

3.  Any weights added to other areas of vehicles must be securely mounted and must be painted white with car number on it, and attached with at least two 0.5 inch bolts

4.  No titanium, magnesium, or carbon fiber products except for valve retainers

5.  No gun-drilled, tubular, hollow bolts or studs

6.  Steel fasteners only

 

 

 

 

 

 

 

 

Disclaimer:The rules and/or regulations set forth herein are designed to provide for the orderly conduct of racing events and to establish minimum acceptable requirements for such events. These rules shall govern the condition of all events, and by participating in these events, all participants are deemed to have complied with these rules. NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM PUBLICATIONS OF OR COMPLIANCE WITH THESE RULES or death to a participant, spectator or official. The race director shall be empowered to permit reasonable and appropriate deviation from any of the specifications herein or impose any further restrictions that in his opinion do not alter the minimum acceptable requirements. NO EXPRESSED OR IMPLIED WARRANTY OF SAFETY SHALL RESULT FROM SUCH ALTERATION OF SPECIFICATIONS. Any interpretation or deviation of these rules is left to the discretion of the officials. Their decision is final.

©2013 81 Speedway