Mini-cup

2022 MINI CUP

Auburndale Mini Cup Rules

Central Florida Mini Cup Rules at Auburndale Speedway is a driver development class. This class is committed to helping young drivers develop a solid foundation for their racing careers.
This series allows anyone under 18 years of age to compete in point series. Drivers 18 and over can apply to run as a non-competitive driver. Drivers are required to demonstrate exemplary leadership and sportsmanship qualities, both on-and-off track.
All drivers new to Mini Cup racing at Auburndale Speedway are required to contact Steve Smith 863-559-9865 prior to participation in their first race. No exceptions will be permitted.
Any Mini Cup driver who has not previously competed at Auburndale Speedway must be cleared by the track’s race director prior to their first race. It is the responsibility of all new Mini Cup drivers to report to the race director personally (no crew members), prior to their first race.
All drivers will be required to demonstrate consistency, predictability and comparative lap times to the satisfaction of the race director. Any driver unable to demonstrate these skills will be required to start at the rear of the field (including re-starts). The race director may also require additional driver training before a new competitor is cleared for competition. All novice drivers (as determined by the race director) are required to mark the rear bumper of their car with a yellow stripe of two (2) inches black stripe for yellow bumpers.

Driver and Team Conduct

Conduct

Each participant shall conduct himself to the highest standards of behavior and sportsmanship. Participant actions shall not diminish the reputation of the Auburndale Speedway, sponsors, or the sport of automobile racing. Failure to comply may result in penalties as specified by Auburndale Speedway officials.

Assumption of Risk

Automobile racing is a dangerous sport that can result in serious injury or death. Participation in all aspects of the sport are strictly voluntary. The ultimate responsibility for safety lies with the participants, whether vehicle owner, driver, or crew members. All participants must acknowledge they may suffer bodily injury or death, or loss or damage to property. All participants must further acknowledge that they voluntarily assumed the risk of bodily injury, or loss or damage to property and waive any claims for bodily injury or death, or loss or damage to property against Auburndale Speedway, its parent companies, directors, officers, employees, agents, event officials, sponsors, racetrack, and other participants; discharges such persons and entities from responsibility for such losses; and covenants not to sue such persons and entities for bodily injury or death, or loss or damage to property.

Victory Lane / Post Race

In the interest of promoting young drivers, victory lane will be reserved for the top three competitors under 18, regardless of the overall finish. All drivers over 18 must proceed to their pit stall upon race completion.

Payout / Trophies

Auburndale Speedway will provide payout based on the overall finish. Trophies will be awarded to drivers 18 and under only.

Mini Cup Racing Safety Equipment

Regardless of equipment, or approval in a prior inspection, compliance with all safety rules is mandatory for all cars, and inspection can be repeated at any time without prior notification. No expressed or implied warranty of safety shall result from the technical inspection or approval.

Radios & Race Receiver

Two-way radios are required for drivers 18 and under when taking the track. Capable spotters are to assist the drivers in staging for starts and restarts as well as flags and track conditions and accidents. Race receivers are also required to be used either by the spotter and/or driver

Seat

All cars must be fitted with an aluminum racing seat that fits the driver’s physical characteristics. No homemade seats will be permitted. All seats must be securely mounted in the center line of the vehicle, so the seat center line is within 1/4 inches of the car centerline (the seat cannot be offset). Seats must be mounted using grade 8 hardware.

Safety Harness

All belts and harnesses must be of the five (5)-point type and meet the following minimum requirements:
Have a minimum SFI rating of 16.1.
Be at least two (2) inches wide. (three inches wide recommended).
Be dated by the manufacturer and no more the (3) years old. A quick-release seat lap belt is required.
Both ends of the lap belt must be fastened to the roll cage with grade 8 bolts not less than 3/8 inch in diameter.
Shoulder harnesses must come from behind the driver’s seat. Inertia reels cannot be used.

Head and Neck Restraint

A head and neck restraint system designed specifically for auto racing (neck collar minimum) is mandatory for all drivers.
No driver shall compete in any event with head or arm extended outside of the car
opening.
The top of the driver’s helmet must be at least one (1) inch below the top edge of the roll cage. This will be measured with the driver securely buckled in the seat.
All drivers must wear a racing type helmet with a Snell rating of SA2000 or newer. No bicycle or motorcycle helmets are permitted. Drivers must also check local track regulations to ensure their helmet meets Auburndale Speedway regulations.
All drivers must wear an approved driving suit, shoes and gloves. A single layer fire suit is the minimum permitted.
A standard fire extinguisher mounted in driver’s compartment is mandatory and must be easily accessible to the driver. It is highly recommended that a built-in in fire extinguishing system, a minimum of the cold fire system type or equivalent is used.

