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Honda L15B specs: 1.5L (91.3 ci) 4-cylinder, 73 x 89.4 mm (2.8740 x 3.5197 in) bore and stroke. Rated 192 hp, 2018–2026. Used in the Honda Civic. DOHC.
The Honda L15B is undersquare — the 3.5197" stroke exceeds the 2.874" bore by 18.3% — a layout that trades peak RPM for leverage and torque low in the range. The 3.5197" stroke puts mean piston speed at 4,000 ft/min around 6,800 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 22.8 ci (374 cc).
It is one of 8 engines in the L-series family, the largest at 91.3 ci. 9 factory variants share these dimensions, rated at 192 hp across 2018–2026.
| Displacement | 91.3 ci / 1.5 L |
|---|---|
| Bore | 2.874" |
| Stroke | 3.5197" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 10.3–10.6:1 (published figures vary) |
| Bore/stroke ratio | 0.817 |
| Valvetrain | DOHC |
|---|---|
| Fuel type | gas |
| Redline | 6,500 rpm (factory limit) |
| Advertised HP | 192 hp |
| Years | 2018–2026 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2018 | L15B net | 192 @ 5500 | 192 lb-ft @ 1600-5000 | 10.3:1 |
| 2019 | L15B net | 192 @ 5500 | 192 lb-ft @ 1600-5000 | 10.3:1 |
| 2020 | L15B net | 192 @ 5500 | 192 lb-ft @ 1600-5000 | 10.3:1 |
| 2021 | L15B net | 192 @ 5500 | 192 lb-ft @ 1600-5000 | 10.3:1 |
| 2022 | L15B net | 192 @ 5500 | 192 lb-ft @ 1600-5000 | 10.3:1 |
| 2023 | L15B net | 192 @ 6000 | 192 lb-ft @ 1700-5000 | 10.6:1 |
| 2024 | L15B net | 192 @ 6000 | 192 lb-ft @ 1700-5000 | 10.6:1 |
| 2025 | L15B net | 192 @ 6000 | 192 lb-ft @ 1700-5000 | 10.6:1 |
| 2026 | L15B net | 192 @ 6000 | 192 lb-ft @ 1700-5000 | 10.6:1 |
Factory specification sheet.
| Bore/stroke character | 0.817 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,520 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 22.8 ci |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 2018 | 192 hp | L15B |
| 2019 | 192 hp | L15B |
| 2020 | 192 hp | L15B |
| 2021 | 192 hp | L15B |
| 2022 | 192 hp | L15B |
| 2023 | 192 hp | L15B |
| 2024 | 192 hp | L15B |
| 2025 | 192 hp | L15B |
| 2026 | 192 hp | L15B |
2 factory vehicles, 2016–2026. Each year opens that model's engine table.