See other engines in this family
GMC LWN specs: 170 ci (2.8L) 4-cylinder, 3.701 x 3.937 in (94 x 100 mm) bore and stroke. Rated 181 hp, 2016–2022. DOHC. Rod ratio and piston speed worked out.
The GMC 169ci (LWN) is undersquare — the 3.937" stroke exceeds the 3.701" bore by 6.0% — a layout that trades peak RPM for leverage and torque low in the range. The 3.937" stroke puts mean piston speed at 4,000 ft/min around 6,100 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 42.5 ci (696 cc).
13 factory variants share these dimensions, rated at 181 hp across 2016–2022.
| Displacement | 170 ci / 2.8 L |
|---|---|
| Bore | 3.701" |
| Stroke | 3.937" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.94 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | diesel |
| Advertised HP | 181 hp |
| Years | 2016–2022 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2016 | LWN net | 181 @ 3400 * | 369 lb-ft @ 2000 * | — |
| 2017 | LWN net | 181 @ 3400 * | 369 lb-ft @ 2000 * | — |
| 2018 | LWN net | 181 @ 3400 * | 369 lb-ft @ 2000 * | — |
| 2019 | LWN net | 181 @ 3400 * | 369 lb-ft @ 2000 * | — |
| 2020 | LWN net | 181 @ 3400 * | 369 lb-ft @ 2000 * | — |
| 2021 | LWN net | 181 @ 3400 * | 369 lb-ft @ 2000 * | — |
| 2022 | LWN net | 181 @ 3400 * | 369 lb-ft @ 2000 * | — |
Factory specification sheet. * Not yet cross-verified.
| Bore/stroke character | 0.940 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,937 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 42.5 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 | 181 hp | LWN |
| 2017 | — | LWN |
| 2017 | 181 hp | LWN |
| 2018 | — | LWN |
| 2018 | 181 hp | LWN |
| 2019 | — | LWN |
| 2019 | 181 hp | LWN |
| 2020 | — | LWN |
| 2020 | 181 hp | LWN |
| 2021 | — | LWN |
| 2021 | 181 hp | LWN |
| 2022 | — | LWN |
| 2022 | 181 hp | LWN |