The 1.8-liter Honda R18A gasoline engine was produced by the concern from 2005 to 2014 and was installed on such mass models of the company as the Civic, City, FR-V or the Stream minivan. Now this power unit has already been replaced by its upgraded version under the R18Z index.
In 2006, a new R18 engine was used on the Civic 8 from Honda, which replaced the D17 engine, and on this D-series were no longer installed on Honda cars. The timing for the new engine is driven by a chain, the head has not been changed – all the same 16 valves and 1 camshaft, but the intelligent iVTEC system and dual-mode intake have already been added. The motor does not have hydraulic pushers, so the valves need to be adjusted every 40,000 km. A year later, Honda engineers, based on this engine, released a 2-liter R20A, which was installed on cars higher than the Civic class.
A later R18Z9 version with a compression ratio of 10.6 and 143 PS was installed in the North American Honda HR-V of 2016-2022 model years.
R-series family: R18A, R20A, R16B, R20Z.
Specifications
| Production years | 2005-2014 |
| Displacement, cc | 1799 |
| Fuel system | injector |
| Power output, hp | 140 |
| Torque output, Nm | 175 |
| Cylinder block | aluminum R4 |
| Block head | aluminum 16v |
| Cylinder bore, mm | 81 |
| Piston stroke, mm | 87.3 |
| Compression ratio | 10.5 |
| Features | SOHC |
| Hydraulic lifters | no |
| Timing drive | chain |
| Phase regulator | i-VTEC |
| Turbocharging | no |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 3.7 |
| Fuel type | petrol |
| Euro standards | EURO 4/5 |
| Fuel consumption, L/100 km (for Honda Civic 2008) — city — highway — combined |
8.8 5.5 6.7 |
| Engine lifespan, km | ~280 000 |
| Weight, kg | 105 |
The engine was installed on:
- Honda Civic 8 (FD) in 2005 – 2012;
- Honda City 5 (GM) in 2008 – 2014;
- Honda FR-V 1 (BE) in 2007 – 2009;
- Honda Stream 2 (RN6) in 2006 – 2014;
- Honda HR-V 2 (RU) in 2015 – 2022 (R18Z9, North America).
Disadvantages of the Honda R18A engine
- The power unit is quite demanding on the quality of the fuel and oil used;
- Bad gasoline quickly affects the condition of the catalyst or lambda probes;
- On specialized forums, owners often complain about the very noisy operation of the adsorber valve;
- A modest resource here is the engine mounts and the drive belt tensioner;
- There are no hydraulic lifters and about once every 50 thousand km it is necessary to adjust the valves.
R18A Engine Repair Parts List
| Full name of the part | Part code |
| MOTORBEFESTIGUNG (Civic 2006-) | 50890SMGE02 |
| MOTORBEFESTIGUNG (Civic 2007-) | 50890SMGE03 |
| MOTORBEFESTIGUNG (Civic 2006-) | 50880SMGE01 |
| Intake valve guide bush (4 things per motor) | 12204-PJ7-305 |
| Exhaust valve guide bush (4 things per motor) | 12205-PJ-7305 |
| Intake valve spring (8 things) | 14761RNAA01 |
| Exhaust valve spring (8 things) | 14762RNAA01 |
| Axis of the rocker arms | 14631RNAA00 |
| Camshaft gear | 14211RNAA01 |
| Valve train chain | 14401RNAA01 |
| Head gasket | 12251-RNA-A02 |
| Valve cover gasket | 71-40021-00 |
| Camshaft bed plug Honda R18A1 25x35x17 (12513-P72-003) Eristic (12513-P72-003) | OS6012 |
| Rear crankshaft oil seal (80X98X10 (NOK)) | 91214PWA003 |
| Front crankshaft oil seal (43X58X7 (ARAI)) | 91212-RNA-A01 |
| Front crankshaft oil seal (43X58X7 (NOK)) | 91212RTA003 |
