If you’re looking for a detailed breakdown of the Honda K24Z6 engine, you’ve come to the right place. This comprehensive guide to understanding the Honda K24Z6 Engine Specs and Performance will cover everything you need to know. We’ll look at its design, power figures, and what makes it so special to enthusiasts.
Honda K24Z6 Engine Specs and Performance – Comprehensive guide to understanding
The K24Z6 is a 2.4-liter inline-four gasoline engine from Honda’s renowned K-series family. It found its home in popular models like the 2009-2011 Honda Accord (in certain trims) and the 2012-2015 Acura TSX. It’s celebrated for its smooth power delivery, excellent reliability, and strong tuning potential.
Let’s break down the core specifications that define this powerplant.
Core Technical Specifications
Understanding the basic numbers is the first step. Here are the key specs straight from the factory:
- Engine Code: K24Z6
- Displacement: 2.4 liters (2354 cc)
- Bore x Stroke: 87 mm x 99 mm
- Compression Ratio: 10.5:1
- Valvetrain: DOHC i-VTEC (4 valves per cylinder)
- Horsepower: 190 hp @ 7000 rpm (for Accord applications)
- Torque: 162 lb-ft @ 4400 rpm (for Accord applications)
- Redline: 7100 rpm
- Fuel System: Multi-Point Fuel Injection (MPFI)
- Block Material: Aluminum
- Head Material: Aluminum
Key Performance Features and Technologies
The K24Z6 isn’t just about the numbers. It’s the technologies underneath that create its character.
i-VTEC System
Honda’s intelligent VTEC system is a star feature. It combines VTC (Variable Timing Control) on the intake cam with VTEC (Variable Valve Timing and Lift Electronic Control). This provides a great balance.
- At low RPM, it prioritizes fuel efficiency and smooth torque.
- As you rev higher, the VTEC lobe engages, changing valve timing and lift for a noticeable surge in power. The crossover is around 5,000-5,500 RPM, giving you that classic Honda VTEC “kick.”
Dual-Stage Intake Manifold (DBW)
This engine uses a Drive-By-Wire throttle and a dual-stage intake manifold. It has two paths for air:
- A longer runner for better low-end and mid-range torque.
- A shorter runner that opens up at higher RPM to improve airflow for maximum horsepower.
Friction Reduction
Honda employed several techniques to reduce internal friction. This includes plateau-honed cylinder walls and lightweight pistons. The result is a freer-revving engine that responds quickly to throttle inputs.
Real-World Driving Experience
So what’s it actually like to drive a car with the K24Z6? The experience is typically very engaging.
Around town, the engine is docile and fuel-efficient. The torque is adequate for daily commuting. But when you push the accelerator past the halfway point, the character changes. The engine builds revs smoothly and then, as VTEC engages, it pulls strongly to the redline with a satisfying growl. The powerband is broad and usable.
It’s not a turbocharged engine, so you don’t get a sudden shove of torque. Instead, you get a linear, progressive build of power that rewards you for keeping the revs up. The throttle response is immediate due to the drive-by-wire system being well-tuned.
Reliability and Common Issues
The K24 series has a legendary reputation for durability, and the Z6 is no exception. With proper maintenance, these engines can easily exceed 200,000 miles. However, no engine is perfect. Here are a few points to watch for:
- Oil Consumption: Some K24 engines, especially with higher mileage, may begin to consume oil. Regular checks (every 1,000 miles) are a good habit.
- VTEC Solenoid Gasket: The gasket on the VTEC solenoid on the valve cover can leak oil. It’s a cheap and easy fix.
- Spark Plug Tube Seals: Another common leak point is the seals around the spark plug tubes in the valve cover. Replacing the valve cover gasket set addresses this.
- Motor Mounts: The hydraulic engine mounts can wear out over time, leading to increased vibration in the cabin.
Overall, these are minor issues. The core rotating assembly and valvetrain are extremely robust.
Tuning and Modification Potential
This is where the K24Z6 truly shines for enthusiasts. It’s a fantastic platform for making more power. The aftermarket support is huge. Here’s a basic roadmap for tuning, starting from simple bolt-ons.
Stage 1: Basic Bolt-Ons
These mods improve airflow and free up a few horsepower without needing a tune, though a tune will maximize gains.
- Cold Air Intake (CAI): Improves intake airflow and sound.
- Exhaust System: A less restrictive cat-back or header-back exhaust reduces backpressure.
- Throttle Body: A larger bore throttle body from a K24A2 (70mm) can be a direct upgrade.
