Ariel’s fabled superlight track car, the Atom, has many admirers the world over. But the built-from-scaffolding-and-horsepower go-kart, famous for turning Jeremy Clarkson’s face into putty, now has a new version.

It's just a cartoony rendering - but expect the real car to be way more serious.
While the original was available with a supercharged, 300-horsepower (224kW) Honda Civic Type-R motor, its new Mugen special has an engine tuned by the British arm of Honda’s racing specialists. The limited edition Atom Mugen boasts a bespoke 270-horsepower (201kW), naturally aspirated motor. It’s 25-horsepower (19kW) more than the regular engine in the Atom 3, with power coming from strengthened internals and the like.
Ariel says this raises the light little car’s power-to-weight ratio to a whopping 549-horsepower per ton: more than even a Veyron. This helps the Ariel race to 100km/h in about 3 seconds and on to a top speed of a 245km/h. More than you’ll need to kick ass on the straights and bends at most of the world’s famous race tracks.
Only ten Atom Mugens will be built, with each one having a plaque signed by the Ariel and Mugen engineers who worked on the car.
Of course, the announcement of one track car isn’t enough. We want more. And Caterham – famous for its certified Lotus 7-based kit cars – this week also unveiled its new SP/300R racer. It’s a mini LMP, of sorts, similar to the Radical SR3 and Lotus 2-Eleven.

The SP, Caterham’s first new car in more than 20 years, is purely track focused with obvious race bits like exhaust ducted and adjustable aero, and pushrod dampers. Motivation comes courtesy of a 300-horsepower (224kW) supercharged version of the 2-litre Ford Duratec engine (previously seen in the Fiesta ST and, amusingly, built in Chihuahua, Mexico). Stopping power comes courtesy of an AP Racing brake system and grip from bespoke Cooper racing slicks.

Caterham will only make 25 of them this year, for a one-make series starting in 2012, while there are no plans for a road-going version just yet. Then again, why bother posing on a stylish boulevard when you could be carving corners at Killarney or Kyalami?
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It’s just a cartoony rendering – but expect the real car to be way more serious.
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(Photo credits: Caterham and Ariel).