2008 Double Barrel Sprint Car Series Rules
 

ROLL CAGE:
1. The roll cage must extend above the drivers head with helmet on.
2. Complete firewalls are MANDATORY between the driver and the engine.
3. NO aluminum frames allowed. A minimum of .120" wall is highly recommended on the frame and cage.

SAFETY:
1. Mandatory head rest with roll bar padding.
2. Seats should be mounted securely to the roll cage or the frame in an approved manner.
3. Angle toe MANDATORY (Toe loop on the throttle)
4. Rock screens are highly recommended in front of the drivers face area.
5. Steel brake lines highly recommended.
6. Helmets are required and must be SA 95, or SA 2000 full coverage and should be worn at all times when the car is in motion, and must be present at inspection.
7. Arm restraints and Neck Brace required. (Hans or Hutchins Device may substitute neck brace)
8. A driving suit of a flame-retardant nature (Nomex-type material) must be worn by all competitors. If the driving suit is two piece both the top and bottom must be worn at the same time. It is recommended that there be a one piece , minimum three layer quilted suit of fire resistant material and underwear, socks, shoes, gloves and hood of fire resistant material.
9. A competition shoulder harness, at least 3" wide, and a lap belt at least 3" wide are required. Metal to Metal Buckles are required on the shoulder harness and lap belt. The harness must be mounted in at least 5 points below the drivers shoulders (sub strap). Belts and Harness cannot be over 2 years old.
10. A kill switch is required and must within easy reach of the belted in driver. The switch must clearly be marked ON - OFF.
11. Nylon safety strap on the Torque tube is Mandatory.
12. It is Mandatory that all cars must be equipped with a quick disconnect steering wheel.

BODY - WINGS: (Jackson Speedway will follow the current World of Outlaw rules.)
1. Maximum of 31 square feet overall may be used. Top wing not to exceed 25 square feet and is not to extend outside the wheels. Front nose wings may not exceed 2' x 3' with 12" side boards.
2. Side boards of 30 inches high, 72 inches wide, with not more than 1 1/4" lip on the top or bottom edges. There is to be no more than a 2" lip on the rear of the sideboard. No more than a 2 1/2" banana in the wing.
3. No wicker bill allowed.
4. Hydraulic Wing Sliders not allowed.
5. Aluminum wings only.
6. NO BI-WINGS.

CHASSIS AND WHEEL BASE:
1. Upright sprints only, with an 83 inch wheelbase minimum.

SUSPENSION - FRONT AND REAR:
1. All winged and non-winged cars must weigh a minimum of 1575 pounds with the driver after the race. Weight must be placed between the frame rails.
2. No manual, driver, computer, electronic (while racing) adjustable systems such as traction controls, chassis adjusting systems, etc. with the exception of wing valves.

TIRES:
1. Tires - Right Rear Tire will be the SP-2 or Sp-3, and the SC-25 when implemented. Open Left Rear.
2. Wheels - Any approved racing wheels may be used.

ENGINE:
1. Blocks, GM 305 V8's w/approved casting #'s - 355909, 361979, 460776, 460777, 460778, 10049047, 14010201, 14010202, 14010203, 14010231, 14016381, 14016383, 14088551, 14102058.
2. MAXIMUM CUBIC INCH "317" NO TOLERANCE. Stroke 3.480 +/- .020". Max Bore 3.801".
3. Flat top pistons with valve relief, can not protrude above cylinder bore.
4. Crank, Iron or Steel, minimum weight 48lbs. 1% tolerance, minimum main bearing diameter 2.450" - .030"
5. 5.7" steel rods, minimum rod journal diameter 2.100" - .030". Oil pan inspection hole required to view rods.
6. No cam gear or belt drives. Roller chain OK. No device to vary running cam or ignition timing.
7. Steel hub or damper. Stock location water pump.
8. Flat tappets, stock diameter (.842") tappets. NO roller, hydraulic, mushroom or radius tappets allowed.
9. No hard face overlay cams. original cam configuration and firing order (18436572).
10. Stock diameter valve springs, maximum OD 1.265".
11. Wet sump, internal pump only, no crankcase vacuum systems.
12. Roller rockers allowed, NO shaft systems. 3/8" stud mount rockers only. 1.5 ratio only.
13. 3/8" Stud Girdles allowed
14. No repositioning, boring or bushing of cam or lifter bores. Exception for lifter bore repair, only with prior tech approval. Maximum Cam diameter 1.869" +.002"
15. Valves, Intake 1.940", Exhaust 1.500", stem 11/32". Original length and weight, no altered or hollow stems.
16. Steel only: Valve retainers, Keepers, Push Rods, Springs, Tappets, Crank, Rods, Wrist Pins, Fasteners and Main Caps. NO titanium, composites, or ceramics in engine.
17. Ignition: Must have Magnetos with mechanical contact points.
18. Carburetion: 1` - 500 CFM Holley 2Brl Part # 4412 with 1 11/16" maximum throttle bores. No thinning of throttle shafts. No grinding or polishing of Venturi. Venturi will be gauged, with a gauge that measures 1.379. Casting Line must be visible. Booster must retain stock holley height and dimensions. After-market billet metering blocks allowed. Chokes may be removed but must retain air horn.
19. Carb Adapter plate: Any Carb Adaptor plate may be used but must not exceed 1 3/8" thick with gaskets.
20. Heads: World Torquer 305 Part # 042650. Max valve size - Intake 1.940", Exhaust 1.500". Absolutely no grinding, porting, polishing, acid etching, shot peening, or adding of materials allowed. No enlarging of bowls, valve job may have multiple angles but may not extend more than .250" below the top of the 45 degree seat.
21. Intake: Weiand Team G Part # 7530. No porting, polishing, grinding or adding material allowed.
22. Compression: 10.3 to 1 MAXIMUM as measured by the whistler.
23. Mufflers are required.  In 2009 the Double Barrels will switch to the Schoenfeld #112535.