ENGINE RULES

If any race car consistently double laps the filled in any 2 consecutive races the race car will be sent to tech prior to the next race to add weight, change gear and/or whatever may be decided to maintain a level playing field by the minim cup committee to maintain a level playing field not to intimidate other racers.

Spec sealed motor or Open Modified Motor

GENERAL ENGINE REQUIREMENTS

ENGINE PLATFORMS PERMITTED WILL BE HONDA GX390 OR CLONE. SEALED OR MODIFIED SEE DIFFERENT REQUIREMENTS FOR EACH

Recommends the use of VP approved sealed engines. CFMC approved sealed engines are not required but will save you time and money by reducing tear downs if your vehicle is sent to tech. The exclusive source for CFMC sealed Mini cup engines is:

VP Racing Engines Phone: 352-262-4901

Web: vpracingengines@gmail.com

Approved sealed engines have numbered seals. Serial numbers cannot be removed from engine block.
Engine must remain in stock location. Offsetting of engine is expressly prohibited.
No interchanging of parts from different engine models except that using U1 crankshaft and rods in a K1 motor are allowed. This includes the GX390 QAE also. The new Honda piston and rings introduced in 2009 must be used in older engines as well.
Engines cannot be altered from stock factory Honda specifications unless otherwise noted in this rulebook.
All parts must be factory Honda parts designed for the GX390U1 and will be checked against Factory Honda parts unless otherwise noted in this rulebook. All official decisions are final.
Specifications for the Honda GX390U1 engines can be found on page 2-4 of the Honda Shop Manual, DETAILED ENGINE REQUIREMENTS
Internal and external governor system may be removed. Governor shaft hole may be plugged or vented.
Zero piston pop-up is allowed. Bore may be clearance and may not exceed the maximum service limits. Bore may be oversized by 10 thousandths (.010), 20 thousandths (.020), or 30 thousandths (.030) with Honda replacement pistons only. Top piston ring may be oversized. Stock or aftermarket ring permitted. Top ring gap is a non-tech item. No gapless rings. No tech on rings except for thickness and width.
Crankshaft may be shortened by a maximum of 1.250 inches at the clutch end. Clutch bolt hole may be retapped. No lightening, polishing, or balancing of the crankshaft is allowed. Crankshaft may be ground .010 and the use of a .010 Honda replacement rod is permissible.
Piston and connecting rod must remain stock standard size, no grinding, polishing, or sizing modifications allowed, although modifying oil lubrication hole is allowed. Also, top of piston crown may be machined to ensure 0 piston pop out. Dish in top of piston must remain a minimum of .080. Use of aftermarket billet rod permissible as long as it meets standard length 4.410 and is unaltered from manufacture.
Rotating the piston or rod is expressly forbidden.
Any replacement rod bolt is allowed, as long as the rod is not altered or modified, except for oil lubrication hole as specified in rule 14.10 above.
New 2009 design Honda piston and rings are legal in all engines. The part numbers for the standard size pistons are 13101-Z5T-000 and for the rings are 13010-Z5R-004. Standard size as well as 10, 20, and 30 thousandths oversize are legal.

CYLINDER HEAD

Cylinder head must remain stock. Cylinder head may be machined to a minimum thickness of 3.730 inches
No porting, polishing or sizing of any part of the cylinder head is allowed. New Honda heads with the casting Z1C-ATA-1 have their ports ground from the factory. This grinding ONLY will be considered legal because it is from the factory. No additional grinding will be allowed, and it will be up to the official’s discretion to determine if a head has been ground beyond the usual seen from the factory. Only the above new style small port small valve head is legal.
Only stock valve grinding angles allowed. 30° first & 45° second
All cylinder head dimensions will be taken from stock Honda parts.
Worn valve guides may be replaced with stock Honda valve guides or with a bronze guide-liner and must remain in stock location.

CAMSHAFT

NOTE: Super Mini Cup engines must compete using the profiled camshaft as described below which has not changed in 10 years. This is the only camshaft profile allowed for 2011.

