Honda R engine

R20A

The Honda R engine is an inline-four engine launched in 2006 for the Honda Civic (Non-Si). It is fuel injected, has an aluminum-alloy cylinder block and cylinder head, is a SOHC 16-valve design (four valves per cylinder) and utilizes Honda's i-VTEC system. The R series engine has a compression ratio of 10.5:1, features a "drive by wire" throttle system which is computer controlled to reduce pumping losses and create a smooth torque curve.

The engine uses many advanced technologies to improve fuel economy and reduce friction. Piston rings are given an ion plating and weight is reduced with plastic and aluminum parts and variable length intake manifolds that maintain ram air at a wide RPM range. The engine also features piston cooling jets, previously available only on high performance engines, and in the ninth generation 1.8L Civic (2012 and newer) the pistons are treated with molybdenum disulfide applied in a polka-dot pattern. The automatic transmission model is rated at California Air Resources Board (CARB) ULEV-2 (Ultra Low Emissions Vehicle) with fuel economy 25 mpg_-US (9.4 L/100 km; 30 mpg_-imp) city, and 36 mpg_-US (6.5 L/100 km; 43 mpg_-imp) highway. It also uses the same computer (engine control unit) controlled distributorless coil-on-plug ignition as the Honda K-series engines.

R16

R16A

• Found in:
  • 2006+ Honda Civic (Singapore Local Market FD4, Egypt, Turkey, Cyprus, South Africa (2012-)
    • Displacement: 1,595 cc (97.3 cu in)
    • Compression: 10.5:1
    • Bore & stroke: 81.0 mm × 77.4 mm (3.19 in × 3.05 in)
    • Power: 125 PS (92 kW; 123 bhp) @ 6,200 rpm
    • Torque: 15.6 kgf·m (151 N·m (111 ft·lbf)) @ 4,200 rpm
    • Redline: 6500 rpm

R18

R18A

R18A1

• Found in:
  • 2006+ Honda Civic (JDM Japanese/Pakistani-market FD1, American/Canadian-market FA1 and FG1)
    • Displacement: 1,799 cc (109.8 cu in)
    • Compression: 10.5:1
    • Bore & stroke: 81.0 mm × 87.3 mm (3.19 in × 3.44 in)
    • Power: 140 PS (103 kW; 138 bhp) @ 6300 rpm (Japanese Spec)
    • Torque: 17.7 kgf·m (174 N·m (128 ft·lbf)) @ 4,300 rpm

   Vtec window 1500 - 3500 rpm

• • • Fuel Cut Off: 7150 rpm

R18A2

• Found in:
  • 2012-2014 Honda Civic (European-market FN1 & FK2)
    • Displacement: 1,799 cc (109.8 cu in)
    • Compression: 10.5:1
    • Bore & stroke: 81.0 mm × 87.3 mm (3.19 in × 3.44 in)
    • Power: 140 PS (103 kW; 138 bhp) @ 6,300 rpm
    • Torque: 17.7 kgf·m (174 N·m (128 ft·lbf)) @ 4,300 rpm
    • cruising/economy happens during VTEC under cruising load only.
    • Redline: 7150 rpm

R18Z1

R18Z1 Engine on a Honda Civic FB2

• Found in:
  • 2012- Honda Civic (Southeast Asian FB2)
    • Displacement: 1,799 cc (109.8 cu in)
    • Compression: 10.6:1
    • Bore & stroke: 81.0 mm × 87.3 mm (3.19 in × 3.44 in)
    • Power: 141 PS (104 kW; 139 bhp) @ 6,500 rpm
    • Torque: 17.7 kgf·m (174 N·m (128 ft·lbf)) @ 4,300 rpm

R20

R20A1

• Found in:
  • 2007- Honda CR-V (RE1, RE2)
    2008- Honda Stream (RSZ)
    2013- Acura ILX (DE1)
    • Displacement: 1,997 cc (121.9 cu in)
    • Compression: 10.5:1
    • Bore & stroke: 81.0 mm × 96.9 mm (3.19 in × 3.81 in)
    • Power: 150 PS (110 kW; 148 bhp) @ 6,200 rpm
    • Torque: 19.4 kgf·m (190 N·m (140 ft·lbf)) @ 4,197 rpm

R20A2

• Found in:
  • 2007- Honda CR-V (RE5)
    • Displacement: 1,997 cc (121.9 cu in)
    • Compression: 10.5:1
    • Bore & stroke: 81.0 mm × 96.9 mm (3.19 in × 3.81 in)
    • Power: 150 PS (110 kW; 148 bhp) @ 6,200 rpm
    • Torque: 19.4 kgf·m (190 N·m (140 ft·lbf)) @ 4,200 rpm

R20A3

• Found in:
  • 2008- Honda Accord (CP1)
    • Displacement: 1,997 cc (121.9 cu in)
    • Compression: 10.5:1
    • Bore & stroke: 81.0 mm × 96.9 mm (3.19 in × 3.81 in)
    • Power: 156 PS (115 kW; 154 bhp) @ 6,300 rpm
    • Torque: 19.3 kgf·m (189 N·m (139 ft·lbf)) @ 4,300 rpm
    • Top speed: 215km/h

R20Z1

• Found in:
  • 2012- Honda Civic (FB2)
    • Displacement: 1,997 cc (121.9 cu in)
    • Compression: 10.6:1
    • Bore & stroke: 81.0 mm × 96.9 mm (3.19 in × 3.81 in)
    • Power: 155 PS (114 kW; 153 bhp) @ 6,500 rpm
    • Torque: 19.4 kgf·m (190 N·m (140 ft·lbf)) @ 4,300 rpm

See also

• Honda Engines

References

External links

• Honda Worldwide, Honda Develops New 1.8l i-VTEC Engine
• Honda Worldwide, New 1.8l i-VTEC Engine (Video)