| Oil pressure sensor | 37241RNAA01 |
| Thermostat with gasket (FUJI SEIKO) | 19301RNA305 |
| Thermostat with gasket (NIPPON THERMOSTAT) | 19301RNA306 |
| Intake manifold | 17100RNAA00 |
| Basic liners Honda R16A/R18A (13321-RNA-A02/13341-RNA-A02) Taiho | M457A-STD |
| Connecting rod bushings Honda R16A/R18A (13211-RNA-A02) Taiho | R457A-STD |
| Semi-rings persistent (2 things) | 13331-PNA-004 |
| Complete set of Honda gaskets R18A1 Eristic | EF6560 |
| Gummi motoraufhaengung (Civic 2006) | 50850SMGE01 |
| Starter | 31200RNAA01 |
| Ignition coil (4 things) | 30520RNAA01 |
| Spark plug (4 things) | 9807B561BW |
| Oil filter (Number replacement 15400-RBA-F01) | 15400RTA003 |
| Heater filter / Element filter | 80292SMGE01 |
| Oil nozzle (Double (2 things on the motor)) | 15280RNAA00 |
| Fuel injector (4 things) | 16450RNAA01 |
| Alternator pulley | 31141RNAA01 |
| Crankshaft pulley | 13810RNAA02 |
| Oil dipstick | 15650RNAA00 |
| Fuel tank | 17044SMGE01 |
| Gasoline filling pipe | 17660SMGE01 |
| Gasoline filling pipe | 17660SMGE02 |
| Liquid cooling tube, metal | 19505RNAA00 |
| Ventilation tube | 17137RNAA00 |
| Oil filler cap seal | 15613PC6000 |
| Timing chain damper | 14530RNAA01 |
| Filter | 17048smge00 |
| Air filter/ Element assy, air | 17220RNAA00 |
| Connecting rod (4 things) | 13210RNAA00 |
| Spark plug (4 things) | 9807B561CW |
| Radiator drain plug | 19011PH1621 |
| Middle part of the muffler | 18220SMGE01 |
| Pin Retaining Rings (8 things) | 13115RNAA00 |
| Valve crackers (32 things) | 14781PRBA02 |
| Valve spring plate, upper (16 things) | 14765RGA000 |
| Valve spring plate, lower (16 things) | 14775P08000 |
| Radiator comp | 19010RSAG01 |
| Injector ramp | 16620RNAA01 |
| Expansion tank | 19101RSAG00 |
| V-ribbed belt | 04301RNA305 |
| V-ribbed belt | 31110RSAG02 |
| Belt tensioner pulley | 31190RNA003 |
| Piston pin (4 things) | 13111RNAA00 |
| Piston rings (4 things) | 13021RNAA01 |
| Piston rings (4 things) | 13021RNAA02 |
| Piston rings (4 things) | 13011RNAA02 |
| Piston kit (4 things) | 13010RNAA00 |
| Piston kit (4 things) | 13020RNAA00 |
| Downpipe of the exhaust system | 18210SMGE01 |
| Oil drain plug | 90009PY3000 |
| Intake manifold gasket (4 things) | 17105RNAA01 |
| Rear generator bearing | 31111P08J02 |
| Front generator bearing | 31114P01014 |
| Starter Solenoid Relay | 31204RNAA01 |
| AC generator assy | 31100RNAA01 |
| Cylinder head (“empty”) | 12200RNAA00 |
| Cylinder head (assy) | 10003RNAA00 |
| Inlet valve (8 things) | 14711RNAA00 |
| Exhaust valve (8 things) | 14721P2A000 |
| Timing valve | 15810RNAA01 |
| Valve lid (with gasket) | 12310RNAA01 |
| Crankshaft | 13310RNAA00 |
| Intake valve oil scraper cap (8 things) | 12210P45G01 |
| Exhaust valve oil scraper cap (8 things) | 12211P45G01 |
| Downpipe ring | 18212SM4003 |
| Rocker assembly (4 things) | 14620RNAA01 |
| Air filter housing | 17202RSAG00 |
| Thermostat housing | 19320RNAA00 |
| Coolant radiator cap | 19045RAA003 |
| Expansion tank cap | 19102RNAA00 |
| Lower lambda probe | 36532RNAA01 |
| Oil receiver | 15220RNAA01 |
| Oil pump | 15100RNAA02 |
| Oil pan | 11200RSAG01 |
| Flywheel | 22100RSAL01 |
| Upper gasket set | 06110RNA000 |
| Lower gasket set | 06114RNA010 |
| Coolant pump | 19200RNAA01 |
| Fuel pump | 17045SMGE01 |
