Caterham Seven 620R
The Caterham Seven 620R represents the absolute outer limit of the Seven concept -- a car so powerful relative to its weight that it achieves a power-to-weight ratio exceeding 620 horsepower per ton. When Caterham fitted a supercharged 2.0-liter Ford Duratec engine to their featherweight spaceframe, they created what is arguably the most extreme road-legal car available from any manufacturer.
The engine is a 1,999cc Ford Duratec inline-four fitted with a supercharger, producing 311 horsepower at 7,700 rpm. This is an enormous output from a 2.0-liter engine, achieved through the combination of forced induction, high-flow individual throttle bodies, performance internals, and aggressive engine management calibration. The supercharger provides instant boost response without turbo lag, perfectly suited to the Seven's instant-reaction driving character.
At approximately 545 kg, the 620R achieves its namesake power-to-weight ratio with mathematical precision. This figure places it in the same territory as a Formula 3 racing car and far beyond any road car costing less than seven figures.
The 620R uses a six-speed sequential gearbox with a flat-shift capability that eliminates the need to lift the throttle during upshifts. The sequential mechanism requires a simple forward push for upshifts and a rearward pull for downshifts, allowing the driver to maintain focus on the road while executing gear changes in milliseconds.
The chassis is the latest evolution of the Seven spaceframe with additional bracing for the 620R's higher loads. The suspension uses fully adjustable double wishbones at the front and a de Dion rear with adjustable coil-over dampers. The setup is significantly stiffer than lesser Sevens, reflecting the 620R's track-focused mission.
Braking uses ventilated and cross-drilled discs at the front with four-piston calipers and solid discs at the rear. The system provides immense stopping power relative to the car's minimal weight, with pedal feel and modulation that are the equal of any racing car.
Carbon fiber body panels, a carbon fiber dashboard, minimal weather equipment, and lightweight racing seats contribute to the 620R's featherweight total. The car is delivered with a racing harness, roll cage, and fire extinguisher as standard, acknowledging its primary purpose as a track tool that happens to be road-legal.
Performance is staggering: 0-60 mph in under 2.8 seconds with a top speed electronically limited to 155 mph. Lateral acceleration exceeds 2g on track tires. These figures place the 620R among the fastest-accelerating and highest-cornering vehicles available at any price.
The 620R is not a comfortable car. It is loud, harsh, exposed to the weather, and demands constant attention from the driver. It is also one of the most thrilling mechanical experiences available in the modern automotive world -- a car that makes every journey an event and every corner an adventure.
Supercharged engine condition is the primary concern -- check for boost leaks, supercharger bearing noise, and oil consumption. The sequential gearbox requires specialist inspection for dog ring wear. Chassis should be checked for stress cracks at the most highly loaded mounting points. Many 620Rs see extensive track use -- assess wear patterns accordingly. Carbon fiber body panels should be inspected for impact damage.
Built by Caterham Cars in England. The 620R sits at the absolute top of the Seven range, representing the most powerful and focused specification available in road-legal form.