Honda R engine


The Honda R engine is an inline-four engine launched in 2006 for the Honda Civic. It is fuel injected, has an aluminum-alloy cylinder block and cylinder head, is a SOHC 16-valve design 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 the pistons are treated with molybdenum disulfide applied in a polka-dot pattern. The automatic transmission model is rated at California Air Resources Board ULEV-2 with fuel economy city, and highway. It also uses the same computer 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

The R16 engines all have a bore and stroke of, for an overall displacement of.

R16A

R16B

  • Found in:
  • *2016 Honda Civic
  • ** SOHC iVTEC
  • ** Compression: 10.7:1
  • ** Power: at 6,500 rpm
  • ** Torque: at 4,300 rpm
  • ** Transmission: CVT-7, manual-5
  • ** Redline: 6700 rpm

R18

The R18 engines have a bore and stroke of, for an overall displacement of.

R18A1

R18A2

  • Found in:
  • * 2006–2011 Honda Civic
  • ** Compression: 10.5:1
  • ** Power: at 6,300 rpm
  • ** Torque: at 4,300 rpm
  • ** cruising/economy happens during VTEC under cruising load only.
  • ** Redline: 6800 rpm
  • ** Fuel Cutoff : 7150 rpm

R18A6

R18Z1

  • Found in:
  • *2012–2015 Honda Civic
  • *2016–2020 Honda Civic
  • ** SOHC iVTEC
  • ** Compression: 10.6:1
  • ** Power: at 6,500 rpm
  • ** Torque: at 4,300 rpm
  • ** Redline: 6800
  • ** Fuel cut off: 7100
  • ** Single valve mode at low RPMs
  • ** 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:
  • * 2012–2017 Honda Civic
  • ** Compression: 10.6:1
  • ** Power: at 6,500 rpm
  • ** Torque: 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
  • ** SOHC iVTEC
  • ** Compression: 10.6:1
  • ** Power: at 6,500 rpm
  • ** Torque: at 4,300 rpm

R18Z9

  • Found in:
  • * 2016–2022 Honda HR-V
  • ** Compression: 10.6:1
  • ** Power: at 6,500 rpm
  • ** Torque: at 4,300 rpm

R18ZC


R18ZF

  • Found in:
  • * 2014–2022 Honda HR-V
  • ** Compression: 10.6:1
  • ** Power: at 6,500 rpm
  • ** Torque: at 4,300 rpm

R20

The R20 engines all have a bore and stroke of, for an overall displacement of.

R20A1

  • Found in:
  • * 2007–2011 Honda CR-V
  • * 2008 – Honda Stream
  • * 2013–2015 Acura ILX
  • ** Compression: 10.5:1
  • ** Power: at 6,200 rpm
  • ** Torque: at 4,200 rpm
  • ** Redline: 6800 rpm
  • ** Fuel cut off: 7100 rpm
  • ** SOHC run by timing chain
  • **

R20A2

  • Found in:
  • * 2007–2011 Honda CR-V
  • ** Compression: 10.5:1
  • ** Power: at 6,200 rpm
  • ** Torque: at 4,200 rpm

R20A3

R20A5

  • Found in:
  • * 2012–2015 Honda Civic
  • ** Compression: 10.6:1
  • ** Power: at 6,500 rpm
  • ** Torque: at 4,300 rpm

R20A6

  • Found in:
  • * 2012–2016 – Honda CR-V
  • ** Compression: 10.6:1
  • ** Power: at 6,500 rpm
  • ** Torque: at 4,300 rpm

R20A9

  • Found in:
  • * 2012–2016 – Honda CR-V
  • ** Compression: 10.6:1
  • ** Power: at 6,500 rpm
  • ** Torque: at 4,300 rpm

R20Z1

  • Found in:
  • * 2012–2015 Honda Civic
  • ** SOHC iVTEC
  • ** Compression: 10.6:1
  • ** Power: at 6,500 rpm
  • ** Torque: at 4,300 rpm

R20Z2/R20Z3

  • Found in:
  • * 2013–2017 Honda Accord
  • ** Compression: 10.6:1
  • ** Power: at 6,500 rpm
  • ** Torque:

LF (R20-based hybrid engine)

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

This version includes i-MMD.

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

This version includes i-MMD.

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

This version includes i-MMD.
  • DOHC 16 valve
  • *Displacement:
  • *Bore x Stroke:
  • *Power : / 6,200 rpm
  • *Torque : / 3,500 rpm
  • *Power : / 5,000-6,000 rpm
  • *Torque : / 0–2,000 rpm
  • *Power : / 6,200 rpm
  • Honda CR-V Sport Hybrid e+

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

This version includes i-MMD.

LFC-H4