2011 RULE BOOK
SECTION 10 – TECHNICAL RULES BY DIVISION
10.1 KART CHASSIS SPECIFICATIONS:
10.1.A 2011 WKA Speedway Dirt Series chassis specs as listed in the WKA 2011 Tech Manual should be used as a guideline. Any specific rules listed in the 2011 WVMP rules take precedence over WKA rules. In the event of a rule conflict, WVMP officials reserve the right to make the decision as to whether to impose penalty, request that the part be changed to comply with our interpretation, or to allow the part. In such a case where a conflict may occur, a clarification will be posted in the amendments section of the WVMP rule book. 2011 WKA Tech Manuals are available from WKA, JC Specialty, JRS Kart Parts, or other similar suppliers.
10.1.B TIRES: Must be Burris Dirt Slicks. Any series or compound is acceptable. NO grooving or siping. Grooves from rubbing nerf bars, etc., or tires that were previously siped but have been worn to the point the sipes are barely evident will be allowed at the tech inspectors discretion. IT IS HIGHLY RECOMMENDED IF YOU HAVE SUCH A TIRE THAT YOU GET APPROVAL BEFORE RUNNING IT!
10.1.C BODY: Body may be either a junior or senior body, provided the driver has sufficient visibility when seated in the racing position.
10.1.D Quick release steering hubs may be used in all divisions. Hub may be of bolt on design or welded, and must securely fasten steering wheel to shaft. Any hub not fastened in a manner acceptable to the tech inspector will require replacement.
10.2 CAGED /CHAMP KART CHASSIS SPECIFICATIONS:
10.2.A All caged kart chassis must comply with the WVMP kart chassis specifications in section 10.1 with the exception that they must add a four point cage and safety equipment as included in this section.
10.2.A.1 Caged karts must have a four point cage. Cage should be at least 3” above the top of the driver’s helmet when strapped in car. Main cage must be constructed of tubing with a minimum outside diameter of 1”. Cage may be clamped to frame for easy removal, and should fasten to frame just ahead of rear bumper and from a point falling from just behind front spindle centerline to the front of the frame. Cage MUST be clamped in front. May be clamped or use tubing slid over frame on rear. NO HEIMS may be used for mounting. NO flattening the front down tubes and bolting to the front bumper tab unless a second tab is welded to the frame to form a support on BOTH sides of the cage. Any other mounting method must meet the approval of the tech inspector. Hoops must be connected front and rear. A single support bar should be run along left side of cage. This bar should be a minimum of ¾” in diameter, and may have a ‘slip joint’, at least 3” long, on one end to allow chassis flex. This bar may have a single “bed rail” type hoop on top of it for added protection. This side support must bend outward and follow near the body line to allow sufficient room to prevent the drivers head from striking it in a crash. THIS BAR MAY NOT RUN STRAIGHT FROM THE FRONT HOOP TO THE BACK HOOP AND MUST ALLOW SUFFICIENT HEAD CLEARANCE! Another support bar should be run across rear of cage, approximately shoulder height. This bar should be a minimum of ¾” in diameter, and should be no more than 8” from rear of seat. Shoulder straps should mount here. All tubing must have a minimum wall thickness of .065”. All corners must be bent. No 90 degree cut-and-welded corners. Cage must be constructed of D.O.M. type steel minimum. NO CONDUIT! A headrest within a reasonable distance of the drivers helmet is is highly recommended. A second support bar may be installed on the right side if desired, must meet same requirements as the left side.
10.2.A.2 A racing approved 4 point harness must be used. Webbing must be a minimum of 1 7/8” wide and must be in good, non frayed condition. Whether the condition or age of belts constitutes replacement is at the discretion of the tech inspector.
10.2.A.3 Arm restraints mandatory in all caged classes!
10.2.B ALL YOUTH AND SPORTMAN CAGED KART DIVISIONS MUST HAVE A LOOP STYLE REAR BUMPER THAT IS ROUNDED ON THE ENDS. MAY NOT EXTEND PAST WHEEL EDGE, MUST COVER AT LEAST HALF OF THE REAR TIRE WIDTH.
