The first thing that comes to any car enthusiast’s mind when they think of ‘Honda’ is their legendary four-cylinder engines. Many, such as the D-series or B-series engines, have left their mark, establishing Honda as a paragon of reliability and performance. However, where Honda truly hit the sweet spot was the K-series of engines.
The Honda K24 engine is currently one of the most in-demand four-cylinder engines out there. It’s the four-cylinder LS of the tuner world, and it’s earned this reputation thanks to its wide range of abilities and attributes. Join us as we break down the Honda K24 and explain why this engine is such an awesome piece of automotive engineering.
Article updated on 06.24.2024
The Birth of the Honda K24
Honda’s K-series engines, born from decades of experience, trace their conceptual roots to 1999 when the S2000’s F20C engine was launched. The F20C, known for its high power-to-liter ratio, influenced the K24’s design despite no direct mechanical similarities. Key features like the DOHC setup with roller rocker arms, timing chain, and coil-on-plug ignition system were derived from this engine’s tech.
The K-series engines also drew inspiration from Honda’s popular B-series, known for their high-revving, lightweight, and compact nature. Both the K-series and B16 engines deliver good gas mileage and impressive power-to-liter ratios.
The K-series comprises two short blocks — the K20 with 2 liters of displacement and the K24 with 2.4 liters. The Honda K20 engine has an 86 mm bore and stroke, while the K24, with an 87 mm bore and 99 mm stroke, features a higher deck height to accommodate the longer stroke.
What’s the Buzz About the K24 Engine?
The Honda K24 engine has garnered significant attention in the automotive community due to its impressive performance and reliability. Enthusiasts and tuners praise the K24’s robust design, high power output, and versatility.
From street racers to daily drivers, the K24 has found a loyal following, making it a popular choice for engine swaps and modifications. Let’s find out why the K24 engine is the talk of the town.
Why Is Everyone Talking About the K24?
For several compelling reasons, the Honda K24 engine has become a hot topic among car enthusiasts. First, its balance of power and efficiency makes it an excellent option for various vehicles, from sporty coupes to family sedans.
Additionally, the engine’s compatibility with many aftermarket parts allows for extensive modification, attracting a dedicated community of tuners. The K24’s reputation for reliability and longevity further enhances its appeal, making it a standout in the world of internal combustion engines.
Key Features and Specs That Make It Stand Out
The K24 engine stands out for its impressive specifications and features. With a displacement of 2.4 liters, it offers a robust balance of power and torque. The engine employs Honda’s i-VTEC (Intelligent Variable Valve Timing and Lift Electronic Control) technology, which optimizes performance and efficiency across various RPM ranges.
Also, the K24 features a durable aluminum block and head, contributing to its lightweight yet strong construction. These attributes, combined with a high compression ratio and a reliable fuel system, make the K24 a favorite among car enthusiasts and professionals.
A Closer Look at the Different K24 Variants
The Honda K24 engine has several variants, each with unique characteristics and applications. These versions cater to different needs, from daily commuting to high-performance racing.
Understanding the distinctions between these variants can help you choose the right engine for your specific requirements, whether you’re seeking fuel efficiency, durability, or an ideal candidate for a motor swap. Let’s explore some known K24 versions used in the USA market.
K24A1 — 2002-2006 Honda CR-V, known for its balance of power and reliability.
K24A2 — 2004-2008 Acura TSX, offering higher performance and popular among tuners.
K24A4 — 2003-2005 Honda Accord, 2003-2008 Honda Odyssey, 2003-2006 Honda Element, dependable for efficiency and performance.
K24A8 — 2006-2007 Honda Accord, 2007-2011 Honda Element, 2008-2014 Honda Odyssey, known for its reliability.
K24W1 (Earth Dreams) — 2013-2017 Honda Accord, featuring advanced fuel efficiency.
K24V7 — 2016-2022 Acura ILX, combining performance with modern features.
K24W7 (Earth Dreams) — 2015-2020 Acura TLX, offering a blend of power and luxury.
K24Y2 — 2012-2015 Honda Crosstour, known for its versatility.
K24Z1 — 2007-2009 Honda CR-V, providing solid performance.
K24Z2 — 2008-2012 Honda Accord LX/LX-P, reliable and efficient.
K24Z3 — 2008-2012 Honda Accord LX-S/EX/EX-L, 2009-2014 Acura TSX, offering enhanced performance.
K24Z4 — 2008-2012 Honda CR-V, known for its durability.
K24Z6 — 2010-2014 Honda CR-V, providing improved efficiency.
K24Z7 — 2012-2015 Honda Civic Si, 2013-2015 Acura ILX, favored by performance enthusiasts for its advanced features.
Which K24 Variant Is Right for You?