Stage 2: ECU Tuning and Further Enhancements
To really unlock the potential of your bolt-ons, you need custom software.
- ECU Reflash/Standalone: A custom tune from a reputable tuner (like Hondata or KTuner) adjusts fuel maps, ignition timing, and VTEC engagement. This alone can yield significant gains, especially when combined with bolt-ons.
- Performance Cams: Upgrading the camshafts can dramatically increase high-RPM horsepower.
- High-Compression Pistons: For all-motor builds, increasing the compression ratio squeezes more power from each combustion cycle.
Forced Induction (Turbo/Supercharger)
The K24Z6 handles boost very well due to its strong internals. A low-to-moderate boost forced induction setup (6-10 psi) on a stock block is common and can double the wheel horsepower. Always remember to include:
- A proper engine management tune.
- Upgraded fuel pump and injectors.
- A strong clutch for manual transmissions.
Comparison to Other K-Series Engines
How does the Z6 stack up against its siblings? Here’s a quick look.
- vs. K24A2 (from Acura RSX Type-S): The A2 has a higher 11.0:1 compression ratio, more aggressive cams, and a different intake manifold. It makes 205 hp. The Z6 is a slightly more street-focused, mid-range torque version.
- vs. K24Z7 (from Honda Civic Si): The Z7 is very similar but has a higher 11.0:1 compression ratio and a more aggressive factory tune, resulting in 201 hp. The blocks are nearly identical.
- vs. K20 Engines: K20 engines (2.0L) generally rev higher and have a more peaky powerband, while the K24 offers more displacement for stronger low-end and mid-range torque.
Essential Maintenance Tips
To keep your K24Z6 running smoothly for the long haul, follow these key maintenance steps.
- Oil Changes: Use a high-quality synthetic 5W-20 or 5W-30 oil every 5,000 miles or 6 months. This is the single most important thing you can do.
- Timing Chain: The K24 uses a timing chain, not a belt. It’s designed to last the life of the engine but listen for excessive rattling on startup, which could indicate a worn tensioner.
- Cooling System: Flush the coolant every 60,000 miles or as specified in your manual. The aluminum engine is sensitive to overheating.
- Valve Adjustment: Honda recommends checking valve clearance every 110,000 miles. Tight valves can lead to a loss of power and burned valves.
- Use Top-Tier Fuel: The 10.5:1 compression ratio benefits from good quality, 87-octane or higher fuel to prevent knocking.
FAQ Section
What cars came with the K24Z6 engine?
It was primarily used in the 2009-2011 Honda Accord EX-L V6 sedan (as the 4-cylinder option in some years) and the 2012-2015 Acura TSX. Always check the engine bay stamp to be sure.
Can you swap a K24Z6 into an older Honda?
Absolutely. K-swaps are extremely popular. The K24Z6 is a great candidate for swapping into cars like the Honda Civic, Integra, or older Accord due to its power and availability. You’ll need custom mounts, wiring harness adapters, and an ECU solution.
What is the horsepower potential of a stock K24Z6?
On stock internals with bolt-ons (intake, header, exhaust) and a aggressive tune, you can expect around 200-215 wheel horsepower. With forced induction, 300-400 wheel horsepower is achievable on the stock block with proper supporting mods and tuning.
Is the K24Z6 an interference engine?
Yes, like most modern high-compression engines, it is an interference engine. If the timing chain were to fail or skip, the valves would likely collide with the pistons, causing severe engine damage.
What’s the difference between the K24Z6 and K24Z3?
The K24Z3 is the engine found in the Honda CR-V of similar years. It has a lower compression ratio (9.7:1), different camshafts, and a more SUV-focused tune for lower-end torque, making about 180 hp. The Z6 is the performance-oriented variant.
How good is the fuel economy with this engine?
In applications like the Accord, you can expect around 22-26 MPG in city driving and 30-34 MPG on the highway. It’s very efficient for its power output, thanks in part to the i-VTEC system.
Final Thoughts
The Honda K24Z6 engine is a brilliant piece of engineering that offers a perfect blend of daily-driver civility and enthusiast-friendly performance. Its specs tell a story of smart technology, like i-VTEC, working to provide a wide powerband. Its reputation for reliability is well-earned, making it a low-stress ownership experience.
Whether you’re maintaining a stock Accord, modifying a TSX, or considering one for a swap, the K24Z6 has a lot too offer. Its strong aftermarket support and robust design mean you can enjoy it as-is or build it into a serious performance machine. Understanding its specs and performance characteristics is the first step to appreciating one of Honda’s best modern four-cylinder engines.