10.2.C Champ karts will be permitted to run with all caged kart divisions. CHAMP KART CHASSIS MUST COMPLY WITH 2011 WKA CHAMP KART REGULATIONS. We HIGHLY RECOMMEND, though not mandatory, retro-fitting a kart type nose and loop style rear bumper onto the chassis.
10.3.A BRIGGS RAPTOR 5HP ENGINE SPECIFICATIONS
10.3.A.1 Raptor 5HP (Flathead) engine rules will be enforced as written in the Briggs & Stratton Raptor 5hp Stock & General 4 Cycle Notes sections of the 2011 WKA Tech Manual. We cannot print the WKA Rules due to copyright laws. Do not ask. Racers wishing to view them must purchase a WKA 2011 Rule Book.
10.3.A.2 Youth divisions must run designated restrictor plate and weight as listed in the divisions section.
10.3.B BRIGGS ANIMAL ENGINE SPECIFICATIONS
10.3.B.1 Animal engine rules will be enforced as written in the Briggs & Stratton Stock Animal & General 4 Cycle Notes sections of the 2011 WKA Tech Manual. We cannot print the WKA Rules due to copyright laws. Do not ask. Racers wishing to view them must purchase a WKA 2011 Rule Book.
10.3.B.2 Youth divisions must run designated restrictor plate and weight as listed in the divisions section.
10.3.C WVMP SEALED CLONE ENGINE SPECIFICATIONS
10.3.C.1 The intent of the WVMP sealed clone classes is to provide a low cost out “out of the box” engine package for the beginner or budget minded kart racer. Because of the multiple clone engine manufacturers, the extensive variations in quality control among them, the influx of aftermarket parts, and the costs beginning to arise through the purchasing of “builder prepared” engines, WVMP has instituted the sealed engines beginning in 2011 for the sportsman and sportskids classes. The engines are purchased by WVMP and sealed by the track officials before being sold. They come ready to race with no governor and no low oil sensor. The side covers, cylinder heads, and flywheel covers are all sealed to prevent tampering. This should ensure a level playing field and a low cost option for the racers. The rules are very clear, and the penalties very stiff. IF YOU ARE NOT CAPABLE OF BUYING AN ENGINE AND LEAVING IT ALONE, THE STOCK APPEARING CLASS IS FOR YOU!
10.3.C.2 Engine cost: The WVMP sealed engines are available directly through WVMP. For the racers convenience, they are also available through JRS Kart Parts. The price of the engines is $150 plus sales tax ($159 total). All engines serial numbers and the seal numbers and locations are recorded prior to sale. The engines MUST be run as purchased unless otherwise stated in this section.
10.3.C.3 Exhaust System: Any single stage, one piece header made from .750” O.D. Steel tubing with a maximum I.D. Dimension of .635” allowed. Must have a Briggs #89966 tube type muffer, it's aftermarket equivalent, or an RLV #4117 muffler installed at the end of the header. Muffler may be welded to header or threaded into a welded on coupler. If threaded, it may have a spot weld to keep it from vibrating loose. Header must have a minimum length of 10”, maximum length of 14”, INLUDING MUFFLER! To be measured from engine mounting flange to tip of muffler, following along the outside radius of the longest bend. Muffler must remain stock as produced. Tack welds to prevent “shell” from blowing apart are permitted. Header MUST be heat wrapped from flange to start of muffler. Muffler MAY NOT be wrapped. Brackets to reduce vibration/breakage HIGHLY RECOMMENDED. Any aspect of the exhaust not compliant will result in disqualification with the following exception: If a tube type muffler is found with the internal baffle plug missing post-race, that car will be penalized to last place in that event. The same will apply for the RLV muffler if the “screen” in the end of the muffler has blown out.
10.3.C.4 Carburetor: Huayi type carb only. Choke assembly must be in place and functional, but may be fastened in the open position. Choke bore .810” dia max, venturi .615” max and throttle bore .751” max. NO MACHINING OF CARB BORE. Stock butterfly and screws must be used and unaltered. Plastic spacer behind carb must be used and unaltered. Main metering jet, idle jet, and emulsion tube are non-tech. Throttle linkage non tech.
