2010
PREFACE
These rules
are in effect for the 2010 NP4A racing season. It is intended that the rules
not change during the racing season. However, in the event a rule needs to be
changed in order to equalize competition it will be done. Please understand
that these engine, carburetion and weight rules were developed in order to
enhance competition among many different types of engines. If your team is affected due to the use of
high performance equipment and is faced with having to add weight or scale back
and set aside some expensive parts, please keep in mind that your willingness
to do so will help move the entire Pro-4 concept forward to a brighter and
stable future. At the completion of the
five-race series, all technical data will be reviewed and a determination made
of whether any changes are warranted.
DISCLAIMER
Auto racing
by its very nature is a dangerous sport. While every effort has been taken to
insure the safety of the drivers, crew, and spectators, this compilation of
rules and procedures does in no way imply assumption of responsibility or risk,
ultimately, each participant is solely responsible for his or her safety.
1. Any
fabricated tube-frame race car, perimeter or offset.
2. No
Jeeps, dune buggies, or convertibles.
3. No
all wheel drive, (AWD) cars.
1. All
cars must have complete bodies with no sharp edges, fabricated of nonferrous
materials that resemble a late model stock car complete with a nose and tail
panel.
2. All
window materials, front, rear, and sides must be of polycarbonate, (Lexan) material. No acrylic, (Plexiglas) material.
3. All
bodies must be brightly painted and have numbers on both
sides, top, nose and tail.
4.
Hood scoop/air cleaner may not be higher than 5 inches.
5.
Maximum rear spoiler height is 8 inches measured along the spoiler surface from
the spoiler base to the spoiler top edge. Aluminum may be used up to a spoiler
height of 5 inches. Polycarbonate, (Lexan) must be
used if taller than 5 inches to maximum length. No acrylic, (Plexiglas)
material.
6.
Firewalls, solid panels with no gaps or holes, of 24-gage steel or 0.065” thick
aluminum, minimum, required between driver and engine, fuel cell, battery, and
radiator. Interior trim panels beyond firewalls may be of steel or aluminum
less than minimum thickness required for firewalls.
7.
Body wheel wells must cover all four (4) tires.
1. All
chassis must be constructed of minimum 2 inch square or round by 0.090 inch
minimum wall thickness.
2.
Rear clip and front clip may be of 1-1/2 inch square or round by 0.090 inch
minimum wall thickness.
3.
Roll cage must be not less than 1-1/2 inch diameter by 0.090 inch minimum wall
thickness.
4.
Chassis track width must not exceed 78 inches measured outside -to-outside of
the front tires at spindle height with toe-in or toe-out measurements at front
of tire and rear of tire averaged.
5.
Maximum left side weight is 58% with driver and fuel on board.
6.
Chassis wheel base, measured on the left side, is 94 inches minimum and 105
inches maximum.
7. Minimum Ride Height of 3” measured at the
left front corner.
8.
Driver accessible weight adjusters prohibited.
1. Any
13 inch diameter or 15 inch diameter stock car racing wheel of steel or
aluminum construction not to exceed 10 inches in width.
2. Open
Tire- Hoosier F35 left F45 Right /American Racer 131 /Goodyear (Stateline
Tire)
ENGINE DISPLACEMENT
Section One – Stock Production Engines/Cast Iron or Stock Aluminum
1800cc to
1999cc must weight 1lb per cc open carburetion
De-stroked
Ford 2300/w Stock Production cylinder head w/2 venturis 2000lbs
De-stroked
Ford 2300/w Stock Production cylinder head w/4 venturis 2050lbs
2000cc with
4 venturis must weigh 2050lbs
2000cc to
2350cc may weigh 2000lbs with 2 venturis
2350cc must
weigh 2075lbs with 4 venturis
2351cc to
2420cc must weigh 2200lbs with 2 venturis
2351cc to
2420cc must weigh 2250lbs with 4 venturis
Push rod
engines may remove 50 lbs off total weight
To make this clear to everyone,
these are standard engines that have been built to race, they are stock cast
iron or stock aluminum cylinder heads from the factory, they are not twin cam
engines, there is a section for them below. If you still have a questions
please contact us.
