2013 Mod-Mini/Super 4 RULES
Any American or foreign production
economy sedan, coupe, station wagon, or pick-originally equipped
with a four cylinder engine. No all wheel drive, rear, or mid-engine
cars. Maximum wheelbase is 100.5”. Exceptions to the wheelbase
rule may be made on some mini trucks that may exceed the 100.5”
Vehicles must be completely
stripped. No factory interior, no chrome, absolutely no glass
anywhere, no lights, etc.
ENGINE, CARBURETION, IGNITION
Water cooled in line four cyliner
production engines only.
2600cc maximum displacement.
OEM heads and blocks only.
Crossbreeding of head, block, and internal parts is allowed if they
can be bolted together without alteration.
Single and dual Camshafts
permitted. Camshaft specs open on single cam engines. Dual camshaft
must weigh 100lbs over minimum weight.
Maximum 4 valves per cylinder.
Roller Rocker or roller cams nots
permitted. Adjustable cam devices ok.
Cylinder head porting and
polishing permitted on single cam engines.
Valve springs, retainers, and
valve size open on single cam engines.
No purpose built race engines, ie
Cosworth, Indy, etc.
Header will be allowed. Cockpit
exhaust OK if shielded from driver. No exhaust may invade drivers
side of cockpit.
Stock or aftermarket pistons may
Connecting rods must be ferrous.
intentionally left blank
No dry sump oiling. No external
pump oiling. Stock, homemade, or aftermarket wet sump pans allowed.
Must use a single two barrel
downdraft Carburetor-500CFM max. A stock, modified, or aftermarket
intake manifold is OK.
There shall be at least two
throttle springs on the carburetor. Each of them shall be able to
close the throttle without the other one.
Fuel injection, turbo charging, or
supercharging shall not be allowed. Vehicles originally equipped
with fuel injection must be adapted to run a carburetor.
Ignition will be stock or
aftermarket. No magnetos. Distributors may be locked out for advance
system. Aftermarket coils allowed. Any type distributor may be used.
Engine setback allowed. #1
spark-plug must not be more than 4” behind center of upper
DRIVETRAIN & BRAKES
Single disc, stock appearing
clutch only. No Ram couplers. No direct drive. Automatic
transmissions must have a functional O.E.M. Torque converter
Stock, lightened, or aftermarket
flywheel OK. Aluminum flywheels permitted. Must be stock diameter
for block used.
A 180 degree Scatter shield must
be installed underneath or over the floorboard using a minimum1/8
inch steel plating to protect the drivers legs.
Drive shaft must be painted white.
No aluminum drive shafts.
Rear-end shall be stock type only.
Make and model of rear-end may be changed.
No aftermarket or quick-change
Open, Limited Slip, Welded, or
otherwise locked rear ends shall be allowed.
Must have working brakes on at
least three wheels. Locking the rear end does not constitute as one
Adjustable brake proportioning
valves OK. Pedals open.
In-cockpit steering may be
modified to suit drivers taste, but must be kept on the left side of
the cockpit, no center steering.
ROLL CAGE CONSTRUCTION
Shall be at least a six point cage
with four uprights connected at the top.
Main cage must be constructed of 1
1/2” diameter tube with .095” wall minimum. Shall not consist of
black iron or galvanized pipe.
Must completely enclose the
Minimum of 3 horizontal door bars
on drivers side and 2 door bars on passenger side.
Roll cage must secure to the frame
or floor pan on unibodies cars by welding solidly around each
upright bar or by welding each upright bar solidly to a 4”x4” by
¼ plate then welding or bolting this plate solidly to the floor.
Gusseting on all bar junctions
Roll cage must have a vertical bar
in front of windshield.
Roll bar padding (fire retardent)
is mandatory where driver can come in contact with the cage.
BODY, FRAME, & SUSPENSION
Stock frame and unibodies may be
tied together with steel tubing front to rear but may not be used to
completely replace original sections with the exception of the rear
clip from the forward mount point of the rear suspension to the rear
of the chassis.
A tube chassis may alternatively be
used that retains a stock O.E.M. Front clip. Ford Fox platform and
minitruck recommended. Must retain O.E.M. Crossmember. If tube
chassis is used (defined as not retaining unibody or frame rails
from front firewall area to forward most rear suspension points).
The vehicle must weigh 250 lbs over minimum (ex. 2300Cc engine must
Upper control arms may be
aftermarket and is to be mounted in stock location only. Lower “A”
arm to remain stock to clip, can be modified or camber change.
Weight jacking devices are
allowed. No cockpit adjustable weight jacking devices allowed.
Any shocks may be used including
coil overs. May be relocated to a better location. One shock or
strut per wheel only, excluding pullbar.
Suspension mounting points may be
altered but suspension must mount in the stock manner for the
chassis being used. *A stock type 3 link is also allowed, mounting
can be adjustable.
Stock or aftermarket bodies OK.
Minimum 22 gauge steel or aluminum stockcar body complete with four
fenders, hood, and roof panels. No fiberglass bodies. Fiberglass
roof OK. Body must be firmly attached to secure mounting points.
Aftermarket plastic nosepiece and rear bumper OK. Truck bodies must
have a toneau cover over bed area.
No excessive aerodynamic air dams,
wings, rear sail panels, etc. Subject to approval
Spoilers OK. Limited to 6”
height as measured off the top of the deck lid.
Nerf bars OK provided they are no
farther than 2” from the body of the vehicle. Ends must be bent
into prevent catching.
Drivers compartment must be safely
sealed from the engine bay, fuel cell, and exhaust. Right side of
drivers compartment may be boxed off to allow the exhaust system in
Minimum weight is 1750 lbs. Minimum
weight for cars over 2100cc will be 2050 lbs. Stock clip tube chassis
must weigh 250lbs over minimum. All weights are after race including
driver and all fluids. May not add fluids after race.
TIRES & WHEELS
Any type steel wheel with a
maximum of 8”. Any offset is allowed.
Bead lock permitted on right rear
only. Right front beadlock permitted on FWD cars.
DOT Radial tires or racing tires
allowed. Medium to hard compound tires only designed for max 8 inch
No spiked or studded snow tires.
Grooving and siping permitted.
1”lug nuts recommended.
Wheel spacers must not exceed 1”
Any chemical substance which
alters the tire(s) factory traction characteristics (e.g. tire
softener) is not allowed.
Pump or race gas only. No methanol
or nitro methane.
Racing fuel cell required.
Racing fuel cell and containters
may extend below the trunk floor but must be contained in a fully
enclosed box made of minimum 20 gauge steel. Maximum 16 gallons.
Any fluid transfer through the cab
must be shielded from the driver. Subject to tech approval.
Vehicles running an electric fuel
pump must have a functioning inertia switch.
A positive locking filler cap must
be used. Breather vents must be designed so that fuel will not
escape if vehicle is upside down.