Stock Production VW Bug

Last Updated April 10, 2024

DEFINITION

Vehicle limited to Stock VW sedan as delivered in the U.S.A.

GENERAL REGULATIONS

Entrants in this class shall comply with all applicable general regulations.

TECHNICAL REGULATIONS

Any questions concerning chassis combinations will be decided by referring to VW factory parts manuals and /or VW of America booklet. This is a stock production class and all components must remain stock except for those modifications allowed herein. If the rules herein don’t say that you can do it, you CAN’T do it and it will be deemed illegal.

NOTE: The TR abbreviations listed under this class (I.E. TR1 HELMETS) refer to TR cross reference listings in the front of this book. These TR cross-referenced listings are part of the class rules. Where a conflict occurs between the TR cross-referenced listing and a rule contained under this class, the rule contained under this class takes priority.

SAFETY EQUIPMENT

TR1 HELMETS

TR2 PROTECTIVE CLOTHING

TR3 EYE PROTECTION and DENTURES

TR4 HEAD AND NECK RESTRAINTS

TR5 FIRST AID KIT

TR6 EMERGENCY SIGNALING DEVICES

TR7 HORNS

TR8 REFLECTORS

TR9 FIRE SUPPRESSION EQUIPMENT

TR10 SURVIVAL SUPPLIES

SUSPENSION COMPONENTS

Front Suspension

Front axle torsion tube centers may be cut, rotated, rewelded to increase ground clearance or front torsion adjusters may be used. Original seams may be welded (not reinforced) on front beam. Shock tower may be additionally supported by the adding of a single gusset, gusset may not extend more than 2 inches above top torsion tube. Stock front spindles and trailing arms must be retained. No additional material may be added. Sway bars may be removed.

Filling of speedometer hole is permitted. Steering arm on spindle may be reinforced by welding a1/4 (.25) inch thick gusset from the top of the spindle to the end of the steering arm.

Front snubbers may be of any manufacture but must retain stock VW dimension and mounting methods. Suspension limiters allowed.

Rear Suspension

Rear suspension torsion bars may be of any origin. Rear suspension springs plates may be of any origin. Torsion bar adjusters are allowed. Torsion bar grommets may be of any manufacturer but must retain stock VW dimensions.

Rear torsion bars may be additionally supported only by the attachment of a terminal end (support member) of the roll cage.

Rear shock tower may be removed to body mounting bolt hole. Lower rear shock mounts may be removed and or replaced. Rear shocks may be relocated, but must bolt directly to rear trailing arm or swing axle. No remote mounted shocks.

Rear trailing arms must remain stock, shape, size, and configuration, but may be reinforced by adding material.

TR11 SHOCK ABSORBERS and BUMP STOPS

Only one shock per wheel is allowed. Stock front shock mounts must be utilized. Shock mounting bolts may be changed to a maximum of 1/2(0.5)inch in diameter. Any manufacture shock allowed with 2" maximum outside diameter. Rear shock must not have an extended length longer than 18 inches, center of mounting hole to center of mounting hole. Cooling fins and/or reservoirs allowed. No air shocks or coil over shocks are allowed. No hydraulic bump stops allowed. No bypass shocks allowed.

TR12 SECONDARY SUSPENSION

No secondary suspension allowed.

TR13 WHEELS and TIRES

Any steel 4"x15" wheel that bolts to a stock VW brake drum may be used. Cast aluminum wheels weighing 15 pounds or more may be used. Aluminum wheels must be no larger than 4.5”x15”. All wheels must bolt to stock VW rims. Bolted hubs may be replaced with studs. Any manufacturers tire and size allowed up to 31" tall and 10" wide as mounted and inflated on a 4" wide rim with 18 lbs of air. Spare tire is mandatory but may be mounted any place within body shell or trunk.

TR14 FASTENERS

STEERING and BRAKE COMPONENTS

TR15 STEERING

Any manufacturers steering wheel may be used. Steering box must remain stock but shims may be used between pitman arm and box. Steering components such as ball joints, steering arms and tie rods must remain stock. Steering shaft is open. Pillar blocks may be used.

TR16 BRAKES

Original VW type 1 drum brakes only on all wheels. Front and rear drums may not be interchanged. Any combination of brake linings allowed as long as stock dimensions are maintained. Any combination of VW master and wheel cylinders are allowed. Emergency brake is optional but if removed the resulting opening must be covered.

ELECTRICAL SYSTEM

TR17 IGNITION

Battery ignition only, no magnetos. Six or twelve volt systems may be used regardless of year model. Any manufacturers distributor may be used. Any VW type alternator or generator system in the stock location may be used.

TR18 BATTERIES

Battery must be relocated.

TR19 LIGHTS

Additional lighting is permitted. Headlights are optional for short course only. Stock headlights may be replaced with any brand so long as original mounting position is used. Pre-1967 model headlight lenses may be removed. Tail and stoplights must remain functional. Front and rear turn indicators are optional. Backup lighting may not be directed towards the engine compartment or function in any gear but reverse.