Camshaft timing cannot be changed from Honda factory specifications. (See Honda Manual)
A reground Honda style camshaft must be used meeting the following profile and must be checked at the lifter against the camshaft. Specifications are listed below. If a cam does not meet the profile below and MMRA officials determine that the only reason is excessive wear on a formerly legal cam, the cam will pass tech for that race only and the driver will be instructed to have a new cam installed for the next event. After market cam blanks legal as to reducing the cost w/o performance gains.

INTAKE

EXHAUST LIFT

34 DEGREES

37-31

19-13 2BBDC 21-27 MAX 68-62 46-40 29-23 12 – 6

-23 ABDC -40 ABDC

POSITION

BBDC

BBDC -4 ABDC ABDC

BTDC BTDC BTDC BTDC

VALVE TRAIN

LIFT

.050 .100 .150 .200 .250 .265 .250 .200 .150 .100 .050

.050

.100 .150

.200 .245 .200 .150 .100 .050

DEGREES

3BTDC – 3 14
30
50

POSITION

ATDC -20 ATDC -36 ATDC -56 ATDC -87 ATDC

MAX
-42 BBDC -13 BBDC

48
19
1 -7 ABDC

All valves, lifters, push rods and rocker arms must remain stock Honda GX390U1 engines
Aftermarket valve springs okay if they meet the dimensions of the stock spring. One stock
Honda shim allowed under both intake and exhaust springs. All dimensions will be taken from known stock Honda GX390K1/U1 engine parts. All other specifications will be from Honda GX390U1 shop manual.
A small groove may be cut in the valve stem for a safety (rubber) “O” ring to be installed.
Groove must be no more than: 0.020″ deep – 0.100″ wide – 0.750″ from end of valve stem.
Slot in rocker arm may be elongated to prevent binding.
A stock Honda valve seal may be used on intake valve only.

HONDA CARBURETOR

Choke may be removed from carburetor. Shaft holes must be plugged.
Any stock Honda jet may be used. Jet may be drilled.
When using the Honda carburetor needle and seat must remain stock Honda GX390U1.
Stock Honda throttle stop must remain stock, unaltered – although aftermarket throttle linkages may be attached to the top for throttle actuation only.
The following modifications are the only allowed changes to the stock GX390 HONDA CARBURETOR:

Throttle Shaft and dimensions shown above.

Jet size is open.
No modification of shaft or butterfly allowed. Must be stock shaft.
No grinding or polishing.
A pickup hole can be drilled parallel to the existing hole of the same size.
Hole can be drilled in bottom of carbnut for remote

Adjustment. Adjustable jet permitted.

May remove tab on low idle mix pilot screw
Shaft size minimum .268
Shaft size between screws minimum of .145
Throttle plate minimum .036
No-go bore gauge .930
Gasket must remain stock Honda GX390U1. L. Carburetor insulator for Honda carburetor must be drilled for pulse pump. Fuel pump must be pulsed from insulator only. Only one hole is allowed. No air leaks. M. No grinding, polishing or sizing of insulators or adapters is allowed.

N. Emulsion Tube must remain stock unaltered length of
1.185 plus or minus .005
O. Emulsion Tube inner diameter of .100 and outer diameter of .156 must remain stock unaltered
P. Emulsion Tube pickup holes may be altered – no tech
on number or diameter of holes
Q. Pilot Jet Holes – must have stock 4 holes but no tech on diameter of holes
NOTE: ONLY THE MODIFICATIONS MENTIONED ABOVE ARE ALLOWED. ANY ATTEMPT TO CIRCUMVENT THE RULES WILL BE CAUSE FOR DISQUALIFICATION AND/OR LOSS OF POINTS.
CARBURETOR GASOLINE FILTER

Gasoline filters may be used. The location and size of the filter must be acceptable to official(s).

AIR FILTER AND ADAPTER

All engines are required to have an air filter and carburetor adapter.
Air filter must 62mm clamp on air filter or K & N part # RU2780 and must remain unaltered.
Air filter adapter may be any billet air filter adaptor or equivalent for Honda and must remain unaltered.
Air filter cannot act as a ram air device.
ENGINE/CAR ELECTRICAL SYSTEM ALTERNATOR
Oil alert system may be removed.
Charging system may be removed.
Charging magnets may be removed.

FLYWHEEL

Flywheel may be balanced. Minimum flywheel weight must be 11 lbs. 10 oz. Weight must be removed from the outer edge of the flywheel.
Any flywheel that shows signs of machining on the inside area will be deemed illegal. The tech official will have sole discretion and authority on this matter.
No other alterations to the flywheel allowed.

