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Karting 101 Fast Motorsports & Cloud 9 Racing Jeff Cloud Erik Frank.

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Presentation on theme: "Karting 101 Fast Motorsports & Cloud 9 Racing Jeff Cloud Erik Frank."— Presentation transcript:

1 Karting 101 Fast Motorsports & Cloud 9 Racing Jeff Cloud Erik Frank

2 Types of karts Sprint kart –Sit up –Weight ~ 350 lbs –Engines - 2 or 4 stroke 100cc Yamaha, Rotax 80 – 125cc dirt bike Briggs & Stratton –HP - 8 ~ 40+ –Top speed ~ 100 mph 125cc Shifter Kart

3 Types of karts Enduro kart –Laydown –Road racing only –Engines - 2 stroke Piston port (KT100 Yamaha, TKM) Reed/Rotary (DAP, Parilla, Komet, PCR) –Top speed >100 mph Laydown Enduro Kart

4 Types of karts Super kart –Wings –Weight ~ 450 lbs –Engines - 2 stroke Rotax 257 Motocross bike (CR 250, YZ 250) 250cc Twin: Rotax 256, Yamaha TZ-250 (G.P. derived) –HP (singles) 90+ (twins) –Top speed ~ 150 mph Super Laguna Seca

5 Kart Engines 101 Yamaha KT cc Reed CR-125 YZ-125 Rotax 257 SGM F/E (Rotax 256) Rotax Max FR125

6 Racing Formats Sprint Racing –Tight, twisty tracks < 1 mile long –Speeds limited to <75 mph –Short races (typically laps) –Very quick pace –Very physical –Texas Sprint Tracks: Hill Country Kart Club (New Braunfels) North Texas Karters (Denton) Gulf Coast Karters (Houston) Waco NTK – Denton, TX

7 Racing Formats Road Racing –Run on large road racing courses –Longer races (usually 30 minutes) –High speeds - over 100 mph for some classes –Large fields –Regional Road Race Tracks: Texas World Speedway (College Station) Motorsport Ranch (Cresson) Oak Hill Raceway (Henderson) Hallet Motor Racing Circuit (Oklahoma) Oak Hill – Henderson, TX Typical 125cc Grid

8 Kart Racing Organizations

9 Kart vs. race car handling Karts Very quick steering response Short wheelbase and wide track Direct acting steering linkage (typ. 1/3 turn lock-to- lock) Must be smooth to achieve quick lap times Cars Slower steering response Longer wheelbase vs. track Heavier Smooth is still fast

10 Kart vs. race car handling Brakes –Sprint kart brakes only on rear –125cc Shifter karts and Super karts also have front wheel brakes –Approx. ~2G deceleration is possible Front Brake assy (Brembo) Rear brake assy (Brembo)

11 Must lift inside rear tire to go around corner – Solid axle wants to go straight – King Pin Inclination (KPI) and caster cause inside front wheel to drop and outside front wheel to rise which tilts kart to outside of turn and lifts inside rear wheel (Jacking Effect) – Caster and front track width (offset) alter jacking effect Kart chassis setup Kart setup seems to be contrary to conventional auto practice – Stiffen chassis and increase weight transfer for low grip track – Soften chassis and decrease weight transfer for high grip track

12 Kart Cornering 101 Look!

13 Karts will never have zero caster, typically negative 15 degrees Karts typically run +/-1 degree camber (will go more negative as chassis flexes) Camber/Caster Orientation

14 Kart Chassis Setup Center of Gravity – Driver is largest mass Location has critical effect on handling – Raising driver increases weight transfer Low grip track - higher seat position High grip track - lower seat position – Raising ride height also increases weight transfer

15 Kart Chassis Setup Tire Pressure Track Width Adjustments –Increase Rear track: (decreases rear grip) –Increase Front track: (increases weight transfer) Up to a point! –Higher pressures  Increases temperatures  Increases grip

16 Safety Helmet Gloves Racing shoes Neck Collar Suit or heavy jacket and long pants –Not fireproof, abrasion resistant –Typically made of Cordura/Nylon Safety is Important!

17 Measured parameters Lap time Sector times RPM Speed Water temp Exhaust gas temp Lateral / longitudinal G Steering position Throttle position Tire Temps Etc… Data Acquisition Aim Sportsystems EVO 3

18 Data Acquisition Analysis software versatility: Alfano Pro D/A –Handling evaluation Oversteer/Understeer (driver or kart induced) –Engine performance Engine tuning aid Horsepower calculation –Driver training / consistency Lap time comparisons Kart behavior at specific locations on track –Eliminate guessing Solid foundation for setup changes

19 AIM Sportsystems Race Studio

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21 Kart Engine Tuning Overview Intake Cylinder porting Ignition Exhaust 

22 Kart Engine Tuning - Intake Mixture setting is critical –Carburetor adjustments: Main Jet Needle Fuel system (delivery) –Reed cage setup reed material aftermarket options Keihin PWK Carb V-Force Reed Cage

23 Kart Engine Tuning - Porting Exhaust Port timing is important –Higher ports  “More top end” –Lower ports  “More torque” Compromise between port area and piston/cylinder life Auxiliary “Boost” Ports Transfer Ports Inlet Ports (piston port) Exhaust Ports

24 Kart Engine Tuning - Ignition Static Advance –Stator setting on crankshaft Dynamic Advance –Achieved by CDI box (on shifter engines) –Digital Programmable systems available CDI Box Coil Rotor/Stator Harness Spark Plug Boot

25 Kart Engine Tuning Overview Exhaust – Pipe Selection –Determines Operating Powerband Experimental Pipe setup – YZ 125

26 Dyno Testing Optimization of YZ-125 for Roadracing –Porting –Cylinder head –Piston –Intake –Ignition –Exhaust

27 Dyno Testing  

28 Road Atlanta - Nov turns – 2.54 miles Substantial elevation changes 5000 ft. Long “straight” 250cc Super kart lap time: 1:34 (97.2 mph avg!)

29 Wrap-Up Questions? Show and Tell


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