TR20 STARTERS

FUEL SYSTEM

TR21 FUEL

TR22 FUEL TANKS

Fuel cells may be located anywhere and have any capacity. Stock tank may be used in the stock location. Any type fuel shut-off valve allowed. Stock fuel pump must be used. Electric fuel pump may be used but must be used as a backup and routed through the stock system.

TR23 FUEL FILLERS LINES, VENTS, and CAPS

Fuel fillers may penetrate and extend through hood but must have a drain/catch boot or grommet system to prevent fuel spillage in front compartment. Fuel cell filler may be located in the center of the tank and have a maximum of a 2.25" internal diameter neck.

ENGINE, TRANSMISSION and DRIVELINES

TR24 ENGINE and ENGINE DISPLACEMENT

Engine must utilize VW series type 1, 1600cc, U.S. Model sedan components and dimensions. The maximum allowable engine displacement is 1600cc as delivered from the factory.

Engine Case

Any VW type 1,2,3 or "universal" case is allowed. The following modifications may be made to the stock case:

1. The case may be align bored and machined for cam bearing.
2. The case may be drilled and tapped for oil pressure and/or temperature sending units.
3. The case may be machined to allow the installation of a crank pulley seal.
4. Case savers may be installed for cylinder head studs.
5. Cylinder seating surface may be machined.
6. Oil galleries may be enlarged to 10mm.
7. Threaded oil gallery plugs allowed.
8. Oil squirters are allowed.
9. Case may be full flowed.

Oil Pump

Any manufacturers oil pump is allowed. No deep sumps, dry sumps, or sump alterations. Windage trays are allowed. The use of any oil bypass pistons and springs are allowed. No oil reservoirs allowed.

Fuel Pump

Stock fuel pump must be used. Electric fuel pump may be used but must be used as a backup and routed through the stock system. Any fuel filters and fuel pressure regulators of any type may be used.

Pistons

Pistons must be stock 3 ring only. Pistons and cylinders may be any manufacture as long as the original stock dimensions are maintained. Any type wrist pin retainers. Piston assemblies may be statically balanced to the equivalent weight in grams of the lightest original unbalanced piston, wrist pin, etc.

Crankshaft

Crankshaft must be stock VW. Crankshaft may be balanced. Crankshaft maximum journal resizing is limited to .030" undersize. No polishing or lightening of crankshaft is allowed. Offset grinding allowed max stroke 69.5. Any crankshaft gear is allowed. Any manufacturers engine bearing may be used as long as the stock dimensions are maintained. Power pulleys are allowed. Pulleys may be balanced. Sand seals may be used. Any VW flywheel may be lightened and balanced. Flywheels may be eight dowel pinned and any gland nut and washer. No aluminum flywheels are allowed. Any manufacturers clutch disc or pressure plate allowed but must retain original stock VW diameter. Clutch and pressure plate may be balanced. Connecting rods may be statically balanced, but not polished or profiled. Balanced weight of the connecting rods in grams should be equivalent to the lightest original nonbalanced stock rod.

Heads

Heads may be U.S. sedan stock single port or dual port or their equivalent. Heads may be flycut for clean up. No porting or polishing is allowed. Only dual port heads from Brazil, part number 040 101 375 2 or 040 101 375 13, 040 101 375 19, or stock OEM heads will be allowed.

Intake manifold is restricted to a stock 34mm original equipment center section or its replacement. A 1½-inch (1.500) long by half-inch (.500) diameter tube may be weld two inches below carburetor flange. A maximum of a ¼ inch (.250) may be removed from each end of the center section for clearance. A slip tube with a 1 5/8 inch (1.625) diameter, two inches (2.000) long may be welded to the end of the runners to allow the use of a better hose connection. No porting or polishing. End castings must be original equipment VW, with VW logo and part numbers. No porting, polishing, or matching of ports allowed. Balancing slot may be welded close. Vacuum hole may be plugged. A 34mm to 30 mm carburetor adapter must be used. The only carburetor adapter that is allowed is the EMPI part number 98-1293-B.

Camshaft, Valves, Lifters, and Rocker Arm(s)

Any camshaft, camshaft gear, valve spring retainers, valve springs and lifters are allowed. Valve spring seat diameter, in head, must remain stock VW. Valves must be stock 45 degrees. One-piece valve are allowed. No polishing or profiling of valves allowed. Valve guides may be steel, bronze or cast iron. Valve guide seals are allowed. No grinding or polishing in the port including valve guides. Any camshaft may be used which will allow the use of the standard stock VW 1600cc rocker arm(s). The rocker arm(s) may be resurfaced to permit the use of swivel feet or similar devices. No other grinding or changes to the rocker arm(s) are allowed. No roller or needle bearings will be allowed as part of the camshaft or as an interface between the rocker arm(s) and the camshaft. Push rods and push rod tubes may be of any manufacturer. Rocker arm valve adjustment screws and wave washers may be of any origin. Clips on rocker arms may be wire tied. Rocker assemblies subject to post race examination.

Fan Shroud

Must use stock fan shrouds. Heater tubes are optional.

