Superkart

The word Superkart has traditionally been used to mean 250 cc engine karts with gearboxes, the fastest category in Kart racing racing on full size car circuits. 250 cc Superkarts often set faster lap times than much more expensive and technically advanced racing machines.^[1] · ^[2] Some British and Australian classes also include 125 cc gearbox karts.

The most obvious difference between a Superkart and any other form of kart is that they have full aerodynamic bodykits and race on car circuits over 1,500 metres in length. The power unit can be specially designed kart engines or production motorcycle engines with either 5 or 6-speed sequential gearboxes. Owing to their high top speed and superb cornering ability, a Superkart's aerodynamic bodywork includes a front fairing, larger sidepods, and a rear wing. They use either 5 or 6 inch diameter tires and wheels.

A Formula E/Division 1 Superkart at Castle Combe

Superkarts race on "long circuits" (e.g. Silverstone, Laguna Seca, Magny-Cours). In the UK they also race on "short circuits"^[3] (e.g. Kimbolton), "short circuits" are under 1,500 metres in length.

Superkarts are raced worldwide. There is a CIK-FIA European Superkart Championship (for 250 cc karts only).

Performance

Powered by a 2-stroke 250 cc engine producing 95 hp (71 kW) for an overall weight including the driver of 215 kilograms, Superkarts have a power/weight ratio of 440 hp/tonne (330 W/kg)(c.5 lbs/hp). Superkarts can accelerate from 0 to 60 mph in less than 3 seconds with a top speed of 155 mph (250 km/h)^[4]. Their low weight and good downforce make for staggering cornering^[5] and braking abilities^[6]. A Superkart is capable of braking from 100 mph (160 km/h) to standstill in around 2 seconds, and taking corners at nearly 3 g (30 m/s²)^[7].

At some circuits, Superkarts are the outright lap-record holders^[8], at others they run at around Formula 3 lap times.^{[citation needed]}

British Superkart Divisions :

Ben Wilshire British 125 Open class Superkart

• Division 1 is open to 250 cc karts with one or two cylinders and five or six speed gearboxes. Typically the karts produce 90 hp and are capable of 160 mph - the fastest form of kart. This formula was previously known as Formula E.
• Division 2 is for single cylinder karts with 5 and 6-speed boxes. Typically these karts produce 65 hp and are capable of 140 mph. However, being lighter than the twin cylinder (Division 1) karts they can be as quick on twisted circuits. This formula was previously known as 250 International. However the main British series is for single cylinder 250 cc karts with 5-speed only, also known as 250 National.
• 125 Open - Powered by 125 cc engines and again featuring 6-speed sequential gearboxes, this class uses lighter chassis than the 250's.

Australian Superkart Classes ^[9]:

2007 Australian 250 cc International champion Warren McIlveen (Stockman-Honda)

Four (until recently five) engine configuration based classes compete for state and national Superkart Championships, as typified by the Australian Superkart Championships.

• 250 cc International - commonly referred to as 250 twins, these Superkarts are powered by twin cylinder Grand Prix motorcycle engines, or specialist kart racing reed-valve engines such as Rotax, PVP, BRC or Safe and usually have 6-speed sequential gearboxes.
• 250 cc National - The single cylinder cousin of 250 twins, the National Class Superkarts are powered by 250 cc MotoX (motocross) engines and also feature 6-speed sequential gearboxes.
• 125 cc Gearbox - Powered by 125 cc Grand Prix motorcycle engines and again featuring 6 speed sequential gearboxes, this class uses smaller and lighter chassis than the 250's.
• 80/85 cc Gearbox - the smallest of the Superkarts to feature 6 speed sequential gearboxes utilising an 80/85 cc MotoX engine. Recently removed from CAMS manual several karts still exist and compete in 125cc division but no longer have a national championship of their own.^[10]
• Non-Gearbox - dominated by RotaxMAX sprint karts with long circuit gearing, this class is growing in popularity as more sprint kart owners look to Superkarts for a new challenge. ^[10]Three national championships exist for two weight divisions, Heavy and Light, and a Junior division for drivers under the age of sixteen which run a version of the Rotax Max engine without a power valve.

United States Superkart Classes^[11] :

• 250 cc Formula/E or F/E - Twin cylinder, 6-speed, liquid cooled Grand Prix motorcycle engines such as the Honda RS250, Yamaha TZ250 or made for karting engines such as the BRC250.
• 250 cc Inter-Continental E or IC/E - Single cylinder, 5 or 6-speed, liquid cooled Grand Prix motorcycle engines.

Spectacle

Being inexpensive, Superkarts are very popular, and entries of 60 or more are common in Britain. Fortunately, most circuits allow for a large number of karts on the grids at once, and the sight of 60 karts arriving at the first corner at the same time is a real spectacle. The overtaking tends to be easy, as, like motorbikes, there is room to get past, so the races tend to be full of action. Race lengths tend to be around 20–25 miles (30–40 km), because the fuel tanks are quite small, so at most meetings which feature Superkarts, the karts race is often a brief, spectacular highlight (U.S. Superkart races are a timed 30-minute race; Pre-Final on Saturday, Final on Sunday).

A global category, Superkarts are endorsed by the FIA, and were featured as a support category to the French Formula 1 Grand Prix at Magny-Cours in 2007 where they bettered Porsche Supercup lap times.^[1]

Notes

See also

• Australian Superkart Championship
• Environmentalism in motorsport
• Kart circuits
• KZ1
• KZ2

External links

• Superkart at the Open Directory Project
• CIK-FIA - International Karting Governing Body
• BSA - British Superkart Association
• 1990 - 2007 CIK Results