BMW B58B30 Specs: 82 x 94.6 mm (3.2283 x 3.7244 in), 320-483 hp

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BMW B58B30 specs: 3.0L (183 ci) 6-cylinder, 82 x 94.6 mm (3.2283 x 3.7244 in) bore and stroke. Rated 320-483 hp, 2016–2026. Used in the BMW 3 Series / M3.

The BMW B58B30 is undersquare — the 3.7244" stroke exceeds the 3.2283" bore by 13.3% — a layout that trades peak RPM for leverage and torque low in the range. The 3.7244" stroke puts mean piston speed at 4,000 ft/min around 6,450 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 30.5 ci (500 cc).

It is one of 8 engines in the BMW 183ci family, all of them 183 ci — the differences between them are in compression, heads and rating, not displacement. 37 factory variants share these dimensions, rated from 320 to 483 hp across 2016–2026.

Dimensions

Displacement183 ci / 3 L
Bore3.2283"
Stroke3.7244"
Cylinders6
ConfigurationI6
Compression ratio10.2–11:1 (published figures vary)
Bore/stroke ratio0.867

Construction

Fuel typegas
Advertised HP320–483 hp
Years2016–2026

Factory ratings by year

YearVersionHP @ rpmTorque @ rpmComp.
2016B58B30 net320 @ 5500330 lb-ft @ 1380—
2017B58B30 net320 @ 5500330 lb-ft @ 1380—
2017B58B30 net335 @ 5500330 lb-ft @ 150011:1
2018B58B30 net320 @ 5500330 lb-ft @ 1380—
2018B58B30 net335 @ 5500330 lb-ft @ 150011:1
2019B58B30 net335 @ 5500330 lb-ft @ 150011:1
2020B58B30 net335 @ 5500330 lb-ft @ 150011:1
2020B58B30 net382 @ 5800369 lb-ft @ 180010.2:1
2020B58B30M1 net389 @ 5000443 lb-ft11:1
2021B58B30 net335 @ 5500330 lb-ft @ 150011:1
2021B58B30 net382 @ 5800369 lb-ft @ 180010.2:1
2021B58B30M1 net389 @ 5000443 lb-ft11:1
2022B58B30 net335 @ 5500330 lb-ft @ 150011:1
2022B58B30 net382 @ 5800369 lb-ft @ 180010.2:1
2022B58B30M1 net389 @ 5000443 lb-ft11:1
2023B58B30 net335 @ 5500330 lb-ft @ 150011:1
2023B58B30 net382 @ 5800369 lb-ft @ 180010.2:1
2023B58B30M1 net389 @ 5000443 lb-ft11:1
2024B58B30 net375 @ 5200398 lb-ft @ 185011:1
2024B58B30 net382 @ 5800369 lb-ft @ 180010.2:1
2024B58B30 net483 @ 5000516 lb-ft11:1
2025B58B30 net375 @ 5200398 lb-ft @ 185011:1
2025B58B30 net382 @ 5800369 lb-ft @ 180010.2:1
2025B58B30 net386 @ 5200398 lb-ft @ 190010.2:1
2025B58B30 net483 @ 5000516 lb-ft11:1
2026B58B30 net375 @ 5200398 lb-ft @ 185011:1
2026B58B30 net382 @ 5800369 lb-ft @ 180010.2:1
2026B58B30 net386 @ 5200398 lb-ft @ 190010.2:1
2026B58B30 net483 @ 5000516 lb-ft11:1

Factory specification sheet.

What these numbers mean

Bore/stroke character0.867 — undersquare — stroke exceeds bore, which favours low-end torque
Mean piston speed at 6,000 RPM3,724 ft/min — in the range typical of performance street engines
Displacement per cylinder30.5 ci

Run the numbers for this engine

Each link opens the calculator with this engine's specs already filled in.

Variants sharing these dimensions (37)

These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.

YearAdvertised HPCode
2016—B58B30
2016320 hpB58B30
2017—B58B30
2017320 hpB58B30
2017335 hpB58B30
2018—B58B30
2018320 hpB58B30
2018335 hpB58B30
2019—B58B30
2019335 hpB58B30
2020335 hpB58B30
2020382 hpB58B30
2020389 hpB58B30
2021335 hpB58B30
2021382 hpB58B30
2021389 hpB58B30
2022335 hpB58B30
2022382 hpB58B30
2022389 hpB58B30
2023—B58B30
2023335 hpB58B30
2023382 hpB58B30
2023389 hpB58B30
2024—B58B30
2024375 hpB58B30
2024382 hpB58B30
2024483 hpB58B30
2025—B58B30
2025375 hpB58B30
2025382 hpB58B30
2025386 hpB58B30
2025483 hpB58B30
2026—B58B30
2026375 hpB58B30
2026382 hpB58B30
2026386 hpB58B30
2026483 hpB58B30

What cars have the B58B30?

6 factory vehicles, 2016–2026. Each year opens that model's engine table.

Similar engines

← All BMW 183ci engines