Honda K24 Engine 2.4L i-VTEC
The Honda K24 is a 2.4-liter, DOHC inline-4 engine introduced in 2002, prized for its exceptional torque output compared to the smaller K20. Featuring Honda's i-VTEC system (Variable Valve Timing and Lift Electronic Control) and all-aluminum construction with cast iron sleeves, the K24 has become the preferred foundation for high-performance "K-swap" builds, offering superior low-end and mid-range torque for street-driven and track-ready vehicles.
Parameter | Value |
|---|---|
Engine Code | K24 (various: K24A, K24A2, K24Z, K24Y, K24W, K24C, etc.) |
Configuration | Inline-4 (Straight 4) |
Displacement | 2,354 cc (2.4L) |
Bore x Stroke | 87 mm x 99 mm (Undersquare / Long-stroke design) |
Cylinder Block Material | Aluminum with cast iron sleeves |
Cylinder Head Material | Aluminum |
Valvetrain | DOHC, 4 valves per cylinder, with i-VTEC (VTC on intake cam) |
Compression Ratio | 9.6:1 – 11.0:1 (depending on variant) |
Fuel System | Programmed Fuel Injection (PGM-FI) |
Ignition System | Coil-on-plug (distributorless) |
Engine Weight (Dry) | 125-130 kg (275-287 lbs) without gearbox |
Redline | 6,500 – 7,400 RPM (depending on variant) |
Variant | Application | Power | Torque | Redline |
|---|---|---|---|---|
K24A (JDM) | Accord Euro R (CL9) | 200 hp @ 6,800 rpm | 171 lb-ft @ 4,500 rpm | 7,400 rpm |
K24A2 (USDM) | Acura TSX (2004-2008) | 200 hp @ 6,800 rpm | 166 lb-ft @ 4,500 rpm | 7,400 rpm |
K24A8 | Honda Accord (2006-2007) | 166 hp @ 5,800 rpm | 161 lb-ft @ 4,000 rpm | 6,800 rpm |
K24Z3 | Honda Accord (2008-2012) | 177 hp @ 6,500 rpm | 161 lb-ft @ 4,500 rpm | 7,000 rpm |
K24Z7 | Honda Civic Si (2012-2015) / CR-Z (K24 swapped) | 201 hp @ 7,000 rpm | 170 lb-ft @ 4,400 rpm | 7,200 rpm |
K24W7 | Acura TLX (2015-2020) | 206 hp @ 6,800 rpm | 182 lb-ft @ 4,500 rpm | 6,800 rpm |
K24C2 | Honda Civic EX-L (2016-2021) | 174 hp @ 6,500 rpm | 162 lb-ft @ 4,700 rpm | 6,800 rpm |
Long-Stroke Design (99mm stroke): Provides superior low-end and mid-range torque compared to the K20, ideal for street driving, autocross, and daily-driven performance cars.
i-VTEC System: Variable Timing Control (VTC) on intake cam continuously adjusts camshaft phasing, while VTEC switches cam profiles for optimal power and efficiency across the RPM range.
Dual i-VTEC (K24A/K24A2/K24Z7 only): VTEC operates on intake valves only (not exhaust, unlike K20 performance variants) – known as "RBB" or "K24A2" head design.
All-Aluminum Construction: Lightweight engine block with cast iron cylinder liners provides excellent strength-to-weight ratio and rebuildability.
Coil-on-Plug Ignition: Distributorless system allows ECU to control individual coil timing for precise spark management.
Roller Rocker Arms: Reduces valvetrain friction and improves reliability at high RPM.
Chain-Driven Timing: Maintenance-free timing chain (no belt replacement required).
"Frankestein" / "K24/K20 Hybrid" Ready: K24 block mates to K20 cylinder heads for high-torque, high-RPM hybrid builds (K20 head + K24 block = high compression, high flow).
Variant | Donor Vehicle | Key Notes |
|---|---|---|
K24A (JDM) | Accord Euro R (CL9) | Highest performance NA K24. RBB intake manifold. Dual i-VTEC (intake only). |
K24A2 (USDM) | Acura TSX (2004-2008) | RBB or RBC intake manifold. Most popular K24 for swaps. |
K24Z3 | Honda Accord (2008-2012) | Z-series head (integrated exhaust manifold). Less desirable for performance builds. |
K24Z7 | Honda Civic Si (2012-2015) | Z7 head. 201 hp factory. |
K24W7 | Acura TLX (2015-2020) | Earth Dreams technology. Direct injection. |
K24A8 | Honda Accord (2006-2007) | Economy-focused. Lower redline. |
K24Y1 | Honda CR-V (2012-2016) | Common donor for affordable K-swaps. |
1x Honda K24 Longblock (Cylinder head + engine block)
1x Intake Manifold with Throttle Body (RBB, RBC, Z7, or Z3 depending on variant)
1x Exhaust Manifold (4-2-1 or integrated 4-1 depending on variant)
1x Wiring Harness (if included – specify donor vehicle)
Injectors, ignition coils, alternator, starter, and ECU.