10.3.C.5 Aftermarket air filter adapter allowed. Maximum length 1.375”. Air filter non tech.
10.3.C.6 Fuel Tank: Remote/floor mounted tank MUST be used. Any pulse type fuel pump permitted. MUST be pulsed from the valve cover.
10.3.C.7 Fuel: Gasoline only. No exotic fuels or additives. Pump around system may be used at track's discretion.
10.3.C.8 Valve Train: OEM push rods, push rod guide plates, retainers, keepers, adjusters, and stock 1:1 ratio OEM rocker arms only. Valve springs may be changed, but must meet the following specs:
Maximum spring diameter - .798”
Maximum wire diameter - .073”
Maximum tension - 10.8 lbs at installed height of .850”, to be tested with AKRA certified tester.
10.3.C.9 Fasteners: Non-tech, but must retain their original factory size. Heli-coils, studs, etc allowed for repair purposes.
10.3.C.10 Gaskets & Sealer: Gaskets must be of stock type and material (paper or graphite). NO aluminum gaskets or copper gaskets on exhaust or intake side of engine. NO spacers. One gasket per mating surface only. Silicone may be used.
10.3.C.11 Crankcase breathers are to be routed internally through the valve cover as originally intended in OEM configuration. No additional breathers allowed.
10.3.C.12 Pull Starter: The pull starter mandatory and must be in place anytime the kart is on the track. Starter may be removed for cleaning, “clocking”, or rope replacement.
10.3.C.13 Sealed Clone “Swap” Rule: No teams may claim engines. If the track feels a driver may have ended up with an “over competitive” engine, they may confiscate that driver's engine following the feature on any given night. That racer must go directly to the tech area and remove the engine. The engine must be given to the track officials as it is purchased from WVMP (complete long block – racer keeps throttle linkage, air filter and adapter, header, muffler, bracket, chain guard, clutch and key, top plate, fuel pump and hoses, breather hose, motor plate. The racer will be given a “loaner” engine to use for 1 race (this engine may be a used track rental engine or a brand new sealed engine at the tracks discretion). During this time, their engine will be checked for tampering and legality. Following the 1 race with the loaner motor, the track will make the decision whether to return the engine, extend the swap, or make the swap permanent. In other words, you are racing for your engine back... if you run at a level of competitiveness that you had been with your motor with the track engine, then it is most likely not the engine and you will probably get yours back. If not, then the engine may be “over competitive”. It will most likely then be taken and run on a dyno to compare with another track owned engine. If a large difference is seen, then the engine may very likely be deemed unfit for use and disassembled. In this case, the swap will become permanent. If the engine is comparable to the track owned engine or others tested in the past, it may be returned to the racer and the loaner engine returned to the track.
10.3.C.14 Anyone refusing to surrender their engine will be banned from the sealed engine divisions permanently. The engine in question will also be deemed illegal and banned from competition in the sealed engine divisions.
10.3.C.15 Any engine “swapped out” by the track and found to have been tampered with, either the seals or any parts, will result in the racer being fined all points earned in the division that season and banned from the sealed engine divisions permanently. In the event that two drivers share a kart, BOTH drivers will be penalized.
10.3.C.16 Seals may not be removed or tampered with in any way. Any engine with seals in question will be immediately subject to the track claim.
10.3.C.17 Parts inside the sealed components (flywheel cover, side cover, cylinder head) may not be removed, machined, changed, or tampered with in any way. If any engine is in need of repairs in these areas, it must be returned to WVMP to be repaired and re-sealed. A list of such repairs and the flat rate prices will be posted on the track website.
10.3.C.18 Stock kill switch must be functional and in stock location.
10.3.C.19 Clutch: Stamped steel drum type clutch only. Two shoes maximum. No machined drums. Parts must remain as produced, no machining. Springs may be changed to adjust engagement. NO DISC CLUTCHES.
10.3.D WVMP STOCK APPEARING CLONE ENGINE SPECIFICATIONS
Any 6.5hp “Clone” engine may be used.
Must begin with stock block/side cover. All internal
modifications allowed.
