What Is the Best K24 Engine? K24A vs K24A2 vs K24Z Ranked

TL;DR: What is the best K24 engine? The K24A2 from the Acura TSX is the top pick. It has VTEC on both cams, a higher compression ratio, and around 200 horsepower stock. The K24A1 is the better choice if you want a reliable daily driver instead of a tuner build. The K24Z and K24W are newer options worth knowing about, too. Keep reading for the full breakdown and a comparison table.

So, what is the best K24 engine? If you ask ten Honda owners, most will say the K24A2. It comes from the Acura TSX. This engine has VTEC on both the intake and exhaust cams. It also has a higher compression ratio than the other K24 variants. That combo gives it more power right out of the box.

But the K24A2 is not the only good option. Honda built several K24 variants between 2002 and today. Each one was made for a different car and a different job. Some focus on reliability. Others focus on power. The right choice depends on what you plan to do with it.

This guide ranks the main K24 variants. We cover specs, horsepower, and what each engine is best for. We also help you decide which K24 is best for your swap or your daily driver.

How We Ranked the K24 Variants

We looked at four things for each engine. These are stock horsepower, compression ratio, VTEC setup, and parts availability.

Higher compression and dual VTEC mean more power without modifications. Better parts availability means an easier swap and cheaper repairs. We also looked at real owner reports on long-term reliability.

Our techs at JDM State Motors compression test every used K24 before it gets listed. This gives us a good view of how each variant holds up after 150,000 or more miles. That hands-on experience shaped this ranking as much as the spec sheets did.

K24A2 (Acura TSX): The Enthusiast Favorite

The K24A2 is the engine most people mean when they ask which K24 engine is the best. It was used in the Acura TSX and the Honda Accord Euro R. Honda also used a closely related version in some JDM Accords from that era.

This engine has a 10.5 to 1 compression ratio. That is higher than most other K24 variants. It also runs i-VTEC on both the intake and exhaust camshafts. Most other K24s only have VTEC on the intake side.

Stock output sits between 197 and 205 horsepower. Torque runs from 164 to 171 lb ft. The exact number depends on the model year. Later, TSX models got a bigger intake duct and a larger throttle body. Those changes pushed peak power closer to the 205 hp mark.

The K24A2 also responds well to basic upgrades. A simple intake, exhaust, and ECU tune can push output into the 230 hp range. This is why builders treat it as the gold standard for naturally aspirated K24 builds.

If you are shopping for an engine close to this spec, check out this 2003 to 2007 Honda Accord K24A engine. It comes from the same era and shares many of the same upgraded internals.

K24A1 / K24A: The Reliable Daily

The K24A1 is the original K24. Honda put it in the 2002 to 2006 CR-V and the Honda Element. It is not built for speed. It is built to last.

This engine makes about 160 horsepower and 161 to 162 lb ft of torque. That is well below the K24A2. The compression ratio is also lower. VTEC only works on the intake cam, not both.

What the K24A1 lacks in power, it makes up for in reliability. Owners regularly report 200,000 to 300,000 miles with normal maintenance. The internals are simple and proven. Parts are cheap and easy to find.

This makes the K24A1 a smart pick for a daily driver. It also works well as a budget swap base. Many builders use the A1 block with a K20 head to balance low-end torque with high rev performance.

K-series engines have a strong reputation for long-term durability across the board, and the K24A1 is a clear example of that reputation in action.

Looking for a unit in this family? This 2010 to 2014 Honda CR-V K24A engine is a solid match if reliability is your main goal.

K24Z & K24W: What to Know

Honda kept updating the K24 after the A1 and A2. The K24Z series came next. It showed up in later Accord models and some Acura TSX trims.

The K24Z3 makes between 190 and 201 horsepower. Torque sits around 162 to 172 lb ft. Compression is close to the K24A2. The downside is less aftermarket support. Fewer builders use this variant, so finding bolt-on parts can take more effort.

The K24W came after that. Honda calls it the Earth Dreams engine. It uses a lighter cylinder block and a redesigned head. The intake and exhaust ports were flipped compared to older K24s. Compression jumped to 11.1 to 1, and the engine added direct fuel injection.

The K24W was built for fuel economy and daily use, not for swaps. It is a good option if you want a modern, efficient engine for a daily driver. It is not the first choice for a performance build.

If you are after a newer Accord platform engine, this 2009 to 2012 Honda Accord K24A engine fits that need well.

Best K24 for a Swap vs a Daily Driver

The K24A vs K24A2 question comes down to your goal. If you want the strongest base for a performance swap, go with the K24A2. It has the best stock specs and the most aftermarket support. Builders trust it for both naturally aspirated and light turbo setups.

If you just want a reliable engine for daily driving, the K24A1 makes more sense. It costs less, parts are easier to find, and it holds up well over high mileage. You give up some power, but you gain peace of mind.

The K24Z and K24W sit in between. They offer decent power and modern features, but you will pay more and find fewer aftermarket options. These work best if you already own a car that came with one and you want a low-mileage replacement.

Whatever you choose, check the full lineup of Honda engines we have in stock. Every unit goes through a compression test before it gets listed.

K24 Comparison Table

Frequently Asked Questions

What is the best K24 engine?

The K24A2 from the Acura TSX is the best overall K24 engine. It has higher compression, dual VTEC, and stronger stock power than other variants. It is also the most supported engine for performance builds.

Is the K24A2 the best K24?

Yes, for most builders, the K24A2 is the top choice. It produces around 200 horsepower stock and responds well to basic upgrades. The only downside is a higher price due to demand.

What's the difference between the K24A1 and K24A2?

The K24A1 has VTEC only on the intake cam and makes about 160 horsepower. The K24A2 has VTEC on both cams, higher compression, and makes up to 205 horsepower. The A2 is built for performance, while the A1 is built for reliability.

Which K24 is best for an engine swap?

The K24A2 is the top pick for a performance swap because of its higher compression and stronger internals. The K24A1 works well for a budget-friendly swap, especially when paired with a K20 head. Reach out through our contact page if you need help confirming fitment for your build.

Is the K24Z reliable?

Yes, the K24Z series is reliable and shares most of its core design with earlier K24 engines. It does have less aftermarket support, so plan on fewer bolt-on options if you plan to modify it.

Find Your K24 Engine

Every K24 has a job it does well. The K24A2 wins for performance. The K24A1 wins for reliability. The K24Z and K24W fit newer Accords that need a low-mileage replacement.

JDM State Motors of NC is a registered North Carolina company based in Garner, NC. We ship low-mileage, compression-tested K24 engines across the United States. Browse our current Honda engine inventory or contact our team for help matching the right K24 to your car.