Gas mileage. The 3.5 EcoBoost doesn't do all that well in the MPG department. Ford needed an engine in their trucks that got better gas mileage and would still perform well enough to do 90% of what the bigger engines can do.
As trucks become more family vehicles and DD's vs work trucks, Ford needed to be able to provide and engine that wouldn't cost a fortune to run. Which is why you see so many Lariats with the 2.7
If you look at the engineering design of the 2.7 compared to the 2.3 or even the 3.5, it is dimmensionally built much more like an engine you’d want to rev out to generate a ton of horsepower. The 2.3 has almost a half inch longer stroke than the 2.7 and the cylinder bore is also .15 inches wider on the 2.3 compared to the 2.7. For all intents and purposes, those dimensions alone would suggest a design intent for the 2.3 would be a torque biased motor while the 2.7 would be better to develop as a free revving horsepower monster. Well maybe that’s a stretch for they traditionally refer to the design of the 2.7 as a square engine, while the 2.3 is decidedly under square which is generally the design you’d use for peak torque development. In that regard the 2.3 would’ve been a better choice as a truck motor for fuel economy, as we see throughout fords lineup it develops similar torque figures to the 2.7 while also being lighter, and more fuel efficient.
When the 2.7 got initially announced, I assumed it would completely replace the 3.5 at some point, at least outside of halo cars like the raptor and ford GT, but part of me thinks that it didn’t get the reception ford had been hoping it’d get, which is why the 3.5 (which by comparison is archaic) is getting updated.
Long winded post, but I’ll sum it up, as it’s the same thing I’ve been saying about the bronco: the 2.3 would’ve been plenty of engine for any purpose that ford would use the 2.7 for. While both the 3.5 and 2.3 EBs exist in fords stable, I don’t really understand why the 2.7 is around. The 2.3 gets better fuel economy, the 3.5 generates more power.
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