What k24 is in the Acura TSX?
In short: the Acura TSX uses a 2.4-liter K-series engine. Early cars rely on the K24A2 variant (2004–2008), while later models use the revised K24Z3 variant (2009–2014).
The TSX is Honda’s compact sedan that relied on a single, naturally aspirated 2.4-liter inline-four from the K-series family across its North American timeline. The “K24” designation refers to the 2.4-liter displacement, with i-VTEC variable valve timing guiding performance and efficiency. Below is a concise look at how the TSX used different K-series variants over its generations, what changed between them, and what buyers or owners should know about maintenance and parts compatibility.
Engine variants in the TSX
Key engine variants used in the TSX, along with their general years and a snapshot of their characteristics.
- K24A2 — Found in the 2004–2008 Acura TSX. 2.4L DOHC i-VTEC with roughly 200–210 hp and about 160–167 lb-ft of torque, depending on market and model year.
- K24Z3 — Found in the 2009–2014 Acura TSX. Updated 2.4L i-VTEC with revised internals and intake tuning, delivering around 200 hp and roughly 170 lb-ft of torque.
Notes: exact figures vary by market and model year due to tuning, exhaust, and emissions certifications. If you’re evaluating a used TSX, checking the engine code on the VIN plate or under the hood, as well as the service records, will confirm which variant you have.
How the two generations differ
The TSX retained the same overall displacement and i-VTEC concept across generations, but the late-model K24Z3 brought refinements such as revised intake manifolds, updated cam profiles, and ECU calibrations intended to improve low- and mid-range torque and fuel economy for certain markets.
Maintenance and parts compatibility
Although the engines share a family, certain internals (valvetrain components, timing gear/chain specifics, gaskets, and seals) vary by code. This matters for timing engine service, head gasket considerations, and compatibility of intake/exhaust hardware. When replacing parts, using the correct K-series variant is important for fitment and performance.
Performance and related specs at a glance
Across its years, the TSX’s 2.4L K-series engines are designed to deliver smooth power with i-VTEC enabling strong high-end performance while maintaining everyday drivability.
- Displacement: 2.4 liters
- Valvetrain: DOHC with i-VTEC
- Typical power: roughly 200–210 hp
- Torque: roughly 160–170 lb-ft
Exact figures can vary by year, market, and specific tuning—verify the engine code and accompanying specifications for a precise match.
Summary
The Acura TSX runs on a 2.4-liter K-series engine, with two main variants across its production span: K24A2 in 2004–2008 models and K24Z3 in 2009–2014 models. The K-series approach in the TSX centers on balancing performance with reliability, using i-VTEC to optimize airflow and timing. When shopping for or maintaining a TSX, identifying the correct engine code is key for parts compatibility, service planning, and understanding potential maintenance needs.
What's better, K24A2 or K24Z3?
The major advantage to our original K24A2 swap is the naturally aspirated power potential. A K24Z3 engine is a very solid option for 200-210whp, but in order to make much more power, a K20 head (or K24A2 head) needs to be swapped on, which comes with its own share of complications.
Which Acura had the K24?
Over the years, Honda has produced several variants of the K24 engine, including the K24A1, K24A2, K24A3, K24A4, K24A8, and K24Z7. These variants have been used in various Honda and Acura models, including the Honda Accord, Honda CR-V, Honda Element, Acura TSX, and Acura ILX.
Which K24 does the TSX have?
K24A1: 2002-2009 Honda CR-V. K24A2: 2004-2008 Acura TSX. K24A4: 2003-2005 Honda Accord, 2003-2008 Honda Odyssey, 2003-2006 Honda Element. K24A8: 2006-2007 Honda Accord, 2007-2011 Honda Element.
Are the K24A and K24A2 the same?
In Japan, all K24 engines are labeled simply "K24A" — whether they come from an Accord, Odyssey, CR-V, or Stepwagon. This differs from the U.S., where engine codes like K24A2 or K24A4 designate specific cam profiles, intake manifolds, compression ratios, and more.
