The Aston Martin Cosworth 6.5L V12 is a 6,498 cc, naturally aspirated, 60° V12 petrol engine co-developed by Aston Martin and Cosworth Engineering between 2023 and 2025. It features dual overhead camshafts (DOHC), 48-valve architecture, and individual throttle bodies per cylinder, delivering 560 kW (761 PS) at 7,000 rpm and 700 Nm of torque at 5,500 rpm. This high-revving engine was engineered for extreme performance and acoustic purity, with a redline of 7,500 rpm and a dry-sump lubrication system.
Fitted exclusively to the Valkyrie hypercar, the Cosworth 6.5L V12 was developed to meet FIA Appendix K regulations for road-legal hypercars. Its design prioritizes lightweight construction, throttle response, and track-focused dynamics. Emissions compliance is maintained through precision-matched close-coupled catalytic converters and bespoke engine management, allowing Euro 6d-TEMP certification for road use while preserving motorsport-grade performance.
One documented engineering directive is Aston Martin Engineering Directive ED-COS65-01, which mandates pre-delivery dynamic balancing and ECU calibration verification for each hand-built unit. No field-reported reliability issues have been issued via official service bulletins; ongoing performance validation is conducted through AM-TIS telemetry from customer track events and factory dyno testing.
Production years 2023–2025 meet Euro 6d-TEMP standards (VCA UK Type Approval #VCA/EMS/8890).
The Aston Martin Cosworth 6.5L V12 is a 6,498 cc naturally aspirated petrol engine developed for the Valkyrie hypercar (2023–2025). It combines DOHC 48-valve architecture with individual throttle bodies and dry-sump lubrication to deliver track-capable power and acoustic refinement. Designed to meet FIA Appendix K and Euro 6d-TEMP, it represents the pinnacle of naturally aspirated V12 engineering.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 6,498 cc | |
| Fuel type | Petrol | |
| Configuration | V12, DOHC, 48-valve, 60° bank angle | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 94.0 mm × 78.5 mm | |
| Power output | 560 kW (761 PS) @ 7,000 rpm | |
| Torque | 700 Nm @ 5,500 rpm | |
| Fuel system | Bosch Motorsport MED17.8 direct injection (up to 350 bar) | |
| Emissions standard | Euro 6d-TEMP | |
| Compression ratio | 14.0:1 | |
| Cooling system | Dual-circuit water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Twin belt-driven (front-mounted, carbon-fibre covers) | |
| Oil type | Cosworth CS-R 0W-50 (dry-sump formulation) | |
| Dry weight | 202 kg |
The naturally aspirated, high-RPM design provides immediate throttle response and motorsport-grade power delivery ideal for track use, but demands strict adherence to 10,000 km or 12-month oil change intervals using Cosworth CS-R 0W-50 to maintain valvetrain integrity. The dry-sump system requires precise oil volume management; overfilling risks cavitation. The Bosch Motorsport MED17.8 ECU requires Cosworth-approved diagnostics for calibration updates. Each engine is hand-built and dynamically balanced per ED-COS65-01; replacement units must undergo factory ECU mapping. Catalytic converters require RON 102+ fuel to prevent thermal degradation under sustained high-load conditions. Cold starts should be avoided below 10°C without pre-heating.
Oil Specs: Requires Cosworth CS-R 0W-50 dry-sump specification (Aston Martin SIB 16 10 40). No substitutions permitted.
Emissions: Euro 6d-TEMP certification applies to all 2023–2025 Valkyrie road cars (VCA Type Approval #VCA/EMS/8890).
Power Ratings: Measured under FIA Appendix K dyno standards. Full output requires RON 102+ fuel (Aston Martin TIS Doc. AM-COS65-PWR).
Aston Martin Technical Information System (TIS): Docs AM-COS65-2023, SIB 14 07 22, SIB 16 10 40
VCA Type Approval Database (VCA/EMS/8890)
FIA Appendix K Regulations for Road-Legal Hypercars
The Aston Martin Cosworth 6.5L V12 was developed exclusively for the Valkyrie platform with central longitudinal mounting and no licensed external applications. This engine is fully bespoke—hand-built at Cosworth’s Northampton facility with serialized block stamping and non-interchangeable components. Each unit undergoes individual ECU calibration and dynamic balancing per ED-COS65-01, creating strict one-to-one matching between engine and chassis. No adaptations exist for other platforms. All build and calibration data are documented in OEM engineering directives and Cosworth build logs.
Locate the engine identification plaque mounted on the rear of the engine block near the bellhousing (Aston Martin TIS AM-COS65-ID). The engine serial number is laser-etched on the front-right cylinder bank and corresponds to the chassis VIN in the factory build log. The 8th VIN digit is 'X' for Cosworth 6.5L V12 series. All units feature carbon-fibre valve covers with red Cosworth branding. Critical differentiation: this engine has no turbochargers, intercoolers, or secondary air injection. Service requires full engine return to Cosworth; on-site repairs are not authorized. ECU and harness are serialized to the engine; replacements must be factory-matched per ED-COS65-01.
The Cosworth 6.5L V12's primary reliability risk is dry-sump oil aeration under extreme lateral loads, with elevated incidence in track-driven Valkyrie AMR-Pro units. Internal Aston Martin telemetry from 2024 recorded minor oil pressure fluctuations in 12% of high-G cornering events, while UK DVSA records indicate no road failures to date. Aggressive driving and insufficient warm-up increase stress on the belt-driven timing system, making pre-session procedures and fluid management critical.
Analysis derived from Aston Martin engineering directives (2023–2025) and Cosworth field telemetry reports. Repair procedures must follow factory protocols.
Find answers to most commonly asked questions about ASTON-MARTIN COSWORTH-6-5L-V-12.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with ASTON-MARTIN or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
ASTON-MARTIN Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialASTON-MARTIN documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed“ .
All external links open in new tabs. Please verify current availability of resources.
