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Lexus 1AR-FE specs: 2.7L (165 ci) 4-cylinder, 90 x 105 mm (3.5433 x 4.1339 in) bore and stroke, 10:1 compression. Rated 182-185 hp. DOHC.
The Lexus 1AR-FE is undersquare — the 4.1339" stroke exceeds the 3.5433" bore by 14.3% — a layout that trades peak RPM for leverage and torque low in the range. The 4.1339" stroke puts mean piston speed at 4,000 ft/min around 5,800 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 41.3 ci (676 cc).
10:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 5 engines in the AR family, the largest at 165 ci. 2 factory variants share these dimensions, rated from 182 to 185 hp. Factory fitments include the Lexus RX 270, Toyota Venza, Toyota Highlander and 1 other.
| Displacement | 165 ci / 2.7 L |
|---|---|
| Bore | 3.5433" |
| Stroke | 4.1339" |
| Cylinders | 4 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 0.857 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 182–185 hp |
| Bore/stroke character | 0.857 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,134 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 41.3 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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 |
|---|---|---|
| — | 182 hp | 1AR-FE |
| — | 185 hp | 1AR-FE |