SPARK PLUG

Any make or brand of spark plug may be used. Plug must remain unaltered from factory but sealing ring
may be removed for head temperature sensor.
Aftermarket spark plug connectors may be used to replace stock Honda connectors.

IGNITION SYSTEM

Altering the ignition timing from stock Honda GX390U1 specifications is not allowed. No alterations to the starter coil or other electrical parts are allowed.
Spark intensifiers are prohibited.

STARTER

The electric self-starter must be in working order. All cars must be capable of starting under their own
power.
The starter cup is an extension of the recoil starter assembly and can be removed if desired.
It also presents a hazard when adjusting the carburetor. The cup may be removed and replaced with the following Honda fan flange (Honda part # 19512-ZE2-000) ONLY. The Screen must be replaced and firmly attached to the motor in the original location and made of 1/4 inch mesh. Honda part # 19620-ZE3-810 may be used. It cannot be made of solid materials or be partially covered. A hole may be cut in the center of the mesh to allow access to the crankshaft nut. Any aftermarket starter will be permitted.

BATTERY

Battery must be located in stock location. All batteries subject to approval by official(s).

ELECTRICAL SWITCH LOCATIONS

All electrical switches must be located on the left side of the dash panel and must be labeled showing the on/off positions.
A switch must be wired so as to ground the ignition.
A working gravity type shut off switch is mandatory on cars with electric fuel pumps.

ACCESSORIES

Lap timers and other automated electronics (oil pressure, temperature and rpm) are allowed providing they are mounted securely. Tach/temp sensor devices may be attached to the spark plug or exhaust. A small hole can be drilled in the exhaust pipe to accommodate the sensor.
Any MOTOR that isn’t a sealed SPEC motor stated above will be considered a modified/open motor and will be held to the rules listed below.

OPEN ENGINE RULES

THE ONLY ENGINE PLATFORMS PERMITTED WILL BE HONDA GX390 OR CLONE.

The cylinder head may be ported, polished and cut.
Two angle valve jobs are permitted.
Any rocker arms (rev rocker) are permitted. Any rocker ratio is permitted.
Any valve springs may be used.
Any pushrod is permitted.
Both stock connecting rod or ARC Billet Aluminum connecting rod are permitted and may be used with or without a
bearing.
Any Honda or aftermarket piston is permitted, including flat top piston. Use of domed piston is prohibited.
The block may be milled to achieve zero piston pop.
Crankshaft output side may be shortened 1.25 inches maximum.
No grinding of crankshaft to allow for big lift cam is permitted.
Internal engine components – crankshaft and camshaft must be timed to factory timing marks. The use of the
internal counter balance is optional.
Any cam with maximum lift of .306 intake or exhaust that fits the engine block without any modifications to any of
the internal components of the engine or the engine block itself is permitted.
Flywheel may be a Honda or clone flywheel and may be lightened and balanced.
Billet aluminum flywheel is permitted.
Any timing advancement is permitted.
Any Honda or Honda clone carburetor is permitted. The use of any non-Honda type carburetor is prohibited.
No carburetor technical inspection is conducted
Only standard pump/track race fuel is permitted.
Fuel additives, or alcohol fuels, are prohibited.
Engine blow-by must be vented at the valve cover and attached to a catch can to prevent oil from escaping onto the racing surface.

Gear Ratio

A maximum final drive ratio of 4.29 is required. 14t, 15t, or 16t clutch drive gear must be used to obtain the final drive ratio. Any dry centrifugal clutch is permitted. No transmissions, belt driven torque converters, oil bath clutches, or axle clutches are permitted.

Body

All bodies must be styled to resemble a traditional stock car/truck racing body.
All bodies must be properly maintained and not in a state of disrepair at the beginning of any event.
The roof opening must be hinged in the front only.
Roof, hood and trunk must be held shut with positive fasteners.
Body exterior dimensions shall be no more than 120 inches long and 47 inches in width.
Body must remain level with chassis and cannot be offset on frame.
Bodies cannot be altered from original manufacturer.
Fenders may be altered for tire clearance only, with no fender flairs permitted.
A non-adjustable spoiler must be attached to the rear deck lid.
The spoiler must maintain the same contour as the production deck lid with a minimum angle of 35 degrees.
Windshield Lexan must be a minimum thickness of .060. Lexan must be attached by rivets.
Bracing is permitted on windshield or rear window. The left side window must have a window net fastened to the roll cage.
The right-hand window must have a Lexan window or a window net.
Wink-type dimensional mirrors are permitted with a maximum width of twenty-eight (28) inches.
Side view mirrors cannot extend beyond the widest part of the car body.
A maximum of two (2) openings with a total of sixteen (16) square inches are permitted in the nose of the car. No openings are permitted in the rear body section.

