Here are the rules for the Southwest jr fuel assosiation. Hope this answers your questions.
Rules Committee Members:
Mike Buchanan, Jay Briggs & Ron Muncy
Designation:
- B/JF Preceded by car #
- B/JF: 3.65 pounds per cubic inch, 1,375 pound minimum weight. Limited to OEM cast-iron Hemi, 23 degree Chevy (no raised runner) OEM or aftermarket replacement style, OEM Ford or aftermarket replacement style heads. Other makes fall under same category as above. + or - 3 degrees maximum allowance for milling of heads.
Electrical:
Batteries - If there is a battery on the car to start the car, battery disconnect switch is mandatory.
Delay Boxes and or Related Devices - PROHIBITED
(See NHRA General Regulations 8.2, 8.
Ignition - Single magneto or single coil ignition only. (Magneto limited to 20 amp)
Cylinder Heads:
Effective 01-01-2013
Cylinder heads limited to" traditional porting", - no cutting and relocating of cylinder head material.
* HEAD BOLTS- are to be in original (oem) locations, and of traditional lengths and factory diameters
* LIFTER BORES and CAMSHAFT LOBES: must be in "traditional location as to oem specs".
Engine:
- One internal - combustion, reciprocating, and OEM type engine permitted. Cast iron block mandatory. Maximum 410 cubic inches. No collector style headers allowed. Dry sumps and evacuation systems permitted. Gen. Regulations 1:2
Timing / Retard Devices:
Timing retard or advance devices of any kind form or function are PROHIBITED. MUST BE A FIXED TIMING from start to finish of race.
Exhaust System:
- Zoomies Only
Fuel:
- Methanol mandatory. All other fuels or performance enhancing additives prohibited. Gen. Reg. 1:6 NHRA
Fuel Systems:
- Injectors will be individual stack style, no scoops of any kind permitted. Cast manifolds ONLY, down nozzles PROHIBITED. ONLY ONE nozzle per cylinder allowed. No others of any kind for any reason allowed!
Nozzles must installed in intake "not cylinder head"No external modifications to manifold that alter or change "as cast shape or size." Modifications limited to "porting of intake runners." Use the intake as it was cast. Trying to keep expensive and exotic machine work out of the picture. Ex: cutting, welding, etc.
- A fuel shut off operable from drivers seat required
- Maximum of one fuel pump only
- Round butterfly only, maximum diameter is 2.875 inches as measured across the throttle butterfly shaft. No rotary style injectors allowed.
- Effective as of Jan 2008: A properly fitting, SFI Spec 7.1, 7.2 or NHRA accepted Lower Engine Retention Device is REQUIRED. Dragsters may use a belly pan in lieu of a device attached to the engine. Belly pan must extend from frame rail to frame rail, and extend forward of harmonic balancer and rearward of flywheel, and must incorporate a minimum 2-inch high lip on ALL sides.
Drive Train:
- Driveline - A full cover must enclose the driveline if universal joints are used. Cover material must be minimum of .063 steel or .125 inch aluminum. Gen. Reg. 2:4.
- Rear End - Aftermarket axles and axle retention device mandatory. Spool permitted. Gen. Reg. 2:2, 2:11.
- Transmission - Limited to automotive production, automatic transmission with a torque converter, maximum two forward speed "gears." Full shift pattern mandatory. Mechanical or electrical lock up converters prohibited. Transmission brake permitted. Electric transbrake release system only. Maximum one transmission brake solenoid permitted. Automatic transmissions flex plate meeting SFI Spec 29.1 mandatory. OEM transmission cases "with proper shields," aftermarket replica case, permitted.
- Pneumatic, electric, or other non-OEM automatic shifters prohibited. Gen. Reg. 2:14
- Transmission shield meeting SFI Spec 4.1 mandatory. Automatic transmission flex plate shield meeting SFI Spec 30.1 mandatory. Gen. Reg. 2:14
- Any electronic/electric or pneumatic controlling of shifting process of any kind prohibited. All shifting functions must be a physical/manual function of the driver.
Brakes & Parachutes:
Brakes - All cars must be equipped with two rear wheel disc brakes, and a functional mounted parachute.
Tire Size - Maximum rear tire size is 12 inches as measured across tread surface. Maximum wheel width is also 12 inches.
Safety Equipment:
- Driver / Head Restraint System Mandatory as required by NHRA.
- Helmet and Protective Clothing: Minimum Snell SA 2000 helmet as required by NHRA.
- A SFI Spec 3.2a/15 full fire suit (1 or 2 piece) allowed as required by NHRA.
- All suits to include the following: neck collar SFI Spec 3.3 mandatory, boots or shoes 3.3/5 as required by NHRA mandatory, gloves 3.3/5, and adequate face protection meeting all proper NHRA Specs and requirements. A head sock or skirted helmet required if transmission is located in driver's compartment.
- Arm restraints mandatory
- Valid NHRA competition license mandatory
- Any car with no cross member above drivers legs must have strap or device to prevent legs from projecting outside the chassis.
- Three inch driver restraint system meeting SFI Spec 16.1 mandatory. Restraint system must be updated in two year intervals from date of manufacture.
Fire Control System:
- Fire extinguishing system must meet SFI Spec 17.1. Minimum 5-pound, NHRA accepted fire extinguishing system mandatory. System must be divided with one nozzle on driver's cockpit and one nozzle on engine.
Misc:
- Computers/Data Recorders: May gather data information only, and may not tie to any device that controls specific functions of the car. Ex: shifter/shift solenoids or trans break wiring.
- Warm Ups: Car must be on jackstands and in your specific pit area with someone in the driver's seat when/while the engine is running. No Exceptions
- Taillight: One functioning taillight mandatory.
- Tow Vehicles: As permitted by NHRA or individual tracks.
- Steering: A device must be used to prevent long steering shaft from injuring a driver in case of front impact. If removable steering wheel is used, a commercially available quick release steering wheel adapter meeting SFI Spec 42.1 is mandatory. Gen. Reg. 3:3
- Suspension: Any front suspension using a beam or tube axle must have radius rods attached to frame. Radius rods not mandatory on front axles rigidly mounted 18 inches or less form king pins.
- Wheelie bars are permitted and must be non-metallic.
- Ballast is permitted and must be permanently attached (bolted)
- Ground Clearance: Minimum of 3 inches from front of car (nose included) to 12 inches behind centerline of front axle. 2 inches for remainder of car, except oil pan and/or transmission pan.
- Pinion Support: Mandatory
- Roll Cage / Chassis: Mandatory. Chassis must be inspected every three years by NHRA and have serialized sticker affixed to frame before participation. Chassis must conform to SFI Specs for E.T. car is capable of running. Proper roll cage padding also required by NHRA.
