The direct-injected 2.4-liter DOHC i-VTEC 4-cylinder engine that powers the Accord LX, EX and EX-L Sedan, and the LX-S, EX and EX-L Coupe produces 185 horsepower and 181 lb-ft. of torque. This Honda Earth Dreams® Technology engine features a set of next-generation technological advancements, which greatly enhance both driving performance and fuel efficiency.
The engine's direct injection (DI) system and other technologies combine to create a robust torque output, with significant power available over a wide operating range. This clean-running engine meets LEV3-SULEV30 (California) emissions standards in select states, and Federal Tier3-Bin30 standards in most states.
Engine Block, Crankshaft and Pistons
The Accord's 2.4-liter engine features a lightweight die-cast aluminum block with a single main-bearing cradle design that creates a rigid assembly to help minimize noise and vibration. Cast-in iron cylinder liners provide long-lasting durability. Each journal on the forged-steel crankshaft is micropolished to reduce internal friction. To improve smoothness throughout the rpm range and help lower noise levels, the Accord is fitted with an internal balancer unit. Consisting of a pair of chain-driven counter-rotating shafts located in the oil pan, the balancing system helps quell the inherent second-order harmonic vibrations that normally impact inline 4-cylinder engines.
To reduce piston-sliding friction, the cylinder bores are offset by 8.0-mm from the crankshaft. This gives the connecting rods a more favorable angle during each power stroke, which reduces side loading on the pistons and in turn, improves efficiency. The direct-injected engine features a forged crankshaft for high rigidity and low friction. With increased diameter of the counterweights, the crankshaft offers optimized flywheel effect, while minimizing the total weight.
Lightweight pistons have a carefully optimized skirt design to minimize reciprocating mass, and reduced weight minimizes vibration and increases operating efficiency. The piston crowns are dished, to help maintain stable combustion and to optimize distribution of the stratified fuel charge from the direct injector in each cylinder. This close control over the combustion process boosts overall operating efficiency.
For packaging efficiency the direct-injected engine is positioned with a 10-degree rearward slant to accommodate the forward exhaust layout.