Honda R engine explained

Honda R engine
Manufacturer:	Honda Motor Co Ltd
Production:	2006–present
Configuration:	Naturally aspirated Straight-4
Displacement:	NaNcc
Bore:	812NaN2
Stroke:	77.42NaN2 87.32NaN2 96.92NaN2
Valvetrain:	SOHC 4 valves x cyl. with i-VTEC DOHC 4 valves x cyl. with i-VTEC (LF Hybrid engine)
Fuelsystem:	PGM-FI
Fueltype:	Gasoline
Coolingsystem:	Water-cooled
Block:	Aluminum alloy
Head:	Aluminum alloy
Compression:	10.5:1-10.7:1
Redline:	6800
Power:	NaNPS
Torque:	NaN0NaN0

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 (2012-2015) 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 25mpgus city, and 36mpgus highway. It also uses the same computer (engine control unit) controlled distributorless coil-on-plug ignition as the Honda K-series engines. As of September 2019, the R series engines were only offered outside of Japan.

R16

R16A

• Found in:
  • 2006 Honda Civic (Singapore, Egypt, Turkey Market – FA1/FD series)
  • 2012 Honda Civic (Singapore, Egypt, Turkey Market – FB series)
    • Displacement: 1595cc
    • SOHC iVTEC (Chain driven cam)
    • Compression: 10.5:1
    • Bore & stroke: 81x
    • Power: 1250NaN0 at 6,500 rpm
    • Torque: 15.40NaN0 at 4,300 rpm
    • Transmission: 5-speed
    • Redline: 6800 rpm

R16B

• Found in:
  • 2016 Honda Civic (Mauritius, Singapore, Egypt, Turkey, Cyprus, South Africa, Ukraine and Brunei – FC series)
    • Displacement: 1597cc
    • SOHC iVTEC (Chain driven cam)
    • Compression: 10.7:1
    • Bore & stroke: 81x
    • Power: 1250NaN0 at 6,500 rpm
    • Torque: 15.60NaN0 at 4,300 rpm
    • Transmission: CVT-7
    • Redline: 6700 rpm

R18

R18A1

• Found in:
  • 2006–2011 Honda Civic (South Africa/Thailand/Malaysia/Indonesia/Philippines/Taiwan/Japan/Indian-market FD1, Brazil, American/Canadian-market FA1 & FG1)
  • 2007–2009 Honda FR-V (European-market BE1)
  • 2008-2015 Honda City
  • 2007-2014 Honda Stream
    • Displacement: 1799cc
    • SOHC iVTEC (Chain driven cam)
    • Compression: 10.5:1
    • Bore & stroke: 81x
    • Power: 1410NaN0 at 6300 rpm (Japanese Spec)
    • Torque: 17.70NaN0 at 4,300 rpm
    • Fuel Cut Off: 6900 rpm
    • Redline: 6800 rpm

R18A2

• Found in:
  • 2006–2011 Honda Civic (European-market FN1 & FK2)
    • Displacement: 1799cc
    • Compression: 10.5:1
    • Bore & stroke: 81x
    • Power: 1400NaN0 at 6,300 rpm
    • Torque: 17.70NaN0 at 4,300 rpm
    • cruising/economy happens during VTEC under cruising load only.
    • Redline: 6800 rpm
    • Fuel Cutoff : 7150 rpm

R18A6

• Found in:
  • 2006–2011 Honda Civic (Brazil)
  • Local Fuel optimization (FlexFuel - Ethanol or Gasoline)
  • Power: 140HP
  • SOHC i-VTEC (ECO Version)
  • Redline: 6800 rpm

R18Z1

• Found in:
  • 2012–2015 Honda Civic (FB2, FG3)
  • 2016–2020 Honda Civic (FC6, FK5)
    • Displacement: 1799cc
    • SOHC iVTEC (Chain driven cam)
    • Compression: 10.6:1 (performance benefits from higher octane fuel)
    • Bore & stroke: 81x
    • Power: 1450NaN0 at 6,500 rpm
    • Torque: 17.80NaN0 at 4,300 rpm
    • Redline: 6800
    • Fuel cut off: 7100
    • Single valve mode at low RPMs
    • iVTEC engages economy cam profile from 1000 rpm to 3500 rpm, under light engine load. Engine runs on low power cam profile by default.

R18Z4

• Found in:
  • 2012-2016 – Honda Civic (European-market FK2)
    • Displacement: 1798cc
    • Compression: 10.6:1
    • Bore & stroke: 81x
    • Power: 1450NaN0 at 6,500 rpm
    • Torque: 17.80NaN0 at 4,300 rpm
    • Redline: 6800 rpm
    • Fuel cut off : 7100 rpm
    • cruising/economy happens during VTEC under cruising load only.
    • Balancer Shaft on this R18.