Choosing the right K24 variant depends on your needs, whether you prioritize fuel efficiency, durability, or performance. Each K24 engine offers unique benefits tailored to different driving experiences. Here, we categorize the K24 variants to help you decide which best suits your requirements, from economic daily drivers to high-performance builds.
Fuel Efficiency — K24A1
Ideal for those prioritizing fuel economy without sacrificing too much power, commonly found in the Honda CR-V. This was the first Honda engine that was released within the K24 series. Considering this was one of the first K-series engines, its 160 hp and 162 lb-ft torque figures don’t seem that low.
Despite not being as performance-oriented as the other K24 versions, the K24A1 remains a popular choice because of its availability and price. Another big reason it’s considered is that the cylinder head can be ported easily, improving airflow.
The K24A1 is also closely related to the most popular K-series, which can be retrofitted with components like the oil pump and head from the K24A2.
Durability — K24A4
The K24A4 draws inspiration from the K24A1, which means it misses out on the performance-oriented bits found on the K24A2. It is known for its robust construction and longevity, making it a reliable choice for everyday use, typically seen in the Honda Accord.
It also runs a lower compression like the K24A1 at 9.7:1. As a result, it puts out figures closer to the A1 at 160 hp and 161 lb-ft. However, it wasn’t the same as the A1, and changes included a single-stage intake manifold and redesigned intake and exhaust ports.
It’s widely known in the Honda community that these revisions negatively affected the intake/exhaust flow compared to the K24A1. This is not surprising, as these changes came about to meet the stricter emission norms.
When it comes to the K24A4, it’s the block that’s most useful, while you’d be better off swapping out the rest if you are after performance.
Performance — K24A2
Favored for its high performance and tunability, this variant from the Acura TSX is a top pick among enthusiasts looking to enhance their vehicle’s capabilities. The K24A2 is considered one of the best ready-to-go versions of the four-cylinder engine. However, the hype around it has also led to an increase in its price tag, making it less cost-efficient than a slightly tuned version of the less popular K-series engines.
The K24A2 is identical to the K24A Japanese Domestic Market (JDM), with the main differences being a modified water pump housing, a sensor on the VTEC solenoid, and a few other minor things. While the K24A has to be imported, the K24A2 is readily available stateside as it came in the Acura TSX from 2004-2008.
The K24A2 used in the TSX between 2004 and 2005 made 197 hp and 166 lb-ft of torque. For 2006-2008, the engine got a larger air intake, from 70 mm to 80 mm, a revised throttle body, from 60 mm to 64 mm, along with enhanced intake valves, a new intake camshaft, and an exhaust system upgrade. This increased the power to 205 hp but dropped the torque slightly to 164 lb-ft.
Unlike the K24A1, this version had sportier bits, including lightweight pistons, a forged and fully counterweight crankshaft, and an increased compression ratio similar to the JDM K24A.
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What Makes It So Popular?
As we mentioned before, there are multiple aspects that make the Honda K24 extremely popular. However, these qualities wouldn’t be useful if the engine wasn’t so versatile. Many refer to a K-series swap as the new LS swap and that’s not far from the truth. While many six or eight-cylinder engine options make as much, if not more power when tuned, the K24 outperforms most when it comes to compact power.
That’s not to say that the K24 is not powerful. With the right mods, it can surpass almost any other engine of its size. Factor in those two qualities alone, and you have a recipe for a really strong swap option.
The last few years have also shown us that you can K-swap almost anything. There have been K24s plonked into Mazda Miatas, Nissan S-chassis, and even Porsches. Other Honda cars are the most common hosts. You’ll see K24s in anything from an EK Civic to the NSX and S2000.
Another popular car that gets the Honda K24 treatment is the Mini Cooper. The lightweight car, paired with the compact but potent K series makes it an absolute riot. Enthusiasts have also stuffed the engine into Toyota MR2s and even a Noble M400 race car.
While many of the cars mentioned above would do just fine with their original engines, the Honda K24 opens up a whole new world regarding tuning and development. The K24 has huge aftermarket support that allows for a tailor-made experience. You can customize it to make the power and torque you want and the fashion it delivers.
Like that isn’t enough of a reason, the Honda K24 is also available in abundance, meaning you can extract impressive performance at an attainable price.
Performance — What Can You Expect?
The Honda K24 engine is celebrated for its exceptional performance, making it a favorite among car enthusiasts and everyday drivers. Whether you’re looking for a reliable engine for your daily commute or a powerful option for your next race, the K24 delivers on multiple fronts.
Its balance of power, efficiency, and durability sets it apart from other engines in its class. Let’s see what you can expect from the K24 engine’s performance on the road.
How Does the K24 Engine Perform on the Road?
The K24 engine offers a dynamic driving experience, providing a smooth and responsive performance on the road. With its high torque at low RPMs and impressive power output at higher revs, the Honda K24 ensures a balanced and enjoyable ride.
