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Mazda Ford Duratec 2.3 specs: 2.261L (138 ci) 4-cylinder, 87.5 x 94 mm (3.4449 x 3.7008 in) bore and stroke. Rated 135-143 hp, 2001–2009.
The Mazda Ford Duratec 2.3 is undersquare — the 3.7008" stroke exceeds the 3.4449" bore by 6.9% — a layout that trades peak RPM for leverage and torque low in the range. The 3.7008" stroke puts mean piston speed at 4,000 ft/min around 6,500 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 34.5 ci (565 cc).
It is one of 14 engines in the MZR family, sitting between the 122 ci and 152 ci members. 9 factory variants share these dimensions, rated from 135 to 143 hp across 2001–2009.
| Displacement | 138 ci / 2.261 L |
|---|---|
| Bore | 3.4449" |
| Stroke | 3.7008" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.931 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 135–143 hp |
| Years | 2001–2009 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2002 | Ford Duratec 2.3 net | 135 @ 5050 * | 153 lb-ft @ 3750 * | — |
| 2009 | Ford Duratec 2.3 net | 143 @ 5250 * | 154 lb-ft @ 3750 * | — |
Factory specification sheet. * Not yet cross-verified.
| Bore/stroke character | 0.931 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,701 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 34.5 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 |
|---|---|---|
| 2001 | 135 hp | Ford Duratec 2.3 |
| 2002 | 135 hp | Ford Duratec 2.3 |
| 2003 | 143 hp | Ford Duratec 2.3 |
| 2004 | 143 hp | Ford Duratec 2.3 |
| 2005 | 143 hp | Ford Duratec 2.3 |
| 2006 | 143 hp | Ford Duratec 2.3 |
| 2007 | 143 hp | Ford Duratec 2.3 |
| 2008 | 143 hp | Ford Duratec 2.3 |
| 2009 | 143 hp | Ford Duratec 2.3 |
1 factory vehicle, 2001–2009. Each year opens that model's engine table.