FUEL:
1. Fuel bladders in fuel tank are Mandatory.
2. Methanol and Ethanol allowed.
3. No Nitro, Nitrous Oxide or Nitrous devices allowed. No Methane or Propolene oxide or other fuel additives allowed.
4. Wolfie valve or similar automatic fuel shut off recommended.

DRIVER OR ENGINE CHANGES:
1. No driver or car changes are allowed after the heat races.
2. The driver may qualify only one car in a class. In the event of a wreck in practice, the driver will be allowed to qualify another car provided that, that car has not yet been qualified.
3. If a driver changes motors between the qualifying event and the next event, he or she will have to start in the rear. This rule will be exempt for multiple day events.

POST - RACE SCALING:
1. The top 4 race cars in the feature must report to the tech area to be weighed, and teched.
The only exception to this, will be the winner of the feature race should stop and receive his or her trophy presentation immediately after the race. The car still needs to weighed, and pass any other post race inspections. The car, while in victory lane will be monitored by track officials and then escorted back to the tech area. If the car goes directly to the tech area, we will skip the trophy presentation.
Any top four finishing driver that:
A. Does not go directly to the tech area, or
B. Does not remain in the tech area, until scaled and completed tech.
C. Does not meet the minimum weight according to the scale at the track

Will be disqualified, and will forfeit all points and prize money for the Night.

TECH PROCEDURE:
2/25/2007 - we hope to have the sealing procedures updated in the next week or so.
1. All engines must be sealed before they are allowed to race. The engine must be drilled for sealing wire on 2 - adjacent head bolts on each head, 2 - intake bolts and 2 timing cover bolts. If seals have been broken those areas effected must be dismantled, re-inspected and re-sealed prior to racing.
2. All engines will be initially Teched at the beginning of the year prior to the first race. Engine should have the pan removed, timing cover removed, heads, intake and carburetor removed. Inspection will take approximately 2-hours. Once inspection is complete you will be required to install the heads, intake and timing cover for sealing. Contact Bill Diekman for Appointment or tech questions: 1-507-235-6326.
3. Tech inspections can take place at any time, including the beginning of the year, or any time thereafter.
4. For a Fee ($50 with-in 30 miles of Jackson plus $1 per mile above 30 miles) arrangements can be made, by appointment, for an inspection and sealing at your engine builders shop or at your shop. Make check payable to Bill Diekman. The fee is to cover his time and traveling costs. 5. Obviously some items will need to be teched race night.

PROTEST PROCEDURE:
1. 1 - Protest per car per night. Only driver can protest. Must Be specific on component being protested (i.e. Rods - Pistons - Crank, Valve Train, Heads, Carb. etc.).
2. Protest Fee - $100.00.
3. After the feature race, Jackson Speedway reserves the right to tear down the engine of ANY race car. This reserved tear down right is separate and distinct from any inspection to which any car is subject to.
4. After the Feature race, a track official will notify the driver, of that feature race, that his race car has been protested. The protested driver shall then proceed to the area designated for teardown and inspection pursuant to a protest. Track officials will then proceed to tear down the protested engine according to what was protested.
5. A tear down shall consist of the disassembly of the upper end, or lower end of the engine. An upper end tear down includes, but is not limited to, the removal of the Carburetor, spacer plates or adaptors, valve covers, intake manifold, headers, valve train components and heads. A lower end tear down includes, but is not limited to, removal of oil pan, crankshaft, rods and pistons.
6. Only Track officials, the driver and one representative from that car will be allowed in the designated tear down area.
7. The Tech inspector has the final word on the legality of the race cars involved in the protest.

ILLEGAL PARTS PROCEDURE:
This procedure has been reviewed by the racing committee, as of 6/7/2005. If any illegal parts are found, the driver will be disqualified, lose all points and money for the evening, and be fined $100 for the 1st offense. The second offense for the same infraction will result in a $500 fine, and loss of all points and money for the evening.

Since this is a beginner class, the driver and car cannot run the Double Barreled Sprint Car Series and the Championship 360 Sprint Cars on the same night.