R18Z6

• Found in:
  • 2013-2017 – Honda Jade
    • Displacement: 1799cc
    • SOHC iVTEC (Chain driven cam)
    • Compression: 10.6:1
    • Bore & stroke: NaN2NaN2
    • Power: 1410NaN0 at 6,500 rpm
    • Torque: 17.70NaN0 at 4,300 rpm

R18Z9

• Found in:
  • 2016 – Honda HR-V
    • Displacement: 1799cc
    • Compression: 10.6:1
    • Bore & stroke: 81x
    • Power: 1430NaN0 at 6,500 rpm
    • Torque: 17.70NaN0 at 4,300 rpm

R18ZF

• Found in:
  • 2014 – Honda HR-V (Thailand and Indonesia)^[1]
    • Displacement: 1799cc
    • Compression: 10.6:1
    • Bore & stroke: 81x
    • Power: 1430NaN0 at 6,500 rpm
    • Torque: 17.50NaN0 at 4,300 rpm

R20

R20A1

• Found in:
  • 2007–2011 Honda CR-V (RE1, RE2)
  • 2008 – Honda Stream (RSZ)
  • 2013-2015 Acura ILX (DE1)
    • Displacement: 1997cc
    • Compression: 10.5:1
    • Bore & stroke: 81x
    • Power: 1520NaN0 at 6,200 rpm
    • Torque: 19.40NaN0 at 4,200 rpm
    • Redline: 6800 rpm
    • Fuel cut off: 7100 rpm
    • SOHC run by timing chain
    • iVTEC engages economy cam profile from 1000 rpm to 3500 rpm, under light engine load. Engine runs on power cam profile by default

R20A2

• Found in:
  • 2007–2011 Honda CR-V (RE5)
    • Displacement: 1997cc
    • Compression: 10.5:1
    • Bore & stroke: 81x
    • Power: 1520NaN0 at 6,200 rpm
    • Torque: 19.40NaN0 at 4,200 rpm

R20A3

• Found in:
  • 2008–2012 Honda Accord (CP1) (156 hp)
  • 2008–2015 Honda Accord (CU1/CN1/CW1) (156 hp)
  • 2013–2020 Proton Perdana (CP3) (156 hp)
    • Displacement: 1997cc
    • Compression: 10.5:1
    • Bore & stroke: 81x
    • Power: 1570NaN0 at 6,300 rpm
    • Torque: 19.20NaN0 at 4,300 rpm

R20A5

• Found in:
  • 2012–2015 Honda Civic (Southeast Asian FB3)
    • Displacement: 1997cc
    • Compression: 10.6:1
    • Bore & stroke: 81x
    • Power: 1570NaN0 at 6,500 rpm
    • Torque: 19.40NaN0 at 4,300 rpm

R20A6

• Found in:
  • 2012-2016 – Honda CR-V (RM1, RM2)
    • Displacement: 1997cc
    • Compression: 10.6:1
    • Bore & stroke: 81x
    • Power: 1570NaN0 at 6,500 rpm
    • Torque: 19.40NaN0 at 4,300 rpm

R20A9

• Found in:
  • 2012-2016 – Honda CR-V (RE6)
    • Displacement: 1997cc
    • Compression: 10.6:1
    • Bore & stroke: 81x
    • Power: 1570NaN0 at 6,500 rpm
    • Torque: 19.40NaN0 at 4,300 rpm

R20Z1

• Found in:
  • 2012–2015 Honda Civic (FB3)
    • Displacement: 1997cc
    • SOHC iVTEC (Chain driven cam)
    • Compression: 10.6:1
    • Bore & stroke: 81x
    • Power: 1550NaN0 at 6,500 rpm
    • Torque: 19.40NaN0 at 4,300 rpm

R20Z2/R20Z3

• Found in:
  • 2013–2017 Honda Accord (CR1)
    • Displacement: 1997cc
    • Compression: 10.6:1
    • Bore & stroke: 81x
    • Power: 1550NaN0 at 6,500 rpm
    • Torque: 19.40NaN0

LF (R20-based hybrid engine)

LFA1 (i-VTEC + Sport Hybrid i-MMD)

This version includes i-MMD ("Intelligent Multi Mode Drive").