“Patch” may be welded onto block for hole repair from rod damage. NO external modifications with the following exceptions:
1) Hole for governor rod may be tapped and plugged.
2) Low oil sensor hole may be plugged.
3) Hole may be drilled and tapped for pulsing of fuel pump
10.3.D.3 Must begin with stock cylinder head casting. No visible external modifications. All internal machining, porting, polishing, and modifications allowed.
10.3.D.4 Connecting rod: Billet rod mandatory. Any manufacturer. Must be used as manufactured, unaltered.
10.3.D.5 Piston & Rings: Non-tech.
10.3.D.6 Flywheel: Billet flywheel mandatory. Any manufacturer. Must be used as manufactured, unaltered.
10.3.D.7 Flywheel fan non-tech.
10.3.D.8 Stock type coil must be used. Timing non-tech.
10.3.D.9 Camshaft and Valve Train non-tech. Stock valve cover must be used unaltered with the exception of drilling and tapping to pulse fuel pump. No spacers underneath. 1 gasket only.
10.3.D.10 Carb: Stock Huayi type carb casting must be used. No external modifications allowed with the exception of throttle linkage modifications. All internal modifications allowed. Emulsion tube, idle and main jets non-tech.
10.3.D.11 Air Filter & Adapter: Non-Tech
10.3.D.12 Starter recoil: Non-Tech
10.3.D.13 Header: Non-Tech. Must be wrapped.
10.3.D.14 Muffler: RLV Muffler used in the WKA stock raptor and animal classes mandatory, must be unaltered.
10.3.D.15 Fuel: MUST run methanol. No additives or exotic fuels. Pump around may be used at track's discretion.
10.3.D.16 Fuel Tank/Pump: Remote fuel tank mandatory. Fuel pump may be pulsed from valve cover, side cover, or crankcase.
10.3.D.17 Breather: Non-Tech
10.3.D.18 Clutch: Disc type clutch allowed. No wet clutches.
10.4 JR./SR. SLINGSHOTS
All Speedway Entertainment Slingshot rules apply unless exception is listed.
10.4.A Jr. Slingshot must run 1 bbl. Carb.
10.4.B Jr. Slingshot ages are 8 thru 13
10.4.C Older body styles may still be run provided it is a past SE body. NO CUSTOM OR HOME MADE BODIES!
10.4.C.1 Body must be 2008 style or newer for all SE Tour Events.
10.5 270cc Microsprints
10.5.1 All cars should be constructed to look like microsprints. All cars must be equipped with complete body panels (hood, tail, side panels, belly pan, etc.)
10.5.2 Roll cages must be constructed of 4130 chrome moly tubing. Minimum diameter 1 ¼” OD, .065” wall thickness OR 1” OD .083” wall thickness.
10.5.3 Belly pan must extend from the front of the seat to the nose of the car.
10.5.4 All steering and suspension parts that are bolted together must use locking nuts, safety wire, or cotter pins.
10.5.5 All cars must be equipped with nerf bars extending to at least the inside edge of the front tire and middle of the rear tire. May not extend beyond the outside of the tread width of any tire.
10.5.6 No centrifugal clutches or belt drives.
10.5.7 4 point racing harness mandatory, minimum width of 2 ½”. May not be more than 5 years old as of first race of the season.
10.5.8 With driver seated in car, there must be a minimum of 3" of clearance between the driver's helmet and the upper roll bar.
10.5.9 Brakes must be of sufficient strength as to stop the wheels in the pits or stop the car while in motion on the track.
10.5.10 Car must be equipped with a fuel shutoff valve and kill switch. Both must be functional, within reach of the driver, and clearly marked.
10.5.11 Sharp pointed objects will not be tolerated. Rear axles may not extend past the outer bead of the rear wheels when checked with a straight edge.
10.5.12 Radiators should be mounted in a manner that makes it highly unlikely that it will be contacted by another car.
10.5.13 Steering mechanism must be constructed of a minimum of 5/8” rod and 3/8” heims.
10.5.14 Cars must have front and rear bumpers. Rear bumper must be suitable for push start. Track not responsible for car damage due to push starting or pushing/removing from track.
