Light Duty Technology Cost Analysis, Power - US Environmental ...

D.2 Engine System and Cost Summary Overview
D.2.1 Engine Hardware Overview
The Fusion SE is fitted with a conventional 3.0 liter V-6 (Figure D-3) while the Fusion Hybrid
contains an Atkinson 2.5 liter I-4 cylinder engine (Figure D-4). Both Ford Fusion engine
designs featured aluminum blocks and cylinder heads. The induction systems for both engines
have Dual Overhead Cams (DOHC), Variable Valve Timing (VVT), Electronic Throttle Control
(ETC), and Mass Air Flow (MAF) sensors with Intake Air Temperature (IAT) and Manifold
Absolute Pressure (MAP) sensors. Another similarity was the use of single-stage composite
intake manifolds and intake routing paths originating behind the drivers headlamp bucket. Both
engines have Port Fuel Injection (PFI) and Coil on Plug (COP) ignition (I4 has a single knock
sensor, V6 has dual knock sensors).
Figure D-3: 3.0L-V6 installation (Fusion SE)
Aside from displacement and cylinder configurations, differences between the two (2)
engines were found in the valve train: the 3.0L-V6 used direct-acting mechanical buckets
and the 2.5L-I4 utilized roller-finger follower type lifters. Compression ratios also
differed: the 3.0L-V6 was 10.3:1 while the 2.5L-V6 was 12.3:1. Also, as is common in
most hybrid vehicles, the 2.5L-I4 was an Atkinson-Cycle engine for increased efficiency.
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