When it comes to Honda’s four-cylinder engines, the K series is often hailed as the best. With its potential for natural aspiration and turbocharged builds, it has become a popular choice for enthusiasts looking to upgrade their older Honda chassis. However, there seems to be a debate among Honda fans regarding whether the K20 or the K24 is the superior engine. In this article, we will delve into the differences between the K20 and K24 engines, exploring their characteristics, applications, and performance to determine which one comes out on top.
Introduction to the Honda K Series
The Honda K Series was introduced in 2001 as a replacement for the aging B Series. Initially, there were reservations about whether the K Series would live up to the performance standards set by its predecessor, but it quickly proved its worth and gained popularity in both stock and aftermarket applications. The K Series made its debut in the US in the 2002 Acura RSX and Civic Si, featuring several changes that set it apart from other Honda four-cylinder engines. Notable differences include a direct fire ignition system and a reverse layout with clockwise rotation. However, one of the most significant distinctions is the placement of the intake manifold. Unlike the B Series, where the intake manifold is located at the back of the head, the K Series has it at the front.
K20 vs K24: The Displacement Battle
The most apparent disparity between the K20 and K24 engines is their displacement. The K20 comes with a 2.0-liter capacity, while the K24 boasts a larger 2.4 liters. The nomenclature itself reveals this, as the numbers 20 and 24 represent the displacement in cubic centimeters (CC). The K20 achieves its 2.0-liter displacement through a square design with an 86mm bore and stroke. To attain the additional 400CCs of displacement for the K24, Honda increased the bore to 87mm and the stroke to 99mm. This longer stroke gives the K24 an advantage in low-end torque, although it sacrifices some of the high-end power found in the K20 due to a lower redline. Accommodating the taller deck height required by the K24’s longer stroke resulted in a slightly heavier engine. However, the weight difference between the K20 and K24 is minimal, totaling around 10 to 15 pounds.
Application Differences
When it comes to application, there is a clear distinction between the K20 and K24 engines. The K20 is predominantly found in smaller vehicles such as the Civic, Integra, RSX, Accord, and CRV. On the other hand, the K24 is commonly utilized in larger vehicles like the CRV, Accord, Odyssey, TSX, and Element. The increased torque offered by the K24 makes it particularly suitable for larger vehicles, where more power is necessary to push the additional weight.
Performance and Components
Both the K20 and K24 engines use Honda’s i-VTEC system, which is available in both performance and economy versions. While the heads of the K20 and K24 are similar, with most differences found in the camshafts, there are variations in other components such as throttle bodies, intake manifolds, exhaust manifolds, and ECUs. However, these variations are relatively minor, and for the most part, all K20 engines share similarities, as do all K24 engines.
Swapping Capabilities and Cost Considerations
One of the primary reasons the K Series engines are highly regarded is their compatibility with older Honda chassis, such as the EG and EK. Compared to the K24, the K20 is generally more affordable to purchase and swap into a different chassis. However, if cost is not a significant concern, the K24 can still be an economical option if done correctly. A popular swap setup involves using a K24 bottom end with a K20 head. This combination offers the best of both worlds: the increased low-end torque of the K24 and the performance capabilities of the K20 head. Swapping in a K24 with a performance version of i-VTEC, such as the K20A2 from the TSX, is another option. However, finding this particular engine can be challenging and expensive. Additionally, compatibility issues with throttle by wire and non-compatible ECUs may arise. To address these concerns, one can use an intake manifold and throttle body from an RSX Type-S or a Civic Si, along with a plug for the EGR port on the TSX head. Alternatively, taking a K24 from an Element, Accord, or CRV and pairing it with a K20A2 head provides a cost-effective solution that remedies the aforementioned problems.
Conclusion: Which is Better, K20 or K24?
Ultimately, whether the K20 or K24 is the superior engine boils down to cost considerations. If budget plays a significant role, the K20 is a more economical choice due to its lower price and wider availability. However, the K24 offers increased low-end torque and overall superior performance potential with its larger displacement. With an additional 400CCs, the K24 delivers exceptional power, making it ideal for larger vehicles. It is worth noting that both engines are excellently suited for naturally aspirated and boosted applications. For maximum power, combining a K24 bottom end with a K20 head provides an optimal solution. The K20 offers ample power for lightweight vehicles, offering excellent performance for street use. On the other hand, the K24 shines when it comes to low-end torque and outstanding overall performance.
In conclusion, both the K20 and K24 are exceptional engines in their own right, each best suited to different circumstances. The choice between them ultimately depends on individual preferences, budget constraints, and intended applications.
Let us know in the comments which engine you think is better, the K20 or the K24. Don’t forget to like this article and subscribe to our channel for more exciting content. Stay tuned for the next video!