10.5.15 Wheelbase - 56” minimum, 72” maximum.
10.5.16 Overall width - Shall not exceed 59” sidewall to sidewall.
10.5.17 All wheels must be race approved, 8 or 10 inch diameter only.
10.5.18 Engine Specs: Any single cylinder 250cc full production engine. Maximum of 271cc permitted. No forced air induction or fuel injection. Any height compression head is legal. Gas or alcohol only! No additives other than top end lube.
10.5.19 Sprint car type window net RECOMMENDED on left side of the cage.
10.5.20 Torque arm must be secured by a minimum ¼” cable or chain, or other reasonable safety device.
10.5.21 Welded Spindles must have skid plates
10.5.22 All cars must start the race with a top wing. Must be securely fastened. If damaged during race, car may continue provided it is still reasonably secure or pit and have it removed. They may continue provided the remaining brackets are not deemed a hazard by track personnel.
10.5.23 Top wing may not exceed 12 sq. ft. Side panels must not obstruct the view of the driver and cannot extend past the center section by more than 10 inches, front or back. 24” x 54” side panel maximum.
10.5.24 Nose wings allowed. Maximum size 28" x 18". Must not mount forward of front bumper.
10.5.25 QUIET PIPES ARE REQUESTED IF YOU HAVE ONE! If noise becomes an issue with the township, they will become MANDATORY!
10.5.26 All added weights must be painted white with car number clearly marked on it. Weights must be securely fastened with locknuts, double nutted, or must be drilled and secured with a cotter key.
10.5.27 A 450cc 4-Stroke engine may compete in the 270cc Microsprint division. All chassis/weight rules will remain the same regardless of engine. May be converted to alcohol. If running gas, MUST have a tank bladder.
10.5.27.A MUST retain stock stroke.
10.5.27.B Boring permitted.
10.5.27.C NO injection. Carb only.
10.5.27.D Clutch may be removed.
10.5.27.E MUST HAVE MUFFLER!
10.5.27.F Racer must have a manual for the engine they are running for informational purposes.
10.5.27.G It is our hope that by allowing the 450's to compete, that we will be better prepared for the future in regards to this division. We reserve the right to make any rule amendments we deem necessary to maintain a level playing field.
10.6 600cc Microsprints
10.6.1 All cars should be constructed to look like microsprints. All cars must be equipped with complete body panels (hood, tail, side panels, belly pan, etc.)
10.6.2 Roll cages must be of a 6 point design. Main cage must be 1.25” tubing (.065” wall if using chrome moly, .120” wall if using mild steel). All bends must be made of a 3” minimum radius (no square or pointed corners allowed).
10.6.3 Kill Switch – MANDATORY, must be within reach of driver. Preferred location is on the right side of dash. Should be visible to safety crews and clearly labeled.
10.6.4 Belly pan must extend from the front of the seat to the nose of the car.
10.6.5 Fuel bladder or sprint type fuel cell MANDATORY. Must be fully protected and securely mounted. Must be separate from the drivers compartment. No pressurized fuel systems.
10.6.7 All steering and suspension parts that are bolted together must use locking nuts, safety wire, or cotter pins.
10.6.8 All cars must be equipped with nerf bars extending to at least the inside edge of the front tire and middle of the rear tire. May not extend beyond the outside of the tread width of any tire. Minimum diameter ¾” O.D., .065” wall mild steel. No sharp or pointed edges.
10.6.9 Bumpers – Must be present front and rear. Must be securely attached and suitable for towing. Width may not extend past outside of main frame rail
10.6.10 Must be chain drive. No centrifugal clutches or belt drives. No shaft drive.
10.6.11 5 point racing harness mandatory, minimum width of 2 ½”. May not be more than 5 years old as of first race of the season.
10.6.12 With driver seated in car, the driver's helmet may not be higher than the bottom of the upper roll bar.
10.6.13 Brakes must be of hydraulic type and sufficient strength as to stop the wheels in the pits or stop the car while in motion on the track. Must have brakes on the rear axle. Front wheel brakes optional.
