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Ford Duratec 35 specs: 213.4 ci (3.5L) 6-cylinder, 3.642 x 3.413 in (92.5 x 86.7 mm) bore and stroke, 10.3:1 compression. Rated 262-287 hp, 2007–2019.
The Ford Duratec 35 is oversquare — the 3.6417" bore exceeds the 3.4134" stroke by 6.7% — a layout that favors airflow and RPM over leverage at the crank. The 3.4134" stroke does not reach 4,000 ft/min of mean piston speed until about 7,050 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 35.6 ci (583 cc).
10.3:1 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 17 engines in the Cyclone V6 family, the largest at 213.4 ci. 28 factory variants share these dimensions, rated from 262 to 287 hp across 2007–2019.
| Displacement | 213.4 ci / 3.5 L |
|---|---|
| Bore | 3.6417" |
| Stroke | 3.4134" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 10.3:1 |
| Bore/stroke ratio | 1.067 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Firing order | 1-4-2-5-3-6 |
| Advertised HP | 262–287 hp |
| Years | 2007–2019 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2007 | net | 265 @ 6250 | 250 lb-ft @ 4500 | — |
| 2008 | net | 263 @ 6250 | 249 lb-ft @ 4500 | — |
| 2008 | net | 265 @ 6250 | 250 lb-ft @ 4500 | — |
| 2009 | net | 262 @ 6250 | 248 lb-ft @ 4500 | — |
| 2009 | net | 263 @ 6250 | 249 lb-ft @ 4500 | — |
| 2009 | net | 265 @ 6250 | 250 lb-ft @ 4500 | — |
| 2010 | net | 262 @ 6250 | 248 lb-ft @ 4500 | — |
| 2010 | net | 263 @ 6250 | 249 lb-ft @ 4500 | — |
| 2010 | net | 265 @ 6250 | 250 lb-ft @ 4500 | — |
| 2011 | net | 262 @ 6250 | 248 lb-ft @ 4500 | — |
| 2011 | net | 263 @ 6250 | 249 lb-ft @ 4500 | — |
| 2011 | net | 285 @ 6500 | 253 lb-ft @ 4000 | — |
| 2012 | net | 262 @ 6250 | 248 lb-ft @ 4500 | — |
| 2012 | net | 263 @ 6250 | 249 lb-ft @ 4500 | — |
| 2012 | net | 285 @ 6500 | 253 lb-ft @ 4000 | — |
| 2013 | net | 285 @ 6500 | 253 lb-ft @ 4000 | — |
| 2013 | net | 287 @ 6500 | 254 lb-ft @ 4000 | — |
| 2014 | net | 285 @ 6500 | 253 lb-ft @ 4000 | — |
| 2014 | net | 287 @ 6500 | 254 lb-ft @ 4000 | — |
| 2015 | net | 280 @ 6500 | 250 lb-ft @ 4000 | — |
| 2015 | net | 287 @ 6500 | 254 lb-ft @ 4000 | — |
| 2016 | net | 280 @ 6500 | 250 lb-ft @ 4000 | — |
| 2016 | net | 287 @ 6500 | 254 lb-ft @ 4000 | — |
| 2017 | net | 280 @ 6500 | 250 lb-ft @ 4000 | — |
| 2017 | net | 287 @ 6500 | 254 lb-ft @ 4000 | — |
| 2018 | net | 280 @ 6500 | 250 lb-ft @ 4000 | — |
| 2018 | net | 287 @ 6500 | 254 lb-ft @ 4000 | — |
| 2019 | net | 287 @ 6500 | 254 lb-ft @ 4000 | — |
Factory specification sheet.
| Bore/stroke character | 1.067 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,413 ft/min — conservative for a street engine |
| Displacement per cylinder | 35.6 ci |
| Static compression | 10.3:1 — 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 |
|---|---|---|
| 2007 | 265 hp | Duratec 35 |
| 2008 | 263 hp | Duratec 35 |
| 2008 | 265 hp | Duratec 35 |
| 2009 | 262 hp | Duratec 35 |
| 2009 | 263 hp | Duratec 35 |
| 2009 | 265 hp | Duratec 35 |
| 2010 | 262 hp | Duratec 35 |
| 2010 | 263 hp | Duratec 35 |
| 2010 | 265 hp | Duratec 35 |
| 2011 | 262 hp | Duratec 35 |
| 2011 | 263 hp | Duratec 35 |
| 2011 | 285 hp | Duratec 35 |
| 2012 | 262 hp | Duratec 35 |
| 2012 | 263 hp | Duratec 35 |
| 2012 | 285 hp | Duratec 35 |
| 2013 | 285 hp | Duratec 35 |
| 2013 | 287 hp | Duratec 35 |
| 2014 | 285 hp | Duratec 35 |
| 2014 | 287 hp | Duratec 35 |
| 2015 | 280 hp | Duratec 35 |
| 2015 | 287 hp | Duratec 35 |
| 2016 | 280 hp | Duratec 35 |
| 2016 | 287 hp | Duratec 35 |
| 2017 | 280 hp | Duratec 35 |
| 2017 | 287 hp | Duratec 35 |
| 2018 | 280 hp | Duratec 35 |
| 2018 | 287 hp | Duratec 35 |
| 2019 | 287 hp | Duratec 35 |
7 factory vehicles, 2007–2019. Each year opens that model's engine table.