Section Two – Ford 2300’s with aftermarket aluminum cylinder heads and
De-stroked Engines
Cars using
the following engine combinations must meet these weights
Ford w/aluminum
D-Port cylinder head ….w/2 venturis w/4 venturis 2100lbs/2150
Ford
w/aluminum SVO / ARCA cylinder head….w/2 venturis w/4
venturis 2200lbs/2250
All
de-stroked Ford 2300/w D-Port Aluminum cylinder head must weigh 2100lbs
All de-stroked
Ford 2300/w SVO or ARCA Aluminum heads must weigh 2200lbs
This engine is actually 2048cc and
is allowed open carburetion at these weights.
Section Three – Twin
Chevy 2000
Echo Tech w/2 venturis w/4 venturis……………1900lbs/2000lbs
Chevy 2200
Echo Tech w/2 venturis w/4 venturis……………2100lbs/2200lbs
Honda 2000
……………………………………………..2200lbs
Honda 2200………………………………………….
….2300lbs
The Honda engine is allowed open
carburetion at these weights, No V-Tech engines.
Section Four – Rotary Motors
12A Stock block
must weigh 2000 lbs
12A Ported block
must weigh 2300 lbs.
13B Stock block
must weigh 2350 lbs.
Please remember that the above
weights were determined by current performance and if any one engine
combination shows it can become dominate, action will be taken to even the
playing field. Please understand that were are not in
anyway trying to combat your ingenuity but just trying to keep as many teams as
competitive as possible.
1.
Inline 4 cylinder, 4 cycle gas engines produced for use in foreign or domestic
automobiles for sale in the
2.
Substitution of production cast iron block with aftermarket aluminum block is
prohibited
3. Any
transmission with 2 forward gears and operable reverse may be used.
4. Any transmission adapter may be used. Tech
approval required.
5
Cars using open stock style clutch must use scatter shield
minimum 180 degrees on driver’s side of bell housing; 270 or 360 degrees are
recommended. Minimum steel thickness is 3/16 inch. Minimum aluminum thickness
is 1/4 inch. Tech approval required.
6. Starter and clutch assembly
must be operable.
7. Exhaust must exit behind
driver.
8. Exhaust noise level shall
meet track requirements.
9. Oil cooler, remote oil filter, dry-sump, external
drain lines and attachments shall be of proper design and strength to resist
bursting or leaking. Tech approval required.
10. Radiators shall remain
inside body shell. Cooling fans, engine driven or electrical, must be enclosed
within shroud. Tech approval required.
11. Separate overflow
containers with 1 quart minimum capacity required for radiator and
crankcase/dry sump ventilation system. Crankcase/dry sump overflow container
must be metal. Tech approval required.
12. Any rear end including quick
change may be used.
13. Suspension type is open.
Titanium or magnesium components are prohibited.
1. Six
point roll cage mandatory of 1-1/2 inch minimum diameter x 0.090 inch wall
thickness minimum ERW or DOM.
2.
Roll bar shall have at least one diagonal brace from top of hoop to bottom.
3.
Minimum of 3 horizontal door bars required on driver’s side of cage and 2 door
bars required on right side of cage. All door bars shall have vertical braces
welded between them. Top left door bar may not be lower than 3 inches below
driver’s window opening.
4. One
overhead bar from front to rear in center of the halo that is out of reach of
the driver’s helmet when driver is strapped in, is
required.
5. One
vertical (Earnhardt Bar) is required from middle of
halo hoop front down to cage front hoop at dash level.
6. Two
braces from within 6 inches of the top of the main roll bar hoop down to the
rear clip are required. Braces are to extend as far back as the body will
allow.
7.
Energy absorbing padding must be installed on all bars and tubes in driver area
where contact maybe made between driver extremities and bars.
8.
Minimum of 2 windshield braces must be placed behind windshield. We recommend 3
9.
