Honda F20C engine
These engines are unrelated to the F-series engines found in the mid 90s Honda Accord and Prelude. They share many properties with the K-series. These engines, unlike most F-series engines, have two counter-rotating overhead cams, a VTEC system for both the intake and exhaust camshaft, carbon-fiber reinforced cylinder liners (FRM), molybdenum disulfide-coated piston skirts for reduced friction, and uses a more modern chain driven valvetrain as opposed to a belt driven system.
The F20C was designed with high maximum rpm in mind, for increased power output; redline is at 9000 rpm, with VTEC engagement at 6000 rpm. Power output is Template:Convert/bhp at 8300 rpm in North America and Europe. The Japanese version, which has a higher compression ratio, is capable of Template:Convert/PS at 8600 rpm. Honda's F20C Engine won a spot on Wards' 10 Best Engines List four times, in 2000, 2001, 2002 and 2003.
The F20C's bore is 87 mm (3.4 in) and stroke is 84 mm (3.3 in).
- 1999-2003 Honda S2000 (North America)
- 1999-2005 Honda S2000 (Japan)
- 1999-present Honda S2000 (United Kingdom, Europe, Australia)
The F20C produces the highest specific power for any naturally aspirated piston engine in a car worth less than US$100,000, at Template:Convert/bhp per liter, ahead of the 1.6 L (98 cu in) Honda B16B engine found in the 1996-2000 Honda Civic Type R producing Template:Convert/bhp for a specific power of Template:Convert/bhp per liter.
In 2004, Honda produced a stroked 90.7 mm (3.57 in) version of the F20C, increasing displacement by Template:Convert/LonAonDbSoff to Template:Convert/LonAonDbSoff. Dubbed the F22C1, it was originally designed for the North American market being introduced for the 2004 model year. Rated torque increased from Template:Convert/ft.lbf at 7500 rpm for the F20C to Template:Convert/ft.lbf at 6200 rpm for the F22C. The redline was reduced from 9000 rpm to 8000 rpm, mandated by the longer travel distance of the pistons. Peak horsepower output is rated identical to the F20C.
The F22C1 was used exclusively in the North American market for 2004 and 2005 with the F20C being used in all other markets. Despite the displacement increase, the car to which the F22C1 is mated retains the name of Honda S2000. In 2006, the engine fully replaced F20 engines in the Japanese market as well which resulted in a drop in rated power output from Template:Convert/PS to Template:Convert/PS due to compression being reduced from 11.7:1 to 11.0:1. The UK, European, and Australian markets are currently the only areas in which the S2000 retains the F20C.
- 2004-present Honda S2000 (North America)
- 2006-present Honda S2000 (Japan)