BMW M3 (E9x) 4.0 V8 S65B40A Engine for Sale
If you’re searching for a true motorsport-inspired engine with legendary status, the BMW M3 (E90/E91/E92/E93) S65B40A delivers something modern engines no longer offer. From 2006 to 2013, BMW M equipped the E9x M3 with this high-revving naturally aspirated V8, creating one of the most iconic performance sedans and coupes ever built.
High-Revving V8 with Pure M DNA
First and foremost, the S65B40A is a 4.0-liter naturally aspirated V8 developed directly from BMW’s Formula 1 engineering philosophy. It produces 309 kW (420 hp) and revs all the way to 8,400 rpm, delivering instant throttle response and an unmistakable V8 sound.
As a result, power builds aggressively with engine speed, rewarding drivers who enjoy precise throttle control and high-rev performance. No turbos, no superchargers—just pure mechanical response.
Engine Specifications at a Glance
| Specification | Details |
|---|---|
| Engine Type | V8, naturally aspirated petrol |
| Displacement | 4.0 liters (3999 cc) |
| Power | 309 kW (420 hp) |
| Fuel Type | Petrol |
| Engine Code | S65B40A |
| Redline | 8,400 rpm |
| Valvetrain | DOHC, 32 valves |
| Character | High-revving, motorsport-inspired |
Designed for Track Performance and Road Use
Next, BMW M engineered the S65 with lightweight internals, individual throttle bodies, and an ultra-rigid crankshaft. Consequently, the engine delivers razor-sharp response and exceptional balance at high rpm.
Paired with either a 6-speed manual or 7-speed DCT, the S65 turns the M3 into a machine that feels equally at home on the track or on fast mountain roads. At the same time, it remains refined enough for everyday driving.
Motorsport Engineering, Proven Legacy
Because the S65 avoids forced induction, it offers mechanical simplicity and a driving experience that modern turbo engines simply can’t replicate. This engine has become highly sought after for restorations, collector builds, premium replacements, and performance exports.
Moreover, its reputation continues to grow as one of BMW M’s greatest engines ever produced.
Compatible BMW Models
| BMW Model | Engine Code | Displacement | Power | Model Years |
|---|---|---|---|---|
| BMW 3 Series (E90) M3 Sedan | S65B40A | 3999 cc | 309 kW | 2006–2011 |
| BMW 3 Series (E91) M3 Touring* | S65B40A | 3999 cc | 309 kW | 2006–2013 |
| BMW 3 Series (E92) M3 Coupe | S65B40A | 3999 cc | 309 kW | 2006–2013 |
| BMW 3 Series (E93) M3 Convertible | S65B40A | 3999 cc | 309 kW | 2008–2013 |
*E91 M3 Touring available as limited / special builds.
Why Choose the BMW S65B40A Engine?
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Legendary naturally aspirated V8
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309 kW (420 hp) with instant throttle response
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8,400 rpm redline for true performance driving
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Motorsport-derived engineering
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Strong demand for collectors and M enthusiasts
One of BMW M’s Greatest Engines Ever Built
In conclusion, the BMW S65B40A is more than just an engine—it’s a milestone in performance history. Whether you’re replacing an original M3 engine, restoring a future classic, or sourcing a high-value powertrain for export, this V8 delivers unmatched character, sound, and driving purity.