The advanced i-VTEC technology optimizes valve timing for better efficiency and power delivery, making it versatile for city driving and highway cruising. Drivers can expect quick acceleration, steady power throughout the RPM range, and a reliable engine response, making the Honda K24 a standout in its category.
Why Is It Known for Its Reliability and Power?
The K24 engine’s reputation for reliability and power stems from its robust engineering and innovative design. Honda’s meticulous attention to detail in constructing the Honda K24, including its durable aluminum block and head, contributes to its long-lasting performance.
The engine’s efficient lubrication and cooling systems further enhance its durability, reducing wear and tear over time. The high compression ratio and advanced fuel injection system provide consistent and powerful performance. Combined with Honda’s renowned quality control, these features make the K24 engine a benchmark for reliability and power in the automotive world.
Upgrading Your K24 Engine
Numerous upgrades and modifications can significantly boost performance for those looking to push the boundaries of their Honda K24 engine. Whether aiming for increased horsepower, better throttle response, or enhanced durability, the K24 offers a wide range of tuning potential. Here, we’ll expose some of the best mods and upgrades to help you get the most out of your K24 engine.
Best Mods and Upgrades to Boost Performance
Cold Air Intake — Improves airflow to the engine, increasing power and efficiency.
Performance Exhaust System — Reduces backpressure and enhances exhaust flow for better performance.
ECU Tuning — Optimizes the engine control unit for increased horsepower and torque.
High-Performance Camshafts — Increases valve lift and duration for improved power output.
Forced Induction (Turbocharger/Supercharger) — Significantly boosts horsepower and torque by forcing more air into the engine.
Upgraded Fuel Injectors — Ensures adequate fuel delivery for higher performance levels.
Aftermarket Pistons and Connecting Rods — Strengthens the engine’s bottom end to handle increased power.
Port and Polish Cylinder Head — Enhances airflow through the engine for better performance.
How to Get the Most Out of Your Honda K24
A stock Honda K24 engine is decent, but it won’t push you back into your seat when you step on the gas. Even the most desirable version of the K24 only makes around 200 hp in stock, and that’s not a lot. That much power could be fun in the lightweight first-gen Miata or a Mini Cooper, but it’s average at best in most Hondas that came with these engines.
Luckily, as we mentioned before, a lot can be done to extract more power from the Honda K24. If you want to stick to the naturally aspirated or all-motor route, you can extract anywhere from 300 to 500 hp using the right aftermarket parts!
Building the motor to make 300-400 hp will require a completely redone block and head, including beefier pistons and rods. The head must also be ported and paired with aftermarket valves and cams. Additionally, ensure that the transmission is upgraded to support the increased power output, as a stock transmission may not handle the enhanced performance.
These mods will also need to be supported with a higher-performance fueling and cooling system, among other things. 500 hp, meanwhile, will require loads of work and race-spec components and isn’t exactly a realistic target for the road. Reliable 400-500 hp builds require forced induction of some kind.
Supercharged vs Turbocharged Honda K24
While the Honda K24 engine will require supporting modification if you opt for a turbo or a supercharger, it will still be able to reward you with healthy numbers on stock internals. With a few simple mods, there are examples of K24s putting out 400-500 hp.
Both supercharging and turbocharging have their advantages and disadvantages, and choosing between them comes down to your preference. Both types of forced induction work very well with the K-series engines, and there’s plenty of information available on both builds. As far as pricing is concerned, turbocharging is certainly the easiest and most cost-efficient method.
Honda K24 – Price and Availability
Prices for almost every engine swap option other than a K-series are skyrocketing. The price for a stock K24 varies significantly, mainly depending on the engine version and the mileage.
The engine itself will cost around $2500-3000. A motor from the Acura TSX could even be priced closer to $3500. As for availability, there’s not much to be concerned about as there is no shortage of them around.
Common Issues and How to Handle Them
When was the last time you heard of an unreliable Honda engine? Exactly! They don’t exist. The Japanese company is known for its reliability, and the K24 lives up to its reputation, as does most Honda products. That being said, the Honda K24 also has weak points like every other engine in the world. Here are some known issues of the Honda K24.
Oil Leaks
Oil leaks are a common issue with the K24 engine, often caused by worn valve cover gaskets, oil pan gaskets, or the front main seal. The front main seal, also known as the front crankshaft seal, seals the front end of the crankshaft to prevent oil from leaking out of the engine.
Over time, this seal can wear down due to increased wear and tear. Although both ends of the crankshaft have seals, the front one is more prone to wear. Replacing this component after approximately 120,000 miles is advisable to avoid potential oil leaks.
