After Ford VP Barb Samardzich officially announced the 2.0-liter four-cylinder EcoBoost engine for next year, a correspondent for the Examiner.com postulated that this engine was in fact nothing more than a re-badged, smaller version of the 2.3-liter engine from the MazdaSpeed3. Certainly there are similarities in the specs: four cylinders, direct fuel injection, turbocharging, etc. and there has been plenty of collaboration between the two companies. The Mazda CX-9 even uses a version of Ford's 3.7-liter V6.

We checked with Ford and while they have not released many details about the new engine, they did provide some explanation. The EcoBoost, like other recent DuraTec-badged Ford fours, shares a block design with Mazda's similar displacement units. In fact, the EcoBoost block is the same as the Mazda L3T used in the MazdaSpeed3. However, the entire top end of the engine has been redesigned. Like the V6 EcoBoost, the four uses a new direct injection system that is presumably less expensive, allowing Ford to use these engines much more widely than Mazda does.

The Mazda engine also does not have variable valve timing and requires premium fuel. All of the EcoBoost engines are designed to run on regular, although they will get a bit more power with extra octane. The EcoBoost also gets independent variable timing for each of the intake and exhaust cams.

So the two engines are built on the same foundations, but they are not the same engine.

Update: I mis-read the spec table on the MS3 engine and it does indeed have variable valve timing. However, the Ford engine exclusively uses the cam torque actuated system introduced on the revised 3.0-liter V6 last year.

[Sources: Ford, Examiner.com]