CAR NUMBERS

Numbers must be at least twelve (12) inches high, located on the center of the door and affixed to both sides of the car. A number eighteen (18) inches high must be affixed to the roof, reading from the OUTSIDE of the racetrack. All cars must display their number using three (3) inch high numbers on the right front and rear bumper areas of the car. ALL first-year or rookie drivers are required to display a yellow “Rookie Stripe” across the rear of the car.

Chassis

At post-race inspection a car in race-condition with driver must weigh a minimum of 650 lbs. for Spec Motors 750 lbs. for modified motors. Fuel cannot be added after the race to meet the weight requirement.
If weight is needed to meet minimum pre-race requirements all ballast must be in solid form. Ballast can be solid lead bars, blocks, or lead poured into square metal stock (no buckshot or BBs). Ballast must be painted white or a florescent color and must be marked with the car’s number for easy identification. Ballast must be securely attached to frame rails so as not to slide front to back or side to side. If ballast comes loose and becomes debris on the racing surface during a heat race, that competitor will be disqualified for that race and no points will be awarded. If ballast is lost during the feature event, that competitor will be disqualified from that event and no points or payout will be awarded.
Dashboards must be constructed of aluminum and securely fastened in place. Dashboards may be painted flat black.
Switches must be installed on the left side of the steering column.
The ignition shut-off switch must be labeled to show on and off.
One engine cooling hose from the outside of the vehicle to interior of engine compartment is permitted. The hose must be mounted in the right rear side window. The hose, or an extension thereof, must not extend more than 1 inch past the inside edge of the firewall or engine covering deck lid. The diameter can be no larger than three (3) inches.
The rear window may not be altered or drilled.
An engine covering deck lid is a requirement and must extend to the body in all directions. Bumpers must be hollow steel tubing and fastened to chassis.
If a car is submitted for technical inspection with a completely flat tire caused by a racing or on-track incident, the competitor will be permitted to add a maximum of eighteen (18) lbs. of air to the tire or the wheel and tire may be replaced with another of eighteen (18) lbs. maximum pressure) for the purposes of inspection.
Battery must remain in its stock location just ahead of the left rear tire and securely mounted in its battery box. Battery main shut-off switch and charging post are permitted and must be securely attached to the firewall on the left side on the seat. The positive terminal must be insulated.
Two-way radios are required under the age of 16 years old.

Rear Axle

Only one-point-two-five (1.25-inch) steel or chrome moly hollow axles are permitted. Maximum axle length is forty (40) inches. Aluminum axles are prohibited. A snap ring on each end of axle must be in place and mandatory safety wiring in place.

Tire Track & Wheels

Cars must maintain a tread width between forty-three (43) and forty-five-point- five (45.5) inches measured at the widest point (sidewall) of the tire set at zero toe-in. Aluminum spacers are permitted to utilize maximum front tread width. Max wheel size of 8 inches

Wheelbase

The maximum allowable wheelbase for either side of the car is sixty-point-five (60.5) inches. The minimum allowable wheelbase for either side of the car is fifty-nine-point-five (59.5 inches). Wheelbase will be measured with the front and rear tires on each side in line with each other. A straight edge or string must touch the front and rear sidewall of the front tire and the front sidewall of the rear tire (three points). The measurement is taken from the front edge of the front wheel to the front edge of the rear wheel. The process is the same on the opposite side of the car.

Ride Height

Chassis height must be at least two inches (2.00) inches ground clearance measured at the lowest point of the chassis, not including welds or fasteners. No part of the engine or suspension can be lower than frame clearance. Ride height of the car will be checked with the driver in car on level ground as raced. There is no body ground clearance requirement. No mechanical or electrical device for adjusting ride height is permitted. Maximum left side weight 55%

Suspension

Shocks must be single-valve, non-adjustable.
A combination of shocks part numbers are permitted.
One shock, one spring per corner.
Custom or specialized shocks and/or springs are prohibited.
Two (2) front straight springs and two (2) rear straight springs only are permitted. Any spring rate is permitted.
No variable rate springs or spring rubbers are permitted.

***RULES AND GUIDELINES SUBJECT TO CHANGE***

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