Timing Chain Tensioner Issue
The timing chain in the Honda K24 engine functions similarly to a timing belt but is made of metal rather than rubber. It is linked to the crankshaft and camshaft to control valve timing. While the timing chain itself is quite durable, the tensioner can be problematic, especially if aftermarket cams are used.
The K24 generally doesn’t favor aftermarket cams, which can affect reliability. Larger cams might help you achieve power goals, but stock cams from a TSX K24A2 are usually sufficient for most performance builds. Timing chain tensioner issues typically arise from a failing spring within the tensioner, a more common problem in earlier versions of the K24.
Excessive Oil Consumption
Excessive engine oil consumption is a known issue with some Honda K24 engines. This problem often arises due to worn piston rings or valve seals, which allow oil to enter the combustion chamber and burn off.
This results in the engine using more oil than expected, leading to frequent top-offs and potential engine performance issues. Regularly monitoring oil levels and maintaining the correct engine oil viscosity can help manage this issue, but the root cause typically involves wear on these internal components.
Cooling System Problems
Cooling system issues in the Honda K24 engine, such as radiator leaks or thermostat failures, can lead to engine overheating. These problems prevent the cooling system from maintaining the optimal engine temperature, which can cause significant performance issues and potential engine damage.
VTEC System Malfunctions
The VTEC system in the K24 engine can sometimes malfunction due to issues with the VTEC solenoid or pressure switch. These malfunctions can prevent the VTEC system from engaging properly, leading to performance issues. The VTEC solenoid and pressure switch are critical components that regulate the variable valve timing and lift electronic control system, ensuring optimal engine performance.
Exhaust Camshaft Lobes Wear
Another issue the Honda K24 engine faces is exhaust camshaft lobes wearing out due to significant friction between the camshaft and the lobes, specifically those meant for the exhaust.
The K24A1 and K24A4 variants are most prone to this issue, though it remains relatively uncommon. Regular inspection and camshaft replacement can help maintain engine performance if significant wear is detected.
Tips and Tricks for Troubleshooting and Fixing Issues
To address common oil leaks, regularly check and replace gaskets, such as the valve cover gasket, oil pan gasket, and front main seal, as needed. For timing chain tensioner issues, listen for unusual noises from the engine and replace the tensioner if necessary to prevent further damage.
To manage excessive oil consumption, ensure regular oil changes with the correct oil grade and inspect the piston rings and valve seals for wear. Cooling system problems can be mitigated by routinely checking for radiator leaks and ensuring the thermostat functions correctly.
If you experience VTEC system malfunctions, inspect the VTEC solenoid and pressure switch and replace any faulty components to ensure proper system engagement.
Address exhaust camshaft lobes wear by inspecting and replacing them if significant wear is detected. Regular maintenance and timely repairs are key to keeping your K24 engine running smoothly.
Maintenance Tips for a Long-Lasting Engine
Proper maintenance is key to ensuring the longevity and performance of your Honda K24 engine. Regular upkeep helps prevent common issues and keeps your engine running smoothly for years to come.
By following essential maintenance practices, you can maximize the lifespan of your K24 and enjoy its reliable performance. Here, we’ll discuss crucial tips to keep your K24 in top shape and the maintenance practices necessary for its longevity.
Keeping Your K24 in Top Shape
Maintaining the health of your K24 engine involves routine checks and timely interventions. Regular oil changes, using the correct grade of oil, are fundamental to preserving engine components and preventing wear.
Equally important is monitoring coolant levels and ensuring the cooling system functions properly to prevent overheating. Monitoring the condition of hoses, drive belts, and belt tensioners can help avoid unexpected breakdowns. Adhering to these maintenance routines will keep your K24 running at its best.
Essential Maintenance Practices for Longevity
Regular Oil Changes — Use high-quality oil and change it every 5,000 to 7,500 miles to keep the engine lubricated and prevent wear.
Check and Replace Air Filters — Inspect the air filter every 12,000 miles and replace it if it’s dirty to ensure optimal airflow and engine efficiency.
Monitor Coolant Levels — Regularly check the coolant levels and top up as necessary. Flush the cooling system every 30,000 miles to prevent overheating.
Inspect and Replace Belts and Hoses — Examine belts and hoses for signs of wear and replace them every 60,000 to 90,000 miles to prevent failures.
Spark Plug Maintenance — Replace spark plugs every 30,000 to 60,000 miles to ensure proper combustion and engine performance.
Fuel System Cleaning — Use fuel system cleaners periodically to keep injectors clean and ensure efficient fuel delivery.
Timing Chain Inspection — To avoid serious engine damage, regularly inspect the timing chain and tensioner for wear and replace them as needed.
Regular Inspections — Conduct thorough engine inspections periodically to catch potential issues early and maintain optimal performance.
By adhering to these essential maintenance practices, you can significantly extend the life of your K24 engine and maintain its performance and reliability over the long haul.
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