| Timing chain tensioner | 14510RNAA01 |
| Neutralizer | 18160RSAG00 |
| Flywheel bushing | 22103RNA004 |
| Motorbefestigung | 50880SMGE02 |
| Knock sensor | 30530RNAA01 |
| Catalyst sensor first (upper) | 36531RNAA01 |
| Mass air flow sensor | 37980RNAA01 |
| Throttle position sensor | 36162RNAA01 |
| Camshaft position sensor | 37510RNAA01 |
| Coolant temperature sensor | 37870PLC004 |
| Fuel level sensor | 17047SMGE01 |
| Throttle valve | 16400RNBA01 |
| Rear muffler | 18307SMGE01 |
| Rear Right Muffler | 18330SMGE02 |
| Fuel filler plug | 17670SJA013 |
| Chain sprocket | 13620RNAA01 |
| Sensor | 37310RSAG01 |
| Short-block (without cylinder head) | 10002RSAG00 |
| Tank for gasoline vapors (Number replacement 17300-SNA-013,17300-SNA-023) | 17300SNA003 |
| Timing chain tensioner shoe | 14520RNAA01 |
| Starter Bendix | 31207PCA003 |
| Cylinder block “empty” | 11000RNAA00 |
| Valve cover bolt (6 things) | 90011RNAA00 |
| Valve cover bolt (2 things) | 90011RSAG00 |
| Flywheel bolt (Transmission 6MT) | 90011PNAB00 |
| Connecting rod bolt (8 things) | 13204RNAA01 |
| Crankshaft pulley bolt | 90017PCX013 |
| Cylinder head bolts (10 things) | 90005RNAA01 |
| Camshaft | 14110RNAA00 |
| Upper main bearing (5 things) | 13321RNAA01 |
| Upper main bearing (5 things) | 13322RNAA01 |
| Upper main bearing (5 things) | 13323RNAA01 |
| Upper main bearing (5 things) | 13324RNAA01 |
| Upper main bearing (5 things) | 13325RNAA01 |
| Upper main bearing (5 things) | 13326RNAA01 |
| Lower main bearing (5 things) | 13341RNAA01 |
| Lower main bearing (5 things) | 13342RNAA01 |
| Lower main bearing (5 things) | 13343RNAA01 |
| Lower main bearing (5 things) | 13344RNAA01 |
| Lower main bearing (5 things) | 13345RNAA01 |
| Lower main bearing (5 things) | 13346RNAA01 |
| Connecting rod bearing (8 things) | 13215RNAA01 |
| Connecting rod bearing (8 things) | 13211RNAA01 |
| Connecting rod bearing (8 things) | 13212RNAA01 |
| Connecting rod bearing (8 things) | 13213RNAA01 |
| Connecting rod bearing (8 things) | 13214RNAA01 |
| Connecting rod bearing (8 things) | 13216RNAA01 |
Frequently asked questions about the Honda R18A
How much power does the Honda R18A make?
The Honda R18A develops 140 hp and 175 Nm of torque.
How much oil does the Honda R18A take and which one?
Engine oil capacity: 3.7 liters. Recommended oil: 5W-30.
Does the Honda R18A have a timing belt or chain?
The Honda R18A uses a timing chain.
Is the Honda R18A turbocharged?
No, the Honda R18A is naturally aspirated.
Does the Honda R18A need valve clearance adjustment?
Yes, there are no hydraulic lifters, so the valve clearances have to be checked and adjusted periodically.
How long does the Honda R18A last?
The typical lifespan of the Honda R18A is ~280 000 km with proper maintenance.
What is the fuel consumption of the Honda R18A?
Honda Civic 2008: city 8.8, highway 5.5, combined 6.7 L/100 km.
What cars was the Honda R18A installed on?
Honda Civic 8 (FD) in 2005 - 2012; Honda City 5 (GM) in 2008 - 2014; Honda FR-V 1 (BE) in 2007 - 2009; Honda Stream 2 (RN6) in 2006 - 2014; Honda HR-V 2 (RU) in 2015 - 2022 (R18Z9, North America).
What are the common problems of the Honda R18A?
The power unit is quite demanding on the quality of the fuel and oil used. Bad gasoline quickly affects the condition of the catalyst or lambda probes. All known problems.
