What engine is in a 2005 Acura RSX?
The 2005 RSX could use one of two 2.0-liter i-VTEC engines, depending on trim: the base RSX uses the K20A3 (about 160 horsepower), while the RSX Type-S uses the K20A2 (about 210 horsepower).
In 2005, Acura offered two RSX trims in the United States. Both are part of Honda’s K-series family, but they are tuned differently to deliver distinct performance levels. The base model emphasizes practical power and efficiency, while the Type-S is tuned for higher-revving performance and speed, backed by a sport-oriented 6-speed manual transmission.
Engine options by trim
Below is a concise look at the two engine options that could be installed in a 2005 RSX, depending on trim and market.
- Base RSX — 2.0-liter inline-4, K20A3, i-VTEC, approximately 160 horsepower and around 140 lb-ft of torque. Typically paired with a 5-speed manual transmission.
- RSX Type-S — 2.0-liter inline-4, K20A2, i-VTEC, approximately 210 horsepower and around 142 lb-ft of torque. Paired with a 6-speed manual transmission.
In short, the engine in a 2005 RSX is a pair of 2.0-liter i-VTEC K-series engines chosen by trim level: the base model with the K20A3 and the sportier Type-S with the K20A2.
What is i-VTEC?
i-VTEC is Honda’s variable valve timing system that adjusts valve lift and timing for different engine speeds. It helps optimize efficiency at low RPM and maximize power at high RPM, a hallmark of the RSX’s responsive, high-revving character.
Summary
The 2005 Acura RSX does not have a single engine; it offers two 2.0-liter i-VTEC inline-4s. The base RSX uses the K20A3 (about 160 hp), and the RSX Type-S uses the higher-performance K20A2 (about 210 hp). The Type-S also features a 6-speed manual, while the base trim typically uses a 5-speed manual, reflecting each model’s intended driving experience.
