BMW S14 Engine Project & Getrag 5-Speed Gearbox | 2.3L Inline-Four | E30 M3 Original Powertrain

Offered here is a BMW S14 2.3-liter inline-four engine project paired with a Getrag 5-speed manual gearbox, removed from a 1990 BMW E30 M3. This is a genuine M3 drivetrain — the same legendary configuration that powered BMW’s Group A touring cars and helped define the brand’s motorsport legacy.

This BMW 2.3-liter S14B inline-four and Getrag five-speed manual gearbox were removed from the seller’s 1990 E30 M3 after a rod bearing spun and damaged the engine in 2003. The engine was stored around 20 years and has been partially disassembled. Details include a cast-iron block, an aluminum cylinder head, dual overhead camshafts, and a black-finished intake plenum with “BMW M Power” lettering. The gearbox is accompanied by a clutch.

The engine suffered a spun rod bearing in 2003 and was subsequently removed from service. It has since been stored for approximately 20 years and remains partially disassembled, making it an ideal base for a complete rebuild or restoration project.

Technical Specifications

Included Components

BMW S14B23 Engine (Core) – Partially disassembled, ideal for restoration or rebuild
Cast-Iron Engine Block – Original M3 specification
Aluminum Cylinder Head – Complete with camshafts
Black “BMW M Power” Intake Plenum – Signature M design with individual throttle bodies
Getrag 5-Speed Manual Gearbox – Original E30 M3 transmission
Clutch Assembly – Included with gearbox
Assorted Hardware and Fasteners – Stored with the engine components

Condition Notes

• Engine suffered rod bearing failure before removal in 2003

• Has been stored indoors for roughly two decades

• Partially disassembled for inspection and preservation

• No visible corrosion or external damage noted on major castings

• Gearbox turns freely and includes matching clutch unit

• Recommended for complete rebuild or race restoration project

Compatibility

 BMW M3 (E30) 1986–1991
 Suitable for E30 M3 restorations, race builds, or collector projects
 Can be adapted for use in retro racing or custom M Power swaps

Collector Significance

The BMW S14 is one of the most celebrated naturally aspirated four-cylinder engines ever built — derived from the legendary M10 block and S38 head architecture used in BMW’s Group A and DTM cars.
Its high-revving nature, distinctive intake sound, and direct motorsport lineage make it an icon among BMW enthusiasts.

This particular unit, paired with its original Getrag 5-speed gearbox, represents an authentic foundation for a numbers-matching restoration, track car rebuild, or investment-grade M3 project.

BMW S14 Engine Project & Getrag 5-Speed Gearbox — a genuine E30 M3 powertrain, stored for two decades and ready for a new life in a rebuild or restoration project.
Featuring its original BMW M Power plenum, DOHC 16-valve head, and matching gearbox with clutch, this is an exceptional base for anyone looking to restore or recreate the legendary M3 performance experience.