2020 Owosso Speedway Modified Class Rules

Owosso Speedway reserves the right to amend these rules at any time Page 1 of 9

AllcompetingModifiedDriverswillberequiredtouseaHead&NeckRestraintSystem.ThiswillberequiredforanyModifiedcarenteringthetrackatanytime,includingpractice!Carsthatarecompetingusinga“BirdCage”typerearendmusthavea1/8“thicksteelplateweldedorsecurelyboltedtotherollcagebehindtheseat.Theplatemustextendinwidthfromthedoorbarsto3”pasttheseatandinheightfromthetopoftheseattothefloor.Ifthecarisconstructedwithan“X”or“Z”barbehindthedriver’shead,thentheplatemustextendfromthatpointtothefloorofthecar.“Lead”willbetheonlyappropriateballastmaterial.Allothertypesincludingtungsten,cement,asphaltoracombinationofproductswillbedisallowed.PleasenoteontheFrontSuspensionthatONLYtheUPPER“A”framecanbemovedfromtheStockLocation.TheLowerorBottom“A”FrameMUSTbeintheOEMlocationusingtheFactoryboltholes.Pleasecheckyourfrontsuspensiontomakesurethatitisright!ThisruleexpandstoincludeNObushingsofanykindormaterialtobeusedattheLower”A”FrameOEMmountingpoints!TheLower“A”Framescannotbemoved,orAdjusted!TheWeightforourModifiedshasbeenchangedto:2400lbswithaminimumrightsideweightof1000lbs.

2020 Owosso Speedway Modified Class Rules

Owosso Speedway reserves the right to amend these rules at any time Page 2 of 9

3.42”

2020 Owosso Speedway Modified Class Rules

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2020 Owosso Speedway Modified Class Rules

Owosso Speedway reserves the right to amend these rules at any time Page 4 of 9

2020 Owosso Speedway Modified Class Rules

Owosso Speedway reserves the right to amend these rules at any time Page 5 of 9

*SpoilerMeasurements–4”x66”–(264sqinches)

-4.75”x56”–(264sqinches)3.Allcarsmustbenumberedwithlarge,legiblenumbersondoors,roofandbackpanel.Lettersondoorsofcarmustbeincontrastingcolorfrombody.Theymustbeatleast4” thickandatleast20” high.Roofnumbermustbeatleast20” heightand4” thick.Allnumbersmustbelegiblefromscoringtower.4.Sponsor’snamesmustnotinterferewithcarnumberandmustbeneatlylettered.5.Enginecompartmentwillremainopen,nosidepanels,hoodsidesmayhaveamax.4” dropandmustbeenclosedatrearofhood.Maximumhoodscoopheightis6”.Bodiesmustextendnofurtherforwardthatbackofblock.Passengersideofbodymustbenofurtherforwardthanrearofblock.Backpaneltobesolidandatleast8” high.Nopanelinfrontofrightdoortoenginecompartment.Noinnerpanels.

