2021 Ariel Atom 4

KEY FACTS

• A thrilling, lightweight performance machine, this Ariel Atom 4 is an exceptionally focused, road-legal track car with a potent uprated power output.
• It is powered by a turbocharged 2.0-litre Honda inline-four engine, upgraded to deliver approximately 350bhp, driving the rear wheels via a six-speed manual transmission and a limited-slip differential.
• First registered in March 2021, this example has been with the seller and the second owner for two and a half years.
• The odometer shows just 7,393 miles from new.

EQUIPMENT AND FEATURES

• This Atom 4 features yellow and black body panels over a gunmetal chassis, and inside, the cabin features black moulded plastic seats with black fabric padding, a black Alcantara-trimmed steering wheel, and an aluminium gear knob and handbrake lever.
• It rides on a set of 17-inch multi-spoke alloy wheels finished in gloss-black and fitted with Avon ZZ-S tyres.
• Equipment includes the 350bhp upgrade, an ECU reflash, a decat pipe, a limited-slip differential, adjustable traction control with launch control, and a three-stage variable turbo boost controller.
• Performance-focused hardware includes Öhlins TTX three-way adjustable dampers, AP Racing four-piston brake callipers with 290mm discs front and rear, a baffled oil sump, and cockpit-adjustable brake bias.
• Additional features comprise an aero screen, a high-level brake light, a reversing camera system, a track day lap timing system with video and data logging, and an AutoTrac tracker.
• Convenience and usability features include 12V auxiliary feeds (USB and socket), a battery optimiser/trickle charger, a locking fuel cap, and passenger and clutch footrests.
• It is also equipped with Ariel-branded harnesses with alloy chest adjusters and harness pads for both occupants, an Ariel-branded digital display, and a Tilton pedal set.
• The sale includes two keys, the owner’s manual, the AutoTrac box, the V5C, a specification printout, and a collection of maintenance invoices from Ariel Motor Company.

CONDITION

• Please refer to the photo gallery to assess the exterior and interior condition.
• Specific notes from the seller include: very faint blemishes on the wheel arches, consistent with general use.
• The car’s last MOT test was conducted on 20 March 2026 at 7,392 miles, which resulted in a first-time pass with no advisories.

SERVICE HISTORY

• This Atom 4’s most recent routine maintenance was carried out in March 2026 at 7,380 miles by Ariel Motor Company, including an engine oil and filter change, a transmission oil change, a new fuel filter, the brake fluid renewed, replacement suspension rod ends (LH and RH), and new brake pedal grip tape.
• The previous service was completed in February 2025 at 6,399 miles, including an engine oil and filter change, new transmission oil, a new fuel filter, the brake fluid renewed, new antifreeze, spark plugs, suspension rod ends, and renewed chassis rail protection.
• Prior to this, a service was carried out in March 2024 at 5,487 miles, including an engine oil and filter change, a transmission oil change, renewed brake fluid, new spark plugs, and the installation of the AutoTrac tracker.

Dates and Mileages:

• Jun 2021 – 604 miles – Ariel Motor Company (evidenced)
• Aug 2022 – 3,419 miles – Ariel Motor Company (evidenced)
• Mar 2024 – 5,487 miles – Ariel Motor Company (evidenced)
• Feb 2025 – 6,399 miles – Ariel Motor Company (evidenced)
• Mar 2026 – 7,380 miles – Ariel Motor Company (evidenced)

SUMMARY

This Ariel Atom 4 is a highly focused and exhilarating lightweight performance car, enhanced with a desirable 350bhp upgrade and a comprehensive suite of track-oriented equipment. With two owners since new and a consistent service history from the manufacturer, it represents a compelling example of this modern track-day icon. Equally at home on fast road drives or circuit use, it offers an engaging and visceral driving experience that few cars can match.

Descriptions are provided by the seller and, to their knowledge, are accurate and not misleading. Buyers must satisfy themselves of the description’s accuracy, and independent research is strongly advised. Enquiries should be raised in the comments section and any inspections arranged before bidding.

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All UK-registered cars and motorbikes on Collecting Cars are run through an online HPI check. On the HPI report, this vehicle shows no insurance database markers for damage or theft, and has no finance owing.