10.6.14 Car must be equipped with a fuel shutoff valve and kill switch. Both must be functional, within reach of the driver, and clearly marked.
10.6.15 Throttle must be foot operated. Return strap highly recommended. 10.6.16 NO electronic traction control devices permitted.
10.6.17 Radiators/oil coolers should be mounted in a manner that makes it highly unlikely that it will be contacted by another car. May NOT be mounted in drivers compartment.
10.6.18 No sail panels allowed on any part of car, including sidebars. Side panels may not protrude more than 2 inches behind rear down tubes.
10.6.19 Sides of chassis must have panels installed. Must have sprint type tail tank. Must run sprint or modified style hood.
10.6.20 Screen over windshield area highly recommended.
10.6.21 Suspension on all 4 wheels. May be of coil over, torsion bar, or leaf spring design.
10.6.22 Steering mechanism must be constructed of a minimum of 5/8” rod and 3/8” heims. Steering wheel hub must be of quick release or pin style.
10.6.23 All radius tubes should be a minimum of 9/16” diameter with a wall thickness of .120”.
10.6.24 Wheelbase - 50” minimum, 72” maximum.
10.6.25 Overall width - Shall remain between 58"-65" sidewall to sidewall. 10.6.26 All wheels must be race approved, 10 inch diameter only. Steel, aluminum, or carbon fiber wheels are acceptable. Beadlocks recommended.
10.6.27 One piece live rear axle only. No quickchange or differential type rear ends. No accessories (hubs, sprocket, etc.) may be welded to the axle. Nut or snap ring must be present at end of axle to prevent wheels from coming off. End of axle may not protrude beyond outer wheel bead when checked with a straight edge.
10.6.28 A firewall must separate driver from engine compartment.
10.6.29 All bolts should be grade 5 minimum and should use locknuts, lock washers, or be safety wired or cotter keyed.
10.6.30 Sprint car type window net RECOMMENDED on left side of the cage.
10.6.31 Torque arm must be secured by a minimum ¼” cable or chain, or other reasonable safety device.
10.6.32 All cars must have a top wing at all times. Must be securely fastened. If damaged during race, car may continue provided it is still reasonable secure. NO CARS WILL COMPETE WITHOUT TOP WING! A driver damaging a wing prior to the feature MAY, at the track's discretion, be allowed to start in the rear to earn starting points and money. They will be asked to complete 1 lap and exit the speedway to avoid effecting the outcome of the race. Center air foil can not exceed 12 sq. ft. (1728 sq. in.) of surface area. Surface area is defined by the length x width of the flat plane of the largest projection of the center foil. Must not extend beyond outside of rear tires or behind the rear bumper. Center foil must be square or rectangular in shape with all 4 corners set to 90 degree angles. Center foil must be one piece. No split or bi-wings permitted. Maximum dimension of each side panel is 54-1/4” x 24-1/4”. Only two side panels allowed. No
kick-out allowed. Panels must be parallel. Maximum of 2” deep side panel, this is the protrusion of the stiffening members not including the struts (tubular or flat bar bracing).
10.6.33 2. Nose Wing: A nose wing is optional. Center air foil can not exceed 4 sq. ft. (576 sq. in.) of surface area. Surface area is defined by the length x width of the flat plane of the largest projection of the center foil. Nose wing must not extend beyond the outside of the front tires., or beyond the front bumper. Center foil must be one piece. No split or bi-wings permitted. Maximum dimensions of each side panel is 10-1/4” x 24-1/4”. Only two side panels allowed. Panels must be parallel. No kick-out allowed. Maximum of 2” deep side panel, this is the
protrusion of the stiffening members not including the struts (tubular or flat bar bracing).
10.6.34 Wet cell battery mounted in the cockpit must be covered and vented.
10.6.35 All added weights must be painted white with car number clearly marked on it. Weights must be securely fastened with locknuts, or must be drilled and secured with a cotter key.
Engine Rules: WVMP will be running under the 600cc Micro Sprint Universal Engine Rules.
10.7 Stage 1 Modifieds
10.7.1 Stage One Modified rules will be set and enforced by Richie Smith.
(For information, contact Richie Smith @ 610-462-4302)
