Honda K24z4 Engine Specs And Performance – Detailed Technical Analysis

by

If you’re looking at a Honda with a 2.4-liter engine, you’re probably curious about the specific powerplant under the hood. This detailed technical analysis covers the Honda K24Z4 engine specs and performance. We’ll look at everything from its design origins to its real-world power delivery, giving you a clear picture of what this engine can do.

Honda K24Z4 Engine Specs and Performance

The K24Z4 is a 2.4-liter, inline-four cylinder engine that represents a key evolution in Honda’s K-series family. It was primarily used in the European and Asian market Honda Accord (8th generation, CU chassis) from 2008 to 2015, and in the Honda CR-V (third generation, RE chassis) in similar markets. It’s known for its smooth power delivery and excellent reliability, building on Honda’s reputation for engineering great four-cylinder engines.

Core Technical Specifications

Let’s start with the fundamental numbers that define the K24Z4. These specs are the blueprint for its performance.

  • Engine Code: K24Z4
  • Configuration: Inline-4 (DOHC i-VTEC)
  • Displacement: 2354 cc (2.4 liters)
  • Bore x Stroke: 87.0 mm x 99.0 mm
  • Compression Ratio: 10.5:1
  • Valvetrain: 16-valve, Dual Overhead Cam (DOHC) with i-VTEC (Variable Valve Timing and Lift Electronic Control on both intake and exhaust)
  • Fuel System: Multi-Point Fuel Injection (PGM-FI)
  • Redline: 7000 rpm

Detailed Performance Output

The power figures vary slightly depending on the application, mainly between the Accord and CR-V, due to different tuning and exhaust setups.

Honda Accord K24Z4

  • Maximum Power: 200 PS (197 hp) @ 7000 rpm
  • Maximum Torque: 232 Nm (171 lb-ft) @ 4400 rpm

Honda CR-V K24Z4

  • Maximum Power: 170 PS (168 hp) @ 5800 rpm
  • Maximum Torque: 220 Nm (162 lb-ft) @ 4200 rpm

The Accord version benefits from a less restrictive exhaust system and more aggressive ECU tuning, allowing it to rev higher and make more power. The CR-V tune prioritizes mid-range torque for better everyday drivability in an SUV.

Key Design Features and Technology

The K24Z4 isn’t just about numbers. Its engineering features explain why it performs the way it does.

i-VTEC System

This is Honda’s intelligent VTEC system. Unlike older VTEC that only affected the intake valves, i-VTEC on the K24Z4 controls timing for both intake and exhaust camshafts. This allows for:

  • Improved fuel economy at low engine speeds.
  • Better emissions control.
  • A broader, flatter torque curve for responsive acceleration.
  • It continuously adjusts valve timing, making the transition between power bands very smooth compared to the classic VTEC “kick.”

Aluminum Block and Head

The engine uses a lightweight aluminum alloy block and cylinder head. This reduces overall vehicle weight, which helps with handling and fuel efficiency. The open-deck block design is cost-effective to manufacture and provides excellent cooling, though it’s less rigid than a closed-deck block for extreme forced induction.

Chain-Driven Camshafts

The K24Z4 uses a timing chain instead of a belt. This is a maintenance-free item designed to last the life of the engine, unlike timing belts which need replacement every 60,000-100,000 miles. This is a significant long-term reliability benefit.

Drive-by-Wire Throttle

It employs an electronic throttle control (ETC), often called drive-by-wire. This allows for more precise throttle response integration with stability control and other vehicle systems, though some enthusiasts prefer the direct feel of a cable throttle.

Real-World Performance and Driving Experience

So what’s it actually like to drive a car with the K24Z4? The experience is characterized by refinement and linear power.

  • Smooth and Linear Power Delivery: Thanks to i-VTEC, power builds progressively without a sudden surge. It feels eager from low revs and pulls strongly to the redline.
  • Strong Mid-Range Torque: The torque peak around 4200-4400 rpm means you have good passing power without needing to downshift constantly. This makes for relaxed highway driving.
  • High-RPM Capability: It’s happy to rev, feeling smooth and composed near its 7000 rpm limit in the Accord variant. The engine note is sporty without being harsh.
  • Everyday Usability: The combination of low-end responsiveness and high-end power makes it a versatile engine suited for both commuting and spirited driving.

Common Modifications and Tuning Potential

The K24Z4 has a strong following in the tuning community. While not as popular as the K20A for all-out performance, it offers excellent torque-based potential.