2020 Owosso Speedway Modified Class Rules

Owosso Speedway reserves the right to amend these rules at any time Page 6 of 9

6.Interiordecksurfacewillbeflushwithdoorsand¼panels.Driverandpassengersidewindowsonbothsidesofcarmusthaveatleast12” verticalopening.Leftsidewindownetisrequired.Windownettobemountedsolatchisattopfrontofdriversidewindow.7.Nocarcoversorcoversonsuspensionparts,partialorcomplete.RULESASPOSTEDONTHEOWOSSOSPEEDWAYWEBSITEWILLBECONSIDEREDTOBETHECURRENTANDOFFICIALRULES.*Originalrooflineofvehiclemustbemaintained.Mustbefullsize.NOFLATROOFS.NoVerticalsofanysort.Nowingsoranyothergroundeffectsareallowedanywhereoutsideorinsidecar.Sailpanelsmustcloselyresembleexamplesshownonbodydiagram.Anyreinforcinglipsonrearofsailpanelsmustbe180degreebendsandmustbeequaldistancefrontandreartotheoutsideofthebodyandbenomorethan2” infromoutsideofrearfenders.Spoilersallowed.BRAKES:1.Mustbeoperatedonallfourwheelsandmustlockupallfourwheelsduringinspection.2.Nobrakeshut-offdevicesallowed.3.Proportioningvalveallowed,fronttorearonly.4.CastIronOEMCalipersonly.Rotorsmaynotbelightenedordrilled,exceptforhubboltpatternorlargerstuds.5.Onepiecefronthubandrotor.Nobilletcomponents.Stocktyperotor.BUMPERS:1.Bumpersmustbeusedbothfrontandrear.Two-barfrontbumpersmustbemountedframeendtoframeendwiththebarsequallengthoffframerail.Bothmustbemadeofminimum1.25inchroundtubingandmax1.75inchtubingandmustbeabletosupportcarifliftedbywrecker.2.RearBumpersmustbebentforwardascloseto90degreesaspossibleandbenomorethan2” outsideofbodyincludingnerfbarandresembleexampleonbodydiagrampage.Mustcontainnosharp edges. 3.Rearbumpermustbeconstructedofroundtubingonly;perillustration,andmustprotectfuelcell.STRAIGHTENDSNOMORETHAN4” OUTSIDEOFFRAME.Centerofbumper,frontandrear,mustbe18" +-2" fromground. CARBURETOR:1.Onetwooronefourbarrelcarburetorokay.Mustbenaturallyaspirated.2.NOfuelinjection.NOelectricfuelpumps.DRIVESHAFT:1.Driveshafthoopisrequiredandmustbeconstructedofatleast.25-inchby2” steelandmustbemountednomorethan6” backfromfrontofdriveshaft.2.Driveshaftmustbepaintedwhite.3.SteeldriveshaftsONLY.ELECTRICAL:1.Allvehiclesmusthavethecapabilityofstartingwithoutbeingpushedorpulled.Allcarsmustjoinlineupondemand,unaided,orgototherear.Batterydisconnectswitchmustbelocatedondeckonrighthandside,andmustbeabletobereachedbydriverandsafetycreweasily.2.EngineKillswitchrequiredwithineasyreachofdriver.ThisswitchMUSTbeclearlymarked―offand―on.3.NOtransmittingorlisteningdevicesincar.NOelectronicmonitoringcomputerdevicescapableofstoringortransmittinginformationexcepttachometersallowedoncars.NotractioncontroldevicesofanykindPenaltyissuspension.Nolaptimingdevicesallowedduringracing.Mustbevisiblydisabledbeforeenteringthetrackforcompetitionstyleevent.ENGINE:1.Noaluminumblocks.2.AnyAmericanmakeenginemaybeusedaslongasrearofengine(bellhousingflange)ismountedatleast72" forwardfromthecenterlineofrearaxle.Engineoffsetmustbekeptwithin2" ofcenterlineoffrontcrossmember.Engineheightminimumwillbe11" fromgroundtofrontcenterofcrankshaft.3.Allenginesusedincompetitionmustbeabletobeusedinconventionalpassengercarwithoutalterations.Motormountcastingscannotberemovedoraltered.Blockcastingsandfittingsmustnotbechanged.NOmagnetos.

