Honda F20C engine
These engines are a distant relative to the F-series engines found in the mid 90s Honda Accord and Prelude. To get most out of the compact sized engine, Honda engineers utilized technology derived from Honda's racing engines. The F20C and F22C1 have two overhead cams with roller followers, a ladder-frame main bearing stiffener, a VTEC system for both the intake and exhaust camshaft, Fiber-Reinforced Metal cylinder liners (FRM), molybdenum disulfide-coated piston skirts for reduced friction, and uses a timing chain.
The VTEC system consists of two separate cam lobe profiles. Variable cam phasing is not used. Roller followers are used to reduce friction in the valvetrain. The rocker arms are constructed using metal injection molding.
The engine block is constructed of aluminum with fiber-reinforced metal sleeve. A timing chain drives an intermediate gear, which drives the cams. The pistons are forged aluminum. The intake plenum was designed with minimal volume for fast engine response, and a 14 lb flywheel was fitted until 2003. A high-flow catalyst is supplied along with an exhaust air-injection system, which greatly decreases catalyst light-off time and cold emissions.
- Displacement: 1,997 cc (121.9 cu in)
- Compression: 11.7:1
- Bore: 87 mm (3.4 in)
- Stroke: 84 mm (3.3 in)
- Rod Length: 153 mm
- Rod/stroke ratio: 1.82
- JDM 250 PS (183.88 kW) @ 9,200rpm & 22.2kgm (217.71 Nm) @ 7,500 rpm
- USDM 240 HP @ 8,300 rpm; 153 ft lb, 207 Nm @ 7,500 rpm
- Redline: 8900 rpm
- VTEC: 6100 rpm
The F20C was designed with high maximum rpm capability in mind, for increased power output; redline is at 8900 rpm, with VTEC engagement at 6000 rpm. Its relatively long stroke of 84mm results in a mean piston speed of 4965 ft/m, or 25 m/s, second highest than any other production car to date. It is only beaten by the B7 Audi RS4 (2006-2008). Power output is 240 bhp (179 kW) at 8300 rpm in North America and Europe. The Japanese version, which has a higher compression ratio, is capable of 250 PS (247 bhp) at 8600 rpm. Honda's F20C Engine won a spot on Wards' 10 Best Engines List four times, in 2000, 2001, 2002 and 2003.
- 1999-2005 Honda S2000 (Japan)
- 2000-2003 Honda S2000 (F20C1) (North America)
- 1999–2009 Honda S2000 (United Kingdom, Europe, Australia)
The F20C produces the highest specific power output for any naturally aspirated 2.0L piston engine in a car priced under US$100,000, at 123.5 hp (92.1 kW) per liter, ahead of the SR16VE N1 found in the homologation version of JDM Nissan Pulsar producing 197 bhp (147 kW) for a specific power of 123.45 bhp (92.06 kW) per liter. The F20C held the record for producing the highest specific power output for any mass production naturally aspirated piston engine until Ferrari released the 458 Italia and Porsche the GT3 RS 4.0 in 2010/2011, which produce 124.5 HP/L / 125 HP/L, respectively.
In 2004, Honda produced a stroked 90.7 mm (3.57 in) version of the F20C, increasing displacement by 160 cc (9.8 cu in) to 2,157 cc (131.6 cu in). Dubbed the F22C1, it was originally designed for the North American market being introduced for the 2004 model year. Maximum power output was maintained at 237 hp (177 kW) @7800 rpm. Rated torque increased from 153 lb·ft (207 N·m) at 7500 rpm for the F20C to 162 lb·ft (220 N·m) at 6500 rpm for the F22C. The redline was reduced from 8900 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. In 2006, the engine fully replaced F20C engines in the Japanese market as well which resulted in a drop in rated power output from 250 PS (247 bhp) to 242 PS (239 bhp). Outside of Japan and the United States, the F20C continued to be the only available engine.
- 2004–2009 Honda S2000 (F22C1)(North America)
- 2006–2009 Honda S2000 (Japan)
- "Technology to Increase Power Output of a Low-Emission/High-Efficiency Engine". Spark-Ignition Engine Technology. July 1999. "The model F20C is the upscale version of the F20B which has been the powerplant of the Honda Accord."
- JDM Spec Engines - Honda F20C Engine
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