Honda2006–2012Technical specifications

Civic 1.8 i-VTEC: Technical specifications

Workshop data for the 1.8-litre petrol (engine code R18A1). Covers engine, fluids, brakes, service, torques and air conditioning: the figures to check before a job or a parts order.

Common faults & fixes

Summary

Match the engine code (R18A1) to the vehicle before ordering parts or applying these figures.

Vehicle specifications

Overview

Make: Honda
Model: Civic
Years: 2006–2012
Fuel: Petrol
Engine code: R18A1

Performance & efficiency

Power: 103 kW (140 hp)
Engine size: 1,799 cc
Cylinders: 4 · OHC
Compression ratio: 10.5:1
Fuel system: Honda

Fluids & capacities

Engine oil (with the filter): 3.7-4.2 litres

All 99 specifications below

Engine & identification

Vehicle identification

No. of cylinders Type	4/OHC
Capacity (Fiscal) cc	1799
Compression ratio :1	10,5
Suitable for unleaded petrol	Yes
Minimum octane rating RON	91
Ignition system Make	Honda
Ignition system Type	PGM-FI
Ignition system Description	Map-DI
Trigger location	Cam/Crankshaft
Fuel system Make	Honda
Fuel system Type	PGM-FI
Fuel system Description	MFI-s
Air metering Type	MAP
Combined ignition and fuel ECM	Yes
Diagnostic socket	Yes

Ignition system

Ignition coil supply voltage + with ballast V	12,0

Firing order

The firing order for the Honda Civic 1.8 i-VTEC (2006–2012) is 1-3-4-2.

Firing order	1-3-4-2

Valve clearances

Valve clearances for the Honda Civic 1.8 i-VTEC (2006–2012) are 0,18-0,22 mm inlet and 0,23-0,27 mm exhaust, measured cold.

Valve clearance - INLET mm	0,18-0,22 cold
Valve clearance - EXHAUST mm	0,23-0,27 cold

Engine oil & fluids

Engine oil

The Honda Civic 1.8 i-VTEC (2006–2012) takes 3.7-4.2 litres of engine oil with the filter.

See the reference table for the complete engine oil entries and their conditions.

Manual gearbox

The manual gearbox has a listed capacity of 1.4 litres.

See the reference table for the complete manual gearbox entries and their conditions.

Coolant

See the reference table for the complete coolant entries and their conditions.

Grades, filling conditions and capacities

Lubricants and capacities — complete reference
Engine oil options
Ambient temperature range	All temperatures
Engine oil grade SAE	0W-30, 0W-40 Synthetic
Engine oil classification API/ACEA	SL/A1, A3, A5
Ambient temperature range	All temperatures
Engine oil grade SAE	5W-30, 5W-40 Synthetic
Engine oil classification API/ACEA	SL/A1, A3, A5
Ambient temperature range	-20°C➞
Engine oil grade SAE	10W-30, 10W-40 Synthetic
Engine oil classification API/ACEA	SL/A1, A3, A5
Engine with filter(s) litres	3.7-4.2
Other lubricants and capacities
Manual transmission oil grade SAE	Honda MTF
Manual transmission litres	1.4
Automatic transmission fluid Type	Honda ATF-Z1
Automatic transmission (drain & refill) litres	2.4
Automatic transmission - drain and refill
Automatic transmission (dry fill) litres	5.9
Coolant Type	Honda all season type 2
Cooling system - total capacity litres	6,5 AT=7,1
Brake fluid Type	DOT 4
Clutch fluid Type	DOT 4
Power steering fluid Type	Honda PAS
Power steering fluid litres	0.8-1.1

Brakes & wear limits

Brake disc thickness

Brake discs on the Honda Civic 1.8 i-VTEC (2006–2012) are replaced at a minimum thickness of 19 mm (ventilated) front and 8 mm rear.

