Mercedes-AMG High Performance Powertrains (HPP) supplies McLaren’s Formula 1 power unit for 2026–2030; McLaren designs and develops the MCL40 chassis and complete car around it. McLaren also integrates the unit and works with HPP to optimize its use. Outside suppliers design or manufacture selected components, so “McLaren builds the car” does not mean every part is made in-house.
Who is responsible for the power unit and chassis?
| Area | McLaren | Mercedes-AMG HPP |
|---|---|---|
| Primary responsibility | Design and development of the MCL40 chassis and car; installation, integration and performance exploitation of the supplied unit | Development and supply of McLaren’s power unit |
| 2026 evidence | McLaren describes a major redesign by its technical team and an internal group focused on power-unit performance | McLaren’s announced agreement makes HPP the supplier from 2026 through 2030 |
| What is not publicly itemized | The maker and design owner of every individual car component | Detailed contractual design rights and every integration interface |
The agreement was announced on 24 November 2023 and covers the 2026–2030 seasons. McLaren said HPP had been developing the 2026 unit at its Brixworth facility since mid-2022. That identifies HPP as the power-unit developer and supplier; it does not mean McLaren has no engineering role in installing or operating the unit. McLaren’s power-unit agreement announcement
What does “power unit” mean here?
It is broader than the internal-combustion engine alone. McLaren’s MCL40 design feature describes the 2026 unit as retaining a 1.6-litre turbo V6, using the MGU-K for electrical deployment, and removing the MGU-H. Those details describe the 2026 technical package; they do not change the supplier split. McLaren’s 2023 agreement announcement described a 50:50 internal-combustion/electrical power balance as the intended regulatory target, not as a measured output from McLaren’s car. McLaren’s MCL40 design feature McLaren’s agreement announcement
What does McLaren design and develop?
McLaren’s technical organization develops the chassis and the car as a whole, including the aerodynamic and mechanical design work needed to meet the regulations. Its account of the MCL40 describes a major redesign undertaken over roughly 20 months, as chassis, power-unit and tyre rules changed at the same time. Chief Designer Rob Marshall said, “every single part of the car is impacted” by the rules; that describes the breadth of the redesign, not a claim that McLaren manufactures each part itself. Behind the design of the MCL40
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What engineering work does McLaren do with the supplied unit?
McLaren’s role is not simply to receive a finished unit and bolt it into the car. The team has an internal power-unit performance group that studies track data and assesses HPP’s event and session energy-use options against McLaren’s tools, the MCL40’s requirements and race conditions. Factors cited by the team include wind, grip and fuel load. McLaren engineers make recommendations in close coordination with race engineers and HPP engineers. How McLaren responded to F1’s new regulation challenges
The first MCL40 fire-up at Woking involved both McLaren and Mercedes HPP personnel. That joint activity illustrates the cooperation required to install and check the complete car; it does not make the chassis and power unit jointly owned or designed. MCL40 first fire-up
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Does McLaren manufacture every part itself?
No. McLaren describes an integrated supplier network that contributes specialist components and manufacturing capability. For 2026, for example, it says Staffordshire Precision Engineering and Matsuura support manufacturing capability for car production. Separately, Enkei’s announced 2026 role covers the design, development and manufacture of forged magnesium wheels for the team. These examples show that responsibility varies by component; they are not a complete supplier list. McLaren’s supplier-partnership account McLaren’s Enkei announcement
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What can be said about individual parts?
The public information cited here establishes the broad division—McLaren develops the chassis and car, Mercedes HPP supplies the power unit, and outside firms contribute selected components and production—but it does not publish a reliable part-by-part ledger of design ownership and manufacturing responsibility. A precise claim about who designs or makes every non-power-unit component would go beyond what those sources establish.
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