2020 Owosso Speedway Modified Class Rules

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4.NoCOMPLETELYdrysump systemsallowed.SingleStageexternaloilpumpsareallowedwithanoilpanattachedtothebottomoftheengine.Noexternaloiltanks!5.Coolingsystemmaybemodified.Mustbeventedintocatchcanaheadoftransmissiontailshaft.NOANTIFREEZEALLOWED.Radiatorsandoilcoolersmustnotprotrudeaboveinterior.EXHAUST:MufflersMandatory–97DECIBELSMAX-NOTOLERANCE.Intheinterestofdriversafety,exhausttailpipelocationislefttodriverdiscretion.Carsexceedingdecibellimitwillnotcompete.Nopartoftheexhaustsystemmaypassthroughdriver’scompartment.FRAMEHEIGHT:4" min.FRAMES:1.Factoryproductioncompleteframe1970ornewerparallelAmericanpassengercarframesonly.Framesmaybecutinrearonlyatpointnotfurtherthan36” fromcenterofrearendhousing.Driver’sseatandalldrivercontrolsmustremainwithintheconfinesofthefactorycarframe.Nofrontclipsortubetypeallowed.2.Leftframerail,ifaltered,mustbereinforcedwithminimumof2” x2”,.095stockonlyandmustbeabletosupportrollcageonbothsides.Mustbefull&completebothsides.Frontcrossmembermaybenotchedforradiatorand/orsteeringclearanceonly.Minimumframe&bodyheightfromgroundis4”WITHDRIVER&EQUIPMENTINCAR.(Exceptionisfrontcrossmember).3.FrontsuspensionmustbeunalteredO.E.M.andbeinstocklocation,andmustbereplaceablebystockpartfromsametypesuspension.HoweOEMreplacementfabricatedmodifiedfrontclipwillbeallowed,mustadd60lbs.total,30lbs.toeachframerailinthedesignatedareamakingthisfabricatedfrontclipthesameweightasaOEMfrontclip.CastIronspindlesonly,nofabricatedspindles.Noaluminumorfiberglasssuspensionorrearendpartsallowed.Bottom“A”Framescannotbemoved.FrontswaybarandsuspensionmustbeO.E.M.style.Noaluminumspindlesareallowed.4.SteeringboxmustbeO.E.M.andmustremainwithinoriginalboltpatternfortypeofframeused.Heimjointallowedreplacingtierodends.Steelnon-O.E.M.draglinkandpitmanarmisallowed.Norack&pinionallowed.5.AftermarketTubularreplacement“A”framesallowed.MustmeetOEMspecsexactly.Lowersmustbeinstocklocation.Uppersmayberelocated.Non-OEMballjointsallowed.Monoballbushings/steelallowedinplaceofrubber.6.NoJeep,Bronco,etc.,or4-wheeldriveframesallowed.Nosportscarframesallowed.Nofrontwheeldriveallowed.7.Rearofframemaybealteredtoacceptleaforcoilsprings.Steelspringsonly.Coiloversallowedrearonly.Notorsionbarsallowedinrear.8.Nohydraulic,ratchetorelectricweightjacksallowed.NOairshocksorairbagsallowed.9.Shocksmaynotexceed$250racernet.Noexternally,rate-adjustableshocks.coil-overshocksallowed.10.Minimumwheelbase108”,bothsides.Maximumtrackwidth,78inchrimflangetorimflange.FUELSYSTEM:Racingfuelcellsrequiredandmustremainwithintheconfinesoftheoriginalframeandwithintheinsideofrearframe.Fuelcellmustbemountedbyatleasttwosteelstraps,twoincheswidearoundcell.Fuelcellsmustbeenclosedinsteelcontainerandmustalsobemountedsecurelyinrearofaxle,protectedbyrollcagetubing.Fuelcellmustbeamin.of4inchesaheadofrearbumper,betweenframerail,andnopartoffuelcellshallbelowerthanprotectivetubing.Protectivetubingmustcovertherearandextendpastbothsidesoffuelcell.Fuelcellsmusthavecheckvalves,andbladdersarehighlyrecommended.Fuelcellsarelimitedto32-gallonmaximumcapacity.Pick-upmustnotbeunderneathfuelcell.Allfuelcapstobesecuredwithasafetydevise.MUSTHAVESUPPORTBARSFROMFUELCELLHOOPTOFRAMERAIL.Fuelmaybeeithergasolineoralcohol.Nonitrousoxide.NOperformanceenhancingfueladditivesofanykind.Carsusingalcoholmusthaveletter―”A” displayedonsailpanelandbackpanel,6” tallmin,incontrastingcolor.HEADS:AluminumHeadsallowed.EXHAUST:MUFFLERS:Mandatory–97DECIBELSMAX-NOTOLERANCE.Carsexceedingdecibellimitwillnotcompete.Nopartoftheexhaustsystemmaypassthroughdriver’scompartment.

