What engine does the Acura RSX use?
The Acura RSX uses two versions of Honda’s 2.0-liter i-VTEC four-cylinder engine. The base RSX relies on the K20A3, while the sportier RSX Type-S uses the higher-performance K20A2.
Overview of the RSX engine lineup
For buyers and enthusiasts, the RSX represents two distinct powertrains within a single model line. The base model prioritizes efficiency and still delivers usable performance, while the Type-S is tuned for higher output and a more aggressive, high-revving character. Here’s a closer look at each engine option.
Base RSX engine: K20A3 2.0-liter i-VTEC
The standard RSX is powered by a 2.0-liter inline-four known as the K20A3. It features Honda’s i-VTEC with variable valve timing and lift, and it delivers spirited acceleration suitable for everyday driving. In U.S. market cars, this engine produces around 160 horsepower and about 140 horsepower-feet of torque, making it the more economical choice of the RSX lineup. It’s paired with a standard 5- or 6-speed manual in various years, and an automatic option was also available.
Before listing the key specifications, note that some market and year-to-year variations exist. Below are the commonly cited figures for the K20A3-equipped RSX base model:
- Displacement: 2.0 liters (1,998 cc)
- Engine family: K-series, i-VTEC
- Power output: ~160 horsepower
- Torque: ~141 lb-ft
- Rev limit: typically around 7,200–7,400 rpm
- Applications: RSX (base/model years around 2002–2004 in the U.S.; later years vary by market)
In summary, the K20A3 in the RSX base provides reliable, high-revving performance with modest weight and good everyday usability, setting the tone for a balanced sporty coupe.
RSX Type-S engine: K20A2 2.0-liter i-VTEC
The RSX Type-S represents the higher-performance end of the lineup with a more aggressive, higher-output version of the same 2.0-liter family. The K20A2 is tuned to deliver significantly more horsepower while maintaining the compact, lightweight characteristics that define the RSX. In U.S. market Type-S cars, this engine is capable of around 210 horsepower and roughly 142 lb-ft of torque, delivering a markedly faster acceleration profile and a higher redline for spirited driving. It’s often paired with a close-ratio manual transmission to maximize throttle response and gear utilization.
Key specifications for the K20A2-powered RSX Type-S commonly cited in reviews and specifications include:
- Displacement: 2.0 liters (1,998 cc)
- Engine family: K-series, i-VTEC
- Power output: ~210 horsepower
- Torque: ~142 lb-ft
- Rev limit: typically around 8,000–8,500 rpm
- Applications: RSX Type-S (U.S. market, model years ~2002–2006)
Overall, the K20A2-powered RSX Type-S is celebrated for its high-revving nature, stronger mid- to top-end performance, and a driving experience that emphasizes sportier character and precision.
Why two engines exist in one model
Honda designed the RSX for two customer profiles: everyday practicality and enthusiast performance. The base K20A3 keeps the RSX accessible and efficient, while the K20A2-equipped Type-S offers a more energetic driving experience with a higher power ceiling. The choice between the two reflects a balance between value and sport-oriented performance that defined the RSX during its production years.
Summary
The Acura RSX employs a pair of 2.0-liter i-VTEC inline-four engines. The base RSX uses the K20A3, delivering around 160 hp, while the RSX Type-S uses the higher-output K20A2, delivering around 210 hp. Both share the same family and layout, emphasizing lightweight design and high-revving performance that characterized the RSX throughout its production run.
Does the RSX have a K20?
In engines such as the K20A2 found in the Acura RSX Type-S, the VTEC system operates on both the intake and exhaust valves, allowing both to benefit from multiple cam profiles.
Which Acura had the K24A2?
-2008 Acura TSX
K24A2: 2004-2008 Acura TSX.
What motor is in the 2006 RSX type S?
The 2006 Acura RSX Type-S is powered by a 2.0-liter DOHC inline-4 engine with the K20Z1 designation, producing 201 horsepower at 7800 rpm and 140 lb-ft of torque at 7000 rpm. It features a high-performance i-VTEC system, a 6-speed manual transmission, and is a front-wheel-drive vehicle.
Engine specifications
- Engine: 2.0-liter, 16-valve, DOHC, 4-cylinder with i-VTEC
- Horsepower: 201 hp @ 7800 rpm
- Torque: 140 lb-ft @ 7000 rpm
- Transmission: 6-speed manual
- Drivetrain: Front-wheel drive
- Redline: 8100 rpm
- Compression Ratio: 11.0:1
- Fuel: Premium unleaded
Key features
- i-VTEC: A high-performance version of the i-VTEC system provides a dual personality, offering normal performance at lower RPMs and a strong pull at higher RPMs.
- Transmission: A 6-speed manual gearbox was the only option for the Type-S model and is known for its tight, short-throw shifter.
- Intake: The Type-S model features a fixed, high-volume intake manifold for improved airflow.
- Braking: The Type-S has larger front brakes (11.8-inch ventilated discs) compared to the standard RSX.
What engine is in an RSX?
The Acura RSX has a 2.0-liter DOHC i-VTEC 4-cylinder engine, with power output varying between models. The base model produces 160 horsepower, while the higher-performance RSX Type-S model generates 201 horsepower.
- Acura RSX (Base):
- Engine: 2.0-liter DOHC i-VTEC 4-cylinder (K20A3)
- Horsepower: 160 hp @ 6500 rpm
- Torque: 141 lb-ft @ 4000 rpm
- Acura RSX Type-S:
- Engine: 2.0-liter DOHC i-VTEC 4-cylinder (K20A2 or K20Z1)
- Horsepower: 201 hp @ 7800 rpm
- Torque: 140 lb-ft @ 7000 rpm
- Distinguishing feature: Features a high-performance version of i-VTEC and a fixed, high-volume intake manifold.
