The 2006 Honda Civic with a 1.8-liter four-cylinder engine produces 140 horsepower.
In broader terms, the 1.8-liter i-VTEC four-cylinder used in North American Civics of that year is known by the R18A1 code. It delivers 140 hp at 6,300 rpm and about 128 lb-ft of torque around 4,600 rpm, depending on trim and drivetrain configuration. This pairing was designed to balance everyday usability with reasonable efficiency for the era's Civics.
Engine specs and horsepower figures
Key numbers for the 1.8L engine in the 2006 Civic are summarized below:
- Horsepower: 140 hp (at 6,300 rpm)
- Torque: 128 lb-ft (around 4,600 rpm)
- Engine code: R18A1
These specs reflect the commonly cited figures for US-market LX and EX models, with both manual and automatic transmissions offered at the time.
Important distinctions
It's worth noting that the 2006 Honda Civic Si uses a different engine entirely, the 2.0L i-VTEC K20A2, which produces about 197 hp, significantly more power than the 1.8L models.
Why the numbers vary (if at all)
In some markets or model years, minor differences in rating can occur due to tuning, emissions equipment, or measurement standards (e.g., SAE net horsepower vs. gross). For the 2006 Civic in North America, the standard rating is 140 hp.
Summary
For the 2006 Honda Civic equipped with the 1.8-liter four-cylinder engine, the official horsepower figure is 140 hp, paired with 128 lb-ft of torque. This places the 1.8L Civics in a practical performance range suitable for daily driving and efficient commuting, while the sport-focused Si remains a separate, higher-powered model with a different engine.