Nerf bars shall be minimum one inch square or one inch
diameter round tubing with rounded ends located within body.
1.
Bumpers required on front and rear of car inside front nose piece and rear
bumper cover.
2.
Center of bumper shall be 16 inches from ground plus or minus 2 inch.
1.
2.
3. If
battery is installed inside driver compartment, it must be enclosed inside a
metal box of 20 gage minimum thickness.
1.
Aluminum or steel drive shafts permitted. Composite drive shafts are
prohibited.
2.
Drive shaft must be painted white with car number on it.
3. Two
steel; drive shaft containment loops or straps, 0.125” x 1” minimum cross section are required. One at each end of
driveline.
1.
Brakes shall be on all four wheels and operable at all times.
2.
Driver adjustable brake biasing mechanisms are approved.
1. A
2.5 lb. (minimum) carbon dioxide or dry powder, Coast Guard approved, with gage
in working order and fully charged extinguisher is required.
2.
Extinguisher must be in drivers reach while strapped in car.
3. An
on board Halon fire suppression system is recommended, but not required. If
installed, minimum one nozzle each in engine bay and driver area. Safety note: Position nozzle and aim it away
from driver in direction of anticipated flame sources. Halon can cause frost
bite.
4.
Fire extinguisher or Halon fire suppression system must be securely mounted in
car.
5.
Each car must have a 5 lb. minimum fire extinguisher with current inspection
tag readily accessible in pit area.
1. A
master electrical shut off switch must be installed within easy reach of the
driver and safety crew members to kill the electricity to all electric
components in the event of an emergency.
2. If
the master shut off switch cannot be located within easy reach of safety
personnel, then an additional master shut off switch must be installed in a
location accessible to safety personnel.
3. The
master shut off switch must be clearly marked.
1. Seat belts, 3” minimum
width, shall have metal connectors and be firmly attached to the roll cage by steel brackets of
sufficient strength. Tech approval required.
2. Shoulder harness, 3”
minimum width, shall be double straps attached separately to the roll cage by
metal brackets that are part of the roll cage. “Y” belt shoulder harness with
single point attachment to roll cage is not allowed. Tech approval
required.
3.
Anti-submarine belt, 2 “minimum width, shall be attached to the seat bracket
that is part of the roll cage.
4. All
belts expire 3 years following
date of manufacture and must be replaced.
5.
Hutchens, neck collar or similar restraint device is highly recommended.
1.
Safety window net of either mesh or web construction are required in driver’s
side window. Must not be over 3 years
old
2.
They must be fastened securely with a quick release type latch that can be
activated from either inside or outside the car.
1.
Seats shall be racing type with head rest behind driver’s helmet.
2.
Right side head restraint required. Left side head restraint recommended.
3.
Seats shall be securely fastened to roll cage in upright position.
4.
Seats of fiberglass construction are not
allowed.
5.
Right and left side leg restraint panels are recommended.
1.
Fuel cells are required with 8 gallon minimum and 12 gallon maximum capacity.
2. In
2009 sides, front and rear of fuel cell must be plated.
3.
Fuel cell bladder must be enclosed in metal container.
4.
Fuel cell metal container shall be mounted securely to chassis with steel tube
frame surrounding container and minimum of 2 straps on top.
5.
Fuel pump shall not be mounted in
driver compartment and shall be mounted inside either frame rail.
6.
Fuel lines passing through driver compartment must be encased in metal tube or
protected by woven stainless steel wire mesh covering on outside of fuel hose.
7.
Fuel cell shall be electrically grounded to chassis.
8.
Fuel cell filler cap shall be tethered to the fuel cell or fuel cell
containment straps with a short length of light gage safety cable or ball
chain.
9.
Electric fuel pumps must be wired with an oil pressure operated shutoff switch
in the electricity supply line. A momentary override switch may be used when
starting the motor.
1. All
removable ballast weights must be painted white and have car number on them.
2.
Two-way radios are allowed and recommended for driver and spotter.