Ariel Atom 4


Ariel Motor Company announces the launch of the latest evolution of the Ariel Atom, now in its fourth generation, the all-new Atom 4. 

Designed by the in-house Ariel team, the Atom 4 continues the now iconic design but is an entirely new car from the ground-up.  Building on the learning from previous generations, customer feedback,Ariel assembly technicians and significant R&D by Ariel in recent years, the Atom 4 preserves the essential Ariel qualities but progresses the design and engineering further into the most powerful and able Atom yet.

Atom 4 features the latest Honda Type R turbo engine giving 320bhp as standard, all-new chassis, suspension, steering and brakes, all-new bodywork with significant aerodynamic improvements, new seating and instrumentation together with a host of design improvements and changes.  With an open design brief to improve the car wherever possible, the Atom 4 represents another big step forward in the evolution of the Atom.

The basis of Atom 4 is an all-new tubular chassis, designed in-house by the Ariel engineering and design team, with much learning coming from the Titanium Chassis R&D project of 2014.  Featuring larger diameter main and diagonal tubes than previous Atoms, as well as many detailed additions, each tube within the chassis has been analyzed and optimized to give a light but extraordinarily strong structure.  The torsional stiffness has been increased by 15% compared to the previous generation Atom 3.5.

The combination of sophisticated CAD (Computer Aided Design) and FEA (Finite Element Analysis) design work resulting in a hand-made, bronze welded structure reflects Ariel’s approach to design and manufacture, combining new technology with exceptional craftsmanship. The chassis gives more interior space and legroom than previously and has been designed and proven to well exceed the demands of a full frontal 50kph barrier impact, seat belt, and rear impact test.  Forming a driver/passenger safety cell the Atom chassis offers the highest degree of protection in its class. Chassis are treated to a three-stage finishing process of phosphating, powder coating to color choice and powder coating lacquer.

At the heart of the Atom 4 is the new Honda Type R K20C 2.0L 4 cylinder direct injection, turbocharged engine. Building on the 15-year relationship with Honda UK with Honda power in Atom 2, Atom 3 and Ariel Ace motorcycles, Ariel has signed a new agreement for engine supply with Honda.  Said Simon Saunders: “The Honda agreement is critical for us and our customers.  The Type R engines have proven themselves in Atoms over the years with dependable power and absolutely faultless reliability, even under race conditions, so there really is no better engine for the Atom.”

The 1996cc direct injection turbocharged engine, producing 320bhp as standard in the Atom – 10bhp more than the previous supercharged Atom – gives the Atom 4 more power than any previous standard model.  An astonishing 420Nm of torque is a massive 75% increase over a standard Atom 3.5 and a 35% increase over a supercharged Atom 3.5. 

Mapped by Ariel using an MBE ECU (Electronic Control Unit) developed specifically for the car will allow the Atom 4 to meet Euro Vl emissions standards, a critical factor of the EUSSTA testing.  Optional Launch and Traction Control is a new feature built into the electronics of Atom 4, derived from the Atom V8.  Atom 4 also features the ability to adjust and optimize turbo boost levels for different road and track conditions.

An all-new exhaust system, again designed to meet EUSSTA standards as well as racetrack noise levels, features a ceramic honeycomb, high palladium/rhodium content catalytic converter, 3”/75mm diameter stainless system into a twin outlet, 8.4”/215mm stainless silencer.  A high flow single outlet system is an option as is a de-cat system for use on the track.

A larger capacity fuel tank sits on the left-hand side of the car, improving range on road and on track, giving a road range of some 300 miles.

Suspension And Steering
Retaining the inboard, pushrod operated damper system the Atom 4 features all new suspension geometry.  Based on 18 years of continual development from Ariel and design input from suspension guru Richard Hurdwell, the new geometry includes revised inboard and outboard points plus anti-squat and anti-dive to reduce unnecessary body roll and weight transfer, keeping as much tire contact as possible at all times.  All new Bilstein dampers sit inboard operated by pushrods via new geometry bellcranks, with an optional semi-active Ohlins package under development for production.

Revised steering rack and geometry give the new Atom accessibility for all types of drivers under all driving conditions, with the option of a quick rack for track-focussed cars. An improved turning circle has also been achieved with the new suspension and steering rack geometry to aid town driving and parking.

