The engine name is Honda R18A1, the 1.8-liter i-VTEC inline-4 used in the 2007 Civic.
Part of Honda's R-series, this powerplant powered most 1.8L Civics in the 2006–2011 generation, and suffixes like A1 or A4 indicate regional variants and tuning.
Engine naming and lineage
Honda designates its mainstream 1.8-liter i-VTEC engine as the R18A family. The "R" denotes the family, while "A" indicates the 1.8-liter displacement. Within the R18A family, suffixes such as A1, A4 mark market- or revision-specific calibrations intended to meet different emissions and performance requirements.
Why the suffix matters
The A1 variant is the one most commonly found in North American 2006–2011 Civics, while other suffixes are used in various export markets. Exact specifications and power figures can vary slightly by market and model year due to emissions and tuning.
Regional variants overview
There are multiple regional versions of the 1.8L i-VTEC, each with small calibration differences. Below is a general guide to the common suffixes and where they appeared:
- R18A1 — Typically used in North American Civics (2006–2011), 1.8L i-VTEC with standard tuning.
- R18A4 — Used in other markets with different emissions systems and tuning.
- R18A2 or R18A5 — Additional regional calibrations for certain countries and model specs.
Regardless of suffix, all are part of Honda's 1.8L i-VTEC family with similar core architecture and performance characteristics.
Technical snapshot
Key specifications for the 2007 Civic's 1.8L engine (as applied to typical US-spec LX/EX trims) include:
- Displacement: 1.8 L (1799 cc)
- Configuration: Inline-4
- Valvetrain: i-VTEC
- Power: ~140 hp (SAE net) at around 6,300–6,350 rpm
- Torque: ~128 lb-ft (SAE net) at around 4,600 rpm
- Transmission options: 5-speed manual or 5-speed automatic, depending on trim
Exact numbers can vary slightly by market and model year due to tuning and emissions requirements.
Summary
The 2007 Honda Civic’s 1.8 L four-cylinder engine is known by its code R18A1, part of Honda’s R-series family. It represents the standard 1.8L i-VTEC configuration used in many Civics of that generation, with regional suffixes like A1 or A4 indicating market-specific calibrations.
What is the engine code for a 2007 Honda Civic 1.8 L?
R18A1 R
2007 Honda CIVIC (1.8L 4 -cyl Engine Code R18A1 R) Motor Oil, Filters and Lubricants - AMSOIL.
Is the 1.8 L Honda engine VTEC?
1.8-Liter, SOHC i-VTEC® 4-Cylinder Engine - 2022 Honda HR-V | Honda Info Center.
What is a D17 engine?
The wave piston. Design makes engine combustion. Even more efficient increased cylinder pressure enables higher power generation. While the latest injector design ensures the best fuel economy.
What motor is K20Z3?
2006-2011 Honda Civic Si 2.0L I-VTEC DOHC USDM Engine K20Z3 MOTOR | Genuine OEM | 4 Cylinders | 2.0L | Gasoline | 1 Month Manufacturer Warranty.