Minimum disc thickness
Minimum disc thickness for replacement - ventilated Front	19 mm
Minimum disc thickness for replacement Rear	8 mm
Maximum drum diameter for replacement Rear	201 mm

Brake disc and drum dimensions

Minimum disc thickness
Disc thickness variation Front	0,015 mm
Disc thickness variation Rear	0,015 mm
Disc runout Front	0,10 mm
Disc runout Rear	0,10 mm
Minimum pad thickness Front	1,6 mm
Minimum pad thickness Rear	1,6 mm
Minimum shoe thickness Rear	2 mm

Service & electrical

Tuning and emissions

Ignition timing - basic BTDC °Engine/rpm	8±2/670 Not adjustable
Ignition advance checks °Engine/rpm	ECM Controlled
Idle speed rpm	670±50 Not adjustable
Oil temperature °C	80
CO level at idle speed - tailpipe Vol. % CO	0,2 Max Not adjustable
HC level at idle speed ppm	100
CO2 level at idle speed Vol. % CO2	14,5-16
O2 level at idle speed Vol. % O2	0,1-0,5
Increased idle speed for CO test rpm	2500-2800
CO content at increased idle speed Vol. %	0,2
Lambda at increased idle λ	0,97-1,03

Service checks and adjustments

Compression pressure bar	8,8 Min
Oil pressure bar/rpm	3,4/3000
Radiator cap bar	0,93-1,23
Thermostat opens °C	80-84

Fuel system

System pressure bar	3,8-4,3

Spark plugs

Spark plugs Original equipment	Denso
Spark plug Type	SKJ20DR-M11S
Electrode gap mm	1,0-1,1
Spark plugs Make	NGK
Spark plug Type	IZFR6K11S
Electrode gap mm	1,0-1,1

Tightening torques

Other engine tightening torques
Cylinder head instructions	—
View more information	—
Sump drain bolt	39 Nm
Flywheel/driveplate	—
Flywheel/driveplate
Clutch pressure plate	25 Nm
Crankshaft pulley/damper centre bolt	69 Nm+90°
Camshaft sprocket/gear	56 Nm
Spark plugs	25 Nm
Chassis tightening torques
Front hub	181 Nm
Rear hub - wheel bearing housing bolts	64 Nm
Steering track rod end	54 Nm
Brake disc to hub Front	10 Nm
Brake caliper to carrier Front	34 Nm
Brake caliper to carrier
Brake caliper/carrier to hub Front	108 Nm
Brake disc to hub Rear	10 Nm
Brake caliper to carrier Rear	23 Nm
Brake caliper/carrier to hub Rear	74 Nm
ABS sensor Front	10 Nm
ABS sensor Rear	10 Nm
Road wheels	108 Nm

Air conditioning

No. of AC service connectors	2
Air conditioning restrictor type	Expansion valve
Compressor clutch/magnetic coupling	Yes
Compressor variable displacement solenoid	No
Air conditioning refrigerant Type	R134a
Air conditioning refrigerant quantity grams	475±25 LHD=425±25
Air conditioning oil group	PAG
Air conditioning oil Type	SP10
Air conditioning oil quantity cm³	80±5
Air conditioning oil viscosity ISO	46

Frequently asked questions

What is the firing order of the Honda Civic 1.8 i-VTEC?

The firing order for the Honda Civic 1.8 i-VTEC (2006–2012) is 1-3-4-2.

How much oil does the Honda Civic 1.8 i-VTEC take?

The Honda Civic 1.8 i-VTEC (2006–2012) takes 3.7-4.2 litres of engine oil with the filter. See the reference table for the complete engine oil entries and their conditions.

What are the valve clearances for the Honda Civic 1.8 i-VTEC?

Valve clearances for the Honda Civic 1.8 i-VTEC (2006–2012) are 0,18-0,22 mm inlet and 0,23-0,27 mm exhaust, measured cold.

What is the minimum brake disc thickness for the Honda Civic 1.8 i-VTEC?

Brake discs on the Honda Civic 1.8 i-VTEC (2006–2012) are replaced at a minimum thickness of 19 mm (ventilated) front and 8 mm rear.