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Ford Duratec 23 specs: 140 ci (2.3L) 4-cylinder, 3.445 x 3.701 in (87.5 x 94 mm) bore and stroke, 9.7:1 compression. Rated 145-160 hp, 2003–2008.
The Ford Duratec 23 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. A rod ratio of 1.406 is short — higher piston acceleration and more side-load, typical of stroker combinations and a reason to watch piston speed closely. Each of the 4 cylinders displaces 35.0 ci (574 cc).
9.7:1 on iron heads is in the range that usually runs on pump premium; iron holds heat, so treat it as the less forgiving side of that range.
It is one of 24 engines in the Ford 140ci family, all of them 140 ci — the differences between them are in compression, heads and rating, not displacement. 11 factory variants share these dimensions, rated from 145 to 160 hp across 2003–2008.
| Displacement | 140 ci / 2.3 L |
|---|---|
| Bore | 3.4449" |
| Stroke | 3.7008" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9.7:1 * |
| Rod length | 5.205" |
| Rod ratio | 1.406 |
| Bore/stroke ratio | 0.931 |
* Compression ratio from a single source; not yet cross-verified.
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 145–160 hp |
| Years | 2003–2008 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2005 | net | 151 @ 5750 * | 154 lb-ft @ 4250 * | — |
| 2005 | net | 153 @ 5800 | 152 lb-ft @ 4250 | — |
| 2006 | net | 151 @ 5750 | 154 lb-ft @ 4250 | — |
| 2006 | net | 153 @ 5800 | 152 lb-ft @ 4250 | — |
| 2006 | net | 160 @ 6250 | 156 lb-ft @ 4250 | — |
| 2007 | net | 153 @ 5800 | 152 lb-ft @ 4250 | — |
| 2007 | net | 160 @ 6250 | 156 lb-ft @ 4250 | — |
| 2008 | net | 153 @ 5800 | 152 lb-ft @ 4250 | — |
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 |
| Rod ratio | 1.406 — short — more side loading and piston dwell at TDC, typical of stroker combinations |
| Displacement per cylinder | 35.0 ci |
| Static compression | 9.7:1 — 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 |
|---|---|---|
| 2003 | — | Duratec 23 |
| 2004 | 145 hp | Duratec 23 |
| 2005 | 151 hp | Duratec 23 |
| 2005 | 153 hp | Duratec 23 |
| 2006 | 151 hp | Duratec 23 |
| 2006 | 153 hp | Duratec 23 |
| 2006 | 160 hp | Duratec 23 |
| 2007 | 151 hp | Duratec 23 |
| 2007 | 153 hp | Duratec 23 |
| 2007 | 160 hp | Duratec 23 |
| 2008 | 153 hp | Duratec 23 |
4 factory vehicles, 2003–2009. Each year opens that model's engine table.