Gibson GK428 engine

Gibson GK428 [1] [2]
Overview
Manufacturer	Gibson
Production	2017–present
Layout
Configuration	Naturally-aspirated 90° V8
Displacement	4.2 L (256 cu in)
Valvetrain	DOHC
Combustion
Fuel system	Electronic indirect multi-point injection
Management	Cosworth
Fuel type	Elf LMS 102 RON unleaded gasoline E10 ethanol
Output
Power output	603 hp (450 kW)
Torque output	410 lb⋅ft (556 N⋅m)
Dimensions
Dry weight	135 kg (298 lb)
Chronology
Predecessor	Zytek ZG348
Successor	Gibson GL458

The Gibson GK428 engine is a 4.2-litre normally-aspirated DOHC V8 engine. It has been developed and produced by Gibson Technology for sports car racing since 2017. ^{[3] [4]}

Development

The engine had been in development since August 2015, prior to being selected as the sole engine supplier for all of the new 2017 regulation LMP2 cars. ^[5] It shares some architecture with the Zytek ZG348 engine, which previously powered multiple LMP2 cars. ^[6] The engine has a target for the running costs of about $1,400 per hour, which was tested to last for 50 hours or 8,000 km (5,000 mi) on average. ^{[6] [7]} During the 2024 4 Hours of Mugello, the engine reached 5,000,000 km (3,106,856 mi) of running since it was introduced. ^[8]

Applications

• Dallara P217
• Ligier JS P217
• Oreca 07
• Riley-Multimatic MkXXX

References

1. "GK428 (4.2-litre)". gibsontech.co.uk. Retrieved 2 July 2025.
2. "2017 Oreca 07 Gibson Specifications". Ultimatecarpage.com. Retrieved 2 July 2025.
3. Watkins, Gary (16 June 2016). "New LMP2 one-make engine for 2017 WEC breaks cover at Le Mans". autosport.com. Retrieved 2 July 2025.
4. "What goes into a Le Mans engine?". Auto Repair Focus. 4 June 2018. Retrieved 2 July 2025.
5. "Gibson 2017 LMP2 Engine Launched at Le Mans". Federation Internationale de l'Automobile . 16 June 2016. Archived from the original on 12 July 2025. Retrieved 30 December 2025.
6. Magda, Mike (23 August 2016). "Gibson Delivering 2017 Spec LMP2 Engine". EngineLabs. Archived from the original on 12 November 2020. Retrieved 30 December 2025.
7. "Gibson Technology relishing LMP2 challenge". FIA WEC . 13 April 2017. Archived from the original on 21 April 2025. Retrieved 30 December 2025.
8. "5 Million Kilometres with the GK428 engine". Gibson Tech. 1 October 2024. Archived from the original on 10 September 2025. Retrieved 30 December 2025.