2020 Owosso Speedway Modified Class Rules

Owosso Speedway reserves the right to amend these rules at any time Page 8 of 9

REAREND:1.Anypassengercartypeortrucktyperearendmaybeused;noaluminumallowed,exceptloweringblocks,hubs,axlecap,driveplate,andspool.2.Quick-Changerearendallowed.Steelaxlesandtubesonly.3.Nocamberedrearends,onepiecedriveflangeonly.ROLLCAGE:1.Mustconsistofcontinuoushoopsnotlessthan1.666inchoutsidediameterandmusthaveawallthicknessofatleast.095inch.2.Mustbeframe-mountedinatleastsixplaces.Rollbarpaddingrequiredindrivercompartment.3.Mustconsistofaconfigurationoffrontandrearhoopsconnectedbytubingonthesidesorsidehoops.Driversheadmustnotprotrudeabovecagewithhelmetonandstrappedindriversseat.Musthaveminimumofonecrossbarintophaloofrollcage.Rollcagemustbesecurelysupportedandbraced.Drivermustbeabletoexitthroughthetopofthecar.4.Lowcarbon,mildsteeltubingisrecommended.Nobracingorsolderingallowed.5.Protectionoffeetismandatory.Baracrossbackofenginewithverticalbarsandrubrails,orsimilarprotection.6.Bracebarsforwardofcage,maybenohigherthanstockhoodheight.Maincagenofurtherforwardthanengineplate.7.Aminimumofthreedriversidedoorbars;atleast1.5inchO.D.,mustbeasparallelwiththegroundaspossible,andlocatedperpendiculartothedriversoastoprovidemaximumprotectionfordriver,butwithoutcausingunduedifficultyingettingintooroutofvehicle.Thesidebarsmustbeweldedtothefrontandrearoftherollcagemembers.Nobrazingorsolderingallowed.DOORBARSMUSTBEFILLEDCOMPLETELY.UPRIGHTTOUPRIGHT,FRAMERAILTOTOPDOORBAR-STEELONLY.095SPOILERRULE–4.75”X56”=264SQINCHESOR4”X66”=264SQINCHES.Spoilerwillbeclearlexanonly.Mustbecenteredandnotextendbeyondbumperorquarterpanels.Triangularverticals-5"x12" max.Tubularbracingallowed-¾max.Carsexceeding4" bodyrakemustreducespoilerheightby1" foreveryadditionalinch(orportionofinch)ofbodyrake.SHOCKS:$250RacerNet.SeeFRAMES#9SUSPENSION:Aluminumwheels,calipers,A-frames,spindlesoranyotheraluminumsuspensionsparts—notallowed.CaliperscannotbelightenedandmustbeOEM.Rotorscannotbelightenedordrilled.(Two-PieceRotorOKAY)Rotorsmayberedrilledfordifferentboltpatternorlargerstudsonly.4" minimumspringdiameter.TIRES:HoosierD800.Nosoakingallowed.Tiresfoundtobesoakedwillresultinimmediatedisqualificationandsuspension.TRACTIONCONTROLTractioncontrol:Allelectronicand/orcomputerizedwheelspinand/orignitionretardationand/oraccelerationlimitingand/ortractioncontroldevicesofanytypewillnotbepermitted.Adjustablepingcontroldevices,dialachipcontrolsand/orautomatedthrottlecontrolswillnotbepermitted.AdjustedRestrictorplateswillnotbepermitted.Remotecontrolcomponentsofanytypewillnotbepermitted.Radiosand/ordevicesfortransmittingvoiceand/ordatawillnotbepermitted.Dataacquisitionwillnotbepermitted.TRANSMISSIONS:1.Musthaveatleastoneforwardandonereversegear,plusaneutralposition.Withmotorrunning&carinastillposition,drivermustbeabletoengagecaringearandmoveforward,thenbackward.Nofivespeedtransmissions,―inandout boxesorquick-changetransmissionsallowed.2.Allmanualgear-typetransmissionsareallowed.Externallymountedclutchesmustbeinsideascattershield.Explosion-proofsteelbellhousingishighlyrecommended.3.AutomatictransmissionsmustremaininOEMstockappearingautomaticcase.Originalbellhousingmustremainandmusthaveanapprovedscattershieldorblanket.Scattershieldmaybeconstructedof.25” x2” steel,270degreesaroundflexplateorflywheel.

2020 Owosso Speedway Modified Class Rules

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WEIGHT:1.2400lbsminimumbeforeeventwithaminimumrightsideweightof1000lbs.2.Leadonlymaybeusedforballast.Allweightsmustbepaintedwhitewithcarnumberpaintedincontrastingcolor.Anyweightfoundnotpaintedwhite,withcarnumber,willbedisqualified.Weightswillbeanchoredwith(2)½"diaboltsminimum.WHEELS:Any8” steelwheel.Maximumtreadwidthnottoexceed78” measuredatrimflange.NOTOLERANCE.MIRRORS:NOmirrorsallowed.