• DOHC 16 valve
  • Displacement: 1993cc
  • Bore x Stroke: NaN2NaN2
  • Power (Engine): 1450NaN0 / 6,200 rpm
  • Torque (Engine): 1750NaN0 / 3,500 rpm
  • Power (Motor): 1840NaN0 / 5,000-6,000 rpm
  • Torque (Motor): 3150NaN0 / 0–2,000 rpm
  • Power (Combined): 2150NaN0 / 6,200 rpm
    • Honda Odyssey Hybrid/e:HEV (Japan, RC4)^[2]
• Honda Stepwgn Hybrid/e:HEV (Japan, RP5)^[3]
• Honda Accord hybrid (N. America) (2014 - 2022)^[4]
• Honda CR-V hybrid (N. America) (2020 - 2022)^[4]

LFB1 (i-VTEC + Sport Hybrid i-MMD)

This version includes i-MMD ("Intelligent Multi Mode Drive").

• DOHC 16 valve
  • Displacement: 1993cc
  • Bore x Stroke: NaN2NaN2
  • Power (Engine): 1450NaN0 / 6,200 rpm
  • Torque (Engine): 1750NaN0 / 3,500 rpm
  • Power (Motor): 1840NaN0 / 5,000-6,000 rpm
  • Torque (Motor): 3150NaN0 / 0–2,000 rpm
  • Power (Combined): 2150NaN0 / 6,200 rpm
• Honda Accord Hybrid (Thailand, CV3)^[5]
• Honda Odyssey e:HEV Absolute (International, RC4)

LFB-13 (i-VTEC + Sport Hybrid i-MMD, e:PHEV)

This version includes i-MMD ("Intelligent Multi Mode Drive").

• DOHC 16 valve
  • Displacement: 1993cc
  • Bore x Stroke: NaN2NaN2
  • Power (Engine): 1450NaN0 / 6,200 rpm
  • Torque (Engine): 1750NaN0 / 3,500 rpm
  • Power (Motor): 1840NaN0 / 5,000-6,000 rpm
  • Torque (Motor): 3150NaN0 / 0–2,000 rpm
  • Power (Combined): 2150NaN0 / 6,200 rpm
• Honda CR-V Sport Hybrid e+ (China)

LFB-H4 (i-VTEC + Sport Hybrid i-MMD)

This version includes i-MMD ("Intelligent Multi Mode Drive").

• DOHC 16 valve
  • Displacement: 1993cc
  • Bore x Stroke: NaN2NaN2
  • Power (Engine): 1450NaN0 / 6,200 rpm
  • Torque (Engine): 1750NaN0 / 3,500 rpm
  • Power (Motor): 1840NaN0 / 5,000–6,000 rpm
  • Torque (Motor): 3150NaN0 / 0–2,000 rpm
  • Power (Combined): 2150NaN0 / 6,200 rpm
• Honda Accord Hybrid/e:HEV (Japan, CV3)^[6]
• Honda CR-V Hybrid/e:HEV (Japan, RT5–RT6)^[7]
• Honda Odyssey Hybrid/e:HEV (Japan, RC4)

LFC-H4

• DOHC 16 valve
  • Displacement: 1993cc
  • Bore x Stroke: NaN2NaN2
  • Power (Engine): 1410NaN0 / 6,000 rpm
  • Torque (Engine): 1820NaN0 / 4,500 rpm
  • Power (Motor): 1840NaN0 / 5,000–6,000 rpm
  • Torque (Motor): 3150NaN0 / 0–2,000 rpm
• Honda Civic e:HEV (Japan/Europe, FL4/Thailand, FE4)
• Honda ZR-V e:HEV (Australia, RZ4/6)

See also

• Honda Engines

External links

• Honda Worldwide, Honda Develops New 1.8l i-VTEC Engine
• Honda Worldwide, New 1.8l i-VTEC Engine (Video)
• Discussion and testing of higher octane fuel with Honda R18 engine

Notes and References

1. http://www.car.go.th//api/render/tagImageEcoA4grayCT/3124835fdaf7497bb7c0700143d7662a Car Thailand
2. Web site: Odyssey Spec List. Honda (Japan). ja.
3. Web site: Stepwgn Spec List. Honda (Japan). ja.
4. Honda Two-Motor Hybrid-Electric System . 15 June 2024 . 30 January 2023.
5. Web site: ECO sticker - Honda Accord Hybrid TECH. ECO sticker - The Office of Industrial Economics, Ministry of Industry Thailand. th. 2020-01-18.
6. Web site: Accord Spec List. Honda (Japan). ja. 2020-08-26.
7. Web site: CR-V Spec List. Honda (Japan). ja. 2020-08-26.