Ford first introduced the 4.0-litre single-overhead-cam (SOHC) engine in 2001, as a replacement for the over-head-valve (OHV) 4.0-litre. Only the Ranger and Explorer made use of this engine, from 2001 through 2004. In 2005, the Mustang, a staple in Ford's line-up, dropped the 3.8-litre engine in favour of this 4.0 litre. These three vehicles ran with the 4.0 litre through 2010; in 2011 the Mustang and Explorer switched to newer, more powerful, engines, but the 2011 Ranger makes use of the 4.0-litre SOHC.
The 4.0-litre SOHC engine--a V-6 engine--has a bore (cylinder width) of 3.95 inches and a stroke (the distance the piston travels inside the cylinder) of 3.32 inches. The bore and stroke combine to create a total engine displacement of 245 cubic inches. The 4.0 litre has a compression ratio ranging from 9:1 to 9.7:1, depending on the year and model of vehicle. The total valve count of 12 means that there are two valves per cylinder, one intake and one exhaust.
The output number of the 4.0 litre varied slightly depending on which vehicle it was used with. When fitted into the Ford Explorer, this engine produces 210 horsepower at 5,100rpm and 254 foot-pounds of torque at 3,700rpm. In the 2005 through 2010 Ford Mustang, the 4.0 produces 210 horsepower at 5,300rpm and 240 foot-pounds of torque at 3,500rpm. When installed in the Ford Ranger, the 4.0 litre produces its lowest output, 207 horsepower at 5,250rpm and 238 foot-pounds of torque at 3,000rpm.
The fuel economy of this V-6 engine ranged greatly depending on the application. In the Ford Explorer, the 4.0 got 14 to 16mpg in the city and 20 to 21mpg on the highway. In the Ford Ranger, the 4.0-litre got 15 to 17mpg in the city and 19 to 21mpg on the highway. The 2005 through 2010 Mustang used the 4.0-litre most efficiently, getting 17 to 19mpg in the city and 26 to 28mpg on the highway.
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