Honda Accord K24Z3 2.4L L4 Engine 12487E 2008-2012

Description

Exhaust camshaft lobe micro-pitting and oil control ring carbon packing cause unburned oil smoke and power loss in midsize sedans. The Honda Accord K24Z3 Engine resolves these valvetrain and oil control failure points during commercial long block repower procedures. Delivering 190HP, this 2.4L 4-Cylinder assembly requires verified subframe dowel pin alignment to avoid transaxle input spline damage.

High density ASTM A356-T6 cast aluminum forms the deep-skirt crankcase, equipped with cast-in iron liners to control cylinder bore deflection. This Honda engine core features an induction-hardened forged steel crankshaft stamped R40 paired with tri-metal bearings and stellite exhaust valves. Starter draw pulls 145A at 12V during cold crank tests. Dry weight equals 210 lbs with proportions of 38in length, 38in width, 38in height, with a 4.4 quarts oil capacity.

Key Features of Honda K24Z3

Fleet facilities buy Honda K24Z3 commercial long block engines to eliminate persistent valvetrain wear during industrial engine rebuild projects. Computer controlled line honing ensures exact main bearing journal roundness to maintain consistent hydrodynamic oil films under high RPM operation.

• Left bellhousing stamped K24Z3 and cast RL5 verifies authentic high output casting origin.
• High compression DOHC 16-Valve cylinder head optimizes intake runner velocity for top-end power.
• Upgraded variable timing control actuator eliminates cold startup gear rattle and timing drift.
• Hardened crankshaft marked R40 provides high torsional stiffness under full throttle acceleration.
• The K24Z3 commercial core utilizes low friction piston coatings to prevent cold bore scuffing.
• Chain driven oil pump maintains positive pressure to the variable valve timing system.
• Multi layer steel head gaskets eliminate combustion gas leakage across cylinder decks.
• Premium Viton valve stem seals eliminate oil suction into intake ports during deceleration.

Dynamometer Performance Test Parameters

Dynamometer bench runs certify 190HP at 7000 RPM and 162 ft-lbs torque at 4400 RPM under continuous testing schedules. Lubrication gallery operating pressure holds 55 PSI at an oil sump temp of 195°F. Cylinder compression maintains 190 PSI across all four cylinders with variance restricted below 4%. Crankshaft main journal runout checks show less than 0.0003in TIR across all bearing locations. This K24Z3 long block engine maintains continuous exhaust gas temp readouts below 1320°F during simulated maximum load road evaluations.

Chassis Fitment Application Matrix

Direct bolt-in fitment matches 2008 to 2012 Honda Accord EX and EX-L sedan and coupe models across eighth generation CP2 and CS1 chassis platforms. This long block mates direct to factory 5-speed automatic transmissions or 6-speed manual gearboxes, utilizing original factory motor mount brackets and dual exhaust manifold connections without fabrication.

Installation Protocols Maintenance Schedule

Drive by wire throttle controls require clean electrical grounds with under 0.2 ohms resistance to preserve idle stability. Technicians must note this high output engine is NOT engineered for base K24Z2 Accord LX models, CR-V K24Z6 platforms, or Civic Si applications due to specific intake runner volumes, exhaust port spacing, and engine control unit maps.

• Drain initial break-in engine oil and replace filter after 500 road miles or 20 hours.
• Check cold valve lash to 0.009in intake and 0.011in exhaust during initial valvetrain setup.
• Clean the cylinder head variable timing solenoid screen during every second scheduled oil change.

Warranty Verification Crate Manifest

Supported by a comprehensive 3-Year 100,000-mile parts warranty, this rebuild fulfills every rigorous Honda assembly standard specification. The heavy duty wooden shipping crate contains the long block core, cast aluminum oil pan, front timing cover, valve cover, oil pickup tube, and signed dynamometer test documentation.