Carburetor

Air cleaner location is optional and may be of any manufacture. Velocity stacks may be used as long as they are not welded or bonded to the carburetor. Stock VW carburetors 30 pict 1, 2, and 3 or the Solex H-30-PIC replacement must be used. Maximum venturi size of carburetor is 24.10mm. No internal modifications in the carburetor venturi or throttle blade are allowed. This includes no removing of parts, no grinding, polishing, or filing. Intake manifolds must be stock VW. The cutting of the manifold to compensate for head milling is allowed but rewelding will not be allowed. Those manifolds, which have been cut and rewelded, must be cut again and assembled by use of rubber hose and clamps or by some other suitable method so that the interior of the manifold can be inspected during post race technical inspection. No chemical milling of manifold or carburetors. Automatic choke housing may be removed. Choke plate and shaft may be removed. Electric needle valves are optional. The stock float bowl vent may be moved and/or plugged. An external float bowl vent may be incorporated. Any air and main jet may be used.

LOW COMPRESSION ENGINE OPTION

1600cc maximum displacement and 8 to 1 compression ratio, must use the same heads as high compression engine with same valve size and no porting at all. Stock VW end castings with VW part numbers must be used, no polishing allowed. An EMPI or WEBER 40 or 44 idf carburetor may be used and tube style intake manifold, No Plenum Manifolds allowed. Must use a maximum 26mmventuri This is a pump gas only engine option with a maximum of 91 octane.

TR25 ENGINE REPLACEMENT

TR26 TRANSMISSION

Type 1 bug, 4-speed transaxle only. Heavy-duty side plates and differential allowed. 8:33 ring and pinion and drive gears must be used only. Must retain stock gear ratios. No closed ratio gears.
Axle over tubes are not permitted.

Other internal modifications are optional.

Rear transaxle mounts may be supported by a maximum of two (2) vertical straps of 0.25"x1" dimension. Adjustable straps are optional.

Any gearshift lever allowed.

May use any manufacturers Type 1,2 or 181 stub axle.

May use any VW CV joint. Over sized bolts allowed.

TR27 THROTTLES

Stock pedals with no other modifications are allowed.

TR28 EXHAUST

Any exhaust system may be used.

TR29 DRIVE SHAFTS

TR30 FLYWHEEL SHIELDS

TR31 FLUID COOLERS

Any manufacturers oil cooler is allowed with the location optional. Full flow systems are allowed. No deep sumps or dry sumps will be allowed. Late model housing is approved.

TR32 AUXILIARY EQUIPMENT

TR33 SUPERCHARGERS and TURBOCHARGERS

VEHICLE SAFETY EQUIPMENT

TR34 ROLL CAGES

There are no restrictions as to terminal points of the roll cage.

TR35 SAFETY HARNESS

TR36 SAFETY NETS

TR37 SEATING

Any manufacturers seat is allowed but must remain the approximate stock location. If stock seat mounts are used they must be reinforced using at least two U Bolts per seat runner.

GENERAL VEHICLE COMPONENTS

TR38 DRIVERS COMPARTMENT

Rear seat, upholstered panels, headliner and carpets may be removed. Dash may be covered with sheet metal to facilitate the installation of additional engine instrumentation.

TR39 DOORS AND LATCHES

Doors must remain functional and in original stock location. Doors may have original hinges with a workable latch. Secondary positive latching devices are mandatory.

TR40 FIREWALLS

TR41 BALLAST

TR42 WEIGHT

TR43 FLOORBOARDS

Serial number required on floor pan. No alterations to floor pan are allowed. Original seams may be rewelded. Undercoating may be removed. 1965 or earlier model car belly pans may be interchanged. 1966-1968 belly pans may be interchanged. 1969 or later may be interchanged. All must maintain original suspension type.

TR44 BUMPERS and HAZARDOUS PROTRUSIONS

Original stock bumpers and over-riders must be retained. Stock VW bumper stiffeners are allowed. Brush guards may be added to stock bumpers.

TR45 MIRRORS

TR46 SKID PLATES

Any type front or rear skid plate may be used. Front skid plate may be attached to lower torsion bar tube with a maximum of two (2) 0.375" U-bolts or two (2) U clamps with a maximum width of 1.5" attached to the skid plate. Skid plate may be extended forward and upward to but not above the top of the front bumper.

TR47 STORAGE

TR48 CHASSIS and BODY

The vehicle must retain full stock chassis and body with no modifications allowed. Rear apron may be removable to facilitate engine removal, but must retain stock external appearance. Body must be VW type 1 bug or suntop bug. No convertibles, Ghias, 181's (Things), Variants or super beetles.

Running boards may be removed.

Front and rear hood latches may be modified or replaced. Hinges must remain stock.

A hole no larger than one (1) inch in diameter larger than the shock OD may be cut in the rear fender well to allow for the rear shock.

Fender lips on the underside may be flattened to prevent cutting of tires. A rod of 0.25" maximum diameter may be welded under the outside edge for additional strengthening.

TR49 HOSES

TR50 IDENTIFICATION MARKINGS

Unlimited Off-Road Racing will assign race numbers.

TR51 ADVERTISING on VEHICLES

TR52 RADIO EQUIPMENT

TR53 WORKMANSHIP

TR54 TRACKING DEVICE