  1. Cold Air Intake (CAI): A simple first mod to improve throttle response and engine sound.
  2. Exhaust System: A cat-back or header-back exhaust can free up a few horsepower and improve flow, especially in the CR-V version which is more restricted.
  3. ECU Tuning/Re-flash: This is where significant gains are found. A professional reflash can adjust ignition timing, fuel maps, and VTEC engagement, often unlocking 10-15+ horsepower and improving drivability.
  4. Forced Induction: The K24Z4 is a strong candidate for turbocharging or supercharging. With a compression ratio of 10.5:1, lower boost levels are typical on pump gas. Properly built, these engines can reliably handle significant power increases.
  5. Internal Upgrades: For high-power builds, forged rods and pistons, along with upgraded head studs, are common to handle the increased cylinder pressure.

Reliability and Common Issues

Overall, the K24Z4 is a very robust engine with a well-earned reputation for longevity. With proper maintenance, reaching 200,000 miles or more is common. However, there are a few points to watch for:

  • VTC Actuator Rattle: A common issue on many K-series engines. On cold start, you might hear a brief rattling sound from the front of the engine for 1-2 seconds. This is caused by wear in the Variable Timing Control (VTC) actuator. It rarely causes immediate failure but can be replaced to eliminate the noise.
  • Oil Consumption: Some engines may begin to consume oil at higher mileage, often due to worn piston rings or valve stem seals. Regular oil level checks are recommended.
  • Spark Plug Tube Seals: These can degrade over time, allowing oil to leak into the spark plug wells. This is a relatively inexpensive fix but requires removing the valve cover.
  • Maintenance is Key: Using the correct 0W-20 or 5W-30 synthetic oil and changing it regularly (every 5,000-7,500 miles) is crucial. Also, keep up with air filter and spark plug changes as outlined in the manual.

K24Z4 vs. Other K24 Engines

It’s helpful to see how the Z4 stacks up against its siblings, like the common North American K24A.

  • K24Z4 vs. K24A (e.g., from Accord TSX): The K24A often has a slightly higher compression ratio (11.0:1) and different camshafts. The K24A in the TSX made about 205 hp. The Z4’s i-VTEC system is more advanced than the VTEC found on some earlier K24A variants, which only had variable timing on the intake.
  • K24Z4 vs. K24W (Earth Dreams): The newer K24W Earth Dreams engine uses direct injection, a higher 11.1:1 compression ratio, and a lighter weight design. It makes more power and torque with better fuel efficiency, but is a more complex engine overall.
  • The Z4 sits as a refined, late-model version of the traditional port-injected K-series, balancing performance, simplicity, and reliability.

Fuel Economy and Efficiency

For a 2.4-liter naturally aspirated engine from its era, the K24Z4 delivers respectable fuel economy.

  • Honda Accord (EU): Around 8.5 – 9.5 L/100km (combined) depending on transmission and driving style. That’s roughly 25-28 MPG.
  • Honda CR-V (EU): Given its higher weight and SUV shape, expect figures closer to 9.5 – 10.5 L/100km (combined), or about 22-25 MPG.

The i-VTEC system’s ability to optimize valve timing for cruising is a major contributor to these figures. Using the correct low-viscosity engine oil is also important for achieving the best mileage.

Summary and Final Thoughts

The Honda K24Z4 engine is a testament to Honda’s ability to refine a proven design. It offers a great mix of smooth, usable power, high-revving character, and outstanding reliability. While it may not have the extreme top-end focus of a K20, its torquey nature makes it fantastic for daily driving and a potent candidate for tuning.

Whether you own a car with this engine, are considering buying one, or are planning a project, the K24Z4 provides a solid and rewarding foundation. Its strong aftermarket support and wealth of community knowledge make it an excellent choice for both enthusiasts and those just seeking dependable transportation.

Frequently Asked Questions (FAQ)

What cars have the K24Z4 engine?

The primary applications are the European/Asian market Honda Accord (8th gen, 2008-2015) and the Honda CR-V (3rd gen, 2007-2012 in some markets). Always check your vehicle’s specific engine code.

Is the K24Z4 a good engine?

Yes, it is widely regarded as an excellent engine. It’s smooth, powerful enough for daily use, reliable, and has good tuning potential. Its timing chain is a major plus for long-term ownership costs.

How much horsepower can a K24Z4 handle?

The stock internals are robust. With a proper tune, a turbocharged K24Z4 can reliably handle 300-350 horsepower. For beyond that, forged internal components are highly recommended to ensure durability.

What’s the difference between K24Z4 and K24A?

The main differences lie in the VTEC system and tuning. The K24Z4 uses i-VTEC (variable timing on intake and exhaust), while many K24A engines have VTEC on the intake cam only. Specific power outputs and compression ratios also vary between the different A and Z sub-models.

Does the K24Z4 have VTEC?

Yes, it features Honda’s i-VTEC system. This provides variable valve timing and lift control on both the intake and exhaust camshafts for a balance of power, efficiency, and smooth operation.

What oil does a K24Z4 use?

Honda typically recommends 0W-20 or 5W-30 full synthetic engine oil. Always confirm with your owner’s manual, as specifications can change by market and model year. Using the right oil is key for its longevity.