[stevej37]

[QUOTE=aigel;11467471]
Do the engines have timingbelts? That's another fail in my book.


The Civic's 2.0-liter 4-cylinder engine has a lightweight DOHC cylinder head that is made of low-pressure cast aluminum alloy. With exhaust passages cast directly into the cylinder head, the need for a traditional separate exhaust manifold is eliminated and the catalytic converter mounts directly to the cylinder head.

A low-friction silent-chain drives dual overhead cams and four valves per cylinder. The cam drive is maintenance free throughout the life of the engine. To assist cooling and detonation resistance, the cylinder head has a cooling passage placed between each pair of exhaust valves.

The combustion chamber shape and valve angles are optimized to help boost fuel efficiency and power. The included valve angle is 35 degrees, to decrease the surface-to-volume ratio of the combustion chambers and help create a flat, compact combustion chamber that minimizes unburned hydrocarbon emissions. The combustion chamber shape creates a compression ratio of 10.8:1, yet the engine still operates on regular unleaded fuel.

The cylinder head features a high-tumble intake-port design. In combination with the combustion chamber and piston crown shape, the design's high level of airflow tumble helps create a homogenous fuel mixture for low fuel consumption and high airflow for high power output.

The Civic's 2.0-liter DOHC 16-valve i-VTEC® engine uses an advanced valve control system to combine high power output with high fuel efficiency and low emissions. The system combines dual VTC™ (Variable Timing Control™), which continuously adjusts the intake and exhaust camshaft phase, with Variable Valve Timing and Lift Electronic Control (VTEC®), which changes valve lift, timing and duration of the intake valve opening.

The "intelligent" portion of the system is its ability to continuously vary the timing of the intake and exhaust camshafts using variable valve timing control (VTC™). This helps increase power and provides a smoother idle (allowing idle speed to be reduced). The cam timing is varied based on input from sensors that monitor rpm, timing, throttle opening, cam position and exhaust air-fuel ratio. The result is increased fuel efficiency and lower emissions. Under certain conditions, the VTC™ can hold the intake valves open longer to allow a reverse airflow of intake air into the intake manifold.