R-series
R18A1
R18A1 (8th gen Civic)
Displacement
1.8L (1799cc)
Configuration
Inline-4
Power
140 hp (USDM)
Torque
174 Nm (128 lb-ft) @ 4300 rpm
Compression
10.5:1
Bore × Stroke
81.0 mm x 87.3 mm
Valvetrain
SOHC i-VTEC (economy)
Aspiration
Naturally aspirated
Fuel System
PGM-FI
OBD
OBD2
Redline
6800 rpm
Years
2006-2011
Factory Fitment
Civic DX/LX/EX (FA/FG); Honda Civic FD1/FA1/FG1 (global), Honda FR-V BE1, Honda City, Honda Stream; Civic (FB3, 2012-2015); Civic (FG1, 2006-2011); Civic (FD7, 2006-2011); Civic (FD1, 2006-2011); Civic (FA1, 2006-2011)
Notes
Economy engine; relevant to maintenance guides rather than performance swaps.
Swaps using the R18A1
Guides mentioning the R18A1
Difficult
1-2 days
Civic Type R 5-Lug Brake and Suspension Conversion for the 1996-2000 Civic (EK)
Easy
15-30 minutes
Honda PGM-FI Fault Code Reading and ECU Reset (OBD0/OBD1/OBD2)
Expert
6-10 hours (excluding paint and parts lead time)
Honda Fit (GE8) JDM 11-Pin Folding, Heated Door Mirror Retrofit
Difficult
6-10 hours
Honda Prelude (4th Gen) Projector Headlight Retrofit
Difficult
3-4 hours
Third-Generation Acura Integra Coilover, Shock, and Spring Installation
Moderate
1-2 hours
Honda Civic 2.2 i-CTDi Diesel EGR Valve Removal and Cleaning
Difficult
4-6 hours
Honda Fit (GE8) LED Taillight and Rear Fog Light Retrofit
Difficult
3-4 hours
Honda Fit (GE8) HomeLink and Ambient Light Retrofit Using an Acura TSX Overhead Console
Moderate
4-6 hours (plus sealant cure time)
DIY Amber City Lights in Honda Headlight Housings
Expert
About 1 week (5 working days)
Honda Civic (8th Gen, R18) Engine Bay Wire Tuck
Moderate
3-4 hours
TSX Front Brake Upgrade for the 8th-Generation Honda Civic (LX/EX)
Difficult
3-5 hours
Diagnosing Dead ECT, CMP and Wideband O2 Signals After a K-Series Conversion Harness Swap