Wheels and Tires
Moving up in size the Atom 4 sits on 7Jx16” front wheels and 9Jx17” rear wheels.  Multi-spoke alloy wheels are standard fitment but, in a first for Ariel, the Atom 4 has the option of full carbon wheels.  These represent a weight saving of nearly 50% over an alloy wheel and a total reduction of over 16 kilos. The wheels, made to Ariel specification by BST in Johannesburg (who also make the carbon wheels for the Ariel Ace), significantly reduce unsprung weight together with new aluminum uprights, which alone give a 50% weight saving over the previous car.

Tires are 195/50R16 front and 255/40ZR17 rear. In a new exclusive partnership with Avon Tyres, the Atom will be fitted with high-performance Avon ZZR tires.  With recent changes in tire law and noise, it is important that the highest performing tires are available to the Atom.  The combination of new suspension and larger section Avon tires contribute to the Atom 4 having more mechanical grip than any previous Atom.  Not only is straight line performance improved for the Atom 4 but cornering speed moves to another level also.

The all-new standard braking system increases in size, due to the higher power of Atom 4, with 278mm vented discs and cast two-piston caliper on the front with 253mm discs on the rear and integrated handbrake caliper.   An optional upgrade is to a full AP Racing configuration of 290mm vented discs front and rear with alloy 4 piston calipers.  A variety of brake pads are available dependent on the use of the car.  An all-aluminum pedal box with brake, clutch and throttle pedal is supplemented by the optional cockpit adjustable brake bias. Goodridge stainless hose for both brake and clutch hydraulic systems is standard fitment.

The Atom 4 features an all-new look and while recognizably an Atom, every panel on the car is new.  One of the fundamental design principles on Atom 4 was aerodynamic improvement, control of airflow and overall balance of the car.  Working in partnership with TotalSim, CFD (Computational Fluid Dynamics) experts in Brackley, and in keeping with the original Ariel ‘Form Follows Function’ philosophy, major aerodynamic improvements have been made in every area of the car.  Drag has been reduced, downforce increased and mass flow rate to radiator, intercooler and air intakes greatly increased.  A shift in aero-balance has been achieved to give neutral handling and more precise control at the limit.

Immediately noticeable is the disappearance of the familiar central Atom roll hoop, now enclosed under the air intake bodywork, which itself has been reduced in size. This has greatly improved air passing over the rear bodywork and controls airspeed going through the ram-air system. Similarly, the new nose cone has smaller openings and internal ducting to reduce drag and decelerate airspeed, maximizing efficiency through the front mounted radiator.  The intercooler mounted behind the tub, in a low-pressure area, keeps the unit close to the engine and is also supplied with air from under the car, optimizing cooling efficiency.

The trademark Atom ‘aero screen’ has been further refined and now reaches all the way across the car, reducing ‘helmet lift’ for the occupants, directing air to the engine intake and, with just this aero fence, generating 100 Newtons of downforce.  The mudguards on all four wheels also feature an aero device to give downforce directly to tires negating any lift from mudguards. Bodywork will be available in full carbon for many of the body parts, reinforcing the ‘Less = More’ Ariel philosophy of performance through lightweight.

Exterior and Interior
All exterior lighting has been revised with LED indicators, stop/tail/fog and reverse lights, daytime running lamps and high-performance halogen headlights to conform to EUSSTA regulations.  Ambient light sensors allow auto light functionality.

Additional storage space has been included under the removable front body cover, extending the cubby box, together with access to the new hydraulic system. Individually adjustable single seats replace the twin seat unit of previous Atoms and a comprehensive study into ergonomics has subtly repositioned pedals, steering wheel, and instruments.  Already a comfortable space for most drivers, an additional 50mm of cabin length and 20mm width has been added to accommodate the very widest range of users.

The new switch cluster, again designed to EUSSTA standards, features all controls within finger reach of the 310mm suede steering wheel including lighting, indicators, adjustable traction and launch controls.  The central instruments, with full-color TFT (Thin-Film-Transistor) screen made for the Atom 4 by AIM, can be scrolled through multiple menus for the road, track or set up use. The instruments also have gear position and shift lights as standard plus provision for real-time race track data-logging.  Using the AIM PDM (Power Distribution Management) system, communicating directly with the ECU via CAN (Controller Area Network), the vehicle wiring harness and fuse box have been simplified and therefore light-weighted.

Atom 4 is the fastest standard Atom produced so far. With the dramatic increase in torque, as well as 320bhp as standard, both standing start and in gear acceleration times are the fastest yet for a standard Atom: 0-60mph in 2.8 seconds, 0-100mph in 6.8 seconds retain the Atom’s giant-killing performance.

Ariel Atom 4


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