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Honda L15B7 specs: 1.5L (91.3 ci) 4-cylinder, 73 x 89.4 mm (2.8740 x 3.5197 in) bore and stroke. Rated 174-205 hp, 2016–2021. Used in the Honda Civic. DOHC.
The Honda L15B7 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. 15 factory variants share these dimensions, rated from 174 to 205 hp across 2016–2021.
| 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 |
| Advertised HP | 174–205 hp |
| Years | 2016–2021 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2016 | L15B7 net | 174 @ 6000 | 162 lb-ft @ 1700-5500 | 10.6:1 |
| 2017 | L15B7 net | 174 @ 6000 | 162 lb-ft @ 1700-5500 | 10.6:1 |
| 2017 | L15B7 net | 180 @ 5500 | 177 lb-ft @ 1900-5000 | 10.6:1 |
| 2017 | L15B7 net | 205 @ 5700 | 192 lb-ft @ 2100-5000 | 10.3:1 |
| 2018 | L15B7 net | 174 @ 6000 | 162 lb-ft @ 1700-5500 | 10.6:1 |
| 2018 | L15B7 net | 180 @ 5500 | 177 lb-ft @ 1900-5000 | 10.6:1 |
| 2018 | L15B7 net | 205 @ 5700 | 192 lb-ft @ 2100-5000 | 10.3:1 |
| 2019 | L15B7 net | 174 @ 6000 | 162 lb-ft @ 1700-5500 | 10.6:1 |
| 2019 | L15B7 net | 180 @ 5500 | 177 lb-ft @ 1900-5000 | 10.6:1 |
| 2019 | L15B7 net | 205 @ 5700 | 192 lb-ft @ 2100-5000 | 10.3:1 |
| 2020 | L15B7 net | 174 @ 6000 | 162 lb-ft @ 1700-5500 | 10.6:1 |
| 2020 | L15B7 net | 180 @ 5500 | 177 lb-ft @ 1900-5000 | 10.6:1 |
| 2020 | L15B7 net | 205 @ 5700 | 192 lb-ft @ 2100-5000 | 10.3:1 |
| 2021 | L15B7 net | 174 @ 6000 | 162 lb-ft @ 1700-5500 | 10.6:1 |
| 2021 | L15B7 net | 180 @ 5500 | 177 lb-ft @ 1900-5000 | 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 |
|---|---|---|
| 2016 | 174 hp | L15B7 |
| 2017 | 174 hp | L15B7 |
| 2017 | 180 hp | L15B7 |
| 2017 | 205 hp | L15B7 |
| 2018 | 174 hp | L15B7 |
| 2018 | 180 hp | L15B7 |
| 2018 | 205 hp | L15B7 |
| 2019 | 174 hp | L15B7 |
| 2019 | 180 hp | L15B7 |
| 2019 | 205 hp | L15B7 |
| 2020 | 174 hp | L15B7 |
| 2020 | 180 hp | L15B7 |
| 2020 | 205 hp | L15B7 |
| 2021 | 174 hp | L15B7 |
| 2021 | 180 hp | L15B7 |
1 factory vehicle, 2016–2021. Each year opens that model's engine table.